Contract 0x703d57164ca270b0b330a87fd159cfef1490c0a5 1

 
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0xc3bd24a3ebf696c848eef6e1fda14de24eb3b2b60b9a7ed62019b33c5422fd68Transfer258319032022-09-27 20:54:483 days 38 mins ago0xdbae4a204a9ee579e402c7cf9f72005ecbf8f8e4 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000665760570.00100155
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0xfb954682951af564b44564bde3860ad313e8f67e34b07a3e905d589997323afaTransfer243782752022-09-21 22:16:098 days 23 hrs ago0x0e7f3db3ad7a77ea68797203deb16f00a30674ce IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.000089282820.00100155
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0xa285f4801b0cf936c317bad9ce2276be84f0375735bc7b27dfb6930d8c032443Approve224899532022-09-09 9:21:1821 days 12 hrs ago0xf8a659a5c7f843bd927668343f9aa2bfb2905ce8 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000477260370.001
0x4546348743dbafd1bff77b0dca6619ffb148bdf88ebd5170760358d7dba9e943Approve219587652022-09-05 3:33:2725 days 17 hrs ago0x520d7ad9f4f93751fc0895329494b17ef9a1ba64 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000477936280.001
0x4b02f2deb042b77deb8b633dac20e98d700c4ee6de8b4b5fa70658c3faa686afApprove219587582022-09-05 3:33:1125 days 18 hrs ago0x520d7ad9f4f93751fc0895329494b17ef9a1ba64 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000590966750.001
0x40b52c802bdadb5f73d1d81c73ecebb8a0d7a051ce095a9b5e9ca0a6d1db7d8eApprove218148202022-09-03 13:38:4527 days 7 hrs ago0x1982bd37e91fd7a8c88805e9a7aa009fa804b1f9 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000293114130.001
0xeb529102feb10649a7783579842d58a32f7e5e8a3b62045344475c865a6b7f71Approve217598032022-09-03 3:12:0927 days 18 hrs ago0x7d3bf2cb39f5ceeeca91ecc8201dc01616ad089f IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000411277610.001
0xfcf751ceaefcdd537e52815c11c82fa6b2e3d1c5ed27c273e5424c68968e47d8Approve210352832022-08-29 15:46:1332 days 5 hrs ago 0xd8799e1a081b05b100fa18e25e4f1a7cdfcf4123 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000680338050.001
0xc0934fea6968c869d722c235ed71e865f5dee056b2e75b11771d43fa630dec01Approve207677312022-08-27 11:41:0234 days 9 hrs ago0x9c35d50a7d1ef9cd1c2e60fa48e5eae00101ef1b IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000274480990.001
0xdd41b36ce9ae72fa711a58597f7fd1a9a42f96f72e06c6bdc233c6146854af95Approve204077402022-08-24 10:33:4537 days 10 hrs ago0x2446f1a75162f045d02f23d1d3b0f5a2c0f9a4cb IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000291006960.001
0x9044847b8c854acbfaa2146e0da472c04407ad0fc07441b01711b66ff6008793Approve202210732022-08-23 0:43:2538 days 20 hrs ago0x0c71de0cf6b3947edd6f09bb77e346e24d7c0fd0 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000375783180.001
0x9f3c5b4cc4569acd1db3f406785460468a42410b281f57daf8d45d219fe79c0bApprove201691612022-08-22 13:34:0539 days 7 hrs ago0xd73ffb49c0fcaef216299dcb8cef6012f117672e IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000701379990.001
0xcfabdf0533071b9072bf4cf88afd348288b2fe3d033178a0895994e36e40f61fApprove196980742022-08-19 2:31:5342 days 19 hrs ago0x73c0b52019d3af9ba98666213a3952be2482f3fd IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000539025770.001
0x1db61d72e81797ba7458b64786430414829d21c8ee1ed50fafc591cba48688aeApprove196184532022-08-18 12:09:1743 days 9 hrs ago0xe366619833126918f7fd3bdf516002bdadf1ae5f IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000345095310.001
0xd5011cd4d63864a9f75ed72e790c8ff0912bed8dda4fb2b8371d2b1dbef410acApprove194162162022-08-16 20:24:3245 days 1 hr ago0x84323c7139af855de059dc08eb4a9a1c94f2b42b IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.00005387820.001
0xb1540ce5a41434ee2f9d2703e41a68a4f27e3858620c868d8ba0fc4c2ff63d71Approve191961762022-08-15 14:44:2246 days 6 hrs ago0xcf5702d56146120cda2d546aadb2a5710400d5ca IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000637260040.001
0x36fc1eca6fa2541bcf19ccf5508b76990cff81ab875bc43474664bc06a0625bbApprove191330852022-08-15 3:17:5946 days 18 hrs ago0xf8a659a5c7f843bd927668343f9aa2bfb2905ce8 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000676797080.001
0xedfbde571140b3fdc80b416e30c2ac26c0351f7a7c25796bdb4f010ae2d64c4eApprove190718212022-08-14 13:21:1147 days 8 hrs ago0x8294207eb273e830769c4eb02e9a1ed9ba5f5c03 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000330636090.001
0x72d3fd4481cf102848a6b6d9360df8fbc0d3ad3403e5f2b95d5b4997c701efbeApprove190700822022-08-14 13:03:4047 days 8 hrs ago0xcdd5de580d6bb26a9f97d161243066e913ce3d5b IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.00008255390.001
0xbf703452f1b81e27e19a0a833ae439237d914527a9d048a7e06a2f5a7dcf145bApprove190612722022-08-14 11:03:3347 days 10 hrs ago0x034abb3ff301cce6159b8923476efaa023b95770 IN  0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether0.0000283388790.001
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0x857e0385b0cc109fc53af9f752affbbc726268fa75f2961dafdf50cb884d151b265476782022-09-30 17:35:213 hrs 57 mins ago 0xfae40c4c71002499e037756612c48e51de6974c1 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
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0x857e0385b0cc109fc53af9f752affbbc726268fa75f2961dafdf50cb884d151b265476782022-09-30 17:35:213 hrs 57 mins ago 0xfae40c4c71002499e037756612c48e51de6974c1 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
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0x857e0385b0cc109fc53af9f752affbbc726268fa75f2961dafdf50cb884d151b265476782022-09-30 17:35:213 hrs 57 mins ago 0x7ea8c22e6dcd7bd69eb180664da68e1f1f11d696 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
0x857e0385b0cc109fc53af9f752affbbc726268fa75f2961dafdf50cb884d151b265476782022-09-30 17:35:213 hrs 57 mins ago 0x7ea8c22e6dcd7bd69eb180664da68e1f1f11d696 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
0x857e0385b0cc109fc53af9f752affbbc726268fa75f2961dafdf50cb884d151b265476782022-09-30 17:35:213 hrs 57 mins ago 0xf220408d5f8cf3a2d43126d3413fe3acbdf94363 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
0xe4d3faf7e6a064bc493a80d4baf53ad36eb0d52eda902cf52a88ffef49018d8a265475962022-09-30 17:34:513 hrs 58 mins ago 0xf220408d5f8cf3a2d43126d3413fe3acbdf94363 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
0xda5dd3cbb6c3c1df88ea153f0dee4effe1f809ff031e31e0070725d1107377a9265397292022-09-30 16:34:234 hrs 58 mins ago 0xf220408d5f8cf3a2d43126d3413fe3acbdf94363 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
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0x0b62186f4906c39c9082c7bc8b50612e94b2f9ab8e41d7ef0c4140c85fa2fa13264364222022-09-30 8:58:5412 hrs 34 mins ago 0xf220408d5f8cf3a2d43126d3413fe3acbdf94363 0x703d57164ca270b0b330a87fd159cfef1490c0a50 Ether
0x95627c9747fd1a498d4ebded49844f423bdfa7492fccd8530121d297b6d92d99264344542022-09-30 8:52:3912 hrs 40 mins ago 0xf220408d5f8cf3a2d43126d3413fe3acbdf94363 0x703d57164ca270b0b330a87fd159cfef1490c0a50 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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