async createVault (createVault: CreateVault, changeScript: Script): Promise<TransactionSegWit> {
    const creationFee = this.network.name === 'mainnet' ? new BigNumber('2') : new BigNumber('1')

    return await super.createDeFiTx(
      OP_CODES.OP_DEFI_TX_CREATE_VAULT(createVault),