Contract 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb 23

 
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0x5c932fbde08baf2639eb6549c5501c13c75132a4f7a64789c546023f76d89754Approve135119982024-04-22 19:15:4355 secs ago0xf4882eb91d7efccb5111f3e6d43c68967ca14341 IN  Maker: DAI Token0 ETH0.0000045266220.097124035
0xfa5975c63e55c21712d6bf465fd9bf843d48e4ca4c200ea2f9335052b2f3e1abApprove135119782024-04-22 19:15:031 min ago0x6c2da459d8b71bb018a547696325fcfdcf6fbe2f IN  Maker: DAI Token0 ETH0.0000053207580.114504268
0x24d779d503ead2e00d7783a7c86ce37bd27ed93a700fe55ab0a465d8f4658fa3Approve135119772024-04-22 19:15:011 min ago0x874705f9118444f8c50edefd1ca9d763855f9461 IN  Maker: DAI Token0 ETH0.0000046229680.09919429
0x32e4dcfcb5fee001669560837ce40ca177f24afe34820f12f3347c0e64959e5cApprove135119772024-04-22 19:15:011 min ago0xb9e9eecd1f697b1519bbd9677393cefad8348459 IN  Maker: DAI Token0 ETH0.0000046467780.09974552
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0xff83523f2a1b5ae96dd89dc49e627e3de3d2db6beea3959e4c4d5aed26b20816Approve135119432024-04-22 19:13:532 mins ago0xdcd2faa0c6039e82b2939c9584ca7a3c8b6e34b2 IN  Maker: DAI Token0 ETH0.000004760850.102253537
0xe5e8f3df5d9b5a2014e3815b5f90bbe856091b23bc117bc10772a6f7e1c7fed4Approve135119412024-04-22 19:13:492 mins ago0x7a4ffe9ed5e54b094993904ccc3cae339aa08b4c IN  Maker: DAI Token0 ETH0.0000052151210.111267827
0x84960b9e5e6f37a8c469d8fe8cbc57aa5884954da59bbbffa40ccf07b9412560Approve135119312024-04-22 19:13:293 mins ago0x1f8398d155b852e599368f5ca215f673808288f0 IN  Maker: DAI Token0 ETH0.0000052409850.111727371
0x055b266fd0d62134e67764f6c1dc8af5eb42f404befa7e6111e1a4e6ec94e117Approve135119282024-04-22 19:13:233 mins ago0x0d845c23994a08aa20c3d76ce4418bb2dba9bbbe IN  Maker: DAI Token0 ETH0.000004753730.102106672
0xb89a978fe9d3de10d70dd7b9830b3d7deb942b2555c74a17bf4ce62e9bf969b3Approve135119112024-04-22 19:12:493 mins ago0x077575247e2564f696a395afb58bb4522d1b694a IN  Maker: DAI Token0 ETH0.0000049030660.104460337
0xbfdad7943aa9d5e75057a78c747c35f18d0f1bfd8f723aa2b4e08dc6ac37300aApprove135119082024-04-22 19:12:433 mins ago0x6ef4e9549e5c70359599064c1e82535d593fc40b IN  Maker: DAI Token0 ETH0.0000048892940.104317861
0x9f31f4e2ab6d63d28daf068469dbac96a55fc8f053c3c05f5fe3b102387b1b57Approve135118922024-04-22 19:12:114 mins ago0xa485aec5d93a019e371a8c68766eac44235884de IN  Maker: DAI Token0 ETH0.0000073820730.158716809
0xaaf4ce3187bb3878a7f78a30118e6b289b58d7f92439e47a40ce0f095a5033b8Approve135118622024-04-22 19:11:115 mins ago0xd2ca5ad2a9b459f272b25148a3666a55d408fda0 IN  Maker: DAI Token0 ETH0.0000051139670.109653019
0x4b078950fa5f2a5ddb9020806e08b365b5148e02f1c635795dc7022300af1ad4Approve135118542024-04-22 19:10:555 mins ago0x38cd698cf736397df08055c02db6176a71bbe811 IN  Maker: DAI Token0 ETH0.0000052053690.110843133
0xa6f9c974230835df4ec22116ef291a3385b8fc8529d010dfe221d12e8ec30b8eApprove135118532024-04-22 19:10:535 mins ago0xdebe149b0395e22d8c45ab4662d0508f59767d97 IN  Maker: DAI Token0 ETH0.0000056830620.121108238
0x2d4799a2833556fbadc98b244364ac9629eb902b8fc37d29e7934b990a11ace5Transfer135117982024-04-22 19:09:037 mins ago0xe017966296618d8be01b5239b96a866d80781351 IN  Maker: DAI Token0 ETH0.0000059653790.126732666
0x550e7d1e0194ea2a8e914365ad6f3b1a173b1aabb02af1f2d42169e3e0bd878fApprove135117962024-04-22 19:08:597 mins ago0xd50d577a5de3e8ee4c9c1529fef94f46ab272b24 IN  Maker: DAI Token0 ETH0.000006175370.1325
0x47ccc9401a9bcc552198ea86a56ebb47b1f77b69f5874626dae709976f96ba65Approve135117772024-04-22 19:08:218 mins ago0x40fdd28c496468b794539591d63f683b76940b7d IN  Maker: DAI Token0 ETH0.0000060755430.129646233
0xce6ae82c351fb4681eb9098ed33b3c3b5c5d865587efd3f977b7065db4708176Approve135117542024-04-22 19:07:359 mins ago0x7c4fcb940951f28bad7cc5aed232fb31e4367511 IN  Maker: DAI Token0 ETH0.0000064614270.1389
0x7594efd9593fc8296588d5c5ed7aca41489926bc17a64523002c6413ff8b2758Approve135117522024-04-22 19:07:319 mins ago0x008350d57ac12561745af41cc7560210aa4d669a IN  Maker: DAI Token0 ETH0.0000064919550.13984332
0x6e51994e2c56666770cf798b1f1744f9e03657dba6b66249902b1bcf38890066Approve135117442024-04-22 19:07:159 mins ago0xe392612d49fdc5bf74d5f02f633e132662ba56b8 IN  Maker: DAI Token0 ETH0.0000030014090.122291714
0xc7850e7c65866337e04d44d22fd8676ef61d797ad34d5c42b5221093351a474fApprove135117292024-04-22 19:06:459 mins ago0xb6e23af18505b00ef66af51b08a3be27761f925b IN  Maker: DAI Token0 ETH0.0000058172360.124080314
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0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xa37bca6d7e927302c801694a80877192ffd77ef6b00a2c2086b155b406c79b3a19018082023-07-29 1:09:23268 days 18 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0x9649f1b51a0c77053ea7a7eaa145d4cccdafebc15d8a4e6fb7eb05b65958ac1318678552023-07-28 6:17:37269 days 12 hrs ago 0xba12222222228d8ba445958a75a0704d566bf2c8 Maker: DAI Token0 ETH
0xb2eb7e1beb91ff30fabc62344027804fba3b8a91e6a8bb714e0635d6a1869a9418678342023-07-28 6:16:55269 days 12 hrs ago 0xba12222222228d8ba445958a75a0704d566bf2c8 Maker: DAI Token0 ETH
0xcca83de3bdf54a10d2188da0dbafc72b9c6239ab85c899b92d7d5e27e99e81cd18678282023-07-28 6:16:43269 days 12 hrs ago 0xcde67b70e8144d7d2772de59845b3a67266c2ca7 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xd2c2e9c79c9d914bec13b7ca4666b4f4a7fb67d3e218622155d1f2d2fd59267918672442023-07-28 5:57:15269 days 13 hrs ago 0x4200000000000000000000000000000000000010 Maker: DAI Token0 ETH
0xf43cce95211b807d9e50ecfe46754490bd53173321bf2a123b569939a5c07d6715695982023-07-21 8:35:43276 days 10 hrs ago 0x4200000000000000000000000000000000000012  Contract Creation0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
OptimismMintableERC20

Compiler Version
v0.8.15+commit.e14f2714

Optimization Enabled:
Yes with 999999 runs

Other Settings:
london EvmVersion
File 1 of 9 : OptimismMintableERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;

import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import { ILegacyMintableERC20, IOptimismMintableERC20 } from "./IOptimismMintableERC20.sol";
import { Semver } from "../universal/Semver.sol";

/**
 * @title OptimismMintableERC20
 * @notice OptimismMintableERC20 is a standard extension of the base ERC20 token contract designed
 *         to allow the StandardBridge contracts to mint and burn tokens. This makes it possible to
 *         use an OptimismMintablERC20 as the L2 representation of an L1 token, or vice-versa.
 *         Designed to be backwards compatible with the older StandardL2ERC20 token which was only
 *         meant for use on L2.
 */
contract OptimismMintableERC20 is IOptimismMintableERC20, ILegacyMintableERC20, ERC20, Semver {
    /**
     * @notice Address of the corresponding version of this token on the remote chain.
     */
    address public immutable REMOTE_TOKEN;

    /**
     * @notice Address of the StandardBridge on this network.
     */
    address public immutable BRIDGE;

    /**
     * @notice Emitted whenever tokens are minted for an account.
     *
     * @param account Address of the account tokens are being minted for.
     * @param amount  Amount of tokens minted.
     */
    event Mint(address indexed account, uint256 amount);

    /**
     * @notice Emitted whenever tokens are burned from an account.
     *
     * @param account Address of the account tokens are being burned from.
     * @param amount  Amount of tokens burned.
     */
    event Burn(address indexed account, uint256 amount);

    /**
     * @notice A modifier that only allows the bridge to call
     */
    modifier onlyBridge() {
        require(msg.sender == BRIDGE, "OptimismMintableERC20: only bridge can mint and burn");
        _;
    }

    /**
     * @custom:semver 1.0.0
     *
     * @param _bridge      Address of the L2 standard bridge.
     * @param _remoteToken Address of the corresponding L1 token.
     * @param _name        ERC20 name.
     * @param _symbol      ERC20 symbol.
     */
    constructor(
        address _bridge,
        address _remoteToken,
        string memory _name,
        string memory _symbol
    ) ERC20(_name, _symbol) Semver(1, 0, 0) {
        REMOTE_TOKEN = _remoteToken;
        BRIDGE = _bridge;
    }

    /**
     * @notice Allows the StandardBridge on this network to mint tokens.
     *
     * @param _to     Address to mint tokens to.
     * @param _amount Amount of tokens to mint.
     */
    function mint(address _to, uint256 _amount)
        external
        virtual
        override(IOptimismMintableERC20, ILegacyMintableERC20)
        onlyBridge
    {
        _mint(_to, _amount);
        emit Mint(_to, _amount);
    }

    /**
     * @notice Allows the StandardBridge on this network to burn tokens.
     *
     * @param _from   Address to burn tokens from.
     * @param _amount Amount of tokens to burn.
     */
    function burn(address _from, uint256 _amount)
        external
        virtual
        override(IOptimismMintableERC20, ILegacyMintableERC20)
        onlyBridge
    {
        _burn(_from, _amount);
        emit Burn(_from, _amount);
    }

    /**
     * @notice ERC165 interface check function.
     *
     * @param _interfaceId Interface ID to check.
     *
     * @return Whether or not the interface is supported by this contract.
     */
    function supportsInterface(bytes4 _interfaceId) external pure returns (bool) {
        bytes4 iface1 = type(IERC165).interfaceId;
        // Interface corresponding to the legacy L2StandardERC20.
        bytes4 iface2 = type(ILegacyMintableERC20).interfaceId;
        // Interface corresponding to the updated OptimismMintableERC20 (this contract).
        bytes4 iface3 = type(IOptimismMintableERC20).interfaceId;
        return _interfaceId == iface1 || _interfaceId == iface2 || _interfaceId == iface3;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for the remote token. Use REMOTE_TOKEN going forward.
     */
    function l1Token() public view returns (address) {
        return REMOTE_TOKEN;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for the bridge. Use BRIDGE going forward.
     */
    function l2Bridge() public view returns (address) {
        return BRIDGE;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for REMOTE_TOKEN.
     */
    function remoteToken() public view returns (address) {
        return REMOTE_TOKEN;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for BRIDGE.
     */
    function bridge() public view returns (address) {
        return BRIDGE;
    }
}

File 2 of 9 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @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:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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 virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 3 of 9 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 4 of 9 : IOptimismMintableERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @title IOptimismMintableERC20
 * @notice This interface is available on the OptimismMintableERC20 contract. We declare it as a
 *         separate interface so that it can be used in custom implementations of
 *         OptimismMintableERC20.
 */
interface IOptimismMintableERC20 is IERC165 {
    function remoteToken() external returns (address);

    function bridge() external returns (address);

    function mint(address _to, uint256 _amount) external;

    function burn(address _from, uint256 _amount) external;
}

/**
 * @custom:legacy
 * @title ILegacyMintableERC20
 * @notice This interface was available on the legacy L2StandardERC20 contract. It remains available
 *         on the OptimismMintableERC20 contract for backwards compatibility.
 */
interface ILegacyMintableERC20 is IERC165 {
    function l1Token() external returns (address);

    function mint(address _to, uint256 _amount) external;

    function burn(address _from, uint256 _amount) external;
}

File 5 of 9 : Semver.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";

/**
 * @title Semver
 * @notice Semver is a simple contract for managing contract versions.
 */
contract Semver {
    /**
     * @notice Contract version number (major).
     */
    uint256 private immutable MAJOR_VERSION;

    /**
     * @notice Contract version number (minor).
     */
    uint256 private immutable MINOR_VERSION;

    /**
     * @notice Contract version number (patch).
     */
    uint256 private immutable PATCH_VERSION;

    /**
     * @param _major Version number (major).
     * @param _minor Version number (minor).
     * @param _patch Version number (patch).
     */
    constructor(
        uint256 _major,
        uint256 _minor,
        uint256 _patch
    ) {
        MAJOR_VERSION = _major;
        MINOR_VERSION = _minor;
        PATCH_VERSION = _patch;
    }

    /**
     * @notice Returns the full semver contract version.
     *
     * @return Semver contract version as a string.
     */
    function version() public view returns (string memory) {
        return
            string(
                abi.encodePacked(
                    Strings.toString(MAJOR_VERSION),
                    ".",
                    Strings.toString(MINOR_VERSION),
                    ".",
                    Strings.toString(PATCH_VERSION)
                )
            );
    }
}

File 6 of 9 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}

File 7 of 9 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 8 of 9 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 9 of 9 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

Settings
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    "@openzeppelin/contracts-upgradeable/=node_modules/@openzeppelin/contracts-upgradeable/",
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    "@rari-capital/=node_modules/@rari-capital/",
    "@rari-capital/solmate/=node_modules/@rari-capital/solmate/",
    "ds-test/=node_modules/ds-test/src/",
    "forge-std/=node_modules/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
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      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

Contract Security Audit

Contract ABI

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":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000042000000000000000000000000000000000000100000000000000000000000006b175474e89094c44da98b954eedeac495271d0f000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000000e44616920537461626c65636f696e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034441490000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _bridge (address): 0x4200000000000000000000000000000000000010
Arg [1] : _remoteToken (address): 0x6B175474E89094C44Da98b954EedeAC495271d0F
Arg [2] : _name (string): Dai Stablecoin
Arg [3] : _symbol (string): DAI

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000004200000000000000000000000000000000000010
Arg [1] : 0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [5] : 44616920537461626c65636f696e000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [7] : 4441490000000000000000000000000000000000000000000000000000000000


Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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