Contract 0x117cFd9060525452db4A34d51c0b3b7599087f05 1

 
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0x2b056703f4a909da93194cfc76d73db9c7fc28848ba67d05c811371806299df0Approve226879792022-09-11 4:02:5219 days 17 hrs ago0xd131f1bcdd547e067af447dd3c36c99d6be9fdeb IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.000023493720.001
0x84fd23496b3dd0dd53f30692a10355e4aa724c902a28575223755d8def285798Approve220201752022-09-05 16:29:1525 days 5 hrs ago0x18c6a47aca1c6a237e53ed2fc3a8fb392c97169b IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000807344330.0012
0x1bc5fd68cfc49c3e903278effc5334cf3e30cdecdcfe976a76be9860a04ddfa0Approve218058222022-09-03 11:57:0727 days 9 hrs ago0x7d6064bfdcb13fd2021a34285fce0afd74b8c3c2 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000271856480.001
0x58856938db45f3a4c5c37b0f8c2a2e0e0a764ce1f154b78a85f110f3e7ca7836Approve218002932022-09-03 10:46:0127 days 10 hrs ago0x7d6064bfdcb13fd2021a34285fce0afd74b8c3c2 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000246936880.001
0xde7fefdba23d860b2b9cfc4f2bbc4cbaf21ce2374680e23f5a0a32b3e9a3b303Approve216617362022-09-02 10:41:0228 days 11 hrs ago0x66d1f600b54b9c2576ba45cfd2090ac8e941db2e IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000400796690.001
0xa87b5e8163f7c46454575c2f2a33492b25d5539fc11ef34ee7c8113f8d518e20Approve205179732022-08-25 10:46:1036 days 10 hrs ago0xa423887ff566144452d338dbc4e018daebb28886 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000209726480.001
0xe42a43c3eff686d350ee83ad1e684ad88436a711c629a0a1f32fa3e20356ff27Approve205178292022-08-25 10:44:4036 days 11 hrs ago0xa423887ff566144452d338dbc4e018daebb28886 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000183697770.001
0x626dc26490f6bb0ca96e9b215e120725287778e7a7a43fcc80735b9a419d34feApprove205129652022-08-25 9:30:2136 days 12 hrs ago0x80fdc30d21a672eef723b809ed4ba7c91728d421 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000517657630.001
0x528ce09e214a505b3c4ebf16ab55bffc7d83c2238528c3b92628186d2fa4bf88Approve201148432022-08-22 4:34:5139 days 17 hrs ago0xac569e0f62c7cbbb987518692aae056a0ae1dd18 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000202957310.001
0x63146b71f57530b5d906a4b6d26662f6d7d16b32f20337d9baff08979e839b08Approve201147592022-08-22 4:32:2739 days 17 hrs ago0xac569e0f62c7cbbb987518692aae056a0ae1dd18 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000158432930.001
0x8a0781e2b93b5a22e267be402e2ec9c1bb93ac762a7894b8e381052bbc54e227Approve201145632022-08-22 4:27:3539 days 17 hrs ago0xac569e0f62c7cbbb987518692aae056a0ae1dd18 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000200925090.001
0x90c4a4e465386210e92883ae67e199bfd36db8acc4a838c1e85d6c5237fc7711Approve196888252022-08-19 1:17:1242 days 20 hrs ago0x8594d8e9483473626908648a5539d9d65ca2fe8d IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001326698051
0xd8ddc0b23f68206d6c5089c2ab780fe4449bad295e7504b7f201d027c430984cApprove189619122022-08-13 10:51:4148 days 10 hrs ago0xa31aeea459c1ab0124ed44711a678d6e18874692 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000416551440.001
0x273e4003d84d5b9ed0bf05ab262b32cc18f3c62b0655a616beee075dc134e14dApprove189617002022-08-13 10:48:4348 days 10 hrs ago0xa31aeea459c1ab0124ed44711a678d6e18874692 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000357985840.001
0x2a8d8a783dbb9d70ccfc2c27fe641fb21488e446f8fb5886fc1e8b7219bf8d09Approve182022782022-08-07 16:16:0554 days 5 hrs ago0xa4573c69aec75d90a3aa4f963453148b96153099 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001725864520.001
0x703a3ed4ec5c4f30dbf8f79ec37907fafcbe0de70c6ab4a40ad1f12d40f6d256Approve180753632022-08-06 16:06:1255 days 5 hrs ago0xa4573c69aec75d90a3aa4f963453148b96153099 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000569109060.001
0x033274807fedf8c39ea0cb329b082ed7222a72d168329837829796f74f662cc2Approve179317572022-08-05 17:23:0756 days 4 hrs ago0x9c0900df1ecd97d5ca973eea2377c05579e10130 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001560097090.001
0x2a5e77f346f7c5688f865b1f6a060e3ab56559dc543d40e92c7330f5e969fc9cApprove178448062022-08-05 9:50:5156 days 11 hrs ago0xebbcb26872d9c2e879f84bf8c89ab1106bf0f453 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000238142850.001
0xca3512d3de98adf2e8d29636b7e0d4edd0b519b471038819d4a9b96b146e137aApprove174016042022-08-03 7:57:2758 days 13 hrs ago0x06f3fffe777d69c0575bf51357d2e965f6385d9b IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000250276350.001
0x971a13946c632784d97e24d54bca5b91a881950d28ca03344eff09bd4be5a831Approve171867332022-08-02 3:51:2459 days 17 hrs ago0x0ea05c8b55de589f984839d7657da24507720a25 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0000377587310.0012
0x027bd7fedc2daf9e75006d0c4e417d89994cf3c28af75c42adc63eaf140ff994Approve157488502022-07-25 17:41:4767 days 4 hrs ago0x0ea05c8b55de589f984839d7657da24507720a25 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001115425970.00115
0x752a5c155fa53f4b9cf297ab6ff37867f6b29df5d12cb3f2154e7a5c4be1dc6cApprove147737942022-07-17 17:40:1775 days 4 hrs ago0x8bb9e4652a58c744db8da84bfa24761d1a6f5a36 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001184776510.001
0xe5aecb77bbf81477d6eefa6fef9e2d97e811d079d60a4f4d806df76308e7f821Approve147737442022-07-17 17:40:0175 days 4 hrs ago0x8bb9e4652a58c744db8da84bfa24761d1a6f5a36 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001184776510.001
0xc897b7ef3867ee305fcf89bd1c50714d9b4066df8374d09a8ed732bb52d3cd98Approve147737412022-07-17 17:40:0175 days 4 hrs ago0x8bb9e4652a58c744db8da84bfa24761d1a6f5a36 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001184975510.001
0xc1dfe0d6429984766b467f73e03cd125f76aaaf6af56fce784965e647096423cApprove141685112022-07-09 17:40:5583 days 4 hrs ago0xaf72e36d1d16ae80b6811a99909cb92396d18777 IN  0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether0.0001327825110.001
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0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x362fa9d0bca5d19f743db50738345ce2b40ec99f 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x362fa9d0bca5d19f743db50738345ce2b40ec99f 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x362fa9d0bca5d19f743db50738345ce2b40ec99f 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x: Exchange Proxy 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x: Flash Wallet 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x: Exchange Proxy 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x88af67b59c95eda0a9544e5c33679b128517f37a 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x: Exchange Proxy 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x362fa9d0bca5d19f743db50738345ce2b40ec99f 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xf0b757ed135fd0794a71bfba0f390ace4a5de4533870514a518fe2b339118993239844622022-09-20 17:38:0310 days 4 hrs ago 0x362fa9d0bca5d19f743db50738345ce2b40ec99f 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0xefe0d95fdeb6e002194b45989c7ba504b0578a7d82084059a6745aeb8b21bd24239493282022-09-20 14:10:0510 days 7 hrs ago 0x88af67b59c95eda0a9544e5c33679b128517f37a 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x63e29a861afdb994c3e3eef44cf22d9d40caa5671a4807cd9d2db9b1741f79a3226879972022-09-11 4:03:2319 days 17 hrs ago 0x88af67b59c95eda0a9544e5c33679b128517f37a 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x63e29a861afdb994c3e3eef44cf22d9d40caa5671a4807cd9d2db9b1741f79a3226879972022-09-11 4:03:2319 days 17 hrs ago Uniswap V3: Router 2 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x63e29a861afdb994c3e3eef44cf22d9d40caa5671a4807cd9d2db9b1741f79a3226879972022-09-11 4:03:2319 days 17 hrs ago 0x88af67b59c95eda0a9544e5c33679b128517f37a 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x7d060a2c093b9bb889ddd22e577c4c1e19410adcd63f1ae5a3ffd0de285e6138225135552022-09-09 13:41:1821 days 8 hrs ago 0x: Exchange Proxy 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x7d060a2c093b9bb889ddd22e577c4c1e19410adcd63f1ae5a3ffd0de285e6138225135552022-09-09 13:41:1821 days 8 hrs ago 0x: Flash Wallet 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x7d060a2c093b9bb889ddd22e577c4c1e19410adcd63f1ae5a3ffd0de285e6138225135552022-09-09 13:41:1821 days 8 hrs ago 0x: Exchange Proxy 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x7d060a2c093b9bb889ddd22e577c4c1e19410adcd63f1ae5a3ffd0de285e6138225135552022-09-09 13:41:1821 days 8 hrs ago 0x88af67b59c95eda0a9544e5c33679b128517f37a 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x7d060a2c093b9bb889ddd22e577c4c1e19410adcd63f1ae5a3ffd0de285e6138225135552022-09-09 13:41:1821 days 8 hrs ago 0x: Exchange Proxy 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x6024168261ad2c523af86b3ec9792e468ceed7a7307b60ba8d1415cf0be5d44d223366342022-09-08 1:38:2522 days 20 hrs ago 0x: Flash Wallet 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x6024168261ad2c523af86b3ec9792e468ceed7a7307b60ba8d1415cf0be5d44d223366342022-09-08 1:38:2522 days 20 hrs ago 0x88af67b59c95eda0a9544e5c33679b128517f37a 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x6024168261ad2c523af86b3ec9792e468ceed7a7307b60ba8d1415cf0be5d44d223366342022-09-08 1:38:2522 days 20 hrs ago Uniswap V3: Router 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x6024168261ad2c523af86b3ec9792e468ceed7a7307b60ba8d1415cf0be5d44d223366342022-09-08 1:38:2522 days 20 hrs ago 0x88af67b59c95eda0a9544e5c33679b128517f37a 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x6024168261ad2c523af86b3ec9792e468ceed7a7307b60ba8d1415cf0be5d44d223366342022-09-08 1:38:2522 days 20 hrs ago 0x: Flash Wallet 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
0x6024168261ad2c523af86b3ec9792e468ceed7a7307b60ba8d1415cf0be5d44d223366342022-09-08 1:38:2522 days 20 hrs ago 0x: Flash Wallet 0x117cfd9060525452db4a34d51c0b3b7599087f050 Ether
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x7c6b91d9be155a6db01f749217d76ff02a7227f2

Contract Name:
L2StandardERC20

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 10000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Optimistic.Etherscan.io on 2021-11-28
*/

// File @openzeppelin/contracts/token/ERC20/[email protected]

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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);
}


// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

pragma solidity ^0.8.0;

/**
 * @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 @openzeppelin/contracts/utils/[email protected]

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 @openzeppelin/contracts/token/ERC20/[email protected]

pragma solidity ^0.8.0;



/**
 * @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:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - 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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, 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 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 @openzeppelin/contracts/utils/introspection/[email protected]

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 contracts/standards/IL2StandardERC20.sol

pragma solidity ^0.8.9;


interface IL2StandardERC20 is IERC20, IERC165 {
    function l1Token() external returns (address);

    function mint(address _to, uint256 _amount) external;

    function burn(address _from, uint256 _amount) external;

    event Mint(address indexed _account, uint256 _amount);
    event Burn(address indexed _account, uint256 _amount);
}


// File contracts/standards/L2StandardERC20.sol

pragma solidity ^0.8.9;


contract L2StandardERC20 is IL2StandardERC20, ERC20 {
    address public l1Token;
    address public l2Bridge;

    /**
     * @param _l2Bridge Address of the L2 standard bridge.
     * @param _l1Token Address of the corresponding L1 token.
     * @param _name ERC20 name.
     * @param _symbol ERC20 symbol.
     */
    constructor(
        address _l2Bridge,
        address _l1Token,
        string memory _name,
        string memory _symbol
    ) ERC20(_name, _symbol) {
        l1Token = _l1Token;
        l2Bridge = _l2Bridge;
    }

    modifier onlyL2Bridge() {
        require(msg.sender == l2Bridge, "Only L2 Bridge can mint and burn");
        _;
    }

    function supportsInterface(bytes4 _interfaceId) public pure returns (bool) {
        bytes4 firstSupportedInterface = bytes4(keccak256("supportsInterface(bytes4)")); // ERC165
        bytes4 secondSupportedInterface = IL2StandardERC20.l1Token.selector ^
            IL2StandardERC20.mint.selector ^
            IL2StandardERC20.burn.selector;
        return _interfaceId == firstSupportedInterface || _interfaceId == secondSupportedInterface;
    }

    function mint(address _to, uint256 _amount) public virtual onlyL2Bridge {
        _mint(_to, _amount);

        emit Mint(_to, _amount);
    }

    function burn(address _from, uint256 _amount) public virtual onlyL2Bridge {
        _burn(_from, _amount);

        emit Burn(_from, _amount);
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://cf6f2a647337a3023928b1f0a8286454f8c5755dd6ed9bb72c21a4693b3d555b
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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