Contract 0xaf8cA653Fa2772d58f4368B0a71980e9E3cEB888 8

 

Contract Overview

Tellor Tributes: TRB Token
Balance:
0 ETH

EtherValue:
$0.00
Txn Hash Method
Block
From
To
Value
0x80a8146f71a9a7f0db4f991c8b1399f97b19a600f619f7fb7f7a50fe4f280d09Approve1089107842023-08-30 18:32:2528 days 18 hrs ago0xb0ea6bbdb88b0dcadf5e6980a9be5410f6c72b7d IN  Tellor Tributes: TRB Token0 ETH0.0000541708680.10000006
0xdcf18864ebfdcd9d84800b688e47f31550a4b9ab3c4e16c776ff9fd048105db5Approve1088385272023-08-29 2:23:5130 days 11 hrs ago0x3ae4380d82d9b7b30acba045bdc4eb2d84dab352 IN  Tellor Tributes: TRB Token0 ETH0.0000459866390.100000056
0xd1d6746ae4b9600059c7921aaa20e2e58bb8a4a9c5ef6ec9c37095c49399537cApprove1088142492023-08-28 12:54:3531 days 36 mins ago0x465db1fd81aecf89e1688933695af35b20d566bb IN  Tellor Tributes: TRB Token0 ETH0.0000576050510.187399088
0x527a3c8a062a7207992bfca5e0a1c3a32936475765364406927be10a96f0eebfApprove1088068152023-08-28 8:46:4731 days 4 hrs ago0x0db9c9e57fe4e4d32d7e347fb02ce18329ad1dab IN  Tellor Tributes: TRB Token0 ETH0.0000603548450.201051414
0x808874177ecdb8ed36f328d91b8a992ed0ce8795b130af68c042e5d8613c05a5Approve1087532352023-08-27 3:00:4732 days 10 hrs ago0x632d1d3906f2f4ae182c60143dae516aed6ddc1d IN  Tellor Tributes: TRB Token0 ETH0.0000270122920.100000053
0xfd441954fe97d58fac598ecc4ebf8a9ca23dc82b1e214ec7c9ea9e54f96d9621Approve1084358112023-08-19 18:39:5939 days 18 hrs ago0xcebd2f1dbfd8855656083ab1d28f73eda8b210e9 IN  Tellor Tributes: TRB Token0 ETH0.000034148510.100000057
0xb4dbdd9d420bf75a4d506625a9e7e352809c0a2cd62977aa32285acaf1845d00Approve1084090752023-08-19 3:48:4740 days 9 hrs ago0x0dcf8f7789ad7c6d87e0e0ebbd6451aacbb8dcdd IN  Tellor Tributes: TRB Token0 ETH0.0000325855010.100000066
0xb99bb4b3a8d3166a47f311f37f931fc022e6ad1cf8f85e3419d48e9ff2f43b1bApprove1077009272023-08-02 18:23:5156 days 19 hrs ago0xb9b508edd930c51566d2a9fc55d40b016d19d26b IN  Tellor Tributes: TRB Token0 ETH0.0000599270160.006007306
0xc3ae1b2c04235f7d2f6ff8dda726aa9b278e3fe90ac969d4c482e45f22a50064Approve1077005822023-08-02 18:12:2156 days 19 hrs ago0xaac7da260fb6d047314e213f672b7d3d9503a1f7 IN  Tellor Tributes: TRB Token0 ETH0.000070231190.000180216
0xbf2627a3ab1b8cb3530818c2cb4c605dfcbf1e481fdf6536235f8d0ea7b1b080Approve1070014212023-07-17 13:46:5972 days 23 hrs ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001142021441.500712894
0x057e2527ba390f40841a0eb203d54cd0236cab47238067243f6af0d921517862Approve1070014112023-07-17 13:46:3972 days 23 hrs ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001158628881.500791275
0x2afa9ad62e37a2dfa9e6b7bee77cabce2888b5818da25897c7ef5b90bee3bfa8Approve1068735282023-07-14 14:43:5375 days 22 hrs ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001402657281.506627627
0x6398395df55e1532af77665c8c4a8765c2a04bdcc124ff29f3a3953de8ad46b6Approve1068271672023-07-13 12:58:3177 days 32 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0000961418041.50000025
0xc8fa3679e7f6113df0ab8111a7be63973fb0169c7cbdedbbd829dd2f7e0d584bApprove1068271572023-07-13 12:58:1177 days 32 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0000961900521.500000261
0x96797aab11f28d33a3eab890b81f448419691816b824f115cec6840a7753c6abApprove1067849022023-07-12 13:29:4178 days 1 min ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001244751021.500001312
0x060ecf174b02ffd65d354d6ab9844a5e9a867921df9a3e469daa17b7ca26b86bApprove1067848922023-07-12 13:29:2178 days 1 min ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001211611161.50000141
0x5fe328f2c2f3a2756696cef60f59806c1d0362f26a8489ed0d156d978467d5aeApprove1067848822023-07-12 13:29:0178 days 2 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001229211481.500001429
0x6f4b222beadc2ab26447b42cebb368782c8e1321600d28efa96bc345f992b496Approve1067848712023-07-12 13:28:3978 days 2 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001226936911.500001404
0x8e007cee1122eef4e03393d033034f76b7d21140660eacb6e02d604fe9af4e38Approve1067848612023-07-12 13:28:1978 days 2 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001220633681.500001475
0x2b170ece0fee9db198318539d9e5a9552844fb58730b176ccc71c2cd2a631760Approve1067848512023-07-12 13:27:5978 days 3 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001208536721.500001471
0x8a1c93e1ef74c1d4bd05f1ca9cddba12a8558e8161efe5ac329fdc8e4e93e4c8Approve1067848412023-07-12 13:27:3978 days 3 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001219652831.500001314
0x700a4370ed48a018e826df8954c182395e478c20b2b9e501b3dc9be6d9d5434aApprove1067848312023-07-12 13:27:1978 days 3 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001241464211.500000815
0x2c46cf935bcf411154edad53dfbcdeace780e36c8556b2d6556b8b66e7c95abfApprove1067848212023-07-12 13:26:5978 days 4 mins ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001265216631.500000804
0xa4dee38daa06869606fd5af38ee2d41b3a2e18c8d4add666f8bc05c2e5ba16b4Approve1067479792023-07-11 16:58:5578 days 20 hrs ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001277219061.500000088
0x05aa71ae8146775fb6772c6613de65ba6492842688d9d096831ddc299b8658abApprove1067479692023-07-11 16:58:3578 days 20 hrs ago0xf288eb2539bfe8883747fa4513f1613e98cfc33b IN  Tellor Tributes: TRB Token0 ETH0.0001300539741.500000096
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OVERVIEW

Tellor is a transparent and permissionless way for smart contracts to easily get any data whenever they need it.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x079d2a9e9bf85db924aa0f2adc0630398c87569f2124c2a053aa1d7e987582871075516802023-07-30 7:28:5760 days 6 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0xf299448a1f75a7434c37fe04b3153109f275151e14c2a4db955a01fbcb7556021075516722023-07-30 7:28:4160 days 6 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0xe7b18d5c7965add73e0ff29066f0768502bc4c3619829313672a32999dbae9cc1075514822023-07-30 7:22:2160 days 6 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x010a12078de3839edc1b21824ebe9cdf12086f8df28c6a6fa68e1fa76a6763341075446782023-07-30 3:35:3360 days 9 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x5e42f4a3697f60bceb10b6ab54bf202368416c9c6a17f9aca2c14059f87cb2a01075446702023-07-30 3:35:1760 days 9 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x3a8665347fc319990c7c6d8b3e0ddeb3594fc720e746672e460b7a0a8373c1451075444812023-07-30 3:28:5960 days 10 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x7f78ed3a7a703bcab928be3afbbe29e5255b4975f893d123d8a04c0e875505b81075376762023-07-29 23:42:0960 days 13 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x1b41ab5c67ad40b8abe4e80c62ee26f18eee6d4da58fa9b2d5761c0f029a7d331075376682023-07-29 23:41:5360 days 13 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x401f8b19de434af5083736bddbb37f21126226e1db7b9628f6f7646b5902726b1075374792023-07-29 23:35:3560 days 13 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x7c7e0fb7c64f5dfd5cd5c67e01dfbd1997ceca0863464d1836675454bbe52ea11075306742023-07-29 19:48:4560 days 17 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x9a1b3ef8ee91b917b001153472200f6c0ca99230b383f67d1dd3b5ca5570fd231075306662023-07-29 19:48:2960 days 17 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x0ba359e975ac24061c4fa672788d81ff91168f9a077d2907953f7df78cfbcffe1075304772023-07-29 19:42:1160 days 17 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x107cf94d9f208a07a9ad365f74cc4480f92be0c7439790a0a941c1b01a8a46f51075236722023-07-29 15:55:2160 days 21 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x7e0d8090590cdaa6ae4ec5721e9900e5795a94beb79fb1b85b4ca4cbc0426ca21075236642023-07-29 15:55:0560 days 21 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x4e8f0e44a575dc557bb5cd41f3ad178e9f734529d9f2d0d1dcd36d0ef86fc8d71075234752023-07-29 15:48:4760 days 21 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x512519ec19abcf5fa1a74c4ebb2d16840284f963cbc79bb67de2e13985cc08fb1075166702023-07-29 12:01:5761 days 1 hr ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x766297253559d7c7f4c0c0bf8084988f6d05953947db24f246aac92581708e991075166622023-07-29 12:01:4161 days 1 hr ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0xa3e28835f39fd690d597fa8fc2cfc937b61e5904d93258f429d9bf5f3dc398511075164732023-07-29 11:55:2361 days 1 hr ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0xbfe9f72adf01e435c9b040c145579ab42f042cc82a70f95bc963a39e4ed5b8f11075096682023-07-29 8:08:3361 days 5 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x6d27328f0efa8d7fc1dde753aeedd76fb00429d2e929a145a51b698d2af4d7ba1075096602023-07-29 8:08:1761 days 5 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x044e86b8b0c39a32472f783a0303d5013e2b22cb43ad0f2450ca5f38b5f9d6c01075094712023-07-29 8:01:5961 days 5 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x35c9f38ced35878ecdcd5d4d00e65ed1b4984d8a09204d360f35c0e4b025b9ee1075026662023-07-29 4:15:0961 days 9 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0xc486b6125c880e759b3aaa15dacb65af42bfa0c3a192a85a0383e7e19b535fe81075026582023-07-29 4:14:5361 days 9 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0xf7ff33ce311f4bd452a484de0c421d565fa4218f36d2f41f363d8096c620c2731075024692023-07-29 4:08:3561 days 9 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
0x28276dc776b58bed9b2d3a74f2dbc82835862cf61c190b52e727ef95554f3dcf1074956642023-07-29 0:21:4561 days 13 hrs ago Tellor Protocol: Oracle Tellor Tributes: TRB Token0 ETH
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Similar Match Source Code
This contract matches the deployed ByteCode of the Source Code for Contract 0x7c6b91d9be155a6db01f749217d76ff02a7227f2
The constructor portion of the code might be different and could alter the actual behaviour of the contract

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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