Contract 0x8d11ec38a3eb5e956b052f67da8bdc9bef8abf3e 13

Txn Hash Method
Block
From
To
Value [Txn Fee]
0x3f4cad3021418a0f790a8e656ac52fa3d098cf1842c5218b626ee40979127d3dApprove384384782022-05-17 11:31:359 mins ago0x5d4614b4e5e21d7344b369e09b9be2bb8241a307 IN  Maker: Dai Stablecoin0 FTM0.011692361962
0x2e1a9377745228dea35c540a355aaf286a617e14eaa94cde42b2a86cadd73c92Approve384384512022-05-17 11:30:5110 mins ago0x02f86257c1b8d36dda702526426f24af653102ec IN  Maker: Dai Stablecoin0 FTM0.01028548064
0x54104b9b5ffab56c17269db21d4b985a0311e3747f76ca4f295da64230c69789Approve384383182022-05-17 11:28:1713 mins ago0x50e5641e3d589b9d64c1c6c775d4f71861fd48d3 IN  Maker: Dai Stablecoin0 FTM0.011115310776
0x0606c1e02f7fe24df502fa8b44f7d704dc78820ea386c35caeb5e2ad2cd7de40Approve384379102022-05-17 11:20:4220 mins ago0x60735e6ef350052f145fe47bf1cab75d5a33d559 IN  Maker: Dai Stablecoin0 FTM0.012879919991
0x35081db21f5008b795df9ccd11d0d01210e55fe657e83b33e06ab682587db796Approve384375702022-05-17 11:14:0827 mins ago0x8f03541eb8e42a6722e6343d552a753cef782003 IN  Maker: Dai Stablecoin0 FTM0.009847942546
0x5ff504de71d7fa026d767c4942499cd1b5b0a6b3deabba6964ff7dfa68e8affeApprove384374072022-05-17 11:11:2729 mins ago0xd387ba18826452cb23d79211bc644470029d40df IN  Maker: Dai Stablecoin0 FTM0.010995050127
0xc93462f247698a83e2ae2ffbbab08f95acdfaefc4773ce89d6a0f000160e379fApprove384373592022-05-17 11:10:3830 mins ago0x5a01bb4682d29c878d06aa2f1c20d2035eee9e39 IN  Maker: Dai Stablecoin0 FTM0.010139076853
0xb1a5c9458a78648f07e401769c573d703c4f8c5c5fb242773b1675c093ed18b3Approve384373502022-05-17 11:10:2830 mins ago0x60735e6ef350052f145fe47bf1cab75d5a33d559 IN  Maker: Dai Stablecoin0 FTM0.006186445643
0x83df667a0670bb3a0ef89b18ca5dae2a3fd8e5edb8610cc6a95d064054c8d0e9Transfer384372772022-05-17 11:09:1432 mins ago0x2a16b6d10c1127e6fd70771314ce87f1e8275935 IN  Maker: Dai Stablecoin0 FTM0.012032872148
0x6b404be9ab89fca4fbd5251a8d104510baab42c815a5a90f860322da0924bc3cTransfer384369142022-05-17 11:02:2738 mins ago0x4a5984d72650322bd090c6b4b71469bf19ab3689 IN  Maker: Dai Stablecoin0 FTM0.0370275
0xb99d9c186b80faf268dae52c097c2dd20ea8c89a18729c688abe3b6107887c38Approve384365512022-05-17 10:56:2345 mins ago0xce5279780024a996b8f2d5ffd27d15dac1d13317 IN  Maker: Dai Stablecoin0 FTM0.010481879626
0x9c5c6258e068350cc61d074c2a1e35ebacf6c440560a9835ae0dcdeaa625c58dTransfer384364902022-05-17 10:55:2246 mins ago0x9471f70f2518846f7a076636d64e5a22787da105 IN  Maker: Dai Stablecoin0 FTM0.01079736584
0xd913f5604c2ab4b5c70470a1f856dfa0524e90c73fcb08ad086c25b5e24d3f30Approve384357162022-05-17 10:41:2959 mins ago0xb9c8845689e278f1ba61ea99c297f98635d1f4db IN  Maker: Dai Stablecoin0 FTM0.012065794346
0x08f6aba2f64f7e980676945caf1a60f893fc36ab8f00a1dc595400c5a780b4d9Approve384356282022-05-17 10:39:491 hr 1 min ago0xdfb3bcd6169bc192d5e23d87b6f7a1171525b9d4 IN  Maker: Dai Stablecoin0 FTM0.012043973559
0x6eb88cf8b145b1059cc3174c1b7650cb530d45d9be98bdad3617864836d1e4e8Approve384352552022-05-17 10:33:101 hr 8 mins ago0xd96a1769fdcb59df2f5a18f91ddf6cccd7002516 IN  Maker: Dai Stablecoin0 FTM0.007361140428
0x8863026e12d373b13255cc8fef84ddd53c2403f9cb780437cb09edcc403ebeebApprove384350802022-05-17 10:29:511 hr 11 mins ago0xd594c4817688e9d38f40bb475834efffce3e780f IN  Maker: Dai Stablecoin0 FTM0.013010904158
0x9825075ec51a66b6cd7d0d6a1458d6508184010cc11949996aca2964bec78bd9Approve384346812022-05-17 10:22:351 hr 18 mins ago0x5aefabf2dce4396f0e546d1d99739ae380bc7c3f IN  Maker: Dai Stablecoin0 FTM0.006221987919
0x6bd0e4691951ff33ea7833bfd4d544dc8436d6c37dc427c267e8f20711f13fc6Approve384346332022-05-17 10:21:461 hr 19 mins ago0x5aefabf2dce4396f0e546d1d99739ae380bc7c3f IN  Maker: Dai Stablecoin0 FTM0.006220560954
0x367d6715bad0d270a30ad2118ce9b329e52bebfef35dfeaa97c9d218876cd6f6Approve384346192022-05-17 10:21:301 hr 19 mins ago0x5aefabf2dce4396f0e546d1d99739ae380bc7c3f IN  Maker: Dai Stablecoin0 FTM0.006218544405
0x6afd981a9600efc62122c4941894c57e88518bf6632069b98c2bf7c3894be5ffTransfer384342862022-05-17 10:15:321 hr 25 mins ago0x73459ef0a33ea718211e91504e9caebec0e6e667 IN  Maker: Dai Stablecoin0 FTM0.01387253812
0x3ba9c1b8ff079a154e03a399005503aee2dd1c55ca75828922257701cc673f74Approve384342562022-05-17 10:14:571 hr 26 mins ago0x3828d2ac9a1ca8a937991a7c397bce57373cffc2 IN  Maker: Dai Stablecoin0 FTM0.012634024616
0xa78c8cfcad882001572014e7db440b0dd66dd20e72046ef4f1ac54d436d97228Transfer384336852022-05-17 10:05:191 hr 36 mins ago0xb94fce94dda7d2ca197cf92393acf69361189c6c IN  Maker: Dai Stablecoin0 FTM0.008983234441
0xfd194e44905e36455f8914295857d8c5d12d27216143f8b9ff4490a58be74130Approve384326962022-05-17 9:47:081 hr 54 mins ago0x9bceef3892a57c403e2b73ab132db6d617656faf IN  Maker: Dai Stablecoin0 FTM0.015156966
0x43466b8a5a09dd8e94c34e34ea13c359e426b821997a7b986128c78623209ac9Approve384321952022-05-17 9:37:262 hrs 3 mins ago0x8dccce6c2359291f883e33f47c3980440ce90b0c IN  Maker: Dai Stablecoin0 FTM0.017722722
0x3783619d5a2e3eea88aae78f272edaf22067d8d85052d944681bb3597bbe181eApprove384319542022-05-17 9:33:002 hrs 8 mins ago0xaa057d736a46f3da6ac16b8da3178ee805bd8a65 IN  Maker: Dai Stablecoin0 FTM0.017770236
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OVERVIEW

Multi-Collateral Dai, brings a lot of new and exciting features, such as support for new CDP collateral types and Dai Savings Rate.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xfd7e3f71015dcc6673f6b655100fb8621ee6e959bfc8ad1b1f5b235359b8c384360000502022-04-14 1:50:2733 days 9 hrs ago 0xd2be3ced06a1daa6791dcfa08d2c218022a3aafb Maker: Dai Stablecoin491.6 FTM
0x946a7c7043bbebe9a27cdb1e50471dde302a384ae820838d6962b0eeeba388e4349810042022-04-01 18:20:1145 days 17 hrs ago 0xf423fad32cdbeae9c6e17cc4a0f4f4a2a87864dc Maker: Dai Stablecoin2 FTM
0x7ac0b743b461aa01cbe2d65881395f4e31b2121cbe8801279ded782e0ca5a7b1344564352022-03-26 15:17:1951 days 20 hrs ago 0x8295b24a6e3c05438d8e71bd5e78777ab23d83a9 Maker: Dai Stablecoin3 FTM
0xe7d94dd36916e4a6e17c58307521b0248abe99d83caba27d10cafd89cc290762337247642022-03-18 5:15:1660 days 6 hrs ago 0xedbdde1affcc6d3cb591d00577211c482b0c93eb Maker: Dai Stablecoin3 FTM
0x8874cefb091ddec1ef6d3e1c0ae168eab2b080d4eb9f952f086dab5d6c207a5f334527762022-03-15 2:42:4763 days 8 hrs ago 0xb80a520619699f1dbf8f21502a57e173be73579c Maker: Dai Stablecoin25 FTM
0x08ccc6b0d50ee524f55b1eac5eb86775f9ac7fa32a2dabe02dc1add3c9f79559332524642022-03-12 19:08:3165 days 16 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Maker: Dai Stablecoin20.57121347 FTM
0xf359ecfc74b41d8165c0b294a50fc4d3248e35466073958fca07da367e2129ff320284092022-02-26 15:33:1779 days 20 hrs ago 0x73b6b667bd531ac7592f15d46f86765c4450aa20 Maker: Dai Stablecoin0.8 FTM
0xd351b225bfd7b17a5e2cd5a4f3326e75687568187ffba837c920af1412f84425311264632022-02-16 10:02:5490 days 1 hr ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Maker: Dai Stablecoin16.53445734 FTM
0x640c6f01b48956c995b396035b2be2f106474686324bd0aa5830d03a92f39fdb310493302022-02-15 15:02:2890 days 20 hrs ago 0xbf2228c77f545bf533575af39f70922d37d8a680 Maker: Dai Stablecoin24.4232390692 FTM
0x3770a186a5106a5cf99a0e9276b519131260c570d2685d9efa82bbaa9d79cd17308800972022-02-13 21:15:5292 days 14 hrs ago 0xa743eeaca5dd3715277620a3389af46a9f60c68c Maker: Dai Stablecoin34.387783905440725035 FTM
0xb9aec227d95a3287ea4f563255a4c49c3e0b94979864cba031755651669e3a77297223282022-02-01 22:21:09104 days 13 hrs ago 0x9191979e42612503a8ed75df17aaf9ba2c252fa8 Maker: Dai Stablecoin0.01 FTM
0x3ead586ea68fe0d2093a8e5cf80d6354ed8088f4765c4d91ab9a49ec89143f4a297222112022-02-01 22:19:34104 days 13 hrs ago 0x9191979e42612503a8ed75df17aaf9ba2c252fa8 Maker: Dai Stablecoin0.01 FTM
0xe5b0fe4bf4a2623380b04937d8f589014f907713fb676645167a4e41973a3b54297192922022-02-01 21:38:34104 days 14 hrs ago 0x9191979e42612503a8ed75df17aaf9ba2c252fa8 Maker: Dai Stablecoin0.01 FTM
0x2854f663fc92e18297d4aeca4c987a23891ce015ee9d82427ed15afe54c69377293971452022-01-29 16:23:38107 days 19 hrs ago 0x913c1b4d865fff3e3d12de237580f7825e38aa09 Maker: Dai Stablecoin0.1 FTM
0x5b3869f9ff09901b3848de3157097bea253a33bdb3ca71741ba8705a3eb30835293970422022-01-29 16:22:22107 days 19 hrs ago 0x913c1b4d865fff3e3d12de237580f7825e38aa09 Maker: Dai Stablecoin0.1 FTM
0x3a9935a549b01f71923c268d875e78992acf7a7d99017f7b21504ee5ff4ac75d293970012022-01-29 16:21:51107 days 19 hrs ago 0x913c1b4d865fff3e3d12de237580f7825e38aa09 Maker: Dai Stablecoin1 FTM
0x9ba2a0d0fe79fe4c56070526002711ba62daffec85b7107402a7b0ea7ebdbe4b290154622022-01-25 15:14:25111 days 20 hrs ago 0x0e79065b5f11b5bd1e62b935a600976fff3754b9 Maker: Dai Stablecoin0.06 FTM
0xd38214bf07f8e30638bc675bd28023a05bfa8a1cf45185568fbd95ea717064cb283098282022-01-18 4:49:47119 days 6 hrs ago 0x9042c46b7559ba0521d670b5a41f60954e533bfd Maker: Dai Stablecoin10 FTM
0x67f65bc289ed64094df4c183e92bd95619404f0e14d885bfe6d4265d9d7f919b270453202022-01-05 7:48:24132 days 3 hrs ago 0xf6fdc2949247fe8dc1f476127e2b90c3602c33e8 Maker: Dai Stablecoin0.08 FTM
0xf2fede454f7bfb278274f5262e76c09f2792da631af0f8071aa481727f7407e7270452712022-01-05 7:47:47132 days 3 hrs ago 0xf6fdc2949247fe8dc1f476127e2b90c3602c33e8 Maker: Dai Stablecoin0.08 FTM
0x39edbfee8da34e706c18ab41d567675962551e40e4ab43cc70b7c9e670442711261972532021-12-27 13:54:10140 days 21 hrs ago 0x95cd1fe890d2e59b9493aac1bf21dd4ba558fa12 Maker: Dai Stablecoin130 FTM
0x8dcf6980f073cdef78479e7c47fb31fdaafd6e7fe6c1a0decf80632b238ab311261971902021-12-27 13:53:12140 days 21 hrs ago 0x95cd1fe890d2e59b9493aac1bf21dd4ba558fa12 Maker: Dai Stablecoin130 FTM
0x986912b0b4af10c11397e2c6bfc83325d645c3c4753522e13e55ec01a5cdc691261970492021-12-27 13:51:06140 days 21 hrs ago 0x95cd1fe890d2e59b9493aac1bf21dd4ba558fa12 Maker: Dai Stablecoin130 FTM
0xa201bdb0b44de3ed041c416a2a4be85a0352bbad02fa7d98ebad4de16b475831245986682021-12-10 23:55:56157 days 11 hrs ago 0x11f1df57f9c69c4e37ddd3e5d8eeb7253c0f081b Maker: Dai Stablecoin2 FTM
0x056e225de85881feb219a1d7348803e244f4f783515d149ed04ebb1a175df53b238042312021-12-02 19:47:11165 days 15 hrs ago 0x3c4c8c5b71386f2bb403ed6ce38c320583775f52 Maker: Dai Stablecoin22 FTM
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
Dai

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 Dai 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)

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

-----Decoded View---------------
Arg [0] : _name (string): Dai Stablecoin
Arg [1] : _symbol (string): DAI
Arg [2] : _decimals (uint8): 18
Arg [3] : _owner (address): 0xc564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [3] : 000000000000000000000000c564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [5] : 44616920537461626c65636f696e000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [7] : 4441490000000000000000000000000000000000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://3e7ea57271d96e0dbe4eb9e0f079b9815d830e72db5e978bd6dab9e3cd193b74
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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