Contract 0x04068DA6C83AFCFA0e13ba15A6696662335D5B75 5

Txn Hash Method
Block
From
To
Value [Txn Fee]
0xe5368d2055e08ce1ebc8eb96c80ca62aa00a6c51ed00811a27149d52a267e002Approve196868932021-10-21 16:03:5918 secs ago0xd8f3676a7567842295170b3f6ae4bd466a878374 IN  Centre: USD Coin0 FTM0.011880464431
0x83d5cb5a5ac6fc27e52786abb0a124a79c96cbc441d52b407131f3641c0e24ceApprove196868642021-10-21 16:03:3839 secs ago0x95c62c29dff9e6abc77ba5be55d572639f592526 IN  Centre: USD Coin0 FTM0.011931762079
0x875bbf5beeccc0e9a9d1a50f1f99e8511d45e9df25f89ab8194b7f9df18a50e4Approve196867972021-10-21 16:02:431 min ago0x06e71164219d52dad9cba10759402b5a3c391e38 IN  Centre: USD Coin0 FTM0.013286126491
0xf7814a1234e3d93e33e317e623f6ef3ffb29ea3d0e9bcbfe4cdbd808da96466eApprove196867862021-10-21 16:02:311 min ago0xa25bbda556d09e566f84276376389441b3c06f25 IN  Centre: USD Coin0 FTM0.011667223655
0x1548f3c5947831ed691cf57e52924950113177ff9d523623be56a1bbab6126ccApprove196867822021-10-21 16:02:271 min ago0x3c85f013cea5cb27cd81317df527f7085b18f337 IN  Centre: USD Coin0 FTM0.012240568879
0xc3d1b3a45ef088018b44a4e8e61bb43bd958af2dc37204db4d1c9274f1f1931dApprove196867742021-10-21 16:02:221 min ago0x977194eff89d3f6c862aa889aceec1ead6a3166f IN  Centre: USD Coin0 FTM0.011669438908
0x2fdaac47466bd87d37e6eeacc6e7529bd3da56b48ff451a816f8f3eae04249d4Transfer196867712021-10-21 16:02:191 min ago0x8f9a4e0cf89894b3b1967c8fa9e653630c6f3973 IN  Centre: USD Coin0 FTM0.013987832935
0x6a5433f23607ca4bb2942cab46ee692a76287b0b152da724657c8618d44defbcTransfer196867172021-10-21 16:01:302 mins ago0x8f9a4e0cf89894b3b1967c8fa9e653630c6f3973 IN  Centre: USD Coin0 FTM0.013987832935
0x5b9ec407b97630f0d1acbaff6f50f57c2ed818c93ddff9eba518204a3bea04e8Transfer196867162021-10-21 16:01:302 mins ago0x0f2728b22d769237dc3e342aa4e94562943cc0d0 IN  Centre: USD Coin0 FTM0.013340483195
0x4a94271acace44e157015e163c01364d3b145ac3c526f2e7fee2946cfa4d7cf8Approve196866922021-10-21 16:01:103 mins ago0x46919f4016befb3c9a01e72a1cfc395695276a01 IN  Centre: USD Coin0 FTM0.0179708
0xe859966a12b241388abd2ead565c19b53e72ca8ad586efc2ab0c1a52aace7edeApprove196866742021-10-21 16:00:503 mins ago0x9122a6026494242eb5563834fb9316cbc9720f60 IN  Centre: USD Coin0 FTM0.012090910885
0xa3ed732fb21de6ab3b0def53818f79ae94c12c61ec331c7be9e838c929350173Approve196866742021-10-21 16:00:503 mins ago0x69555c7ee1b5ab21b6694ddf328078f97015d47f IN  Centre: USD Coin0 FTM0.012640117103
0x02db44d423748b573d16c1981214b0315138618d5b86ead41cb0382b85a54bc6Approve196866702021-10-21 16:00:403 mins ago0x2d8ea9bcf57a8456085947ab4752f3f9104fc7db IN  Centre: USD Coin0 FTM0.014068333312
0xbd52d4a21fb9dccc5d41bc5bd4f77b5ad983e56ff17f40b530bf7d6cf3343971Approve196866652021-10-21 16:00:323 mins ago0xe61350768565a459c8d803b3f7a25616719958c8 IN  Centre: USD Coin0 FTM0.01250138702
0x85f1c61f56f8b2d0bb775b3cccf0161bae6e9284a46aeda5b9902c42c174d38cSwapout196866652021-10-21 16:00:323 mins ago0x03722d970d0ec292af019ba3a72733e1f7172e58 IN  Centre: USD Coin0 FTM0.01052323668
0x308742f9da72908d2f5028a83cff7a5ccf898e57381cc6a66d88796783180496Transfer196866362021-10-21 16:00:004 mins ago0x8f9a4e0cf89894b3b1967c8fa9e653630c6f3973 IN  Centre: USD Coin0 FTM0.0113496
0x37f9def8948c7f62c028eac666d922038f89389c11cbabb605f02fa94a1edd79Approve196866302021-10-21 15:59:544 mins ago0xb97c34053e0088d406b1f154e65fe27962c41f41 IN  Centre: USD Coin0 FTM0.011331946387
0x18af6db2b6828e420f26786cc55b005b5b0beb5d0da4d1b4f05185ad5c477609Approve196866192021-10-21 15:59:444 mins ago0x2d6eb53061983f8ed37d399309b62e30c6618d9a IN  Centre: USD Coin0 FTM0.013822438
0x9fc9928e29f911b701554db3daed410381f6981a711a97061333900c61b102feTransfer196865922021-10-21 15:59:115 mins ago0x0e4fa2388fd7d9185829b8bcde8e4039a4171a04 IN  Centre: USD Coin0 FTM0.0064695
0x83c213acc4825b23693d385d47e9c52866973e9a8c680486449afab29c7bb95eTransfer196865742021-10-21 15:58:595 mins ago0xa61b6837beb1de1424ca0786f07dcc429b0c2130 IN  Centre: USD Coin0 FTM0.00985180567
0x00d5f9535820a4578b8659bfc19384d8e81ba8ced4ef93f13d9fc41ed348fb53Transfer196865562021-10-21 15:58:465 mins ago0xaba218b589941637a36a0aff2dc042a730dc5ba3 IN  Centre: USD Coin0 FTM0.013586948486
0x23306fa3cf08e1ad5d82d6556e239f5a3455f11d5231cb2314c1de34ebcac119Approve196865472021-10-21 15:58:395 mins ago0x8d520d016246f31fe7a676648f1fd5e55ec5562d IN  Centre: USD Coin0 FTM0.011355660274
0xb4af33b0bbe48d36ca59c684ccd97a085a47af3ef64aac205da3d45752322507Approve196864922021-10-21 15:57:576 mins ago0x511da9db62025945fc697d4945455754ada813ca IN  Centre: USD Coin0 FTM0.011390383704
0xfbac1037d6dfc25ec6e41a948d052ca89a936a1b66f4dcd62b6c335d75e28b21Swapout196864672021-10-21 15:57:376 mins ago0x18fc0099cc649f53825f60fdda5f10f68965ed0f IN  Centre: USD Coin0 FTM0.018909
0xe9c3c0667d21c3571d79af52f6c23a8e4bfbef4aa44437f70281dae9980efc69Approve196864622021-10-21 15:57:326 mins ago0x0572826741f58b2ffabc6fe2b196ea77993442d8 IN  Centre: USD Coin0 FTM0.012981988195
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OVERVIEW

USDC is a fully collateralized US Dollar stablecoin developed by CENTRE, the open source project with Circle being the first of several forthcoming issuers.

Latest 13 internal transactions
Parent Txn Hash Block From To Value
0xf5ca76b741f142e542a938ffd6679369e2c64b986956932219a5e8b70b6cfd48193976662021-10-18 7:18:553 days 8 hrs ago 0x959c8be7123ea78d110364fc620870dad66ab485 Centre: USD Coin8.5624246396982 FTM
0xaca0ca796b08109751730cc1113926ac2a8259a4b965b0578bec004b86c61148192191622021-10-16 5:16:045 days 10 hrs ago 0x886fcb8cf385c4e3b52d238e17bd1266cd9c51d8 Centre: USD Coin0.2 FTM
0xfc22374f5def618b639cf5a0888a5d5c7cd4612510eb4bb5181baa134ba81f10186032452021-10-08 15:15:3213 days 48 mins ago 0x9d3f3f7e0fb616e9f1e078bb7cb46df81bb75453 Centre: USD Coin0.5 FTM
0x08404aed9d76afe8aea1956dd39470e96a18e5c910964ee5288079dbba7f2674180896222021-10-01 20:37:3519 days 19 hrs ago 0xab139b9c4d20e24c632e94e64ca9ed3d31f6b449 Centre: USD Coin1 FTM
0x7c7bd14f91e4f3959a97130997d3ab7e6716752885d2457a89cdcb5027b59bb9175768842021-09-24 4:58:3327 days 11 hrs ago 0xd3e9f4a39912c90b38eea4c349ee48d5c4e6c5c5 Centre: USD Coin100 FTM
0x9ce8677ce276b5fda77c00f6974eb45320a0f81358f77f76581eec32a7caf266170129682021-09-13 20:03:3137 days 20 hrs ago 0x5881cdf4028c74e449889dcc9d33bce37653d603 Centre: USD Coin1.009859455572313 FTM
0x3c21fce8bd052bf6d7ed852712c6c7f425027662f89b42884f3b728968500b0a167863512021-09-10 1:24:4341 days 14 hrs ago 0x7628b141ced7bd780ca8d7bd02454c3e604cee62 Centre: USD Coin326.946531 FTM
0x1d151fa6f971790036f9c69ef7d4f243344ce9e0f4d9d13e1798eed644253f9a161265592021-09-02 5:25:1449 days 10 hrs ago 0x1db0fd6f7857bff5fad43c0ccd8883c1f5796cd5 Centre: USD Coin0.07 FTM
0x1a981d2b36a4253304847983d553f98c4a23b1ae7efb53e8fc210655318fc4de150154012021-08-19 23:21:2362 days 16 hrs ago 0xbd20b13f96c1e7f233e1d9af0cd670ad075d59d3 Centre: USD Coin0.5 FTM
0x0e825474af79f2f91d672d174d98e8879fc7ba9d3c0ea35864dd63c7e3cfe08a133319162021-07-30 14:14:3283 days 1 hr ago 0xeccbacefbdde4973a9589ee3b5a8149e525016a3 Centre: USD Coin500 FTM
0xbe8e2a39dd7126ec6115b7cfedddd805543556a1d95d6370aded77290a9c1d0b75331832021-05-24 20:28:06149 days 19 hrs ago 0x0a65c422ef68c6bcbcb4738c3181d191e157f6a1 Centre: USD Coin18.945365146944665889 FTM
0xfd8a5826fa596c1cf0417cf69ed9367e2bb0d70711f4914803902b8d0e30945472769092021-05-22 13:30:37152 days 2 hrs ago 0xfadb2329de7e044066175f48d4dce33bee09282d Centre: USD Coin10 FTM
0xca1c5242ac57d3bc87a3bae5fa17f7fd68c443a6be5d8e4532486e86b7d9c78122992702021-02-19 15:33:01244 days 31 mins ago Fantom: Deployer  Contract Creation0 FTM
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Contract Source Code Verified (Exact Match)

Contract Name:
Usdc

Compiler Version
v0.8.1+commit.df193b15

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at FtmScan.com on 2021-02-19
*/

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.1;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev 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.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev 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.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev 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.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @dev Interface of the ERC2612 standard as defined in the EIP.
 *
 * Adds the {permit} method, which can be used to change one's
 * {IERC20-allowance} without having to send a transaction, by signing a
 * message. This allows users to spend tokens without having to hold Ether.
 *
 * See https://eips.ethereum.org/EIPS/eip-2612.
 */
interface IERC2612 {
    /**
     * @dev Sets `amount` as the allowance of `spender` over `owner`'s tokens,
     * given `owner`'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;

    /**
     * @dev Returns the current ERC2612 nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);
}

/// @dev Wrapped ERC-20 v10 (WERC10) is an ERC-20 ERC-20 wrapper. You can `deposit` ERC-20 and obtain an WERC10 balance which can then be operated as an ERC-20 token. You can
/// `withdraw` ERC-20 from WERC10, which will then burn WERC10 token in your wallet. The amount of WERC10 token in any wallet is always identical to the
/// balance of ERC-20 deposited minus the ERC-20 withdrawn with that specific wallet.
interface IWERC10 is IERC20, IERC2612 {

    /// @dev Sets `value` as allowance of `spender` account over caller account's WERC10 token,
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// Emits {Approval} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// For more information on approveAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);

    /// @dev Moves `value` WERC10 token from caller's account to account (`to`), 
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// A transfer to `address(0)` triggers an ERC-20 withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - caller account must have at least `value` WERC10 token.
    /// For more information on transferAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function transferAndCall(address to, uint value, bytes calldata data) external returns (bool);
}

interface ITransferReceiver {
    function onTokenTransfer(address, uint, bytes calldata) external returns (bool);
}

interface IApprovalReceiver {
    function onTokenApproval(address, uint, bytes calldata) external returns (bool);
}

library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

library SafeERC20 {
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

/// @dev Wrapped Ether v10 (WERC10) is an Ether (ETH) ERC-20 wrapper. You can `deposit` ETH and obtain an WERC10 balance which can then be operated as an ERC-20 token. You can
/// `withdraw` ETH from WERC10, which will then burn WERC10 token in your wallet. The amount of WERC10 token in any wallet is always identical to the
/// balance of ETH deposited minus the ETH withdrawn with that specific wallet.
contract Usdc is IWERC10 {
    using SafeERC20 for IERC20;
    string public name;
    string public symbol;
    uint8  public immutable decimals;

    bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant TRANSFER_TYPEHASH = keccak256("Transfer(address owner,address to,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public immutable DOMAIN_SEPARATOR;

    /// @dev Records amount of WERC10 token owned by account.
    mapping (address => uint256) public override balanceOf;
    uint256 private _totalSupply;
    
    address private _oldOwner;
    address private _newOwner;
    uint256 private _newOwnerEffectiveTime;
    
    
    modifier onlyOwner() {
        require(msg.sender == owner(), "only owner");
        _;
    }
    
    function owner() public view returns (address) {
        if (block.timestamp >= _newOwnerEffectiveTime) {
            return _newOwner;
        }
        return _oldOwner;
    }
    
    
    function changeDCRMOwner(address newOwner) public onlyOwner returns (bool) {
        require(newOwner != address(0), "new owner is the zero address");
        _oldOwner = owner();
        _newOwner = newOwner;
        _newOwnerEffectiveTime = block.timestamp + 2*24*3600;
        emit LogChangeDCRMOwner(_oldOwner, _newOwner, _newOwnerEffectiveTime);
        return true;
    }

    function Swapin(bytes32 txhash, address account, uint256 amount) public onlyOwner returns (bool) {
        _mint(account, amount);
        emit LogSwapin(txhash, account, amount);
        return true;
    }

    function Swapout(uint256 amount, address bindaddr) public returns (bool) {
        require(bindaddr != address(0), "bind address is the zero address");
        _burn(msg.sender, amount);
        emit LogSwapout(msg.sender, bindaddr, amount);
        return true;
    }

    /// @dev Records current ERC2612 nonce for account. This value must be included whenever signature is generated for {permit}.
    /// Every successful call to {permit} increases account's nonce by one. This prevents signature from being used multiple times.
    mapping (address => uint256) public override nonces;

    /// @dev Records number of WERC10 token that account (second) will be allowed to spend on behalf of another account (first) through {transferFrom}.
    mapping (address => mapping (address => uint256)) public override allowance;
    
    event LogChangeDCRMOwner(address indexed oldOwner, address indexed newOwner, uint indexed effectiveTime);
    event LogSwapin(bytes32 indexed txhash, address indexed account, uint amount);
    event LogSwapout(address indexed account, address indexed bindaddr, uint amount);
    
    constructor(string memory _name, string memory _symbol, uint8 _decimals, address _owner) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        
        _newOwner = _owner;
        _newOwnerEffectiveTime = block.timestamp;
        
        uint256 chainId;
        assembly {chainId := chainid()}
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)));
    }
    
    /// @dev Returns the total supply of WERC10 token as the ETH held in this contract.
    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }
    
    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        balanceOf[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        balanceOf[account] -= amount;
        _totalSupply -= amount;
        emit Transfer(account, address(0), amount);
    }
    
    /// @dev Sets `value` as allowance of `spender` account over caller account's WERC10 token.
    /// Emits {Approval} event.
    /// Returns boolean value indicating whether operation succeeded.
    function approve(address spender, uint256 value) external override returns (bool) {
        // _approve(msg.sender, spender, value);
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);

        return true;
    }

    /// @dev Sets `value` as allowance of `spender` account over caller account's WERC10 token,
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// Emits {Approval} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// For more information on approveAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function approveAndCall(address spender, uint256 value, bytes calldata data) external override returns (bool) {
        // _approve(msg.sender, spender, value);
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        
        return IApprovalReceiver(spender).onTokenApproval(msg.sender, value, data);
    }

    /// @dev Sets `value` as allowance of `spender` account over `owner` account's WERC10 token, given `owner` account's signed approval.
    /// Emits {Approval} event.
    /// Requirements:
    ///   - `deadline` must be timestamp in future.
    ///   - `v`, `r` and `s` must be valid `secp256k1` signature from `owner` account over EIP712-formatted function arguments.
    ///   - the signature must use `owner` account's current nonce (see {nonces}).
    ///   - the signer cannot be zero address and must be `owner` account.
    /// For more information on signature format, see https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP section].
    /// WERC10 token implementation adapted from https://github.com/albertocuestacanada/ERC20Permit/blob/master/contracts/ERC20Permit.sol.
    function permit(address target, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external override {
        require(block.timestamp <= deadline, "WERC10: Expired permit");

        bytes32 hashStruct = keccak256(
            abi.encode(
                PERMIT_TYPEHASH,
                target,
                spender,
                value,
                nonces[target]++,
                deadline));

        require(verifyEIP712(target, hashStruct, v, r, s) || verifyPersonalSign(target, hashStruct, v, r, s));

        // _approve(owner, spender, value);
        allowance[target][spender] = value;
        emit Approval(target, spender, value);
    }

    function transferWithPermit(address target, address to, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external returns (bool) {
        require(block.timestamp <= deadline, "WERC10: Expired permit");

        bytes32 hashStruct = keccak256(
            abi.encode(
                TRANSFER_TYPEHASH,
                target,
                to,
                value,
                nonces[target]++,
                deadline));

        require(verifyEIP712(target, hashStruct, v, r, s) || verifyPersonalSign(target, hashStruct, v, r, s));

        require(to != address(0) || to != address(this));
        
        uint256 balance = balanceOf[target];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[target] = balance - value;
        balanceOf[to] += value;
        emit Transfer(target, to, value);
        
        return true;
    }
    
    function verifyEIP712(address target, bytes32 hashStruct, uint8 v, bytes32 r, bytes32 s) internal view returns (bool) {
        bytes32 hash = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                hashStruct));
        address signer = ecrecover(hash, v, r, s);
        return (signer != address(0) && signer == target);
    }
    
    function verifyPersonalSign(address target, bytes32 hashStruct, uint8 v, bytes32 r, bytes32 s) internal pure returns (bool) {
        bytes32 hash = prefixed(hashStruct);
        address signer = ecrecover(hash, v, r, s);
        return (signer != address(0) && signer == target);
    }
    
    // Builds a prefixed hash to mimic the behavior of eth_sign.
    function prefixed(bytes32 hash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /// @dev Moves `value` WERC10 token from caller's account to account (`to`).
    /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - caller account must have at least `value` WERC10 token.
    function transfer(address to, uint256 value) external override returns (bool) {
        require(to != address(0) || to != address(this));
        uint256 balance = balanceOf[msg.sender];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[msg.sender] = balance - value;
        balanceOf[to] += value;
        emit Transfer(msg.sender, to, value);
        
        return true;
    }

    /// @dev Moves `value` WERC10 token from account (`from`) to account (`to`) using allowance mechanism.
    /// `value` is then deducted from caller account's allowance, unless set to `type(uint256).max`.
    /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`),
    /// unless allowance is set to `type(uint256).max`
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - `from` account must have at least `value` balance of WERC10 token.
    ///   - `from` account must have approved caller to spend at least `value` of WERC10 token, unless `from` and caller are the same account.
    function transferFrom(address from, address to, uint256 value) external override returns (bool) {
        require(to != address(0) || to != address(this));
        if (from != msg.sender) {
            // _decreaseAllowance(from, msg.sender, value);
            uint256 allowed = allowance[from][msg.sender];
            if (allowed != type(uint256).max) {
                require(allowed >= value, "WERC10: request exceeds allowance");
                uint256 reduced = allowed - value;
                allowance[from][msg.sender] = reduced;
                emit Approval(from, msg.sender, reduced);
            }
        }
        
        uint256 balance = balanceOf[from];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[from] = balance - value;
        balanceOf[to] += value;
        emit Transfer(from, to, value);
        
        return true;
    }

    /// @dev Moves `value` WERC10 token from caller's account to account (`to`), 
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - caller account must have at least `value` WERC10 token.
    /// For more information on transferAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function transferAndCall(address to, uint value, bytes calldata data) external override returns (bool) {
        require(to != address(0) || to != address(this));
        
        uint256 balance = balanceOf[msg.sender];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[msg.sender] = balance - value;
        balanceOf[to] += value;
        emit Transfer(msg.sender, to, value);

        return ITransferReceiver(to).onTokenTransfer(msg.sender, value, data);
    }
}

Contract Security Audit

Contract ABI

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Type":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"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":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"transferAndCall","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":"target","type":"address"},{"internalType":"address","name":"to","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":"transferWithPermit","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000006000000000000000000000000c564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe000000000000000000000000000000000000000000000000000000000000000855534420436f696e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045553444300000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _name (string): USD Coin
Arg [1] : _symbol (string): USDC
Arg [2] : _decimals (uint8): 6
Arg [3] : _owner (address): 0xc564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [3] : 000000000000000000000000c564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [5] : 55534420436f696e000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 5553444300000000000000000000000000000000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://5052df72629d76d63845a29628826582047991598fc392546a7f8b34941e0a16
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Validator ID :
0 FTM

Amount Staked
0

Amount Delegated
0

Staking Total
0

Staking Start Epoch
0

Staking Start Time
0

Proof of Importance
0

Origination Score
0

Validation Score
0

Active
0

Online
0

Downtime
0 s
Address Amount claimed Rewards Created On Epoch Created On
Block Uncle Number Difficulty Gas Used Reward
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