kleros/kleros-v2

// SPDX-License-Identifier: MIT

pragma solidity 0.8.24;

interface RNG {
    /// @dev Request a random number.
    /// @param _block Block linked to the request.
    function requestRandomness(uint256 _block) external;

    /// @dev Receive the random number.
    /// @param _block Block the random number is linked to.
    /// @return randomNumber Random Number. If the number is not ready or has not been required 0 instead.
    function receiveRandomness(uint256 _block) external returns (uint256 randomNumber);
}