Contract 0x8D11eC38a3EB5E956B052f67Da8Bdc9bef8Abf3E 4

Contract Overview

Maker: Dai Stablecoin
Balance:
0 FTM

FTM Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x625214643d7f243ba0c05c7e081271b7159f8057d2781dc3f3ad008a151f6903Approve196872402021-10-21 16:09:0428 secs ago0x1332cd9dbcc0d96b384e2fdfb381ac3ae2e602a1 IN  Maker: Dai Stablecoin0 FTM0.01064627208
0xbbc08f510617358951c64129d18d7ca0fa752fb832a095a164f05edeb112f031Approve196870152021-10-21 16:05:343 mins ago0x2d8ea9bcf57a8456085947ab4752f3f9104fc7db IN  Maker: Dai Stablecoin0 FTM0.013479088183
0x65683e7b6084a66a40345706f27ffe93bc2ef99c9fd9c29207ce6665d4a6f6deApprove196868002021-10-21 16:02:466 mins ago0x3ac710c45acaa126b5985826b9f5da87c1f30a33 IN  Maker: Dai Stablecoin0 FTM0.011781885607
0xea379182780c1238892aada1ce196c4798e122a021c8649ba1ced90a90258065Approve196867562021-10-21 16:02:057 mins ago0x977194eff89d3f6c862aa889aceec1ead6a3166f IN  Maker: Dai Stablecoin0 FTM0.011669438908
0xdee192473980bd20f3203431ce94e59011bf6aed551d855a34340be34fc49f37Approve196866492021-10-21 16:00:159 mins ago0x04c89b6513400df610c062f09bc243a743f34fd9 IN  Maker: Dai Stablecoin0 FTM0.012746790529
0xe9cc574070c984c6b6612a05c445765335aa0f32249a1172b0c0aeedff0e561aApprove196864072021-10-21 15:56:4012 mins ago0xf3cf9c810332281b0e51b4a04f6dd32378163c63 IN  Maker: Dai Stablecoin0 FTM0.011556167867
0x7bbfc234b4e26aba3ae6ccc5676704171af641bd0902cf1e254038c3a16806ffApprove196864052021-10-21 15:56:3812 mins ago0xda5369ef2e390648ff75734b70466f4f527d9441 IN  Maker: Dai Stablecoin0 FTM0.012520429836
0x28dc6fcda9e36d20ecde82c7713d4eb2e865808a6a57e26acdab42ee09df9ea0Approve196863362021-10-21 15:55:3713 mins ago0xa7ede8627841daa3a0e84c2bd262000208c8f4d4 IN  Maker: Dai Stablecoin0 FTM0.012563413759
0x79c44b67ba903c2fab86c9a232f7f9dbb6150cc7cfa1ca81609ab658fd7ff0bfApprove196862542021-10-21 15:54:2915 mins ago0x9c27427aded304f0176f749468e0c51a7a8571d6 IN  Maker: Dai Stablecoin0 FTM0.012707709774
0x7a38e99fb5b97c15b0a42fa9bb576d6fd7f7796d62e181d4dc803885b5842b6bApprove196861322021-10-21 15:52:3716 mins ago0xa07ecc8eb7c37b5a15a1e0abede26806c4bfcb85 IN  Maker: Dai Stablecoin0 FTM0.012199598882
0xd1c0f23a047e3e75a11ed097b36c9af10cbaa69088fd17c8a16fd30a3f212577Approve196860902021-10-21 15:52:0017 mins ago0xa61b6837beb1de1424ca0786f07dcc429b0c2130 IN  Maker: Dai Stablecoin0 FTM0.012206050682
0x945a396a46587a29fba00b561d1d9972285b8ac140261b2bdeb1d6a4b9e39b6cApprove196859962021-10-21 15:50:3618 mins ago0xa6fad4946732e3d22bb300bb4fc6897798c99ccb IN  Maker: Dai Stablecoin0 FTM0.008302994039
0x107caf9501eb032749ca19a0f86d43e4a5a377bf5eeaea457683ec46fcda7652Approve196858942021-10-21 15:49:0720 mins ago0x15ebd9fc8e8eb890c6dc8024835c1df3429aadb9 IN  Maker: Dai Stablecoin0 FTM0.014008783803
0x18cd14e0df124e067243991936a0731a013528a1bc2ebe9cf881ad149f9966a6Approve196858862021-10-21 15:49:0120 mins ago0xa6fad4946732e3d22bb300bb4fc6897798c99ccb IN  Maker: Dai Stablecoin0 FTM0.013404877975
0x17a7cee991c3ce04216019c183aae19d7e3af6381addc4337d84829ba4a4365eTransfer196858162021-10-21 15:47:5921 mins ago0x853681962a70213912c1e462c6600154acb27480 IN  Maker: Dai Stablecoin0 FTM0.011447273098
0x0e4b26a734572620bc8c4dc59ae47fecb9ed1a7e97634d4499105845c105ef35Approve196857502021-10-21 15:46:5722 mins ago0xa6779b9ec39ec6ed4c7220ef7291d62f4a8ef3d3 IN  Maker: Dai Stablecoin0 FTM0.014159210246
0x1fe48a7381ee90531f146708740faa24129c50dfe0db680e43f3cda84720ba47Transfer196856942021-10-21 15:46:0523 mins ago0x328e0a007896a4e92642bc7844e55845919085d9 IN  Maker: Dai Stablecoin0 FTM0.011351607496
0xf343bc5546b386207d2975bb1ddaa14df01d8193890114574a768530bbe74a46Approve196856282021-10-21 15:45:1224 mins ago0x622412e47e518e11538132a50bd599ac4586cb1a IN  Maker: Dai Stablecoin0 FTM0.013205429051
0xafc9ea70ad0e08e90f8a8cc75adfb1c48de0e613e0a1e1263b679c06efe86942Approve196856002021-10-21 15:44:5124 mins ago0xed5456c84812168584e45a83e8571a5a15485829 IN  Maker: Dai Stablecoin0 FTM0.013034168451
0xa6624b3805b3381363259a8524a6f5bbdd685881f3755b54cec9b7076c6b9579Approve196855002021-10-21 15:43:2626 mins ago0x4e2710c3fca81d89ad1f3418630a660c085f8533 IN  Maker: Dai Stablecoin0 FTM0.014369289942
0x70febf0ab5354702f3e840f2cc27a2e574c861655e1ee5c78e430a58518d3461Approve196854422021-10-21 15:42:3426 mins ago0x6633aa6c67aca4ad8316216d3436920c331fd98a IN  Maker: Dai Stablecoin0 FTM0.014161705742
0x3d756f7293b04a5dbb4d3c67eafb323be3965d8214606885839cd0372bcf9f81Approve196853792021-10-21 15:41:4427 mins ago0x652b4960411bf35f1e15ed7e31d1554ab441ff39 IN  Maker: Dai Stablecoin0 FTM0.014064674974
0x5aeb0b7ae10bb782bc8335286090863d8c0f34ead899320c9a350722965ef752Approve196853752021-10-21 15:41:4027 mins ago0xa3e9eefb18c6209837d266c7f23f566dcaa5ec5d IN  Maker: Dai Stablecoin0 FTM0.015583459639
0x84b271e1117f39b815696a6aed8569a6ee0076ad6d96e0bc42840da32f5efce2Approve196852902021-10-21 15:40:0929 mins ago0xa6779b9ec39ec6ed4c7220ef7291d62f4a8ef3d3 IN  Maker: Dai Stablecoin0 FTM0.012570406487
0x0f91f6d44f7b97c93e5690688b168eb23d77670564c0ebb81bf6c9ed2880205eApprove196852672021-10-21 15:39:4929 mins ago0xc632962758b679e5173645a655cfacdfb1d388ba IN  Maker: Dai Stablecoin0 FTM0.014134402077
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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 10 internal transactions
Parent Txn Hash Block From To Value
0x0e20a047030b2dcde52f30dd08ddbf2800fd3a44fc154951fc13a306f952b43b133987722021-07-31 10:22:3182 days 5 hrs ago 0x9ee9880d90f679e249dcf7bcaf01e377efd55520 Maker: Dai Stablecoin5 FTM
0x09efeee38d16749059f1c8a5222808a438b53ed72afa7b7c1654ebfdcb5aa7e163083042021-05-13 21:08:12160 days 19 hrs ago 0x279c14abc23e59f84c8efd640069231c3106e778 Maker: Dai Stablecoin0.01 FTM
0xb48d1c630c4117f3c3eb5d43ab03ab3a06367db9c1b07ed16b46f0dc33af706863082882021-05-13 21:08:00160 days 19 hrs ago 0x279c14abc23e59f84c8efd640069231c3106e778 Maker: Dai Stablecoin0.01 FTM
0x5ffecaee47488a00e19d7172f490fab2deae669b1df0b6ea6bb53acc97414ad563082312021-05-13 21:07:22160 days 19 hrs ago 0x279c14abc23e59f84c8efd640069231c3106e778 Maker: Dai Stablecoin0.01 FTM
0x90eccc244c5cd501e3222b086f08ecfdab437cde96de3e5bac1b0c79ec10215957342132021-05-09 1:02:45165 days 15 hrs ago 0x808c71453224beb9317b930b02a4dcb503e4e299 Maker: Dai Stablecoin0.2105 FTM
0x2fcf5ad313baadd96dffbccabb1d097dd1bd3a8c6766386d4556a93afd8daaa257185212021-05-08 22:01:06165 days 18 hrs ago 0x808c71453224beb9317b930b02a4dcb503e4e299 Maker: Dai Stablecoin0.1 FTM
0x7d9d898880321578cb37024f35f91813d29abbc6731196d5cd53b23f62fbe19957183292021-05-08 21:58:53165 days 18 hrs ago 0x808c71453224beb9317b930b02a4dcb503e4e299 Maker: Dai Stablecoin0.1 FTM
0xe63a9bd9dfa7829d89316fbf1f4b0534c774439be804a8cf069a13b89b01275357182722021-05-08 21:58:16165 days 18 hrs ago 0x808c71453224beb9317b930b02a4dcb503e4e299 Maker: Dai Stablecoin0.1 FTM
0x1d26588d3aa30a6b26dd590c36f2d77c5e687b3b07c11485d3f41f1cf975ef6657182342021-05-08 21:57:52165 days 18 hrs ago 0x808c71453224beb9317b930b02a4dcb503e4e299 Maker: Dai Stablecoin0.1 FTM
0x3f67e56ac26a8208cbaf1d3dcc67b0a43aa8ec2ea7c1c324316be67113c3f03522992452021-02-19 15:31:02244 days 38 mins ago Fantom: Deployer  Contract Creation0 FTM
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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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