Contract 0x8D11eC38a3EB5E956B052f67Da8Bdc9bef8Abf3E 13

Txn Hash Method
Block
From
To
Value [Txn Fee]
0xa60e024afb3bd5e3916f9ed3ccd22a8248805b7bd21768bf2dbb2dcdf6f0e8e6Approve384877202022-05-18 4:28:201 min ago0x47e10825b99f7ac6c2529072dccd6b5f82cfc5f2 IN  Maker: Dai Stablecoin0 FTM0.0261327
0xe7e02ebf37f491ee92e472534edee686dbcab56a4241354ee8b028854093f28dApprove384874982022-05-18 4:24:046 mins ago0x949666ee5d1be779801e4a02e90f1a2d9cb1835b IN  Maker: Dai Stablecoin0 FTM0.026122237202
0xf72ce66a3cde32f047f19da1342a71835b43bd958fd49531fa9929bbc846400cApprove384872012022-05-18 4:18:3111 mins ago0x99ecd9ea69e14f2aae043815220acbb996270227 IN  Maker: Dai Stablecoin0 FTM0.029078568
0x877271aada7e8ec051041319e288c1f2bfd2e48a32f5d5f6772a32e7e17ee741Approve384866962022-05-18 4:07:3522 mins ago0x6d6674f15e670eb8ba385de0e8df17b3e8ec39c6 IN  Maker: Dai Stablecoin0 FTM0.026076492
0xcb116dcdf82f8b07cb0685d540d6b7b9f130f862a8ff682465927d824dc18106Approve384865202022-05-18 4:04:0026 mins ago0x02cfadc798a4eecafd482d271810319d4af067e9 IN  Maker: Dai Stablecoin0 FTM0.023424402
0xd781d5ca4e0ee041dbe1061eb6762ee6aa325d9dc5eff0eb92aa8c3329e49ee9Approve384865142022-05-18 4:03:5426 mins ago0x9e808276473438aae2d748b2b657cac01450c0bd IN  Maker: Dai Stablecoin0 FTM0.022394722834
0x77a9aeb9f8a586dacc55749e7b09bd17533cd3a9f19c0de164a34b8b7277c26aApprove384862632022-05-18 3:59:3630 mins ago0xb4e1f1fec4c44de51cf5ef4d20bba6335a32ef0d IN  Maker: Dai Stablecoin0 FTM0.024327168
0x1eaab931205ba4491d130583b1c64516f9c318484f02c2dddff46e33f5b5cf38Approve384861592022-05-18 3:57:5132 mins ago0x5eece526d4729d4c682274073564350b33d0a809 IN  Maker: Dai Stablecoin0 FTM0.024597166647
0xedae36757528f7728c98363af8606028d27ba56c9c1755feb63e1748c80a574eApprove384861572022-05-18 3:57:4932 mins ago0xc8b19839ae371bd541f20b15c3a3cb82bfb6a6c6 IN  Maker: Dai Stablecoin0 FTM0.023825605046
0x795a7589f218d1ace585b6b41b07268958d72493002ac87f671403c75a80f102Transfer384858792022-05-18 3:52:3837 mins ago0x96672db4b5f38687981e7d745682e6c67032c655 IN  Maker: Dai Stablecoin0 FTM0.011187680194
0x0a171d709ac652cb838f1f38665d310c6798ada3ad9afc59ef7564bf26a64e7fTransfer384857432022-05-18 3:49:5840 mins ago0x015d00b6957fe9700615d8d0bba8f2b46bc7e86c IN  Maker: Dai Stablecoin0 FTM0.011187680194
0x430c8835a9aab0416e9b661338a098ce011bb777be7a1de4280ae7a06008217dApprove384856042022-05-18 3:47:0943 mins ago0xcc98cfdc5f5480d8dd0a0d0a7f80506eb30d5159 IN  Maker: Dai Stablecoin0 FTM0.017167258127
0xdb4a672f5e204be068c313df8494587897162c0ec0475ec665f9fb11a6eda0f3Approve384854682022-05-18 3:44:3645 mins ago0x8c789c68cd1277846c6ffdbf3ea0ca460a0fe78b IN  Maker: Dai Stablecoin0 FTM0.044216448
0x80c3aae818e158e3dbcbea733e6da998c2d3b8622e0b7791b72107ce54d05c4aApprove384853212022-05-18 3:41:4748 mins ago0x8c789c68cd1277846c6ffdbf3ea0ca460a0fe78b IN  Maker: Dai Stablecoin0 FTM0.028275874795
0xb51e529ca84f17961f0f53f82088b55d99e13881c67063501efe608ffa674521Approve384849572022-05-18 3:35:0755 mins ago0xfc4d6e55a1b7c2f8568262dc0991edb63b338a9a IN  Maker: Dai Stablecoin0 FTM0.032876928
0x76768cf2d62a40f3a1b41a3052f27a4f82d4560317af33a4b79bc2d8f60b0373Approve384847582022-05-18 3:31:2558 mins ago0x2100f4c56309eca268ee3d20a10b2fb0688d04ab IN  Maker: Dai Stablecoin0 FTM0.033164772
0x6d6ffab5dae8305166a07d67cd3df2b83ae4adf8b5eaea3e9484c3df08d92285Approve384845552022-05-18 3:27:251 hr 2 mins ago0xef26a1e6e1e7aa6a2571a877d555f9cb0b1721ad IN  Maker: Dai Stablecoin0 FTM0.035587986
0x1f0d10800a0eed889e08cf76aa9d0d98ee2e5f72deb8734025e62984ea78978bTransfer384844522022-05-18 3:25:311 hr 4 mins ago0xdde51428d3970773838989e4c8a0b94117f4abfa IN  Maker: Dai Stablecoin0 FTM0.040601910642
0xb9b6ef99c79c58cdef73c7520c41740da06d67a814f43f3ff37a3156eb8aa854Approve384843862022-05-18 3:24:011 hr 6 mins ago0xc39605baa3e118b7bb6ae41195814e5541d35a94 IN  Maker: Dai Stablecoin0 FTM0.04109961
0xea26f8e8b328b32b1fe80f52f12900a95c14230e4056977db7975592fb1cccabTransfer384843442022-05-18 3:22:481 hr 7 mins ago0x8a6d33034539a4eb905a35e4d4b08de596323ab8 IN  Maker: Dai Stablecoin0 FTM0.042861393225
0x2aa8a9a5a4ccaa20b182ccceaa820f8955435e2d4ef98e0c7c95a70cdb9789f3Approve384843432022-05-18 3:22:461 hr 7 mins ago0xc310b96ddc81d4e115c473ade7e9092bca2212e5 IN  Maker: Dai Stablecoin0 FTM0.031922124213
0x402bdda487520a4a27b642e6b9670b554f536827335cc3f8e9fb7dc6b3702409Approve384841122022-05-18 3:16:231 hr 13 mins ago0x5eece526d4729d4c682274073564350b33d0a809 IN  Maker: Dai Stablecoin0 FTM0.031959428593
0x7404fb94e219edca1344dd67c5a8f6c7f85695d1b368b6f8fd95b0964663da63Approve384838852022-05-18 3:11:571 hr 18 mins ago0x99cd48b72aa11055e4a71a19891bde1ff96c6ff4 IN  Maker: Dai Stablecoin0 FTM0.018174174129
0xb2925a02d946c3a2489b66905a225cbc19bad3efbf35cbeb76af6809605119c7Approve384838382022-05-18 3:10:591 hr 19 mins ago0x99cd48b72aa11055e4a71a19891bde1ff96c6ff4 IN  Maker: Dai Stablecoin0 FTM0.033848848484
0x94c97363107a536818d27203c92d3cbc3b77dd1149d232b150e4965ede5385c9Approve384837902022-05-18 3:10:101 hr 20 mins ago0x61197639aa06207cf583f03d2c0e33e74da90fd8 IN  Maker: Dai Stablecoin0 FTM0.03421008
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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 1:50:2734 days 2 hrs ago 0xd2be3ced06a1daa6791dcfa08d2c218022a3aafb Maker: Dai Stablecoin491.6 FTM
0x946a7c7043bbebe9a27cdb1e50471dde302a384ae820838d6962b0eeeba388e4349810042022-04-01 18:20:1146 days 10 hrs ago 0xf423fad32cdbeae9c6e17cc4a0f4f4a2a87864dc Maker: Dai Stablecoin2 FTM
0x7ac0b743b461aa01cbe2d65881395f4e31b2121cbe8801279ded782e0ca5a7b1344564352022-03-26 15:17:1952 days 13 hrs ago 0x8295b24a6e3c05438d8e71bd5e78777ab23d83a9 Maker: Dai Stablecoin3 FTM
0xe7d94dd36916e4a6e17c58307521b0248abe99d83caba27d10cafd89cc290762337247642022-03-18 5:15:1660 days 23 hrs ago 0xedbdde1affcc6d3cb591d00577211c482b0c93eb Maker: Dai Stablecoin3 FTM
0x8874cefb091ddec1ef6d3e1c0ae168eab2b080d4eb9f952f086dab5d6c207a5f334527762022-03-15 2:42:4764 days 1 hr ago 0xb80a520619699f1dbf8f21502a57e173be73579c Maker: Dai Stablecoin25 FTM
0x08ccc6b0d50ee524f55b1eac5eb86775f9ac7fa32a2dabe02dc1add3c9f79559332524642022-03-12 19:08:3166 days 9 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Maker: Dai Stablecoin20.57121347 FTM
0xf359ecfc74b41d8165c0b294a50fc4d3248e35466073958fca07da367e2129ff320284092022-02-26 15:33:1780 days 12 hrs ago 0x73b6b667bd531ac7592f15d46f86765c4450aa20 Maker: Dai Stablecoin0.8 FTM
0xd351b225bfd7b17a5e2cd5a4f3326e75687568187ffba837c920af1412f84425311264632022-02-16 10:02:5490 days 18 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Maker: Dai Stablecoin16.53445734 FTM
0x640c6f01b48956c995b396035b2be2f106474686324bd0aa5830d03a92f39fdb310493302022-02-15 15:02:2891 days 13 hrs ago 0xbf2228c77f545bf533575af39f70922d37d8a680 Maker: Dai Stablecoin24.4232390692 FTM
0x3770a186a5106a5cf99a0e9276b519131260c570d2685d9efa82bbaa9d79cd17308800972022-02-13 21:15:5293 days 7 hrs ago 0xa743eeaca5dd3715277620a3389af46a9f60c68c Maker: Dai Stablecoin34.387783905440725035 FTM
0xb9aec227d95a3287ea4f563255a4c49c3e0b94979864cba031755651669e3a77297223282022-02-01 22:21:09105 days 6 hrs ago 0x9191979e42612503a8ed75df17aaf9ba2c252fa8 Maker: Dai Stablecoin0.01 FTM
0x3ead586ea68fe0d2093a8e5cf80d6354ed8088f4765c4d91ab9a49ec89143f4a297222112022-02-01 22:19:34105 days 6 hrs ago 0x9191979e42612503a8ed75df17aaf9ba2c252fa8 Maker: Dai Stablecoin0.01 FTM
0xe5b0fe4bf4a2623380b04937d8f589014f907713fb676645167a4e41973a3b54297192922022-02-01 21:38:34105 days 6 hrs ago 0x9191979e42612503a8ed75df17aaf9ba2c252fa8 Maker: Dai Stablecoin0.01 FTM
0x2854f663fc92e18297d4aeca4c987a23891ce015ee9d82427ed15afe54c69377293971452022-01-29 16:23:38108 days 12 hrs ago 0x913c1b4d865fff3e3d12de237580f7825e38aa09 Maker: Dai Stablecoin0.1 FTM
0x5b3869f9ff09901b3848de3157097bea253a33bdb3ca71741ba8705a3eb30835293970422022-01-29 16:22:22108 days 12 hrs ago 0x913c1b4d865fff3e3d12de237580f7825e38aa09 Maker: Dai Stablecoin0.1 FTM
0x3a9935a549b01f71923c268d875e78992acf7a7d99017f7b21504ee5ff4ac75d293970012022-01-29 16:21:51108 days 12 hrs ago 0x913c1b4d865fff3e3d12de237580f7825e38aa09 Maker: Dai Stablecoin1 FTM
0x9ba2a0d0fe79fe4c56070526002711ba62daffec85b7107402a7b0ea7ebdbe4b290154622022-01-25 15:14:25112 days 13 hrs ago 0x0e79065b5f11b5bd1e62b935a600976fff3754b9 Maker: Dai Stablecoin0.06 FTM
0xd38214bf07f8e30638bc675bd28023a05bfa8a1cf45185568fbd95ea717064cb283098282022-01-18 4:49:47119 days 23 hrs ago 0x9042c46b7559ba0521d670b5a41f60954e533bfd Maker: Dai Stablecoin10 FTM
0x67f65bc289ed64094df4c183e92bd95619404f0e14d885bfe6d4265d9d7f919b270453202022-01-05 7:48:24132 days 20 hrs ago 0xf6fdc2949247fe8dc1f476127e2b90c3602c33e8 Maker: Dai Stablecoin0.08 FTM
0xf2fede454f7bfb278274f5262e76c09f2792da631af0f8071aa481727f7407e7270452712022-01-05 7:47:47132 days 20 hrs ago 0xf6fdc2949247fe8dc1f476127e2b90c3602c33e8 Maker: Dai Stablecoin0.08 FTM
0x39edbfee8da34e706c18ab41d567675962551e40e4ab43cc70b7c9e670442711261972532021-12-27 13:54:10141 days 14 hrs ago 0x95cd1fe890d2e59b9493aac1bf21dd4ba558fa12 Maker: Dai Stablecoin130 FTM
0x8dcf6980f073cdef78479e7c47fb31fdaafd6e7fe6c1a0decf80632b238ab311261971902021-12-27 13:53:12141 days 14 hrs ago 0x95cd1fe890d2e59b9493aac1bf21dd4ba558fa12 Maker: Dai Stablecoin130 FTM
0x986912b0b4af10c11397e2c6bfc83325d645c3c4753522e13e55ec01a5cdc691261970492021-12-27 13:51:06141 days 14 hrs ago 0x95cd1fe890d2e59b9493aac1bf21dd4ba558fa12 Maker: Dai Stablecoin130 FTM
0xa201bdb0b44de3ed041c416a2a4be85a0352bbad02fa7d98ebad4de16b475831245986682021-12-10 23:55:56158 days 4 hrs ago 0x11f1df57f9c69c4e37ddd3e5d8eeb7253c0f081b Maker: Dai Stablecoin2 FTM
0x056e225de85881feb219a1d7348803e244f4f783515d149ed04ebb1a175df53b238042312021-12-02 19:47:11166 days 8 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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