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   - function _implementation()    - function _delegate(address implementa ...    - function _willFallback()    - function _fallback()  contract UpgradeableProxy is Proxy    - function _implementation()    - function _upgradeTo(address newImplem ...    - function _setImplementation(address n ...    - function isContract(address account) interface ICashier    - function getPayee()    - function calcFee(address addr, uint8 ...  contract Chargeable    - function sendFee(bytes4 func)    - function _getCashier()    - function _setCashier(address addr)  contract ManagedProxy is Upgradeab ...    - function getProxyAdmin()    - function getProxyImplementation()    - function changeAdmin(address newAdmin ...    - function upgradeTo(address newImpleme ...    - function upgradeToAndCall(address new ...    - function _admin()    - function _setAdmin(address newAdmin)    - function _willFallback()  contract YFIBCProxy is ManagedProx ... *

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/**
 *Submitted for verification at Etherscan.io on 2020-09-26
*/

// SPDX-License-Identifier: MIT

// File: contracts/proxy/Proxy.sol

pragma solidity >=0.6 <0.7.0;

/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
abstract contract Proxy {
    /**
     * @dev Fallback function.
     * Implemented entirely in `_fallback`.
     */
    fallback () payable external {
        _fallback();
    }

    /**
     * @dev Receive function.
     * Implemented entirely in `_fallback`.
     */
    receive () payable external {
        _fallback();
    }

    /**
     * @return The Address of the implementation.
     */
    function _implementation() internal virtual view returns (address);

    /**
     * @dev Delegates execution to an implementation contract.
     * This is a low level function that doesn't return to its internal call site.
     * It will return to the external caller whatever the implementation returns.
     * @param implementation Address to delegate.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }

    /**
     * @dev Function that is run as the first thing in the fallback function.
     * Can be redefined in derived contracts to add functionality.
     * Redefinitions must call super._willFallback().
     */
    function _willFallback() internal virtual {
    }

    /**
     * @dev fallback implementation.
     * Extracted to enable manual triggering.
     */
    function _fallback() internal {
        _willFallback();
        _delegate(_implementation());
    }
}

// File: contracts/proxy/UpgradeableProxy.sol

pragma solidity >=0.6 <0.7.0;


/**
 * @title UpgradeableProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Contract constructor.
     * @param _logic Address of the initial implementation.
     * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
     * It should include the signature and the parameters of the function to be called, as described in
     * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
     * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
     */
    constructor(address _logic, bytes memory _data) public payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }  

    /**
     * @dev Emitted when the implementation is upgraded.
     * @param implementation Address of the new implementation.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation.
     * @return impl Address of the current implementation
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }

    /**
     * @dev Upgrades the proxy to a new implementation.
     * @param newImplementation Address of the new implementation.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Sets the implementation address of the proxy.
     * @param newImplementation Address of the new implementation.
     */
    function _setImplementation(address newImplementation) internal {
        require(isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");

        bytes32 slot = _IMPLEMENTATION_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }

    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

// File: contracts/utils/ICashier.sol

pragma solidity >=0.6 <0.7.0;

interface ICashier {
    function getPayee() external view returns (address payable);
    function calcFee(address addr, uint8 kind, bytes4 func) external view returns (uint256);
}

// File: contracts/utils/Chargeable.sol

pragma solidity >=0.6 <0.7.0;


contract Chargeable {
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier AfterCharge() {
        sendFee(ZERO_SIG);
        _;
    }

    function sendFee(bytes4 func) internal {
        if (func == ZERO_SIG) {
            func = msg.sig;
        }
        address cashier = _getCashier();
        if (address(cashier) == address(0x0)) {
            return;
        }
        address payable payee = ICashier(cashier).getPayee();
        if (payee == address(0x0)) {
            return;
        }
        uint256 fee = ICashier(cashier).calcFee(address(this), 1, func);
        if (fee > 0) {
            payee.transfer(fee);
        }
    }

    bytes4 internal constant ZERO_SIG = 0x00000000;
    /**
     * @dev Storage slot with the address of the cashier contract.
     * This is the keccak-256 hash of "x.cashier.contract" and is validated in the constructor.
     */
    bytes32
        internal constant _CASHIER_SLOT = 0xe4daccb11a797004e79d649410b00658e14f3296aae1b244a00c23be3d595cd4;

    /**
     * @dev Returns the current cashier contract address.
     */
    function _getCashier() internal view returns (address cashier) {
        bytes32 slot = _CASHIER_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            cashier := sload(slot)
        }
    }

    /**
     * @dev Stores a new address in the cashier slot.
     */
    function _setCashier(address addr) internal {
        // zero address is enabled, which means not chargeable
        bytes32 slot = _CASHIER_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, addr)
        }
    }
}

// File: contracts/proxy/ManagedProxy.sol

pragma solidity >=0.6 <0.7.0;



/**
 * @title ManagedProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract ManagedProxy is UpgradeableProxy, Chargeable {
    /**
     * Contract constructor.
     * @param _logic address of the initial implementation.
     * @param _cashier address of the cashier contract.
     * @param _admin Address of the proxy administrator.
     * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
     * It should include the signature and the parameters of the function to be called, as described in
     * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
     * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
     */
    constructor(address _logic, address _cashier, address _admin, bytes memory _data) public payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(_admin);
        _setCashier(_cashier);
    }

    /**
     * @dev Emitted when the administration has been transferred.
     * @param previousAdmin Address of the previous admin.
     * @param newAdmin Address of the new admin.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */

    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Modifier to check whether the `msg.sender` is the admin.
     * If it is, it will run the function. Otherwise, it will delegate the call
     * to the implementation.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * @return The address of the proxy admin.
     */
    function getProxyAdmin() public view returns (address) {
        return _admin();
    }

    /**
     * @return The address of the implementation.
     */
    function getProxyImplementation() public view returns (address) {
        return _implementation();
    }

    /**
     * @dev Changes the admin of the proxy.
     * Only the current admin can call this function.
     * @param newAdmin Address to transfer proxy administration to.
     */
    function changeAdmin(address newAdmin) external payable ifAdmin AfterCharge {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev Upgrade the backing implementation of the proxy.
     * Only the admin can call this function.
     * @param newImplementation Address of the new implementation.
     */
    function upgradeTo(address newImplementation) external payable ifAdmin AfterCharge {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the backing implementation of the proxy and call a function
     * on the new implementation.
     * This is useful to initialize the proxied contract.
     * @param newImplementation Address of the new implementation.
     * @param data Data to send as msg.data in the low level call.
     * It should include the signature and the parameters of the function to be called, as described in
     * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin AfterCharge {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success,) = newImplementation.delegatecall(data);
        require(success);
    }

    /**
     * @return adm The admin slot.
     */
    function _admin() internal view returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }

    /**
     * @dev Sets the address of the proxy admin.
     * @param newAdmin Address of the new proxy admin.
     */
    function _setAdmin(address newAdmin) internal {
        bytes32 slot = _ADMIN_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }

    /**
     * @dev Only fallback when the sender is not the admin.
     */
    function _willFallback() internal override virtual {
        // require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._willFallback();
    }
}

// File: contracts/YFIBCProxy.sol

pragma solidity >=0.6.0 <0.7.0;


/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract YFIBCProxy is ManagedProxy {
    constructor(
        address logic,
        address cashier,
        address admin
    )
        public
        payable
        ManagedProxy(
            logic,
            cashier,
            admin,
            abi.encodeWithSelector(0x9c020061, admin)
        )
    {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000699edac23a7c6b249354b3254b024b29a513c17000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004c015c525fae5bea1b955a302891560d87e38cca

-----Decoded View---------------
Arg [0] : logic (address): 0x699EDAC23a7C6B249354B3254b024b29A513c170
Arg [1] : cashier (address): 0x0000000000000000000000000000000000000000
Arg [2] : admin (address): 0x4C015C525FAe5beA1B955a302891560d87E38CcA

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000699edac23a7c6b249354b3254b024b29a513c170
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [2] : 0000000000000000000000004c015c525fae5bea1b955a302891560d87e38cca

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