Contract 0x04068da6c83afcfa0e13ba15a6696662335d5b75 5

Txn Hash Method
Block
From
To
Value [Txn Fee]
0xbf817a3b6b1f8baec33df6f18534ae4b76e42edcabd5e5d0c87002f6cfa3eeb7Approve199041222021-10-24 0:14:3311 secs ago0x8980b0f2434a4e4cfe5b8bf0e413bbced0f528ba IN  Centre: USD Coin0 FTM0.007576893623
0xe884f189e6c899e810fb964b81d3bd4fa8b4a373cdf7524791abf26815e80d8fApprove199041072021-10-24 0:14:2222 secs ago0x3569f6935813d9968588053992db8d208468d1f7 IN  Centre: USD Coin0 FTM0.00695658023
0x1c5fa51ee54879251fd26f6ec0df9d2d554e63ae44f0de6a956808ed0422cd28Approve199041022021-10-24 0:14:1826 secs ago0x896d7e3ed0a7bdaaa3075428e09ad89b6d102716 IN  Centre: USD Coin0 FTM0.007841162304
0x0efb7868259abc49d08c1eecec664d8c07121a1c5374d0a305ce39cb9420ead6Swapin199040832021-10-24 0:14:0341 secs ago0xc564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe IN  Centre: USD Coin0 FTM0.009987997699
0x5f48e7b9742fff1fa5d224d1b6370fe62bea413a5d3d1ac18078f0ddf6fbbce8Approve199040732021-10-24 0:13:5648 secs ago0xfce5cb8d24914c83dbb4f52ef8f8f463838454cf IN  Centre: USD Coin0 FTM0.007571475426
0xa3d6a23072057fdf259bef60d414deb5b509804081aa923b299e5902e52abe34Approve199040452021-10-24 0:13:301 min ago0xbcbd833dacdeeca51ae097203fea01a4394bfaa1 IN  Centre: USD Coin0 FTM0.007592191266
0xc1336b9205006d1e9c0c01e3ec470230bc015a8d6a9faa207c6c50d8e46052c7Approve199040342021-10-24 0:13:161 min ago0xbac002d8a4dbeb6b3a451581f2659175431b46b5 IN  Centre: USD Coin0 FTM0.007589576515
0xcc2aedb400762ac82877b425f250d8eee1484c5e2ac1a393c340db9ce3175cb6Approve199040242021-10-24 0:13:081 min ago0x156ea67e2b18b672e8e34a68dad4ff40cc4efbb5 IN  Centre: USD Coin0 FTM0.008574188788
0x694c5316c57846f6762fcda83cff1fa987c67509fd17a5016bb4c6d47d525d3dSwapin199040052021-10-24 0:12:511 min ago0xc564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe IN  Centre: USD Coin0 FTM0.010051147872
0xdb8dbcda458fe9660f5729bdbdf027552b8757c75bd132f94777220d8cb76193Approve199040022021-10-24 0:12:481 min ago0x508a9a520ed0902f7508f5aa853119c02a9e5058 IN  Centre: USD Coin0 FTM0.007616478802
0x3726dea8bedf5a2788d9725e4c386b67672ea884f4760353d80dee75d629d8fbApprove199039652021-10-24 0:12:172 mins ago0x8d588e463666fe8609d1edf2c64922af85a0f65b IN  Centre: USD Coin0 FTM0.007454361762
0x4f5bcbcc7dc501eed73b21fc260bf93c88209c446b6f9c9922ccb66ffb9b5519Approve199039452021-10-24 0:11:592 mins ago0x156ea67e2b18b672e8e34a68dad4ff40cc4efbb5 IN  Centre: USD Coin0 FTM0.007669879034
0x4ec796ea24d4b14dddba280dabb380fe7ed6b64b299c5ae479a4bb504e2f85bfApprove199038932021-10-24 0:11:173 mins ago0xd449362281ca90c3d952ac27d40e8f1911ee9388 IN  Centre: USD Coin0 FTM0.124673355032
0xd73327c17b34cb09570a41bfa5ee9fc814613882d17c534b6f4e179d8c799c92Approve199038922021-10-24 0:11:163 mins ago0x7019756d7b9f359d788b78fcee4423b856d1804f IN  Centre: USD Coin0 FTM0.01112075
0x60817a46f564587ef0c0a3e09e51bc1cafcd540a1ffa9f04d52a5bf02cbde514Swapin199038632021-10-24 0:10:493 mins ago0xc564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe IN  Centre: USD Coin0 FTM0.01020564256
0xdb4f1eee88b2f0bff5c4d674a86cc5fcfd2e45631aab5b961e35a248ada6cfbdApprove199038592021-10-24 0:10:434 mins ago0x0713837af35ca0243a1c1c66dda409116b01cdbf IN  Centre: USD Coin0 FTM0.007740733406
0x001c45418b6aa7bfbf4fb65f742736279dda615a0dff173cc0c4e797bf435c5bApprove199038362021-10-24 0:10:264 mins ago0xd0d211f28f0116161abe9334476dc3fa32115fe6 IN  Centre: USD Coin0 FTM0.01112075
0xa6053453e49b2b9c1507b4a3606aeb68b8d1f535dce60ef62082d6ce3646d22cApprove199038322021-10-24 0:10:234 mins ago0xdd30c4d82fc7e9f9ca1481f84c7f35c010393d32 IN  Centre: USD Coin0 FTM0.016712844
0x610239aa1d0396d98e8d8f09a20ac128713be0ea444c1f27085228214919bc5fTransfer199038242021-10-24 0:10:134 mins ago0x7912b3f5f358f5761377c041168332b63084a888 IN  Centre: USD Coin0 FTM0.009115049265
0x86efce6fb5018ff88787aed35b5476525215cea04a503b65add4431a389f3362Approve199037882021-10-24 0:09:395 mins ago0xef3c688d88a463f16f529e845c97c4b37e446691 IN  Centre: USD Coin0 FTM0.01112075
0xae170bfef85d3ad564f1fa8d2c13f8cceb11a579b18e825e8d494aa5f3a5f4f3Approve199037652021-10-24 0:09:175 mins ago0xfb97b7b6d0e3b7d4a60f54dab2a0855b1c0ee077 IN  Centre: USD Coin0 FTM0.00683341467
0xe481e088bec8e0a053f5e9220bcc2b27e629b0cd6de927e91508954257cd118eApprove199037522021-10-24 0:08:565 mins ago0x6d33d63eec9fd16f7cb94a0b886e7a461e04d8cf IN  Centre: USD Coin0 FTM0.006801458095
0x69e2b2c9139de074e0c5311453067acb3c39723f7c0cd5240503a2d2cc559fa4Approve199037472021-10-24 0:08:515 mins ago0x6399ad19d3831007363b36e98b2c55a0d1a869a1 IN  Centre: USD Coin0 FTM0.007356287159
0xcb39776936676aa75c90779351e8af8e90093a2feffc608b9a6efe72c9fbe789Approve199037442021-10-24 0:08:475 mins ago0xd08d71cb5a84ba5add4d4285007856a2ee780162 IN  Centre: USD Coin0 FTM0.00360213
0xc745ad61060af9827a1e4843eb5bc5bd4daea2098f0b24f096961fe1d839890eApprove199037312021-10-24 0:08:296 mins ago0xa2f8372aecaa3084a6b2463215c47f1658306607 IN  Centre: USD Coin0 FTM0.004011465501
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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 15 internal transactions
Parent Txn Hash Block From To Value
0xf0e04c6d0711f357133b08d4606eb40cd6093666869811514320a716421efa6e198501592021-10-23 11:33:2412 hrs 41 mins ago 0x46814c24e51b6b60ca8ba0fc9313f936e8f37195 Centre: USD Coin0.1 FTM
0xf1f4af0a65911c0c24a1e96b5d2fb43045374c92e3a9f684b99fad3a2bd6c939197870162021-10-22 20:07:481 day 4 hrs ago 0xa06c32770862dd2f212e53a41cbc6f85ccf5abac Centre: USD Coin1 FTM
0xf5ca76b741f142e542a938ffd6679369e2c64b986956932219a5e8b70b6cfd48193976662021-10-18 7:18:555 days 16 hrs ago 0x959c8be7123ea78d110364fc620870dad66ab485 Centre: USD Coin8.5624246396982 FTM
0xaca0ca796b08109751730cc1113926ac2a8259a4b965b0578bec004b86c61148192191622021-10-16 5:16:047 days 18 hrs ago 0x886fcb8cf385c4e3b52d238e17bd1266cd9c51d8 Centre: USD Coin0.2 FTM
0xfc22374f5def618b639cf5a0888a5d5c7cd4612510eb4bb5181baa134ba81f10186032452021-10-08 15:15:3215 days 8 hrs ago 0x9d3f3f7e0fb616e9f1e078bb7cb46df81bb75453 Centre: USD Coin0.5 FTM
0x08404aed9d76afe8aea1956dd39470e96a18e5c910964ee5288079dbba7f2674180896222021-10-01 20:37:3522 days 3 hrs ago 0xab139b9c4d20e24c632e94e64ca9ed3d31f6b449 Centre: USD Coin1 FTM
0x7c7bd14f91e4f3959a97130997d3ab7e6716752885d2457a89cdcb5027b59bb9175768842021-09-24 4:58:3329 days 19 hrs ago 0xd3e9f4a39912c90b38eea4c349ee48d5c4e6c5c5 Centre: USD Coin100 FTM
0x9ce8677ce276b5fda77c00f6974eb45320a0f81358f77f76581eec32a7caf266170129682021-09-13 20:03:3140 days 4 hrs ago 0x5881cdf4028c74e449889dcc9d33bce37653d603 Centre: USD Coin1.009859455572313 FTM
0x3c21fce8bd052bf6d7ed852712c6c7f425027662f89b42884f3b728968500b0a167863512021-09-10 1:24:4343 days 22 hrs ago 0x7628b141ced7bd780ca8d7bd02454c3e604cee62 Centre: USD Coin326.946531 FTM
0x1d151fa6f971790036f9c69ef7d4f243344ce9e0f4d9d13e1798eed644253f9a161265592021-09-02 5:25:1451 days 18 hrs ago 0x1db0fd6f7857bff5fad43c0ccd8883c1f5796cd5 Centre: USD Coin0.07 FTM
0x1a981d2b36a4253304847983d553f98c4a23b1ae7efb53e8fc210655318fc4de150154012021-08-19 23:21:2365 days 53 mins ago 0xbd20b13f96c1e7f233e1d9af0cd670ad075d59d3 Centre: USD Coin0.5 FTM
0x0e825474af79f2f91d672d174d98e8879fc7ba9d3c0ea35864dd63c7e3cfe08a133319162021-07-30 14:14:3285 days 10 hrs ago 0xeccbacefbdde4973a9589ee3b5a8149e525016a3 Centre: USD Coin500 FTM
0xbe8e2a39dd7126ec6115b7cfedddd805543556a1d95d6370aded77290a9c1d0b75331832021-05-24 20:28:06152 days 3 hrs ago 0x0a65c422ef68c6bcbcb4738c3181d191e157f6a1 Centre: USD Coin18.945365146944665889 FTM
0xfd8a5826fa596c1cf0417cf69ed9367e2bb0d70711f4914803902b8d0e30945472769092021-05-22 13:30:37154 days 10 hrs ago 0xfadb2329de7e044066175f48d4dce33bee09282d Centre: USD Coin10 FTM
0xca1c5242ac57d3bc87a3bae5fa17f7fd68c443a6be5d8e4532486e86b7d9c78122992702021-02-19 15:33:01246 days 8 hrs 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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