Contract 0x04068da6c83afcfa0e13ba15a6696662335d5b75 14

Contract Overview

Centre: USD Coin
Balance:
0 FTM

FTM Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x8083eed57f334c7786fb43c3f938d172bddd92b89c80a9c1045a6326841470e3Approve385937342022-05-19 15:34:509 secs ago0x2b6c44a44e106ca97dec41b017d31afde4f20ff7 IN  Centre: USD Coin0 FTM0.0145677
0x74946e049e23ce474b27ba5c12546e05a88b94dd5f2c51385d19c76b62c1531cTransfer385935472022-05-19 15:31:253 mins ago0x8864dd7d0b2d5b9ff40b46a46bac57ee6f48da26 IN  Centre: USD Coin0 FTM0.008022654126
0x2babadc2ec341085709d663ce8f06213002e4ef27020e1f7192cdd2d415d913eApprove385935162022-05-19 15:30:354 mins ago0x96783cfd992c23e26d3ac77673b2c2d9438a2501 IN  Centre: USD Coin0 FTM0.012338358353
0xab41d89658f80217a543f418e4b4073113249ca66435e44482cd0306649f3c0fApprove385935032022-05-19 15:30:174 mins ago0x153cfacd2c76b35ee54d8761984a9e3012410418 IN  Centre: USD Coin0 FTM0.010110132397
0x19098e351045d06e41718f4f4af87306b15cc9fccffc12d43bc654c71d68614eApprove385934562022-05-19 15:29:145 mins ago0x260d7938cdb9953978eae24862cce3ea5ea6197a IN  Centre: USD Coin0 FTM0.010745913294
0x9007ab531cf5a4431d343b90686e1aa7cab863ee17981ed902485c7c013b27d2Approve385934362022-05-19 15:28:536 mins ago0xb6b001e210c4a87950e58bfebd9800c874892248 IN  Centre: USD Coin0 FTM0.010752442768
0x86ae7fb8b5a74ae68209d132ef9f9fc81c33e4c7b98e0258696aacdb73b70cbeSwapout385934312022-05-19 15:28:456 mins ago0x93f1d0f5d872274c43fd64119af62dbf680f4b99 IN  Centre: USD Coin0 FTM0.007166968798
0xe78d0c8ac3e06a8d818864a59eb45d6de08c4360801b0b98089b8927e3f8b2a4Approve385933122022-05-19 15:26:288 mins ago0x874fcedfbd923bfe104ad50180cefc34faf475d9 IN  Centre: USD Coin0 FTM0.011158316
0x771b773fe1e5bc69e83b2d851998eb04aefb2fb9e24864b5fb67e80a19d14309Swapin385933112022-05-19 15:26:258 mins ago0xc564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe IN  Centre: USD Coin0 FTM0.015945023856
0xf648ae891a56ca2609f0237eaf286d8687854339687facde6ca29e421a5fb653Transfer385933002022-05-19 15:26:108 mins ago0x511b37cc01f704b5d7b8a473b5075e22d407f092 IN  Centre: USD Coin0 FTM0.012107600669
0xf2eed4bac841427c7d5db3ff5873624e3d07417e7eed94493b4e95744a80a373Approve385932562022-05-19 15:25:109 mins ago0x67b8503e1e126da36536f1e58b36a8b7709f8f5c IN  Centre: USD Coin0 FTM0.010748352592
0xb03194571a73c957480fd652987629df21dae5b2790cede49947b5d6f6a8afbeApprove385932302022-05-19 15:24:1610 mins ago0x576a8c595349147562b3b8dc32460b15e37ed9ed IN  Centre: USD Coin0 FTM0.009519933157
0x1c506f3e514d1d33f422b79ac523df77bdd46fc83a9d9b1482e750a775d9ccd4Approve385932212022-05-19 15:24:0010 mins ago0x4b63eda92ceaf9f5bf5e562343a4dc2f058d20d8 IN  Centre: USD Coin0 FTM0.005156564009
0x714551efbcb3568f99c3771e87425dc7de9a6ca40366cfcc5b74eb024414f308Approve385931802022-05-19 15:23:1311 mins ago0x9831923b10a68d3d751380798b2f0e012e8140ab IN  Centre: USD Coin0 FTM0.00756891
0x7635ec1aad2d86858bc7e1888499b0ea2a27725b939f4efbd6b44ff996784709Approve385931722022-05-19 15:22:5612 mins ago0x9831923b10a68d3d751380798b2f0e012e8140ab IN  Centre: USD Coin0 FTM0.00695331
0x49fc93fd4bc58a77819bf604e30c14aa640017a439eb2badaf33ac16167ba28fApprove385931272022-05-19 15:22:0512 mins ago0x9831923b10a68d3d751380798b2f0e012e8140ab IN  Centre: USD Coin0 FTM0.01393992
0x1a9f865ff3c25e4dd5db1a3539c1d7692400acbf208b6cf89ccb71eb05d8d01dApprove385931192022-05-19 15:21:5813 mins ago0x44e32e18bcddeca5a4f284edf5bd4ced6d62bc9c IN  Centre: USD Coin0 FTM0.0051506
0x26c89a2d281242adc1d30cfc265cd5e53e9ef1a6c4d74015dc70715b4cb952c9Approve385931192022-05-19 15:21:5813 mins ago0xcf9df692cd650f4e3bbc8ab94bb3e2138543bb8c IN  Centre: USD Coin0 FTM0.009488496121
0x5e004c2f29b2d986776a30df975ca6c1c9ba45528a05d50ffda2d3b3411ef7b2Approve385931152022-05-19 15:21:5513 mins ago0x13d512a5ee610ed5f204ceccda279df4e095cb4b IN  Centre: USD Coin0 FTM0.00965826382
0xf96950423a4ac7cc7a274f67701148dae3f3fea6abdb7195c4cde028190c930fApprove385930442022-05-19 15:20:4414 mins ago0x9bd857d633b0bae3be79694cf2483c7c10542365 IN  Centre: USD Coin0 FTM0.009699389814
0x2959877b75f3cba7d758fac0430bc322bfc78e583fa79e7455763b2a5c4bc4b3Approve385929862022-05-19 15:19:2315 mins ago0x44e32e18bcddeca5a4f284edf5bd4ced6d62bc9c IN  Centre: USD Coin0 FTM0.0093166
0x83b48f56d153b635ec692c21a63410a8762b3511d5a3e4b0b19e9d019c0cb04aTransfer385929852022-05-19 15:19:2015 mins ago0xd6dac5db7e70bb8b2031a61e741f121402b464ce IN  Centre: USD Coin0 FTM0.014139957951
0x92adbbb5c06e27559af0e9a3cc94ef9bf197a59bee291b1921b3eb294aed9f37Approve385929472022-05-19 15:18:2116 mins ago0x62d4fc13ba94b8c543d17a863fa61d34c8c230f7 IN  Centre: USD Coin0 FTM0.009979848911
0xe127f39594dde071840663f49216a218e25ad440161257e1decbcb40eec1c76aTransfer385928862022-05-19 15:17:1317 mins ago0x468b4d24d6305f42a6f3fd40d7333ce9a0bffd29 IN  Centre: USD Coin0 FTM0.011080625476
0x7fd2f91936229276a77600c36fe000ff60988108795b8fb0338910af67b11fdcApprove385928862022-05-19 15:17:1317 mins ago0x25f0858a6b820fba7c69beb79660250c010337db IN  Centre: USD Coin0 FTM0.010663922215
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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 25 internal transaction
Parent Txn Hash Block From To Value
0xe05cb43d9b7535270d747bfefd1f159c650f774009477251df797c98b7c8e633358948452022-04-12 17:45:3236 days 21 hrs ago 0x45b10aabc7a16b6c1b908c3421f31c159e74d80c Centre: USD Coin0.1 FTM
0x3b3ecb800cdc5684be40944e522e0d006d98fe9e4205effe90290116a1ce5759353807342022-04-06 13:04:5543 days 2 hrs ago 0x53b24bc4a57c302304e28cd4d86a72cb0ca465d5 Centre: USD Coin20 FTM
0x179fdc0fe5cc9e516573086ec0971feffd4c0912c0acb151b6e8903d9a628d6d350923322022-04-03 2:22:3446 days 13 hrs ago 0xa53fcbe483f02a799a70aa48a9dddde4c1814a0c Centre: USD Coin60.87247866 FTM
0xd4c66577b0d7c4a40b6ddfb72a9f28ad9c1706b140cb9dc69755f85ddb2c7115350076442022-04-02 2:14:1647 days 13 hrs ago 0x376804a307499359fe1949cfe642c55e96273af2 Centre: USD Coin9.048642225839156642 FTM
0x9a997f9d828dee73156433937d9f01502178ca25f5ce13301645ec13baa8e4f1344392932022-03-26 10:16:0154 days 5 hrs ago 0x1712c5e00bd4b93082cc595337b7fe7c4bd339cf Centre: USD Coin5.891158156698105121 FTM
0x5f8bf324b90244375f6f15e54d390bb725311f2130a9450a38db29e7d50d4175340081122022-03-21 9:52:3359 days 5 hrs ago 0x0988815ab01e4903690e3e62a64a5dae139cc20a Centre: USD Coin0.2 FTM
0x9df4a92a06a13ddfa91ec3bc5d3830382550a7daf05ea2dbc43523f0d4063137335096112022-03-15 18:23:0264 days 21 hrs ago 0x353b58e05e6a4d40485dd8b0da103dcfec975cc3 Centre: USD Coin2 FTM
0x4b8a997446099779aaa1615ac77498f6331ed3cd0360014bce062de23fa90a64335095702022-03-15 18:22:0864 days 21 hrs ago 0x353b58e05e6a4d40485dd8b0da103dcfec975cc3 Centre: USD Coin2 FTM
0xab337203a2fda44999d481e92757cb86cacf59508dd10001cd53154c35d9ea37335095062022-03-15 18:20:4764 days 21 hrs ago 0x353b58e05e6a4d40485dd8b0da103dcfec975cc3 Centre: USD Coin2 FTM
0x8ab05a02be46d89abb102c44731fba5a706359c25d9b4938543584ca7ad54d55331342122022-03-11 11:39:3169 days 3 hrs ago 0x5e0a51cd455dbb26fc25e6303cbc0867845e51ba Centre: USD Coin2.9737623756482 FTM
0x84efd3239616d334350b97c3cbbe31ef92edd94f6ca251dbebf5e46126bbb9d6329097092022-03-08 22:20:3071 days 17 hrs ago 0xd4ecc931268c286134e7127b3ebb105fec9ca2c5 Centre: USD Coin2 FTM
0xc0d28071092baaa9a6a6db0d95b3ecc08f8c53663e60ba68e19891891648f984327373402022-03-06 21:16:0073 days 18 hrs ago 0x4deb56a42fc63650b2f0bfb9abe1850e3a091371 Centre: USD Coin6 FTM
0xd5e52c93b98ae46860ddf794f34849e7ef4a22f3ef0867e9bd45cdca811f8786323793932022-03-02 18:42:0977 days 20 hrs ago 0x21bd1d5644d8f44efe986a804c66f87542c6f5ff Centre: USD Coin2.912336 FTM
0x60b0c3d2f7a1ce43a8d478c566d3603cb02789824178ef3d7e60bcbecf2a1516320313012022-02-26 16:25:4181 days 23 hrs ago 0x8a67ba51407e92da1fae93950efd5d43617500d0 Centre: USD Coin2.02116890897414 FTM
0xcc5741144bbf71a82860117611e8b26674a560b0aebf445e24e621fb08bb4de5319508882022-02-25 17:54:4682 days 21 hrs ago 0x8efff40c351cd93274c9bb0d29eda63dafa7c826 Centre: USD Coin106 FTM
0xaeda3e01b7128a81e23837c9b2ce5a716eaafe52b17c85b45ea9f9b45b21a281319508352022-02-25 17:54:0082 days 21 hrs ago 0x8efff40c351cd93274c9bb0d29eda63dafa7c826 Centre: USD Coin108.6055057216 FTM
0x8b2926f785ff25d999ba5d84e126b7bde89bfcb5879b7a18c5bdaa1894ad5e97318636682022-02-24 12:12:0084 days 3 hrs ago 0xaee6b9f0af12f98b6f524f177f5b2094e87d510b Centre: USD Coin1 FTM
0x613cc90ea7dcb0fb5a366b106ee4eb0420c13f87b7bae77d78bf5a44304da33e318013942022-02-23 16:09:2184 days 23 hrs ago 0xf34c3613fe740d698405e0ba6994f78a0214bc91 Centre: USD Coin0.7461398807715 FTM
0x6fcb2ef2704d0aca688101387ff9f12e656d2d2e015eeae04637e41659ed1e61318013772022-02-23 16:08:5684 days 23 hrs ago 0xf34c3613fe740d698405e0ba6994f78a0214bc91 Centre: USD Coin0.7751667863715 FTM
0x6c6e5a302d1f18a84a464cc508cbccab4f69367aeb7811673e9faa54e3c5d777316433332022-02-21 21:27:2286 days 18 hrs ago 0x15acdde30b45b7bdbbb430f59faaf6ac3ab1972a Centre: USD Coin1 FTM
0x5a780a7227536a1b69ae8cd501a035ee1f6cff2acb1ed32a729ab0d8565ff2dd316421132022-02-21 21:10:2086 days 18 hrs ago 0x82235938a27efc6963dbca2a6a2441199339e92d Centre: USD Coin301.57692527 FTM
0xce6afbe3ede7b00a4d753f9aa959f15fb913bca4a3cd96eef4adac52ba67e36b304833452022-02-09 20:23:1098 days 19 hrs ago 0x0d983174251f703edb61a7b3a51538ea95a1e399 Centre: USD Coin0.000000000001 FTM
0xac34f7737ae94b9430bd30ae08420c0a46bdc76d33cd3c2160b885a60feeaee8303920832022-02-08 21:10:0999 days 18 hrs ago 0x4792e9ad872e8267c4f3686cd3465fb57a41f21a Centre: USD Coin0.5 FTM
0xfa0b1ae392f36a5a497611d86130872342f7657c8e5bc41b35e6c8e0428c903e302467232022-02-07 7:13:28101 days 8 hrs ago 0x82235938a27efc6963dbca2a6a2441199339e92d Centre: USD Coin108.36531608 FTM
0xb318e858852ecac50fdeff6c44c4b044d54bcc132c8272c0bf7406459d974e9d300654802022-02-05 10:16:27103 days 5 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Centre: USD Coin139.99 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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