synapsecns/sanguine

{"/solidity/FiatToken.sol:AbstractFiatTokenV1":{"code":"0x","runtime-code":"0x","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"","srcMapRuntime":"","abiDefinition":[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"kind":"dev","methods":{"allowance(address,address)":{"details":"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called."},"approve(address,uint256)":{"details":"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event."},"balanceOf(address)":{"details":"Returns the amount of tokens owned by `account`."},"totalSupply()":{"details":"Returns the amount of tokens in existence."},"transfer(address,uint256)":{"details":"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."},"transferFrom(address,address,uint256)":{"details":"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."}},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"details\":\"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called.\"},\"approve(address,uint256)\":{\"details\":\"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event.\"},\"balanceOf(address)\":{\"details\":\"Returns the amount of tokens owned by `account`.\"},\"totalSupply()\":{\"details\":\"Returns the amount of tokens in existence.\"},\"transfer(address,uint256)\":{\"details\":\"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"},\"transferFrom(address,address,uint256)\":{\"details\":\"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"AbstractFiatTokenV1\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","balanceOf(address)":"70a08231","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd"}},"/solidity/FiatToken.sol:AbstractFiatTokenV2":{"code":"0x","runtime-code":"0x","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"","srcMapRuntime":"","abiDefinition":[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"kind":"dev","methods":{"allowance(address,address)":{"details":"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called."},"approve(address,uint256)":{"details":"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event."},"balanceOf(address)":{"details":"Returns the amount of tokens owned by `account`."},"totalSupply()":{"details":"Returns the amount of tokens in existence."},"transfer(address,uint256)":{"details":"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."},"transferFrom(address,address,uint256)":{"details":"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."}},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"details\":\"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called.\"},\"approve(address,uint256)\":{\"details\":\"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event.\"},\"balanceOf(address)\":{\"details\":\"Returns the amount of tokens owned by `account`.\"},\"totalSupply()\":{\"details\":\"Returns the amount of tokens in existence.\"},\"transfer(address,uint256)\":{\"details\":\"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"},\"transferFrom(address,address,uint256)\":{\"details\":\"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"AbstractFiatTokenV2\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","balanceOf(address)":"70a08231","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd"}},"/solidity/FiatToken.sol:Address":{"code":"0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122067083bad7cfcce2ce9d91d79e7cfa0c71ed93ee0306d08156dd014e9a0e518fc64736f6c634300060c0033","runtime-code":"0x73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122067083bad7cfcce2ce9d91d79e7cfa0c71ed93ee0306d08156dd014e9a0e518fc64736f6c634300060c0033","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"31638:6530:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;","srcMapRuntime":"31638:6530:0:-:0;;;;;;;;","abiDefinition":[],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"details":"Collection of functions related to the address type","kind":"dev","methods":{},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"Collection of functions related to the address type\",\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"Address\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{}},"/solidity/FiatToken.sol:Blacklistable":{"code":"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","runtime-code":"0x608060405234801561001057600080fd5b506004361061007d5760003560e01c8063bd1024301161005b578063bd1024301461011b578063f2fde38b14610123578063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File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"17834:1967:0:-:0;;;;;;;;;;;;-1:-1:-1;12217:20:0;12226:10;12217:8;:20::i;:::-;17834:1967;;12501:81;12557:6;:17;;-1:-1:-1;;;;;;12557:17:0;-1:-1:-1;;;;;12557:17:0;;;;;;;;;;12501:81::o;17834:1967::-;;;;;;;","srcMapRuntime":"17834:1967:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;19333:151;;;;;;;;;;;;;;;;-1:-1:-1;19333:151:0;;;;:::i;:::-;;12356:81;;;:::i;:::-;;;;;;;;;;;;;;;;;;;19492:306;;;;;;;;;;;;;;;;-1:-1:-1;19492:306:0;;;;:::i;17875:26::-;;;:::i;12969:276::-;;;;;;;;;;;;;;;;-1:-1:-1;12969:276:0;;;;:::i;19052:146::-;;;;;;;;;;;;;;;;-1:-1:-1;19052:146:0;;;;:::i;18821:117::-;;;;;;;;;;;;;;;;-1:-1:-1;18821:117:0;;;;:::i;:::-;;;;;;;;;;;;;;;;;;19333:151;18293:11;;;;18279:10;:25;18257:119;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;19408:21:::1;::::0;::::1;19432:5;19408:21:::0;;;:11:::1;:21;::::0;;;;;:29;;;::::1;::::0;;19453:23;::::1;::::0;19432:5;19453:23:::1;19333:151:::0;:::o;12356:81::-;12396:7;12423:6;;;12356:81;:::o;19492:306::-;12729:6;;;;12715:10;:20;12707:65;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;19596:29:::1;::::0;::::1;19574:129;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;19714:11;:29:::0;;;::::1;;::::0;;::::1;::::0;;;::::1;::::0;;;;19759:31:::1;::::0;19778:11;::::1;::::0;19759:31:::1;::::0;-1:-1:-1;;19759:31:0::1;19492:306:::0;:::o;17875:26::-;;;;;;:::o;12969:276::-;12729:6;;;;12715:10;:20;12707:65;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;13066:22:::1;::::0;::::1;13044:110;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;13191:6;::::0;13170:38:::1;::::0;;13191:6:::1;::::0;;::::1;13170:38:::0;;;;::::1;;::::0;::::1;::::0;;;::::1;::::0;;;;;;;;::::1;13219:18;13228:8;13219;:18::i;:::-;12969:276:::0;:::o;19052:146::-;18293:11;;;;18279:10;:25;18257:119;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;19125:21:::1;::::0;::::1;;::::0;;;:11:::1;:21;::::0;;;;;:28;;;::::1;19149:4;19125:28;::::0;;19169:21;::::1;::::0;19125;19169::::1;19052:146:::0;:::o;18821:117::-;18909:21;;18885:4;18909:21;;;:11;:21;;;;;;;;;18821:117::o;12501:81::-;12557:6;:17;;;;;;;;;;;;;;;12501:81::o","abiDefinition":[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_account","type":"address"}],"name":"Blacklisted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newBlacklister","type":"address"}],"name":"BlacklisterChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_account","type":"address"}],"name":"UnBlacklisted","type":"event"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"blacklist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"blacklister","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"isBlacklisted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"unBlacklist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newBlacklister","type":"address"}],"name":"updateBlacklister","outputs":[],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"details":"Allows accounts to be blacklisted by a \"blacklister\" role","kind":"dev","methods":{"blacklist(address)":{"details":"Adds account to blacklist","params":{"_account":"The address to blacklist"}},"isBlacklisted(address)":{"details":"Checks if account is blacklisted","params":{"_account":"The address to check"}},"owner()":{"details":"Tells the address of the owner","returns":{"_0":"the address of the owner"}},"transferOwnership(address)":{"details":"Allows the current owner to transfer control of the contract to a newOwner.","params":{"newOwner":"The address to transfer ownership to."}},"unBlacklist(address)":{"details":"Removes account from blacklist","params":{"_account":"The address to remove from the blacklist"}}},"title":"Blacklistable Token","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"Blacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"}],\"name\":\"BlacklisterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"UnBlacklisted\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"blacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"blacklister\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"isBlacklisted\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"unBlacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newBlacklister\",\"type\":\"address\"}],\"name\":\"updateBlacklister\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"Allows accounts to be blacklisted by a \\\"blacklister\\\" role\",\"kind\":\"dev\",\"methods\":{\"blacklist(address)\":{\"details\":\"Adds account to blacklist\",\"params\":{\"_account\":\"The address to blacklist\"}},\"isBlacklisted(address)\":{\"details\":\"Checks if account is blacklisted\",\"params\":{\"_account\":\"The address to check\"}},\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}},\"unBlacklist(address)\":{\"details\":\"Removes account from blacklist\",\"params\":{\"_account\":\"The address to remove from the blacklist\"}}},\"title\":\"Blacklistable Token\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"Blacklistable\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"blacklist(address)":"f9f92be4","blacklister()":"bd102430","isBlacklisted(address)":"fe575a87","owner()":"8da5cb5b","transferOwnership(address)":"f2fde38b","unBlacklist(address)":"1a895266","updateBlacklister(address)":"ad38bf22"}},"/solidity/FiatToken.sol:ECRecover":{"code":"0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122077368e92d18f9c88b8911c75e3580c074e6b279d5f147242aa26864a0cab8aa864736f6c634300060c0033","runtime-code":"0x73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122077368e92d18f9c88b8911c75e3580c074e6b279d5f147242aa26864a0cab8aa864736f6c634300060c0033","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"49430:2154:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;","srcMapRuntime":"49430:2154:0:-:0;;;;;;;;","abiDefinition":[],"userDoc":{"kind":"user","methods":{},"notice":"A library that provides a safe ECDSA recovery function","version":1},"developerDoc":{"kind":"dev","methods":{},"title":"ECRecover","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"title\":\"ECRecover\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"notice\":\"A library that provides a safe ECDSA recovery function\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"ECRecover\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{}},"/solidity/FiatToken.sol:EIP2612":{"code":"0x","runtime-code":"0x","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"","srcMapRuntime":"","abiDefinition":[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{"nonces(address)":{"notice":"Nonces for permit"}},"notice":"Provide internal implementation for gas-abstracted approvals","version":1},"developerDoc":{"kind":"dev","methods":{"allowance(address,address)":{"details":"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called."},"approve(address,uint256)":{"details":"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event."},"balanceOf(address)":{"details":"Returns the amount of tokens owned by `account`."},"nonces(address)":{"params":{"owner":"Token owner's address (Authorizer)"},"returns":{"_0":"Next nonce"}},"totalSupply()":{"details":"Returns the amount of tokens in existence."},"transfer(address,uint256)":{"details":"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."},"transferFrom(address,address,uint256)":{"details":"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."}},"title":"EIP-2612","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"DOMAIN_SEPARATOR\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"PERMIT_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"name\":\"nonces\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"details\":\"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called.\"},\"approve(address,uint256)\":{\"details\":\"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event.\"},\"balanceOf(address)\":{\"details\":\"Returns the amount of tokens owned by `account`.\"},\"nonces(address)\":{\"params\":{\"owner\":\"Token owner's address (Authorizer)\"},\"returns\":{\"_0\":\"Next nonce\"}},\"totalSupply()\":{\"details\":\"Returns the amount of tokens in existence.\"},\"transfer(address,uint256)\":{\"details\":\"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"},\"transferFrom(address,address,uint256)\":{\"details\":\"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"}},\"title\":\"EIP-2612\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{\"nonces(address)\":{\"notice\":\"Nonces for permit\"}},\"notice\":\"Provide internal implementation for gas-abstracted approvals\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"EIP2612\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"DOMAIN_SEPARATOR()":"3644e515","PERMIT_TYPEHASH()":"30adf81f","allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","balanceOf(address)":"70a08231","nonces(address)":"7ecebe00","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd"}},"/solidity/FiatToken.sol:EIP3009":{"code":"0x","runtime-code":"0x","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"","srcMapRuntime":"","abiDefinition":[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"authorizer","type":"address"},{"indexed":true,"internalType":"bytes32","name":"nonce","type":"bytes32"}],"name":"AuthorizationCanceled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"authorizer","type":"address"},{"indexed":true,"internalType":"bytes32","name":"nonce","type":"bytes32"}],"name":"AuthorizationUsed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"CANCEL_AUTHORIZATION_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"RECEIVE_WITH_AUTHORIZATION_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TRANSFER_WITH_AUTHORIZATION_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"authorizer","type":"address"},{"internalType":"bytes32","name":"nonce","type":"bytes32"}],"name":"authorizationState","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{"authorizationState(address,bytes32)":{"notice":"Returns the state of an authorization"}},"notice":"Provide internal implementation for gas-abstracted transfers","version":1},"developerDoc":{"details":"Contracts that inherit from this must wrap these with publicly accessible functions, optionally adding modifiers where necessary","kind":"dev","methods":{"allowance(address,address)":{"details":"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called."},"approve(address,uint256)":{"details":"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event."},"authorizationState(address,bytes32)":{"details":"Nonces are randomly generated 32-byte data unique to the authorizer's address","params":{"authorizer":"Authorizer's address","nonce":"Nonce of the authorization"},"returns":{"_0":"True if the nonce is used"}},"balanceOf(address)":{"details":"Returns the amount of tokens owned by `account`."},"totalSupply()":{"details":"Returns the amount of tokens in existence."},"transfer(address,uint256)":{"details":"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."},"transferFrom(address,address,uint256)":{"details":"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."}},"stateVariables":{"_authorizationStates":{"details":"authorizer address =\u003e nonce =\u003e bool (true if nonce is used)"}},"title":"EIP-3009","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"AuthorizationCanceled\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"AuthorizationUsed\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"CANCEL_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"DOMAIN_SEPARATOR\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RECEIVE_WITH_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"TRANSFER_WITH_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"authorizationState\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"Contracts that inherit from this must wrap these with publicly accessible functions, optionally adding modifiers where necessary\",\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"details\":\"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called.\"},\"approve(address,uint256)\":{\"details\":\"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event.\"},\"authorizationState(address,bytes32)\":{\"details\":\"Nonces are randomly generated 32-byte data unique to the authorizer's address\",\"params\":{\"authorizer\":\"Authorizer's address\",\"nonce\":\"Nonce of the authorization\"},\"returns\":{\"_0\":\"True if the nonce is used\"}},\"balanceOf(address)\":{\"details\":\"Returns the amount of tokens owned by `account`.\"},\"totalSupply()\":{\"details\":\"Returns the amount of tokens in existence.\"},\"transfer(address,uint256)\":{\"details\":\"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"},\"transferFrom(address,address,uint256)\":{\"details\":\"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"}},\"stateVariables\":{\"_authorizationStates\":{\"details\":\"authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\"}},\"title\":\"EIP-3009\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{\"authorizationState(address,bytes32)\":{\"notice\":\"Returns the state of an authorization\"}},\"notice\":\"Provide internal implementation for gas-abstracted transfers\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"EIP3009\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"CANCEL_AUTHORIZATION_TYPEHASH()":"d9169487","DOMAIN_SEPARATOR()":"3644e515","RECEIVE_WITH_AUTHORIZATION_TYPEHASH()":"7f2eecc3","TRANSFER_WITH_AUTHORIZATION_TYPEHASH()":"a0cc6a68","allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","authorizationState(address,bytes32)":"e94a0102","balanceOf(address)":"70a08231","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd"}},"/solidity/FiatToken.sol:EIP712":{"code":"0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea26469706673582212205cfa1d6596e9c667f5703b23f248625f83d82ffe9c05dcf19455daf6f0693c5c64736f6c634300060c0033","runtime-code":"0x73000000000000000000000000000000000000000030146080604052600080fdfea26469706673582212205cfa1d6596e9c667f5703b23f248625f83d82ffe9c05dcf19455daf6f0693c5c64736f6c634300060c0033","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"52882:1753:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;","srcMapRuntime":"52882:1753:0:-:0;;;;;;;;","abiDefinition":[],"userDoc":{"kind":"user","methods":{},"notice":"A library that provides EIP712 helper functions","version":1},"developerDoc":{"kind":"dev","methods":{},"title":"EIP712","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"title\":\"EIP712\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"notice\":\"A library that provides EIP712 helper functions\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"EIP712\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{}},"/solidity/FiatToken.sol:EIP712Domain":{"code":"0x6080604052348015600f57600080fd5b5060818061001e6000396000f3fe6080604052348015600f57600080fd5b506004361060285760003560e01c80633644e51514602d575b600080fd5b60336045565b60408051918252519081900360200190f35b6000548156fea264697066735822122085865953d62e059c8c7e8659d0a0f3fdc853dd2575d5b741deca7e314bb4265964736f6c634300060c0033","runtime-code":"0x6080604052348015600f57600080fd5b506004361060285760003560e01c80633644e51514602d575b600080fd5b60336045565b60408051918252519081900360200190f35b6000548156fea264697066735822122085865953d62e059c8c7e8659d0a0f3fdc853dd2575d5b741deca7e314bb4265964736f6c634300060c0033","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"55884:119:0:-:0;;;;;;;;;;;;;;;;;;;","srcMapRuntime":"55884:119:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;55968:31;;;:::i;:::-;;;;;;;;;;;;;;;;;;;;:::o","abiDefinition":[{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"}],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"kind":"dev","methods":{},"stateVariables":{"DOMAIN_SEPARATOR":{"details":"EIP712 Domain Separator"}},"title":"EIP712 Domain","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[],\"name\":\"DOMAIN_SEPARATOR\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"stateVariables\":{\"DOMAIN_SEPARATOR\":{\"details\":\"EIP712 Domain Separator\"}},\"title\":\"EIP712 Domain\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"EIP712Domain\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"DOMAIN_SEPARATOR()":"3644e515"}},"/solidity/FiatToken.sol:FiatTokenV1":{"code":"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File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, 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ferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"unBlacklist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newBlacklister","type":"address"}],"name":"updateBlacklister","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newMasterMinter","type":"address"}],"name":"updateMasterMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newPauser","type":"address"}],"name":"updatePauser","outputs":[],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{"allowance(address,address)":{"notice":"Amount of remaining tokens spender is allowed to transfer on behalf of the token owner"},"approve(address,uint256)":{"notice":"Set spender's allowance over the caller's tokens to be a given value."},"transfer(address,uint256)":{"notice":"Transfer tokens from the caller"},"transferFrom(address,address,uint256)":{"notice":"Transfer tokens by spending allowance"}},"version":1},"developerDoc":{"details":"ERC20 Token backed by fiat reserves","kind":"dev","methods":{"allowance(address,address)":{"params":{"owner":"Token owner's address","spender":"Spender's address"},"returns":{"_0":"Allowance amount"}},"approve(address,uint256)":{"params":{"spender":"Spender's address","value":"Allowance amount"},"returns":{"_0":"True if successful"}},"balanceOf(address)":{"details":"Get token balance of an account","params":{"account":"address The account"}},"blacklist(address)":{"details":"Adds account to blacklist","params":{"_account":"The address to blacklist"}},"burn(uint256)":{"details":"allows a minter to burn some of its own tokens Validates that caller is a minter and that sender is not blacklisted amount is less than or equal to the minter's account balance","params":{"_amount":"uint256 the amount of tokens to be burned"}},"configureMinter(address,uint256)":{"details":"Function to add/update a new minter","params":{"minter":"The address of the minter","minterAllowedAmount":"The minting amount allowed for the minter"},"returns":{"_0":"True if the operation was successful."}},"isBlacklisted(address)":{"details":"Checks if account is blacklisted","params":{"_account":"The address to check"}},"isMinter(address)":{"details":"Checks if account is a minter","params":{"account":"The address to check"}},"mint(address,uint256)":{"details":"Function to mint tokens","params":{"_amount":"The amount of tokens to mint. Must be less than or equal to the minterAllowance of the caller.","_to":"The address that will receive the minted tokens."},"returns":{"_0":"A boolean that indicates if the operation was successful."}},"minterAllowance(address)":{"details":"Get minter allowance for an account","params":{"minter":"The address of the minter"}},"owner()":{"details":"Tells the address of the owner","returns":{"_0":"the address of the owner"}},"pause()":{"details":"called by the owner to pause, triggers stopped state"},"removeMinter(address)":{"details":"Function to remove a minter","params":{"minter":"The address of the minter to remove"},"returns":{"_0":"True if the operation was successful."}},"totalSupply()":{"details":"Get totalSupply of token"},"transfer(address,uint256)":{"params":{"to":"Payee's address","value":"Transfer amount"},"returns":{"_0":"True if successful"}},"transferFrom(address,address,uint256)":{"params":{"from":"Payer's address","to":"Payee's address","value":"Transfer amount"},"returns":{"_0":"True if successful"}},"transferOwnership(address)":{"details":"Allows the current owner to transfer control of the contract to a newOwner.","params":{"newOwner":"The address to transfer ownership to."}},"unBlacklist(address)":{"details":"Removes account from blacklist","params":{"_account":"The address to remove from the blacklist"}},"unpause()":{"details":"called by the owner to unpause, returns to normal state"},"updatePauser(address)":{"details":"update the pauser role"}},"title":"FiatToken","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"Blacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"}],\"name\":\"BlacklisterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"burner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Burn\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"}],\"name\":\"MasterMinterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Mint\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"MinterConfigured\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"oldMinter\",\"type\":\"address\"}],\"name\":\"MinterRemoved\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Pause\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newAddress\",\"type\":\"address\"}],\"name\":\"PauserChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"UnBlacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Unpause\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"blacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"blacklister\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"burn\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"configureMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"currency\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"tokenName\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenSymbol\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenCurrency\",\"type\":\"string\"},{\"internalType\":\"uint8\",\"name\":\"tokenDecimals\",\"type\":\"uint8\"},{\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newPauser\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"initialize\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"isBlacklisted\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"isMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"masterMinter\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"minterAllowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"paused\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pauser\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"removeMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"unBlacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"unpause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newBlacklister\",\"type\":\"address\"}],\"name\":\"updateBlacklister\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newMasterMinter\",\"type\":\"address\"}],\"name\":\"updateMasterMinter\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newPauser\",\"type\":\"address\"}],\"name\":\"updatePauser\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"ERC20 Token backed by fiat reserves\",\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"params\":{\"owner\":\"Token owner's address\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"Allowance amount\"}},\"approve(address,uint256)\":{\"params\":{\"spender\":\"Spender's address\",\"value\":\"Allowance amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"balanceOf(address)\":{\"details\":\"Get token balance of an account\",\"params\":{\"account\":\"address The account\"}},\"blacklist(address)\":{\"details\":\"Adds account to blacklist\",\"params\":{\"_account\":\"The address to blacklist\"}},\"burn(uint256)\":{\"details\":\"allows a minter to burn some of its own tokens Validates that caller is a minter and that sender is not blacklisted amount is less than or equal to the minter's account balance\",\"params\":{\"_amount\":\"uint256 the amount of tokens to be burned\"}},\"configureMinter(address,uint256)\":{\"details\":\"Function to add/update a new minter\",\"params\":{\"minter\":\"The address of the minter\",\"minterAllowedAmount\":\"The minting amount allowed for the minter\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"isBlacklisted(address)\":{\"details\":\"Checks if account is blacklisted\",\"params\":{\"_account\":\"The address to check\"}},\"isMinter(address)\":{\"details\":\"Checks if account is a minter\",\"params\":{\"account\":\"The address to check\"}},\"mint(address,uint256)\":{\"details\":\"Function to mint tokens\",\"params\":{\"_amount\":\"The amount of tokens to mint. Must be less than or equal to the minterAllowance of the caller.\",\"_to\":\"The address that will receive the minted tokens.\"},\"returns\":{\"_0\":\"A boolean that indicates if the operation was successful.\"}},\"minterAllowance(address)\":{\"details\":\"Get minter allowance for an account\",\"params\":{\"minter\":\"The address of the minter\"}},\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"pause()\":{\"details\":\"called by the owner to pause, triggers stopped state\"},\"removeMinter(address)\":{\"details\":\"Function to remove a minter\",\"params\":{\"minter\":\"The address of the minter to remove\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"totalSupply()\":{\"details\":\"Get totalSupply of token\"},\"transfer(address,uint256)\":{\"params\":{\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferFrom(address,address,uint256)\":{\"params\":{\"from\":\"Payer's address\",\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}},\"unBlacklist(address)\":{\"details\":\"Removes account from blacklist\",\"params\":{\"_account\":\"The address to remove from the blacklist\"}},\"unpause()\":{\"details\":\"called by the owner to unpause, returns to normal state\"},\"updatePauser(address)\":{\"details\":\"update the pauser role\"}},\"title\":\"FiatToken\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{\"allowance(address,address)\":{\"notice\":\"Amount of remaining tokens spender is allowed to transfer on behalf of the token owner\"},\"approve(address,uint256)\":{\"notice\":\"Set spender's allowance over the caller's tokens to be a given value.\"},\"transfer(address,uint256)\":{\"notice\":\"Transfer tokens from the caller\"},\"transferFrom(address,address,uint256)\":{\"notice\":\"Transfer tokens by spending allowance\"}},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"FiatTokenV1\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","balanceOf(address)":"70a08231","blacklist(address)":"f9f92be4","blacklister()":"bd102430","burn(uint256)":"42966c68","configureMinter(address,uint256)":"4e44d956","currency()":"e5a6b10f","decimals()":"313ce567","initialize(string,string,string,uint8,address,address,address,address)":"3357162b","isBlacklisted(address)":"fe575a87","isMinter(address)":"aa271e1a","masterMinter()":"35d99f35","mint(address,uint256)":"40c10f19","minterAllowance(address)":"8a6db9c3","name()":"06fdde03","owner()":"8da5cb5b","pause()":"8456cb59","paused()":"5c975abb","pauser()":"9fd0506d","removeMinter(address)":"3092afd5","symbol()":"95d89b41","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd","transferOwnership(address)":"f2fde38b","unBlacklist(address)":"1a895266","unpause()":"3f4ba83a","updateBlacklister(address)":"ad38bf22","updateMasterMinter(address)":"aa20e1e4","updatePauser(address)":"554bab3c"}},"/solidity/FiatToken.sol:FiatTokenV1_1":{"code":"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File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, 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of remaining tokens spender is allowed to transfer on behalf of the token owner"},"approve(address,uint256)":{"notice":"Set spender's allowance over the caller's tokens to be a given value."},"rescueERC20(address,address,uint256)":{"notice":"Rescue ERC20 tokens locked up in this contract."},"rescuer()":{"notice":"Returns current rescuer"},"transfer(address,uint256)":{"notice":"Transfer tokens from the caller"},"transferFrom(address,address,uint256)":{"notice":"Transfer tokens by spending allowance"},"updateRescuer(address)":{"notice":"Assign the rescuer role to a given address."}},"version":1},"developerDoc":{"details":"ERC20 Token backed by fiat reserves","kind":"dev","methods":{"allowance(address,address)":{"params":{"owner":"Token owner's address","spender":"Spender's address"},"returns":{"_0":"Allowance amount"}},"approve(address,uint256)":{"params":{"spender":"Spender's address","value":"Allowance amount"},"returns":{"_0":"True if successful"}},"balanceOf(address)":{"details":"Get 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Must be less than or equal to the minterAllowance of the caller.","_to":"The address that will receive the minted tokens."},"returns":{"_0":"A boolean that indicates if the operation was successful."}},"minterAllowance(address)":{"details":"Get minter allowance for an account","params":{"minter":"The address of the minter"}},"owner()":{"details":"Tells the address of the owner","returns":{"_0":"the address of the owner"}},"pause()":{"details":"called by the owner to pause, triggers stopped state"},"removeMinter(address)":{"details":"Function to remove a minter","params":{"minter":"The address of the minter to remove"},"returns":{"_0":"True if the operation was successful."}},"rescueERC20(address,address,uint256)":{"params":{"amount":"Amount to withdraw","to":"Recipient address","tokenContract":"ERC20 token contract address"}},"rescuer()":{"returns":{"_0":"Rescuer's address"}},"totalSupply()":{"details":"Get totalSupply of token"},"transfer(address,uint256)":{"params":{"to":"Payee's address","value":"Transfer amount"},"returns":{"_0":"True if successful"}},"transferFrom(address,address,uint256)":{"params":{"from":"Payer's address","to":"Payee's address","value":"Transfer amount"},"returns":{"_0":"True if successful"}},"transferOwnership(address)":{"details":"Allows the current owner to transfer control of the contract to a newOwner.","params":{"newOwner":"The address to transfer ownership to."}},"unBlacklist(address)":{"details":"Removes account from blacklist","params":{"_account":"The address to remove from the blacklist"}},"unpause()":{"details":"called by the owner to unpause, returns to normal state"},"updatePauser(address)":{"details":"update the pauser role"},"updateRescuer(address)":{"params":{"newRescuer":"New rescuer's address"}}},"title":"FiatTokenV1_1","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"Blacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"}],\"name\":\"BlacklisterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"burner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Burn\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"}],\"name\":\"MasterMinterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Mint\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"MinterConfigured\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"oldMinter\",\"type\":\"address\"}],\"name\":\"MinterRemoved\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Pause\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newAddress\",\"type\":\"address\"}],\"name\":\"PauserChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"RescuerChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"UnBlacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Unpause\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"blacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"blacklister\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"burn\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"configureMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"currency\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"tokenName\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenSymbol\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenCurrency\",\"type\":\"string\"},{\"internalType\":\"uint8\",\"name\":\"tokenDecimals\",\"type\":\"uint8\"},{\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newPauser\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"initialize\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"isBlacklisted\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"isMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"masterMinter\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"minterAllowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"paused\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pauser\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"removeMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"contract IERC20\",\"name\":\"tokenContract\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"rescueERC20\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"rescuer\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"unBlacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"unpause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newBlacklister\",\"type\":\"address\"}],\"name\":\"updateBlacklister\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newMasterMinter\",\"type\":\"address\"}],\"name\":\"updateMasterMinter\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newPauser\",\"type\":\"address\"}],\"name\":\"updatePauser\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"updateRescuer\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"ERC20 Token backed by fiat reserves\",\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"params\":{\"owner\":\"Token owner's address\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"Allowance amount\"}},\"approve(address,uint256)\":{\"params\":{\"spender\":\"Spender's address\",\"value\":\"Allowance amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"balanceOf(address)\":{\"details\":\"Get token balance of an account\",\"params\":{\"account\":\"address The account\"}},\"blacklist(address)\":{\"details\":\"Adds account to blacklist\",\"params\":{\"_account\":\"The address to blacklist\"}},\"burn(uint256)\":{\"details\":\"allows a minter to burn some of its own tokens Validates that caller is a minter and that sender is not blacklisted amount is less than or equal to the minter's account balance\",\"params\":{\"_amount\":\"uint256 the amount of tokens to be burned\"}},\"configureMinter(address,uint256)\":{\"details\":\"Function to add/update a new minter\",\"params\":{\"minter\":\"The address of the minter\",\"minterAllowedAmount\":\"The minting amount allowed for the minter\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"isBlacklisted(address)\":{\"details\":\"Checks if account is blacklisted\",\"params\":{\"_account\":\"The address to check\"}},\"isMinter(address)\":{\"details\":\"Checks if account is a minter\",\"params\":{\"account\":\"The address to check\"}},\"mint(address,uint256)\":{\"details\":\"Function to mint tokens\",\"params\":{\"_amount\":\"The amount of tokens to mint. Must be less than or equal to the minterAllowance of the caller.\",\"_to\":\"The address that will receive the minted tokens.\"},\"returns\":{\"_0\":\"A boolean that indicates if the operation was successful.\"}},\"minterAllowance(address)\":{\"details\":\"Get minter allowance for an account\",\"params\":{\"minter\":\"The address of the minter\"}},\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"pause()\":{\"details\":\"called by the owner to pause, triggers stopped state\"},\"removeMinter(address)\":{\"details\":\"Function to remove a minter\",\"params\":{\"minter\":\"The address of the minter to remove\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"rescueERC20(address,address,uint256)\":{\"params\":{\"amount\":\"Amount to withdraw\",\"to\":\"Recipient address\",\"tokenContract\":\"ERC20 token contract address\"}},\"rescuer()\":{\"returns\":{\"_0\":\"Rescuer's address\"}},\"totalSupply()\":{\"details\":\"Get totalSupply of token\"},\"transfer(address,uint256)\":{\"params\":{\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferFrom(address,address,uint256)\":{\"params\":{\"from\":\"Payer's address\",\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}},\"unBlacklist(address)\":{\"details\":\"Removes account from blacklist\",\"params\":{\"_account\":\"The address to remove from the blacklist\"}},\"unpause()\":{\"details\":\"called by the owner to unpause, returns to normal state\"},\"updatePauser(address)\":{\"details\":\"update the pauser role\"},\"updateRescuer(address)\":{\"params\":{\"newRescuer\":\"New rescuer's address\"}}},\"title\":\"FiatTokenV1_1\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{\"allowance(address,address)\":{\"notice\":\"Amount of remaining tokens spender is allowed to transfer on behalf of the token owner\"},\"approve(address,uint256)\":{\"notice\":\"Set spender's allowance over the caller's tokens to be a given value.\"},\"rescueERC20(address,address,uint256)\":{\"notice\":\"Rescue ERC20 tokens locked up in this contract.\"},\"rescuer()\":{\"notice\":\"Returns current rescuer\"},\"transfer(address,uint256)\":{\"notice\":\"Transfer tokens from the caller\"},\"transferFrom(address,address,uint256)\":{\"notice\":\"Transfer tokens by spending allowance\"},\"updateRescuer(address)\":{\"notice\":\"Assign the rescuer role to a given address.\"}},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"FiatTokenV1_1\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","balanceOf(address)":"70a08231","blacklist(address)":"f9f92be4","blacklister()":"bd102430","burn(uint256)":"42966c68","configureMinter(address,uint256)":"4e44d956","currency()":"e5a6b10f","decimals()":"313ce567","initialize(string,string,string,uint8,address,address,address,address)":"3357162b","isBlacklisted(address)":"fe575a87","isMinter(address)":"aa271e1a","masterMinter()":"35d99f35","mint(address,uint256)":"40c10f19","minterAllowance(address)":"8a6db9c3","name()":"06fdde03","owner()":"8da5cb5b","pause()":"8456cb59","paused()":"5c975abb","pauser()":"9fd0506d","removeMinter(address)":"3092afd5","rescueERC20(address,address,uint256)":"b2118a8d","rescuer()":"38a63183","symbol()":"95d89b41","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd","transferOwnership(address)":"f2fde38b","unBlacklist(address)":"1a895266","unpause()":"3f4ba83a","updateBlacklister(address)":"ad38bf22","updateMasterMinter(address)":"aa20e1e4","updatePauser(address)":"554bab3c","updateRescuer(address)":"2ab60045"}},"/solidity/FiatToken.sol:FiatTokenV2":{"code":"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File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, 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transferred"}},"unBlacklist(address)":{"details":"Removes account from blacklist","params":{"_account":"The address to remove from the blacklist"}},"unpause()":{"details":"called by the owner to unpause, returns to normal state"},"updatePauser(address)":{"details":"update the pauser role"},"updateRescuer(address)":{"params":{"newRescuer":"New rescuer's address"}}},"title":"FiatToken V2","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"AuthorizationCanceled\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"AuthorizationUsed\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"Blacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"}],\"name\":\"BlacklisterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"burner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Burn\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"}],\"name\":\"MasterMinterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Mint\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"MinterConfigured\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"oldMinter\",\"type\":\"address\"}],\"name\":\"MinterRemoved\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Pause\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newAddress\",\"type\":\"address\"}],\"name\":\"PauserChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"RescuerChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"UnBlacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Unpause\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"CANCEL_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"DOMAIN_SEPARATOR\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"PERMIT_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RECEIVE_WITH_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"TRANSFER_WITH_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"authorizationState\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"blacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"blacklister\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"burn\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"cancelAuthorization\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"configureMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"currency\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"decrement\",\"type\":\"uint256\"}],\"name\":\"decreaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"increment\",\"type\":\"uint256\"}],\"name\":\"increaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"tokenName\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenSymbol\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenCurrency\",\"type\":\"string\"},{\"internalType\":\"uint8\",\"name\":\"tokenDecimals\",\"type\":\"uint8\"},{\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newPauser\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"initialize\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"newName\",\"type\":\"string\"}],\"name\":\"initializeV2\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"isBlacklisted\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"isMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"masterMinter\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"minterAllowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"name\":\"nonces\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"paused\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pauser\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"deadline\",\"type\":\"uint256\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"permit\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validAfter\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validBefore\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"receiveWithAuthorization\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"removeMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"contract IERC20\",\"name\":\"tokenContract\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"rescueERC20\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"rescuer\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validAfter\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validBefore\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"transferWithAuthorization\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"unBlacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"unpause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newBlacklister\",\"type\":\"address\"}],\"name\":\"updateBlacklister\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newMasterMinter\",\"type\":\"address\"}],\"name\":\"updateMasterMinter\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newPauser\",\"type\":\"address\"}],\"name\":\"updatePauser\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"updateRescuer\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"params\":{\"owner\":\"Token owner's address\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"Allowance amount\"}},\"approve(address,uint256)\":{\"params\":{\"spender\":\"Spender's address\",\"value\":\"Allowance amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"authorizationState(address,bytes32)\":{\"details\":\"Nonces are randomly generated 32-byte data unique to the authorizer's address\",\"params\":{\"authorizer\":\"Authorizer's address\",\"nonce\":\"Nonce of the authorization\"},\"returns\":{\"_0\":\"True if the nonce is used\"}},\"balanceOf(address)\":{\"details\":\"Get token balance of an account\",\"params\":{\"account\":\"address The account\"}},\"blacklist(address)\":{\"details\":\"Adds account to blacklist\",\"params\":{\"_account\":\"The address to blacklist\"}},\"burn(uint256)\":{\"details\":\"allows a minter to burn some of its own tokens Validates that caller is a minter and that sender is not blacklisted amount is less than or equal to the minter's account balance\",\"params\":{\"_amount\":\"uint256 the amount of tokens to be burned\"}},\"cancelAuthorization(address,bytes32,uint8,bytes32,bytes32)\":{\"details\":\"Works only if the authorization is not yet used.\",\"params\":{\"authorizer\":\"Authorizer's address\",\"nonce\":\"Nonce of the authorization\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"v\":\"v of the signature\"}},\"configureMinter(address,uint256)\":{\"details\":\"Function to add/update a new minter\",\"params\":{\"minter\":\"The address of the minter\",\"minterAllowedAmount\":\"The minting amount allowed for the minter\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"decreaseAllowance(address,uint256)\":{\"params\":{\"decrement\":\"Amount of decrease in allowance\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"True if successful\"}},\"increaseAllowance(address,uint256)\":{\"params\":{\"increment\":\"Amount of increase in allowance\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"True if successful\"}},\"initializeV2(string)\":{\"params\":{\"newName\":\"New token name\"}},\"isBlacklisted(address)\":{\"details\":\"Checks if account is blacklisted\",\"params\":{\"_account\":\"The address to check\"}},\"isMinter(address)\":{\"details\":\"Checks if account is a minter\",\"params\":{\"account\":\"The address to check\"}},\"mint(address,uint256)\":{\"details\":\"Function to mint tokens\",\"params\":{\"_amount\":\"The amount of tokens to mint. Must be less than or equal to the minterAllowance of the caller.\",\"_to\":\"The address that will receive the minted tokens.\"},\"returns\":{\"_0\":\"A boolean that indicates if the operation was successful.\"}},\"minterAllowance(address)\":{\"details\":\"Get minter allowance for an account\",\"params\":{\"minter\":\"The address of the minter\"}},\"nonces(address)\":{\"params\":{\"owner\":\"Token owner's address (Authorizer)\"},\"returns\":{\"_0\":\"Next nonce\"}},\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"pause()\":{\"details\":\"called by the owner to pause, triggers stopped state\"},\"permit(address,address,uint256,uint256,uint8,bytes32,bytes32)\":{\"params\":{\"deadline\":\"Expiration time, seconds since the epoch\",\"owner\":\"Token owner's address (Authorizer)\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"spender\":\"Spender's address\",\"v\":\"v of the signature\",\"value\":\"Amount of allowance\"}},\"receiveWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"details\":\"This has an additional check to ensure that the payee's address matches the caller of this function to prevent front-running attacks.\",\"params\":{\"from\":\"Payer's address (Authorizer)\",\"nonce\":\"Unique nonce\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"to\":\"Payee's address\",\"v\":\"v of the signature\",\"validAfter\":\"The time after which this is valid (unix time)\",\"validBefore\":\"The time before which this is valid (unix time)\",\"value\":\"Amount to be transferred\"}},\"removeMinter(address)\":{\"details\":\"Function to remove a minter\",\"params\":{\"minter\":\"The address of the minter to remove\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"rescueERC20(address,address,uint256)\":{\"params\":{\"amount\":\"Amount to withdraw\",\"to\":\"Recipient address\",\"tokenContract\":\"ERC20 token contract address\"}},\"rescuer()\":{\"returns\":{\"_0\":\"Rescuer's address\"}},\"totalSupply()\":{\"details\":\"Get totalSupply of token\"},\"transfer(address,uint256)\":{\"params\":{\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferFrom(address,address,uint256)\":{\"params\":{\"from\":\"Payer's address\",\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}},\"transferWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"params\":{\"from\":\"Payer's address (Authorizer)\",\"nonce\":\"Unique nonce\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"to\":\"Payee's address\",\"v\":\"v of the signature\",\"validAfter\":\"The time after which this is valid (unix time)\",\"validBefore\":\"The time before which this is valid (unix time)\",\"value\":\"Amount to be transferred\"}},\"unBlacklist(address)\":{\"details\":\"Removes account from blacklist\",\"params\":{\"_account\":\"The address to remove from the blacklist\"}},\"unpause()\":{\"details\":\"called by the owner to unpause, returns to normal state\"},\"updatePauser(address)\":{\"details\":\"update the pauser role\"},\"updateRescuer(address)\":{\"params\":{\"newRescuer\":\"New rescuer's address\"}}},\"title\":\"FiatToken V2\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{\"allowance(address,address)\":{\"notice\":\"Amount of remaining tokens spender is allowed to transfer on behalf of the token owner\"},\"approve(address,uint256)\":{\"notice\":\"Set spender's allowance over the caller's tokens to be a given value.\"},\"authorizationState(address,bytes32)\":{\"notice\":\"Returns the state of an authorization\"},\"cancelAuthorization(address,bytes32,uint8,bytes32,bytes32)\":{\"notice\":\"Attempt to cancel an authorization\"},\"decreaseAllowance(address,uint256)\":{\"notice\":\"Decrease the allowance by a given decrement\"},\"increaseAllowance(address,uint256)\":{\"notice\":\"Increase the allowance by a given increment\"},\"initializeV2(string)\":{\"notice\":\"Initialize v2\"},\"nonces(address)\":{\"notice\":\"Nonces for permit\"},\"permit(address,address,uint256,uint256,uint8,bytes32,bytes32)\":{\"notice\":\"Update allowance with a signed permit\"},\"receiveWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"notice\":\"Receive a transfer with a signed authorization from the payer\"},\"rescueERC20(address,address,uint256)\":{\"notice\":\"Rescue ERC20 tokens locked up in this contract.\"},\"rescuer()\":{\"notice\":\"Returns current rescuer\"},\"transfer(address,uint256)\":{\"notice\":\"Transfer tokens from the caller\"},\"transferFrom(address,address,uint256)\":{\"notice\":\"Transfer tokens by spending allowance\"},\"transferWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"notice\":\"Execute a transfer with a signed authorization\"},\"updateRescuer(address)\":{\"notice\":\"Assign the rescuer role to a given address.\"}},\"notice\":\"ERC20 Token backed by fiat reserves, version 2\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"FiatTokenV2\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"CANCEL_AUTHORIZATION_TYPEHASH()":"d9169487","DOMAIN_SEPARATOR()":"3644e515","PERMIT_TYPEHASH()":"30adf81f","RECEIVE_WITH_AUTHORIZATION_TYPEHASH()":"7f2eecc3","TRANSFER_WITH_AUTHORIZATION_TYPEHASH()":"a0cc6a68","allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","authorizationState(address,bytes32)":"e94a0102","balanceOf(address)":"70a08231","blacklist(address)":"f9f92be4","blacklister()":"bd102430","burn(uint256)":"42966c68","cancelAuthorization(address,bytes32,uint8,bytes32,bytes32)":"5a049a70","configureMinter(address,uint256)":"4e44d956","currency()":"e5a6b10f","decimals()":"313ce567","decreaseAllowance(address,uint256)":"a457c2d7","increaseAllowance(address,uint256)":"39509351","initialize(string,string,string,uint8,address,address,address,address)":"3357162b","initializeV2(string)":"d608ea64","isBlacklisted(address)":"fe575a87","isMinter(address)":"aa271e1a","masterMinter()":"35d99f35","mint(address,uint256)":"40c10f19","minterAllowance(address)":"8a6db9c3","name()":"06fdde03","nonces(address)":"7ecebe00","owner()":"8da5cb5b","pause()":"8456cb59","paused()":"5c975abb","pauser()":"9fd0506d","permit(address,address,uint256,uint256,uint8,bytes32,bytes32)":"d505accf","receiveWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)":"ef55bec6","removeMinter(address)":"3092afd5","rescueERC20(address,address,uint256)":"b2118a8d","rescuer()":"38a63183","symbol()":"95d89b41","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd","transferOwnership(address)":"f2fde38b","transferWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)":"e3ee160e","unBlacklist(address)":"1a895266","unpause()":"3f4ba83a","updateBlacklister(address)":"ad38bf22","updateMasterMinter(address)":"aa20e1e4","updatePauser(address)":"554bab3c","updateRescuer(address)":"2ab60045"}},"/solidity/FiatToken.sol:FiatTokenV2_1":{"code":"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File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, 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address"}},"totalSupply()":{"details":"Get totalSupply of token"},"transfer(address,uint256)":{"params":{"to":"Payee's address","value":"Transfer amount"},"returns":{"_0":"True if successful"}},"transferFrom(address,address,uint256)":{"params":{"from":"Payer's address","to":"Payee's address","value":"Transfer amount"},"returns":{"_0":"True if successful"}},"transferOwnership(address)":{"details":"Allows the current owner to transfer control of the contract to a newOwner.","params":{"newOwner":"The address to transfer ownership to."}},"transferWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)":{"params":{"from":"Payer's address (Authorizer)","nonce":"Unique nonce","r":"r of the signature","s":"s of the signature","to":"Payee's address","v":"v of the signature","validAfter":"The time after which this is valid (unix time)","validBefore":"The time before which this is valid (unix time)","value":"Amount to be transferred"}},"unBlacklist(address)":{"details":"Removes account from blacklist","params":{"_account":"The address to remove from the blacklist"}},"unpause()":{"details":"called by the owner to unpause, returns to normal state"},"updatePauser(address)":{"details":"update the pauser role"},"updateRescuer(address)":{"params":{"newRescuer":"New rescuer's address"}},"version()":{"returns":{"_0":"Version string"}}},"title":"FiatToken V2.1","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"AuthorizationCanceled\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"AuthorizationUsed\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"Blacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"}],\"name\":\"BlacklisterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"burner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Burn\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"}],\"name\":\"MasterMinterChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Mint\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"MinterConfigured\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"oldMinter\",\"type\":\"address\"}],\"name\":\"MinterRemoved\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Pause\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newAddress\",\"type\":\"address\"}],\"name\":\"PauserChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"RescuerChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"UnBlacklisted\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Unpause\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"CANCEL_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"DOMAIN_SEPARATOR\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"PERMIT_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RECEIVE_WITH_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"TRANSFER_WITH_AUTHORIZATION_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"}],\"name\":\"authorizationState\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"blacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"blacklister\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"burn\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"authorizer\",\"type\":\"address\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"cancelAuthorization\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"minterAllowedAmount\",\"type\":\"uint256\"}],\"name\":\"configureMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"currency\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"decrement\",\"type\":\"uint256\"}],\"name\":\"decreaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"increment\",\"type\":\"uint256\"}],\"name\":\"increaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"tokenName\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenSymbol\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"tokenCurrency\",\"type\":\"string\"},{\"internalType\":\"uint8\",\"name\":\"tokenDecimals\",\"type\":\"uint8\"},{\"internalType\":\"address\",\"name\":\"newMasterMinter\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newPauser\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newBlacklister\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"initialize\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"newName\",\"type\":\"string\"}],\"name\":\"initializeV2\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"lostAndFound\",\"type\":\"address\"}],\"name\":\"initializeV2_1\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"isBlacklisted\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"isMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"masterMinter\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"minterAllowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"name\":\"nonces\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"paused\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pauser\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"deadline\",\"type\":\"uint256\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"permit\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validAfter\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validBefore\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"receiveWithAuthorization\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"minter\",\"type\":\"address\"}],\"name\":\"removeMinter\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"contract IERC20\",\"name\":\"tokenContract\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"rescueERC20\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"rescuer\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validAfter\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"validBefore\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"nonce\",\"type\":\"bytes32\"},{\"internalType\":\"uint8\",\"name\":\"v\",\"type\":\"uint8\"},{\"internalType\":\"bytes32\",\"name\":\"r\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"transferWithAuthorization\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_account\",\"type\":\"address\"}],\"name\":\"unBlacklist\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"unpause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newBlacklister\",\"type\":\"address\"}],\"name\":\"updateBlacklister\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newMasterMinter\",\"type\":\"address\"}],\"name\":\"updateMasterMinter\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newPauser\",\"type\":\"address\"}],\"name\":\"updatePauser\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"updateRescuer\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"version\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"params\":{\"owner\":\"Token owner's address\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"Allowance amount\"}},\"approve(address,uint256)\":{\"params\":{\"spender\":\"Spender's address\",\"value\":\"Allowance amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"authorizationState(address,bytes32)\":{\"details\":\"Nonces are randomly generated 32-byte data unique to the authorizer's address\",\"params\":{\"authorizer\":\"Authorizer's address\",\"nonce\":\"Nonce of the authorization\"},\"returns\":{\"_0\":\"True if the nonce is used\"}},\"balanceOf(address)\":{\"details\":\"Get token balance of an account\",\"params\":{\"account\":\"address The account\"}},\"blacklist(address)\":{\"details\":\"Adds account to blacklist\",\"params\":{\"_account\":\"The address to blacklist\"}},\"burn(uint256)\":{\"details\":\"allows a minter to burn some of its own tokens Validates that caller is a minter and that sender is not blacklisted amount is less than or equal to the minter's account balance\",\"params\":{\"_amount\":\"uint256 the amount of tokens to be burned\"}},\"cancelAuthorization(address,bytes32,uint8,bytes32,bytes32)\":{\"details\":\"Works only if the authorization is not yet used.\",\"params\":{\"authorizer\":\"Authorizer's address\",\"nonce\":\"Nonce of the authorization\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"v\":\"v of the signature\"}},\"configureMinter(address,uint256)\":{\"details\":\"Function to add/update a new minter\",\"params\":{\"minter\":\"The address of the minter\",\"minterAllowedAmount\":\"The minting amount allowed for the minter\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"decreaseAllowance(address,uint256)\":{\"params\":{\"decrement\":\"Amount of decrease in allowance\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"True if successful\"}},\"increaseAllowance(address,uint256)\":{\"params\":{\"increment\":\"Amount of increase in allowance\",\"spender\":\"Spender's address\"},\"returns\":{\"_0\":\"True if successful\"}},\"initializeV2(string)\":{\"params\":{\"newName\":\"New token name\"}},\"initializeV2_1(address)\":{\"params\":{\"lostAndFound\":\"The address to which the locked funds are sent\"}},\"isBlacklisted(address)\":{\"details\":\"Checks if account is blacklisted\",\"params\":{\"_account\":\"The address to check\"}},\"isMinter(address)\":{\"details\":\"Checks if account is a minter\",\"params\":{\"account\":\"The address to check\"}},\"mint(address,uint256)\":{\"details\":\"Function to mint tokens\",\"params\":{\"_amount\":\"The amount of tokens to mint. Must be less than or equal to the minterAllowance of the caller.\",\"_to\":\"The address that will receive the minted tokens.\"},\"returns\":{\"_0\":\"A boolean that indicates if the operation was successful.\"}},\"minterAllowance(address)\":{\"details\":\"Get minter allowance for an account\",\"params\":{\"minter\":\"The address of the minter\"}},\"nonces(address)\":{\"params\":{\"owner\":\"Token owner's address (Authorizer)\"},\"returns\":{\"_0\":\"Next nonce\"}},\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"pause()\":{\"details\":\"called by the owner to pause, triggers stopped state\"},\"permit(address,address,uint256,uint256,uint8,bytes32,bytes32)\":{\"params\":{\"deadline\":\"Expiration time, seconds since the epoch\",\"owner\":\"Token owner's address (Authorizer)\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"spender\":\"Spender's address\",\"v\":\"v of the signature\",\"value\":\"Amount of allowance\"}},\"receiveWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"details\":\"This has an additional check to ensure that the payee's address matches the caller of this function to prevent front-running attacks.\",\"params\":{\"from\":\"Payer's address (Authorizer)\",\"nonce\":\"Unique nonce\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"to\":\"Payee's address\",\"v\":\"v of the signature\",\"validAfter\":\"The time after which this is valid (unix time)\",\"validBefore\":\"The time before which this is valid (unix time)\",\"value\":\"Amount to be transferred\"}},\"removeMinter(address)\":{\"details\":\"Function to remove a minter\",\"params\":{\"minter\":\"The address of the minter to remove\"},\"returns\":{\"_0\":\"True if the operation was successful.\"}},\"rescueERC20(address,address,uint256)\":{\"params\":{\"amount\":\"Amount to withdraw\",\"to\":\"Recipient address\",\"tokenContract\":\"ERC20 token contract address\"}},\"rescuer()\":{\"returns\":{\"_0\":\"Rescuer's address\"}},\"totalSupply()\":{\"details\":\"Get totalSupply of token\"},\"transfer(address,uint256)\":{\"params\":{\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferFrom(address,address,uint256)\":{\"params\":{\"from\":\"Payer's address\",\"to\":\"Payee's address\",\"value\":\"Transfer amount\"},\"returns\":{\"_0\":\"True if successful\"}},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}},\"transferWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"params\":{\"from\":\"Payer's address (Authorizer)\",\"nonce\":\"Unique nonce\",\"r\":\"r of the signature\",\"s\":\"s of the signature\",\"to\":\"Payee's address\",\"v\":\"v of the signature\",\"validAfter\":\"The time after which this is valid (unix time)\",\"validBefore\":\"The time before which this is valid (unix time)\",\"value\":\"Amount to be transferred\"}},\"unBlacklist(address)\":{\"details\":\"Removes account from blacklist\",\"params\":{\"_account\":\"The address to remove from the blacklist\"}},\"unpause()\":{\"details\":\"called by the owner to unpause, returns to normal state\"},\"updatePauser(address)\":{\"details\":\"update the pauser role\"},\"updateRescuer(address)\":{\"params\":{\"newRescuer\":\"New rescuer's address\"}},\"version()\":{\"returns\":{\"_0\":\"Version string\"}}},\"title\":\"FiatToken V2.1\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{\"allowance(address,address)\":{\"notice\":\"Amount of remaining tokens spender is allowed to transfer on behalf of the token owner\"},\"approve(address,uint256)\":{\"notice\":\"Set spender's allowance over the caller's tokens to be a given value.\"},\"authorizationState(address,bytes32)\":{\"notice\":\"Returns the state of an authorization\"},\"cancelAuthorization(address,bytes32,uint8,bytes32,bytes32)\":{\"notice\":\"Attempt to cancel an authorization\"},\"decreaseAllowance(address,uint256)\":{\"notice\":\"Decrease the allowance by a given decrement\"},\"increaseAllowance(address,uint256)\":{\"notice\":\"Increase the allowance by a given increment\"},\"initializeV2(string)\":{\"notice\":\"Initialize v2\"},\"initializeV2_1(address)\":{\"notice\":\"Initialize v2.1\"},\"nonces(address)\":{\"notice\":\"Nonces for permit\"},\"permit(address,address,uint256,uint256,uint8,bytes32,bytes32)\":{\"notice\":\"Update allowance with a signed permit\"},\"receiveWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"notice\":\"Receive a transfer with a signed authorization from the payer\"},\"rescueERC20(address,address,uint256)\":{\"notice\":\"Rescue ERC20 tokens locked up in this contract.\"},\"rescuer()\":{\"notice\":\"Returns current rescuer\"},\"transfer(address,uint256)\":{\"notice\":\"Transfer tokens from the caller\"},\"transferFrom(address,address,uint256)\":{\"notice\":\"Transfer tokens by spending allowance\"},\"transferWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)\":{\"notice\":\"Execute a transfer with a signed authorization\"},\"updateRescuer(address)\":{\"notice\":\"Assign the rescuer role to a given address.\"},\"version()\":{\"notice\":\"Version string for the EIP712 domain separator\"}},\"notice\":\"ERC20 Token backed by fiat reserves, version 2.1\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"FiatTokenV2_1\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"CANCEL_AUTHORIZATION_TYPEHASH()":"d9169487","DOMAIN_SEPARATOR()":"3644e515","PERMIT_TYPEHASH()":"30adf81f","RECEIVE_WITH_AUTHORIZATION_TYPEHASH()":"7f2eecc3","TRANSFER_WITH_AUTHORIZATION_TYPEHASH()":"a0cc6a68","allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","authorizationState(address,bytes32)":"e94a0102","balanceOf(address)":"70a08231","blacklist(address)":"f9f92be4","blacklister()":"bd102430","burn(uint256)":"42966c68","cancelAuthorization(address,bytes32,uint8,bytes32,bytes32)":"5a049a70","configureMinter(address,uint256)":"4e44d956","currency()":"e5a6b10f","decimals()":"313ce567","decreaseAllowance(address,uint256)":"a457c2d7","increaseAllowance(address,uint256)":"39509351","initialize(string,string,string,uint8,address,address,address,address)":"3357162b","initializeV2(string)":"d608ea64","initializeV2_1(address)":"2fc81e09","isBlacklisted(address)":"fe575a87","isMinter(address)":"aa271e1a","masterMinter()":"35d99f35","mint(address,uint256)":"40c10f19","minterAllowance(address)":"8a6db9c3","name()":"06fdde03","nonces(address)":"7ecebe00","owner()":"8da5cb5b","pause()":"8456cb59","paused()":"5c975abb","pauser()":"9fd0506d","permit(address,address,uint256,uint256,uint8,bytes32,bytes32)":"d505accf","receiveWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)":"ef55bec6","removeMinter(address)":"3092afd5","rescueERC20(address,address,uint256)":"b2118a8d","rescuer()":"38a63183","symbol()":"95d89b41","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd","transferOwnership(address)":"f2fde38b","transferWithAuthorization(address,address,uint256,uint256,uint256,bytes32,uint8,bytes32,bytes32)":"e3ee160e","unBlacklist(address)":"1a895266","unpause()":"3f4ba83a","updateBlacklister(address)":"ad38bf22","updateMasterMinter(address)":"aa20e1e4","updatePauser(address)":"554bab3c","updateRescuer(address)":"2ab60045","version()":"54fd4d50"}},"/solidity/FiatToken.sol:IERC20":{"code":"0x","runtime-code":"0x","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"","srcMapRuntime":"","abiDefinition":[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"details":"Interface of the ERC20 standard as defined in the EIP.","events":{"Approval(address,address,uint256)":{"details":"Emitted when the allowance of a `spender` for an `owner` is set by a call to {approve}. `value` is the new allowance."},"Transfer(address,address,uint256)":{"details":"Emitted when `value` tokens are moved from one account (`from`) to another (`to`). Note that `value` may be zero."}},"kind":"dev","methods":{"allowance(address,address)":{"details":"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called."},"approve(address,uint256)":{"details":"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event."},"balanceOf(address)":{"details":"Returns the amount of tokens owned by `account`."},"totalSupply()":{"details":"Returns the amount of tokens in existence."},"transfer(address,uint256)":{"details":"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."},"transferFrom(address,address,uint256)":{"details":"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event."}},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"Interface of the ERC20 standard as defined in the EIP.\",\"events\":{\"Approval(address,address,uint256)\":{\"details\":\"Emitted when the allowance of a `spender` for an `owner` is set by a call to {approve}. `value` is the new allowance.\"},\"Transfer(address,address,uint256)\":{\"details\":\"Emitted when `value` tokens are moved from one account (`from`) to another (`to`). Note that `value` may be zero.\"}},\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"details\":\"Returns the remaining number of tokens that `spender` will be allowed to spend on behalf of `owner` through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called.\"},\"approve(address,uint256)\":{\"details\":\"Sets `amount` as the allowance of `spender` over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event.\"},\"balanceOf(address)\":{\"details\":\"Returns the amount of tokens owned by `account`.\"},\"totalSupply()\":{\"details\":\"Returns the amount of tokens in existence.\"},\"transfer(address,uint256)\":{\"details\":\"Moves `amount` tokens from the caller's account to `recipient`. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"},\"transferFrom(address,address,uint256)\":{\"details\":\"Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.\"}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"IERC20\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"allowance(address,address)":"dd62ed3e","approve(address,uint256)":"095ea7b3","balanceOf(address)":"70a08231","totalSupply()":"18160ddd","transfer(address,uint256)":"a9059cbb","transferFrom(address,address,uint256)":"23b872dd"}},"/solidity/FiatToken.sol:Ownable":{"code":"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","runtime-code":"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","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"11696:1552:0:-:0;;;12185:60;;;;;;;;;-1:-1:-1;12217:20:0;12226:10;12217:8;:20::i;:::-;11696:1552;;12501:81;12557:6;:17;;-1:-1:-1;;;;;;12557:17:0;-1:-1:-1;;;;;12557:17:0;;;;;;;;;;12501:81::o;11696:1552::-;;;;;;;","srcMapRuntime":"11696:1552:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;12356:81;;;:::i;:::-;;;;;;;;;;;;;;;;;;;12969:276;;;;;;;;;;;;;;;;-1:-1:-1;12969:276:0;;;;:::i;:::-;;12356:81;12396:7;12423:6;;;12356:81;:::o;12969:276::-;12729:6;;;;12715:10;:20;12707:65;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;13066:22:::1;::::0;::::1;13044:110;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;13191:6;::::0;13170:38:::1;::::0;;13191:6:::1;::::0;;::::1;13170:38:::0;;;;::::1;;::::0;::::1;::::0;;;::::1;::::0;;;;;;;;::::1;13219:18;13228:8;13219;:18::i;:::-;12969:276:::0;:::o;12501:81::-;12557:6;:17;;;;;;;;;;;;;;;12501:81::o","abiDefinition":[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{},"notice":"The Ownable contract has an owner address, and provides basic authorization control functions","version":1},"developerDoc":{"details":"Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol Modifications: 1. Consolidate OwnableStorage into this contract (7/13/18) 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20) 3. Make public functions external (5/27/20)","events":{"OwnershipTransferred(address,address)":{"details":"Event to show ownership has been transferred","params":{"newOwner":"representing the address of the new owner","previousOwner":"representing the address of the previous owner"}}},"kind":"dev","methods":{"constructor":{"details":"The constructor sets the original owner of the contract to the sender account."},"owner()":{"details":"Tells the address of the owner","returns":{"_0":"the address of the owner"}},"transferOwnership(address)":{"details":"Allows the current owner to transfer control of the contract to a newOwner.","params":{"newOwner":"The address to transfer ownership to."}}},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol Modifications: 1. Consolidate OwnableStorage into this contract (7/13/18) 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20) 3. Make public functions external (5/27/20)\",\"events\":{\"OwnershipTransferred(address,address)\":{\"details\":\"Event to show ownership has been transferred\",\"params\":{\"newOwner\":\"representing the address of the new owner\",\"previousOwner\":\"representing the address of the previous owner\"}}},\"kind\":\"dev\",\"methods\":{\"constructor\":{\"details\":\"The constructor sets the original owner of the contract to the sender account.\"},\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"notice\":\"The Ownable contract has an owner address, and provides basic authorization control functions\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"Ownable\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"owner()":"8da5cb5b","transferOwnership(address)":"f2fde38b"}},"/solidity/FiatToken.sol:Pausable":{"code":"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","runtime-code":"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File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"15201:1310:0:-:0;;;15363:26;;;-1:-1:-1;;;;15363:26:0;;;15201:1310;;;;;;;;;-1:-1:-1;12217:20:0;12226:10;12217:8;:20::i;:::-;15201:1310;;12501:81;12557:6;:17;;-1:-1:-1;;;;;;12557:17:0;-1:-1:-1;;;;;12557:17:0;;;;;;;;;;12501:81::o;15201:1310::-;;;;;;;","srcMapRuntime":"15201:1310:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;16088:97;;;:::i;:::-;;16247:261;;;;;;;;;;;;;;;;-1:-1:-1;16247:261:0;;;;:::i;15363:26::-;;;:::i;:::-;;;;;;;;;;;;;;;;;;15901:92;;;:::i;12356:81::-;;;:::i;:::-;;;;;;;;;;;;;;;;;;;15335:21;;;:::i;12969:276::-;;;;;;;;;;;;;;;;-1:-1:-1;12969:276:0;;;;:::i;16088:97::-;15744:6;;;;15730:10;:20;15722:67;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;16138:6:::1;:14:::0;;;::::1;::::0;;16168:9:::1;::::0;::::1;::::0;16147:5:::1;::::0;16168:9:::1;16088:97::o:0;16247:261::-;12729:6;;;;12715:10;:20;12707:65;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;16341:24:::1;::::0;::::1;16319:114;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;16444:6;:19:::0;;;::::1;;::::0;;::::1;::::0;;;::::1;::::0;;;;16479:21:::1;::::0;16493:6;::::1;::::0;16479:21:::1;::::0;-1:-1:-1;;16479:21:0::1;16247:261:::0;:::o;15363:26::-;;;;;;;;;:::o;15901:92::-;15744:6;;;;15730:10;:20;15722:67;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;15958:4:::1;15949:13:::0;;;::::1;::::0;::::1;::::0;;15978:7:::1;::::0;::::1;::::0;15949:13;;15978:7:::1;15901:92::o:0;12356:81::-;12396:7;12423:6;;;12356:81;:::o;15335:21::-;;;;;;:::o;12969:276::-;12729:6;;;;12715:10;:20;12707:65;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;13066:22:::1;::::0;::::1;13044:110;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;13191:6;::::0;13170:38:::1;::::0;;13191:6:::1;::::0;;::::1;13170:38:::0;;;;::::1;;::::0;::::1;::::0;;;::::1;::::0;;;;;;;;::::1;13219:18;13228:8;13219;:18::i;:::-;12969:276:::0;:::o;12501:81::-;12557:6;:17;;;;;;;;;;;;;;;12501:81::o","abiDefinition":[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newAddress","type":"address"}],"name":"PauserChanged","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpause","type":"event"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pauser","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newPauser","type":"address"}],"name":"updatePauser","outputs":[],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{},"notice":"Base contract which allows children to implement an emergency stop mechanism","version":1},"developerDoc":{"details":"Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol Modifications: 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018) 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018) 3. Removed whenPaused (6/14/2018) 4. Switches ownable library to use ZeppelinOS (7/12/18) 5. Remove constructor (7/13/18) 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20) 7. Make public functions external (5/27/20)","kind":"dev","methods":{"owner()":{"details":"Tells the address of the owner","returns":{"_0":"the address of the owner"}},"pause()":{"details":"called by the owner to pause, triggers stopped state"},"transferOwnership(address)":{"details":"Allows the current owner to transfer control of the contract to a newOwner.","params":{"newOwner":"The address to transfer ownership to."}},"unpause()":{"details":"called by the owner to unpause, returns to normal state"},"updatePauser(address)":{"details":"update the pauser role"}},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Pause\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newAddress\",\"type\":\"address\"}],\"name\":\"PauserChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Unpause\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"paused\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"pauser\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"unpause\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newPauser\",\"type\":\"address\"}],\"name\":\"updatePauser\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol Modifications: 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018) 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018) 3. Removed whenPaused (6/14/2018) 4. Switches ownable library to use ZeppelinOS (7/12/18) 5. Remove constructor (7/13/18) 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20) 7. Make public functions external (5/27/20)\",\"kind\":\"dev\",\"methods\":{\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"pause()\":{\"details\":\"called by the owner to pause, triggers stopped state\"},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}},\"unpause()\":{\"details\":\"called by the owner to unpause, returns to normal state\"},\"updatePauser(address)\":{\"details\":\"update the pauser role\"}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"notice\":\"Base contract which allows children to implement an emergency stop mechanism\",\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"Pausable\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"owner()":"8da5cb5b","pause()":"8456cb59","paused()":"5c975abb","pauser()":"9fd0506d","transferOwnership(address)":"f2fde38b","unpause()":"3f4ba83a","updatePauser(address)":"554bab3c"}},"/solidity/FiatToken.sol:Rescuable":{"code":"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File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, 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IERC20","name":"tokenContract","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rescuer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newRescuer","type":"address"}],"name":"updateRescuer","outputs":[],"stateMutability":"nonpayable","type":"function"}],"userDoc":{"kind":"user","methods":{"rescueERC20(address,address,uint256)":{"notice":"Rescue ERC20 tokens locked up in this contract."},"rescuer()":{"notice":"Returns current rescuer"},"updateRescuer(address)":{"notice":"Assign the rescuer role to a given address."}},"version":1},"developerDoc":{"kind":"dev","methods":{"owner()":{"details":"Tells the address of the owner","returns":{"_0":"the address of the owner"}},"rescueERC20(address,address,uint256)":{"params":{"amount":"Amount to withdraw","to":"Recipient address","tokenContract":"ERC20 token contract address"}},"rescuer()":{"returns":{"_0":"Rescuer's address"}},"transferOwnership(address)":{"details":"Allows the current owner to transfer control of the contract to a newOwner.","params":{"newOwner":"The address to transfer ownership to."}},"updateRescuer(address)":{"params":{"newRescuer":"New rescuer's address"}}},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"RescuerChanged\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"contract IERC20\",\"name\":\"tokenContract\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"rescueERC20\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"rescuer\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newRescuer\",\"type\":\"address\"}],\"name\":\"updateRescuer\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{\"owner()\":{\"details\":\"Tells the address of the owner\",\"returns\":{\"_0\":\"the address of the owner\"}},\"rescueERC20(address,address,uint256)\":{\"params\":{\"amount\":\"Amount to withdraw\",\"to\":\"Recipient address\",\"tokenContract\":\"ERC20 token contract address\"}},\"rescuer()\":{\"returns\":{\"_0\":\"Rescuer's address\"}},\"transferOwnership(address)\":{\"details\":\"Allows the current owner to transfer control of the contract to a newOwner.\",\"params\":{\"newOwner\":\"The address to transfer ownership to.\"}},\"updateRescuer(address)\":{\"params\":{\"newRescuer\":\"New rescuer's address\"}}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{\"rescueERC20(address,address,uint256)\":{\"notice\":\"Rescue ERC20 tokens locked up in this contract.\"},\"rescuer()\":{\"notice\":\"Returns current rescuer\"},\"updateRescuer(address)\":{\"notice\":\"Assign the rescuer role to a given address.\"}},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"Rescuable\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{"owner()":"8da5cb5b","rescueERC20(address,address,uint256)":"b2118a8d","rescuer()":"38a63183","transferOwnership(address)":"f2fde38b","updateRescuer(address)":"2ab60045"}},"/solidity/FiatToken.sol:SafeERC20":{"code":"0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122063de8906fd953f7580985f2cad22d44e106fa278908768815f85a86d6644e1d064736f6c634300060c0033","runtime-code":"0x73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122063de8906fd953f7580985f2cad22d44e106fa278908768815f85a86d6644e1d064736f6c634300060c0033","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"38728:3831:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;","srcMapRuntime":"38728:3831:0:-:0;;;;;;;;","abiDefinition":[],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"details":"Wrappers around ERC20 operations that throw on failure (when the token contract returns false). Tokens that return no value (and instead revert or throw on failure) are also supported, non-reverting calls are assumed to be successful. To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, which allows you to call the safe operations as `token.safeTransfer(...)`, etc.","kind":"dev","methods":{},"title":"SafeERC20","version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"Wrappers around ERC20 operations that throw on failure (when the token contract returns false). Tokens that return no value (and instead revert or throw on failure) are also supported, non-reverting calls are assumed to be successful. To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\",\"kind\":\"dev\",\"methods\":{},\"title\":\"SafeERC20\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"SafeERC20\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{}},"/solidity/FiatToken.sol:SafeMath":{"code":"0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220309cc7eee0a2e27894f2d1c22a27c61aa20fdabf8362a7ed74a516c6ece85f3c64736f6c634300060c0033","runtime-code":"0x73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220309cc7eee0a2e27894f2d1c22a27c61aa20fdabf8362a7ed74a516c6ece85f3c64736f6c634300060c0033","info":{"source":"// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003c= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b \u003e 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(\r\n        uint256 a,\r\n        uint256 b,\r\n        string memory errorMessage\r\n    ) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount)\r\n        external\r\n        returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        view\r\n        returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(\r\n        address sender,\r\n        address recipient,\r\n        uint256 amount\r\n    ) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(\r\n        address indexed owner,\r\n        address indexed spender,\r\n        uint256 value\r\n    );\r\n}\r\n\r\n// File: contracts/v1/AbstractFiatTokenV1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV1 is IERC20 {\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal virtual;\r\n\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/v1/Ownable.sol\r\n\r\n/**\r\n * Copyright (c) 2018 zOS Global Limited.\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice The Ownable contract has an owner address, and provides basic\r\n * authorization control functions\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol\r\n * Modifications:\r\n * 1. Consolidate OwnableStorage into this contract (7/13/18)\r\n * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)\r\n * 3. Make public functions external (5/27/20)\r\n */\r\ncontract Ownable {\r\n    // Owner of the contract\r\n    address private _owner;\r\n\r\n    /**\r\n     * @dev Event to show ownership has been transferred\r\n     * @param previousOwner representing the address of the previous owner\r\n     * @param newOwner representing the address of the new owner\r\n     */\r\n    event OwnershipTransferred(address previousOwner, address newOwner);\r\n\r\n    /**\r\n     * @dev The constructor sets the original owner of the contract to the sender account.\r\n     */\r\n    constructor() public {\r\n        setOwner(msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @dev Tells the address of the owner\r\n     * @return the address of the owner\r\n     */\r\n    function owner() external view returns (address) {\r\n        return _owner;\r\n    }\r\n\r\n    /**\r\n     * @dev Sets a new owner address\r\n     */\r\n    function setOwner(address newOwner) internal {\r\n        _owner = newOwner;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the owner.\r\n     */\r\n    modifier onlyOwner() {\r\n        require(msg.sender == _owner, \"Ownable: caller is not the owner\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Allows the current owner to transfer control of the contract to a newOwner.\r\n     * @param newOwner The address to transfer ownership to.\r\n     */\r\n    function transferOwnership(address newOwner) external onlyOwner {\r\n        require(\r\n            newOwner != address(0),\r\n            \"Ownable: new owner is the zero address\"\r\n        );\r\n        emit OwnershipTransferred(_owner, newOwner);\r\n        setOwner(newOwner);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Pausable.sol\r\n\r\n/**\r\n * Copyright (c) 2016 Smart Contract Solutions, Inc.\r\n * Copyright (c) 2018-2020 CENTRE SECZ0\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @notice Base contract which allows children to implement an emergency stop\r\n * mechanism\r\n * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol\r\n * Modifications:\r\n * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)\r\n * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)\r\n * 3. Removed whenPaused (6/14/2018)\r\n * 4. Switches ownable library to use ZeppelinOS (7/12/18)\r\n * 5. Remove constructor (7/13/18)\r\n * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)\r\n * 7. Make public functions external (5/27/20)\r\n */\r\ncontract Pausable is Ownable {\r\n    event Pause();\r\n    event Unpause();\r\n    event PauserChanged(address indexed newAddress);\r\n\r\n    address public pauser;\r\n    bool public paused = false;\r\n\r\n    /**\r\n     * @dev Modifier to make a function callable only when the contract is not paused.\r\n     */\r\n    modifier whenNotPaused() {\r\n        require(!paused, \"Pausable: paused\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev throws if called by any account other than the pauser\r\n     */\r\n    modifier onlyPauser() {\r\n        require(msg.sender == pauser, \"Pausable: caller is not the pauser\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to pause, triggers stopped state\r\n     */\r\n    function pause() external onlyPauser {\r\n        paused = true;\r\n        emit Pause();\r\n    }\r\n\r\n    /**\r\n     * @dev called by the owner to unpause, returns to normal state\r\n     */\r\n    function unpause() external onlyPauser {\r\n        paused = false;\r\n        emit Unpause();\r\n    }\r\n\r\n    /**\r\n     * @dev update the pauser role\r\n     */\r\n    function updatePauser(address _newPauser) external onlyOwner {\r\n        require(\r\n            _newPauser != address(0),\r\n            \"Pausable: new pauser is the zero address\"\r\n        );\r\n        pauser = _newPauser;\r\n        emit PauserChanged(pauser);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/Blacklistable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title Blacklistable Token\r\n * @dev Allows accounts to be blacklisted by a \"blacklister\" role\r\n */\r\ncontract Blacklistable is Ownable {\r\n    address public blacklister;\r\n    mapping(address =\u003e bool) internal blacklisted;\r\n\r\n    event Blacklisted(address indexed _account);\r\n    event UnBlacklisted(address indexed _account);\r\n    event BlacklisterChanged(address indexed newBlacklister);\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the blacklister\r\n     */\r\n    modifier onlyBlacklister() {\r\n        require(\r\n            msg.sender == blacklister,\r\n            \"Blacklistable: caller is not the blacklister\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if argument account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    modifier notBlacklisted(address _account) {\r\n        require(\r\n            !blacklisted[_account],\r\n            \"Blacklistable: account is blacklisted\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is blacklisted\r\n     * @param _account The address to check\r\n     */\r\n    function isBlacklisted(address _account) external view returns (bool) {\r\n        return blacklisted[_account];\r\n    }\r\n\r\n    /**\r\n     * @dev Adds account to blacklist\r\n     * @param _account The address to blacklist\r\n     */\r\n    function blacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = true;\r\n        emit Blacklisted(_account);\r\n    }\r\n\r\n    /**\r\n     * @dev Removes account from blacklist\r\n     * @param _account The address to remove from the blacklist\r\n     */\r\n    function unBlacklist(address _account) external onlyBlacklister {\r\n        blacklisted[_account] = false;\r\n        emit UnBlacklisted(_account);\r\n    }\r\n\r\n    function updateBlacklister(address _newBlacklister) external onlyOwner {\r\n        require(\r\n            _newBlacklister != address(0),\r\n            \"Blacklistable: new blacklister is the zero address\"\r\n        );\r\n        blacklister = _newBlacklister;\r\n        emit BlacklisterChanged(blacklister);\r\n    }\r\n}\r\n\r\n// File: contracts/v1/FiatTokenV1.sol\r\n\r\n/**\r\n *\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {\r\n    using SafeMath for uint256;\r\n\r\n    string public name;\r\n    string public symbol;\r\n    uint8 public decimals;\r\n    string public currency;\r\n    address public masterMinter;\r\n    bool internal initialized;\r\n\r\n    mapping(address =\u003e uint256) internal balances;\r\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal allowed;\r\n    uint256 internal totalSupply_ = 0;\r\n    mapping(address =\u003e bool) internal minters;\r\n    mapping(address =\u003e uint256) internal minterAllowed;\r\n\r\n    event Mint(address indexed minter, address indexed to, uint256 amount);\r\n    event Burn(address indexed burner, uint256 amount);\r\n    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);\r\n    event MinterRemoved(address indexed oldMinter);\r\n    event MasterMinterChanged(address indexed newMasterMinter);\r\n\r\n    function initialize(\r\n        string memory tokenName,\r\n        string memory tokenSymbol,\r\n        string memory tokenCurrency,\r\n        uint8 tokenDecimals,\r\n        address newMasterMinter,\r\n        address newPauser,\r\n        address newBlacklister,\r\n        address newOwner\r\n    ) public {\r\n        require(!initialized, \"FiatToken: contract is already initialized\");\r\n        require(\r\n            newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        require(\r\n            newPauser != address(0),\r\n            \"FiatToken: new pauser is the zero address\"\r\n        );\r\n        require(\r\n            newBlacklister != address(0),\r\n            \"FiatToken: new blacklister is the zero address\"\r\n        );\r\n        require(\r\n            newOwner != address(0),\r\n            \"FiatToken: new owner is the zero address\"\r\n        );\r\n\r\n        name = tokenName;\r\n        symbol = tokenSymbol;\r\n        currency = tokenCurrency;\r\n        decimals = tokenDecimals;\r\n        masterMinter = newMasterMinter;\r\n        pauser = newPauser;\r\n        blacklister = newBlacklister;\r\n        setOwner(newOwner);\r\n        initialized = true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than a minter\r\n     */\r\n    modifier onlyMinters() {\r\n        require(minters[msg.sender], \"FiatToken: caller is not a minter\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to mint tokens\r\n     * @param _to The address that will receive the minted tokens.\r\n     * @param _amount The amount of tokens to mint. Must be less than or equal\r\n     * to the minterAllowance of the caller.\r\n     * @return A boolean that indicates if the operation was successful.\r\n     */\r\n    function mint(address _to, uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(_to)\r\n        returns (bool)\r\n    {\r\n        require(_to != address(0), \"FiatToken: mint to the zero address\");\r\n        require(_amount \u003e 0, \"FiatToken: mint amount not greater than 0\");\r\n\r\n        uint256 mintingAllowedAmount = minterAllowed[msg.sender];\r\n        require(\r\n            _amount \u003c= mintingAllowedAmount,\r\n            \"FiatToken: mint amount exceeds minterAllowance\"\r\n        );\r\n\r\n        totalSupply_ = totalSupply_.add(_amount);\r\n        balances[_to] = balances[_to].add(_amount);\r\n        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);\r\n        emit Mint(msg.sender, _to, _amount);\r\n        emit Transfer(address(0), _to, _amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Throws if called by any account other than the masterMinter\r\n     */\r\n    modifier onlyMasterMinter() {\r\n        require(\r\n            msg.sender == masterMinter,\r\n            \"FiatToken: caller is not the masterMinter\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @dev Get minter allowance for an account\r\n     * @param minter The address of the minter\r\n     */\r\n    function minterAllowance(address minter) external view returns (uint256) {\r\n        return minterAllowed[minter];\r\n    }\r\n\r\n    /**\r\n     * @dev Checks if account is a minter\r\n     * @param account The address to check\r\n     */\r\n    function isMinter(address account) external view returns (bool) {\r\n        return minters[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Amount of remaining tokens spender is allowed to transfer on\r\n     * behalf of the token owner\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @return Allowance amount\r\n     */\r\n    function allowance(address owner, address spender)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return allowed[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev Get totalSupply of token\r\n     */\r\n    function totalSupply() external override view returns (uint256) {\r\n        return totalSupply_;\r\n    }\r\n\r\n    /**\r\n     * @dev Get token balance of an account\r\n     * @param account address The account\r\n     */\r\n    function balanceOf(address account)\r\n        external\r\n        override\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return balances[account];\r\n    }\r\n\r\n    /**\r\n     * @notice Set spender's allowance over the caller's tokens to be a given\r\n     * value.\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     * @return True if successful\r\n     */\r\n    function approve(address spender, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _approve(msg.sender, spender, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Internal function to set allowance\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param value     Allowance amount\r\n     */\r\n    function _approve(\r\n        address owner,\r\n        address spender,\r\n        uint256 value\r\n    ) internal override {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n        allowed[owner][spender] = value;\r\n        emit Approval(owner, spender, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens by spending allowance\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    )\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(from)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        require(\r\n            value \u003c= allowed[from][msg.sender],\r\n            \"ERC20: transfer amount exceeds allowance\"\r\n        );\r\n        _transfer(from, to, value);\r\n        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Transfer tokens from the caller\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     * @return True if successful\r\n     */\r\n    function transfer(address to, uint256 value)\r\n        external\r\n        override\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(to)\r\n        returns (bool)\r\n    {\r\n        _transfer(msg.sender, to, value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to process transfers\r\n     * @param from  Payer's address\r\n     * @param to    Payee's address\r\n     * @param value Transfer amount\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal override {\r\n        require(from != address(0), \"ERC20: transfer from the zero address\");\r\n        require(to != address(0), \"ERC20: transfer to the zero address\");\r\n        require(\r\n            value \u003c= balances[from],\r\n            \"ERC20: transfer amount exceeds balance\"\r\n        );\r\n\r\n        balances[from] = balances[from].sub(value);\r\n        balances[to] = balances[to].add(value);\r\n        emit Transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @dev Function to add/update a new minter\r\n     * @param minter The address of the minter\r\n     * @param minterAllowedAmount The minting amount allowed for the minter\r\n     * @return True if the operation was successful.\r\n     */\r\n    function configureMinter(address minter, uint256 minterAllowedAmount)\r\n        external\r\n        whenNotPaused\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = true;\r\n        minterAllowed[minter] = minterAllowedAmount;\r\n        emit MinterConfigured(minter, minterAllowedAmount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Function to remove a minter\r\n     * @param minter The address of the minter to remove\r\n     * @return True if the operation was successful.\r\n     */\r\n    function removeMinter(address minter)\r\n        external\r\n        onlyMasterMinter\r\n        returns (bool)\r\n    {\r\n        minters[minter] = false;\r\n        minterAllowed[minter] = 0;\r\n        emit MinterRemoved(minter);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev allows a minter to burn some of its own tokens\r\n     * Validates that caller is a minter and that sender is not blacklisted\r\n     * amount is less than or equal to the minter's account balance\r\n     * @param _amount uint256 the amount of tokens to be burned\r\n     */\r\n    function burn(uint256 _amount)\r\n        external\r\n        whenNotPaused\r\n        onlyMinters\r\n        notBlacklisted(msg.sender)\r\n    {\r\n        uint256 balance = balances[msg.sender];\r\n        require(_amount \u003e 0, \"FiatToken: burn amount not greater than 0\");\r\n        require(balance \u003e= _amount, \"FiatToken: burn amount exceeds balance\");\r\n\r\n        totalSupply_ = totalSupply_.sub(_amount);\r\n        balances[msg.sender] = balance.sub(_amount);\r\n        emit Burn(msg.sender, _amount);\r\n        emit Transfer(msg.sender, address(0), _amount);\r\n    }\r\n\r\n    function updateMasterMinter(address _newMasterMinter) external onlyOwner {\r\n        require(\r\n            _newMasterMinter != address(0),\r\n            \"FiatToken: new masterMinter is the zero address\"\r\n        );\r\n        masterMinter = _newMasterMinter;\r\n        emit MasterMinterChanged(masterMinter);\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n\r\n            bytes32 accountHash\r\n         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly {\r\n            codehash := extcodehash(account)\r\n        }\r\n        return (codehash != accountHash \u0026\u0026 codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(\r\n            address(this).balance \u003e= amount,\r\n            \"Address: insufficient balance\"\r\n        );\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(\r\n            success,\r\n            \"Address: unable to send value, recipient may have reverted\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a Solidity function call using a low level `call`. A\r\n     * plain`call` is an unsafe replacement for a function call: use this\r\n     * function instead.\r\n     *\r\n     * If `target` reverts with a revert reason, it is bubbled up by this\r\n     * function (like regular Solidity function calls).\r\n     *\r\n     * Returns the raw returned data. To convert to the expected return value,\r\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `target` must be a contract.\r\n     * - calling `target` with `data` must not revert.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(address target, bytes memory data)\r\n        internal\r\n        returns (bytes memory)\r\n    {\r\n        return functionCall(target, data, \"Address: low-level call failed\");\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n     * `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCall(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        return _functionCallWithValue(target, data, 0, errorMessage);\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n     * but also transferring `value` wei to `target`.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the calling contract must have an ETH balance of at least `value`.\r\n     * - the called Solidity function must be `payable`.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value\r\n    ) internal returns (bytes memory) {\r\n        return\r\n            functionCallWithValue(\r\n                target,\r\n                data,\r\n                value,\r\n                \"Address: low-level call with value failed\"\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n     *\r\n     * _Available since v3.1._\r\n     */\r\n    function functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 value,\r\n        string memory errorMessage\r\n    ) internal returns (bytes memory) {\r\n        require(\r\n            address(this).balance \u003e= value,\r\n            \"Address: insufficient balance for call\"\r\n        );\r\n        return _functionCallWithValue(target, data, value, errorMessage);\r\n    }\r\n\r\n    function _functionCallWithValue(\r\n        address target,\r\n        bytes memory data,\r\n        uint256 weiValue,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        require(isContract(target), \"Address: call to non-contract\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.call{\r\n            value: weiValue\r\n        }(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    function safeTransfer(\r\n        IERC20 token,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transfer.selector, to, value)\r\n        );\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        IERC20 token,\r\n        address from,\r\n        address to,\r\n        uint256 value\r\n    ) internal {\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Deprecated. This function has issues similar to the ones found in\r\n     * {IERC20-approve}, and its usage is discouraged.\r\n     *\r\n     * Whenever possible, use {safeIncreaseAllowance} and\r\n     * {safeDecreaseAllowance} instead.\r\n     */\r\n    function safeApprove(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        // safeApprove should only be called when setting an initial allowance,\r\n        // or when resetting it to zero. To increase and decrease it, use\r\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n        // solhint-disable-next-line max-line-length\r\n        require(\r\n            (value == 0) || (token.allowance(address(this), spender) == 0),\r\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(token.approve.selector, spender, value)\r\n        );\r\n    }\r\n\r\n    function safeIncreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).add(\r\n            value\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    function safeDecreaseAllowance(\r\n        IERC20 token,\r\n        address spender,\r\n        uint256 value\r\n    ) internal {\r\n        uint256 newAllowance = token.allowance(address(this), spender).sub(\r\n            value,\r\n            \"SafeERC20: decreased allowance below zero\"\r\n        );\r\n        _callOptionalReturn(\r\n            token,\r\n            abi.encodeWithSelector(\r\n                token.approve.selector,\r\n                spender,\r\n                newAllowance\r\n            )\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n     * @param token The token targeted by the call.\r\n     * @param data The call data (encoded using abi.encode or one of its variants).\r\n     */\r\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n        // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n        bytes memory returndata = address(token).functionCall(\r\n            data,\r\n            \"SafeERC20: low-level call failed\"\r\n        );\r\n        if (returndata.length \u003e 0) {\r\n            // Return data is optional\r\n            // solhint-disable-next-line max-line-length\r\n            require(\r\n                abi.decode(returndata, (bool)),\r\n                \"SafeERC20: ERC20 operation did not succeed\"\r\n            );\r\n        }\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/Rescuable.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\ncontract Rescuable is Ownable {\r\n    using SafeERC20 for IERC20;\r\n\r\n    address private _rescuer;\r\n\r\n    event RescuerChanged(address indexed newRescuer);\r\n\r\n    /**\r\n     * @notice Returns current rescuer\r\n     * @return Rescuer's address\r\n     */\r\n    function rescuer() external view returns (address) {\r\n        return _rescuer;\r\n    }\r\n\r\n    /**\r\n     * @notice Revert if called by any account other than the rescuer.\r\n     */\r\n    modifier onlyRescuer() {\r\n        require(msg.sender == _rescuer, \"Rescuable: caller is not the rescuer\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Rescue ERC20 tokens locked up in this contract.\r\n     * @param tokenContract ERC20 token contract address\r\n     * @param to        Recipient address\r\n     * @param amount    Amount to withdraw\r\n     */\r\n    function rescueERC20(\r\n        IERC20 tokenContract,\r\n        address to,\r\n        uint256 amount\r\n    ) external onlyRescuer {\r\n        tokenContract.safeTransfer(to, amount);\r\n    }\r\n\r\n    /**\r\n     * @notice Assign the rescuer role to a given address.\r\n     * @param newRescuer New rescuer's address\r\n     */\r\n    function updateRescuer(address newRescuer) external onlyOwner {\r\n        require(\r\n            newRescuer != address(0),\r\n            \"Rescuable: new rescuer is the zero address\"\r\n        );\r\n        _rescuer = newRescuer;\r\n        emit RescuerChanged(newRescuer);\r\n    }\r\n}\r\n\r\n// File: contracts/v1.1/FiatTokenV1_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatTokenV1_1\r\n * @dev ERC20 Token backed by fiat reserves\r\n */\r\ncontract FiatTokenV1_1 is FiatTokenV1, Rescuable {\r\n\r\n}\r\n\r\n// File: contracts/v2/AbstractFiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\nabstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal virtual;\r\n\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal virtual;\r\n}\r\n\r\n// File: contracts/util/ECRecover.sol\r\n\r\n/**\r\n * Copyright (c) 2016-2019 zOS Global Limited\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title ECRecover\r\n * @notice A library that provides a safe ECDSA recovery function\r\n */\r\nlibrary ECRecover {\r\n    /**\r\n     * @notice Recover signer's address from a signed message\r\n     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol\r\n     * Modifications: Accept v, r, and s as separate arguments\r\n     * @param digest    Keccak-256 hash digest of the signed message\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     * @return Signer address\r\n     */\r\n    function recover(\r\n        bytes32 digest,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 \u003c s \u003c secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (\r\n            uint256(s) \u003e\r\n            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0\r\n        ) {\r\n            revert(\"ECRecover: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 \u0026\u0026 v != 28) {\r\n            revert(\"ECRecover: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(digest, v, r, s);\r\n        require(signer != address(0), \"ECRecover: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n}\r\n\r\n// File: contracts/util/EIP712.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712\r\n * @notice A library that provides EIP712 helper functions\r\n */\r\nlibrary EIP712 {\r\n    /**\r\n     * @notice Make EIP712 domain separator\r\n     * @param name      Contract name\r\n     * @param version   Contract version\r\n     * @return Domain separator\r\n     */\r\n    function makeDomainSeparator(string memory name, string memory version)\r\n        internal\r\n        view\r\n        returns (bytes32)\r\n    {\r\n        uint256 chainId;\r\n        assembly {\r\n            chainId := chainid()\r\n        }\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    // keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\")\r\n                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,\r\n                    keccak256(bytes(name)),\r\n                    keccak256(bytes(version)),\r\n                    chainId,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n    /**\r\n     * @notice Recover signer's address from a EIP712 signature\r\n     * @param domainSeparator   Domain separator\r\n     * @param v                 v of the signature\r\n     * @param r                 r of the signature\r\n     * @param s                 s of the signature\r\n     * @param typeHashAndData   Type hash concatenated with data\r\n     * @return Signer's address\r\n     */\r\n    function recover(\r\n        bytes32 domainSeparator,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s,\r\n        bytes memory typeHashAndData\r\n    ) internal pure returns (address) {\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                \"\\x19\\x01\",\r\n                domainSeparator,\r\n                keccak256(typeHashAndData)\r\n            )\r\n        );\r\n        return ECRecover.recover(digest, v, r, s);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP712Domain.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP712 Domain\r\n */\r\ncontract EIP712Domain {\r\n    /**\r\n     * @dev EIP712 Domain Separator\r\n     */\r\n    bytes32 public DOMAIN_SEPARATOR;\r\n}\r\n\r\n// File: contracts/v2/EIP3009.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-3009\r\n * @notice Provide internal implementation for gas-abstracted transfers\r\n * @dev Contracts that inherit from this must wrap these with publicly\r\n * accessible functions, optionally adding modifiers where necessary\r\n */\r\nabstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;\r\n\r\n    // keccak256(\"ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)\")\r\n    bytes32\r\n        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;\r\n\r\n    // keccak256(\"CancelAuthorization(address authorizer,bytes32 nonce)\")\r\n    bytes32\r\n        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;\r\n\r\n    /**\r\n     * @dev authorizer address =\u003e nonce =\u003e bool (true if nonce is used)\r\n     */\r\n    mapping(address =\u003e mapping(bytes32 =\u003e bool)) private _authorizationStates;\r\n\r\n    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);\r\n    event AuthorizationCanceled(\r\n        address indexed authorizer,\r\n        bytes32 indexed nonce\r\n    );\r\n\r\n    /**\r\n     * @notice Returns the state of an authorization\r\n     * @dev Nonces are randomly generated 32-byte data unique to the\r\n     * authorizer's address\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @return True if the nonce is used\r\n     */\r\n    function authorizationState(address authorizer, bytes32 nonce)\r\n        external\r\n        view\r\n        returns (bool)\r\n    {\r\n        return _authorizationStates[authorizer][nonce];\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(to == msg.sender, \"FiatTokenV2: caller must be the payee\");\r\n        _requireValidAuthorization(from, nonce, validAfter, validBefore);\r\n\r\n        bytes memory data = abi.encode(\r\n            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _markAuthorizationAsUsed(from, nonce);\r\n        _transfer(from, to, value);\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function _cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n\r\n        bytes memory data = abi.encode(\r\n            CANCEL_AUTHORIZATION_TYPEHASH,\r\n            authorizer,\r\n            nonce\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,\r\n            \"FiatTokenV2: invalid signature\"\r\n        );\r\n\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationCanceled(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Check that an authorization is unused\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\r\n        private\r\n        view\r\n    {\r\n        require(\r\n            !_authorizationStates[authorizer][nonce],\r\n            \"FiatTokenV2: authorization is used or canceled\"\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Check that authorization is valid\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     */\r\n    function _requireValidAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint256 validAfter,\r\n        uint256 validBefore\r\n    ) private view {\r\n        require(\r\n            now \u003e validAfter,\r\n            \"FiatTokenV2: authorization is not yet valid\"\r\n        );\r\n        require(now \u003c validBefore, \"FiatTokenV2: authorization is expired\");\r\n        _requireUnusedAuthorization(authorizer, nonce);\r\n    }\r\n\r\n    /**\r\n     * @notice Mark an authorization as used\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     */\r\n    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)\r\n        private\r\n    {\r\n        _authorizationStates[authorizer][nonce] = true;\r\n        emit AuthorizationUsed(authorizer, nonce);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/EIP2612.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title EIP-2612\r\n * @notice Provide internal implementation for gas-abstracted approvals\r\n */\r\nabstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\r\n    bytes32\r\n        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n\r\n    mapping(address =\u003e uint256) private _permitNonces;\r\n\r\n    /**\r\n     * @notice Nonces for permit\r\n     * @param owner Token owner's address (Authorizer)\r\n     * @return Next nonce\r\n     */\r\n    function nonces(address owner) external view returns (uint256) {\r\n        return _permitNonces[owner];\r\n    }\r\n\r\n    /**\r\n     * @notice Verify a signed approval permit and execute if valid\r\n     * @param owner     Token owner's address (Authorizer)\r\n     * @param spender   Spender's address\r\n     * @param value     Amount of allowance\r\n     * @param deadline  The time at which this expires (unix time)\r\n     * @param v         v of the signature\r\n     * @param r         r of the signature\r\n     * @param s         s of the signature\r\n     */\r\n    function _permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) internal {\r\n        require(deadline \u003e= now, \"FiatTokenV2: permit is expired\");\r\n\r\n        bytes memory data = abi.encode(\r\n            PERMIT_TYPEHASH,\r\n            owner,\r\n            spender,\r\n            value,\r\n            _permitNonces[owner]++,\r\n            deadline\r\n        );\r\n        require(\r\n            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,\r\n            \"EIP2612: invalid signature\"\r\n        );\r\n\r\n        _approve(owner, spender, value);\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n/**\r\n * @title FiatToken V2\r\n * @notice ERC20 Token backed by fiat reserves, version 2\r\n */\r\ncontract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {\r\n    uint8 internal _initializedVersion;\r\n\r\n    /**\r\n     * @notice Initialize v2\r\n     * @param newName   New token name\r\n     */\r\n    function initializeV2(string calldata newName) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(initialized \u0026\u0026 _initializedVersion == 0);\r\n        name = newName;\r\n        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, \"2\");\r\n        _initializedVersion = 1;\r\n    }\r\n\r\n    /**\r\n     * @notice Increase the allowance by a given increment\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase in allowance\r\n     * @return True if successful\r\n     */\r\n    function increaseAllowance(address spender, uint256 increment)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _increaseAllowance(msg.sender, spender, increment);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Decrease the allowance by a given decrement\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease in allowance\r\n     * @return True if successful\r\n     */\r\n    function decreaseAllowance(address spender, uint256 decrement)\r\n        external\r\n        whenNotPaused\r\n        notBlacklisted(msg.sender)\r\n        notBlacklisted(spender)\r\n        returns (bool)\r\n    {\r\n        _decreaseAllowance(msg.sender, spender, decrement);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @notice Execute a transfer with a signed authorization\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function transferWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _transferWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Receive a transfer with a signed authorization from the payer\r\n     * @dev This has an additional check to ensure that the payee's address\r\n     * matches the caller of this function to prevent front-running attacks.\r\n     * @param from          Payer's address (Authorizer)\r\n     * @param to            Payee's address\r\n     * @param value         Amount to be transferred\r\n     * @param validAfter    The time after which this is valid (unix time)\r\n     * @param validBefore   The time before which this is valid (unix time)\r\n     * @param nonce         Unique nonce\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function receiveWithAuthorization(\r\n        address from,\r\n        address to,\r\n        uint256 value,\r\n        uint256 validAfter,\r\n        uint256 validBefore,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {\r\n        _receiveWithAuthorization(\r\n            from,\r\n            to,\r\n            value,\r\n            validAfter,\r\n            validBefore,\r\n            nonce,\r\n            v,\r\n            r,\r\n            s\r\n        );\r\n    }\r\n\r\n    /**\r\n     * @notice Attempt to cancel an authorization\r\n     * @dev Works only if the authorization is not yet used.\r\n     * @param authorizer    Authorizer's address\r\n     * @param nonce         Nonce of the authorization\r\n     * @param v             v of the signature\r\n     * @param r             r of the signature\r\n     * @param s             s of the signature\r\n     */\r\n    function cancelAuthorization(\r\n        address authorizer,\r\n        bytes32 nonce,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused {\r\n        _cancelAuthorization(authorizer, nonce, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Update allowance with a signed permit\r\n     * @param owner       Token owner's address (Authorizer)\r\n     * @param spender     Spender's address\r\n     * @param value       Amount of allowance\r\n     * @param deadline    Expiration time, seconds since the epoch\r\n     * @param v           v of the signature\r\n     * @param r           r of the signature\r\n     * @param s           s of the signature\r\n     */\r\n    function permit(\r\n        address owner,\r\n        address spender,\r\n        uint256 value,\r\n        uint256 deadline,\r\n        uint8 v,\r\n        bytes32 r,\r\n        bytes32 s\r\n    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {\r\n        _permit(owner, spender, value, deadline, v, r, s);\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to increase the allowance by a given increment\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param increment Amount of increase\r\n     */\r\n    function _increaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 increment\r\n    ) internal override {\r\n        _approve(owner, spender, allowed[owner][spender].add(increment));\r\n    }\r\n\r\n    /**\r\n     * @notice Internal function to decrease the allowance by a given decrement\r\n     * @param owner     Token owner's address\r\n     * @param spender   Spender's address\r\n     * @param decrement Amount of decrease\r\n     */\r\n    function _decreaseAllowance(\r\n        address owner,\r\n        address spender,\r\n        uint256 decrement\r\n    ) internal override {\r\n        _approve(\r\n            owner,\r\n            spender,\r\n            allowed[owner][spender].sub(\r\n                decrement,\r\n                \"ERC20: decreased allowance below zero\"\r\n            )\r\n        );\r\n    }\r\n}\r\n\r\n// File: contracts/v2/FiatTokenV2_1.sol\r\n\r\n/**\r\n * Copyright (c) 2018-2020 CENTRE SECZ\r\n *\r\n * Permission is hereby granted, free of charge, to any person obtaining a copy\r\n * of this software and associated documentation files (the \"Software\"), to deal\r\n * in the Software without restriction, including without limitation the rights\r\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r\n * copies of the Software, and to permit persons to whom the Software is\r\n * furnished to do so, subject to the following conditions:\r\n *\r\n * The above copyright notice and this permission notice shall be included in\r\n * copies or substantial portions of the Software.\r\n *\r\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r\n * SOFTWARE.\r\n */\r\n\r\npragma solidity 0.6.12;\r\n\r\n// solhint-disable func-name-mixedcase\r\n\r\n/**\r\n * @title FiatToken V2.1\r\n * @notice ERC20 Token backed by fiat reserves, version 2.1\r\n */\r\ncontract FiatTokenV2_1 is FiatTokenV2 {\r\n    /**\r\n     * @notice Initialize v2.1\r\n     * @param lostAndFound  The address to which the locked funds are sent\r\n     */\r\n    function initializeV2_1(address lostAndFound) external {\r\n        // solhint-disable-next-line reason-string\r\n        require(_initializedVersion == 1);\r\n\r\n        uint256 lockedAmount = balances[address(this)];\r\n        if (lockedAmount \u003e 0) {\r\n            _transfer(address(this), lostAndFound, lockedAmount);\r\n        }\r\n        blacklisted[address(this)] = true;\r\n\r\n        _initializedVersion = 2;\r\n    }\r\n\r\n    /**\r\n     * @notice Version string for the EIP712 domain separator\r\n     * @return Version string\r\n     */\r\n    function version() external view returns (string memory) {\r\n        return \"2\";\r\n    }\r\n}","language":"Solidity","languageVersion":"0.6.12","compilerVersion":"0.6.12","compilerOptions":"--combined-json bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata,hashes --optimize --optimize-runs 10000000 --allow-paths ., ./, ../","srcMap":"693:4821:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;","srcMapRuntime":"693:4821:0:-:0;;;;;;;;","abiDefinition":[],"userDoc":{"kind":"user","methods":{},"version":1},"developerDoc":{"details":"Wrappers over Solidity's arithmetic operations with added overflow checks. Arithmetic operations in Solidity wrap on overflow. This can easily result in bugs, because programmers usually assume that an overflow raises an error, which is the standard behavior in high level programming languages. `SafeMath` restores this intuition by reverting the transaction when an operation overflows. Using this library instead of the unchecked operations eliminates an entire class of bugs, so it's recommended to use it always.","kind":"dev","methods":{},"version":1},"metadata":"{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"Wrappers over Solidity's arithmetic operations with added overflow checks. Arithmetic operations in Solidity wrap on overflow. This can easily result in bugs, because programmers usually assume that an overflow raises an error, which is the standard behavior in high level programming languages. `SafeMath` restores this intuition by reverting the transaction when an operation overflows. Using this library instead of the unchecked operations eliminates an entire class of bugs, so it's recommended to use it always.\",\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/solidity/FiatToken.sol\":\"SafeMath\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000000},\"remappings\":[]},\"sources\":{\"/solidity/FiatToken.sol\":{\"keccak256\":\"0xa39144f312bcc0f8b6362443fcbb13fb178153decb5b5770579d4de89a551f4a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://902401f5efd835f7b9d5be0c16c7f3616623f0be75174149e6624995e14581c9\",\"dweb:/ipfs/QmZNvq9VDQjHELUujzV4vuRFsfF5vNitzWj4ELi6QiXUB2\"]}},\"version\":1}"},"hashes":{}}}