Contract 0x9e5AAC1Ba1a2e6aEd6b32689DFcF62A509Ca96f3 24

 

Contract Overview

dForce: DF Token
Balance:
0 ETH

EtherValue:
$0.00

Token:
Txn Hash Method
Block
From
To
Value
0x29a077b792c283de82d48f10d19fc815d14f5e401ab482e73584c6ab875c23efApprove1180497572024-03-29 7:44:514 hrs 46 mins ago0x81f10d99464d604ea1e9242dc71733a506e95b4e IN  dForce: DF Token0 ETH0.000001399180.030531019
0xdce14d1b5e5e7f81196517ef987f5da34ca27378eee8fabebef4de983bad8636Approve1180212022024-03-28 15:53:0120 hrs 38 mins ago0x00b9f45b39896c6632b0213735d092eabde44d37 IN  dForce: DF Token0 ETH0.0000108042560.0309512
0xc35b67da33ffff4565e8e04c95746f4aff2b5605eeca2e5d16579f6391b27bb9Approve1180139162024-03-28 11:50:091 day 41 mins ago0xaf11495f021c5c2c5f5230f40d5d57ebe4059700 IN  dForce: DF Token0 ETH0.0000043366980.035299
0x4f566cd69724101fa4f040f9050cca108bf9abb07547c4137b59962d146b93c0Transfer1180099052024-03-28 9:36:271 day 2 hrs ago0x2a1109214e8d16bd026ee7e02452a21db78caafe IN  dForce: DF Token0 ETH0.000004404730.029148684
0x200fa50ba0ccc5b5d9b0908c2138fe87eb2082b08f8f23b3c01a6de9160faa87Approve1180092362024-03-28 9:14:091 day 3 hrs ago0x35e2a11f743a43f00381a0aeb6764322ef1eb788 IN  dForce: DF Token0 ETH0.0000060761660.0354999
0x61d638a82c6d2e121bf06c0a64584f3155c5aec200f89c7c5aa076c3a6151e18Approve1180050652024-03-28 6:55:071 day 5 hrs ago0x35e2a11f743a43f00381a0aeb6764322ef1eb788 IN  dForce: DF Token0 ETH0.0000060587750.04698
0x9f7b63bab4b6fa5f6a33a4edec21f74e36f4545804c3c5379e4c3be490c7d383Transfer1179994742024-03-28 3:48:451 day 8 hrs ago0x9260b8321f7e8dfa7b3dfebb0167058d7eec1966 IN  dForce: DF Token0 ETH0.000002502880.03061855
0xdf88348a72dd9c93a22a814fab17ee4ef3ff2a7f2e815d4e4be43471c4820d9cApprove1179944682024-03-28 1:01:531 day 11 hrs ago0xc23e524325d26e429f749316d6b3115f199a4b78 IN  dForce: DF Token0 ETH0.0000036789820.0306678
0x8b061e2dffae8426230ae6fa31a949ef04454747e76c6f9aa519d203f66b4686Approve1179861152024-03-27 20:23:271 day 16 hrs ago0xef0c7668af2e04bc8cb8dfa321e5f9159f4bafe4 IN  dForce: DF Token0 ETH0.0000030549150.0299662
0xfe2e86ba4b79736e8d54d0df80bb1062a1888124690f00210dcd9fed5bd49eefTransfer1179810862024-03-27 17:35:491 day 18 hrs ago0x504db0a01caf27fa108e0245f12af3504642148d IN  dForce: DF Token0 ETH0.0000189594650.029375149
0x1516ecfec4a07b550d3c0d0e30e5ba9e963f4e7f43c16131068f65c73c0d4c04Transfer1179810592024-03-27 17:34:551 day 18 hrs ago0x504db0a01caf27fa108e0245f12af3504642148d IN  dForce: DF Token0 ETH0.0000183963720.02924776
0xb608c272cb0c9e0d4bcb7b5ce13bdf57a592b39c52f79c11e967a7e30b43c96bApprove1179684322024-03-27 10:34:012 days 1 hr ago0xe0eae533863f6818342fa589f7b466fc3bcbbb74 IN  dForce: DF Token0 ETH0.0000007468990.014212973
0x1a64d5e69d7c43c10ab34ae75503b4adb0afbff5dd9cb679094e432642a13eccApprove1179683582024-03-27 10:31:332 days 2 hrs ago0xa055c6059fd7d8addc88a586b843606052b67513 IN  dForce: DF Token0 ETH0.0000005013150.014431397
0xc9e6df84964b7449b4c017fa5b623cb8c45144632a0912233fad704544caa613Transfer1179680812024-03-27 10:22:192 days 2 hrs ago0x9260b8321f7e8dfa7b3dfebb0167058d7eec1966 IN  dForce: DF Token0 ETH0.0000008449650.015029148
0x64f1f1a7632f9552983884247a03d6e8849df8f614b53ca7e5f93560834b6917Approve1179577332024-03-27 4:37:232 days 7 hrs ago0x1d58328205429d39ce21a13dcd3feb73180c9b20 IN  dForce: DF Token0 ETH0.0000007359520.0145304
0x95347d15f2f16d9fce889c785f9bef017f58879a4362dee7da82fbed151a36ccApprove1179467492024-03-26 22:31:152 days 14 hrs ago0x6b8b01df86bfaaf79dda038009fc5597425ad0cf IN  dForce: DF Token0 ETH0.0000014406240.028789541
0xcffe449e494a4c28ce45b0f0c794a0c6bfbbc67312d6997dadc406d21be2382fApprove1179335342024-03-26 15:10:452 days 21 hrs ago0x35e2a11f743a43f00381a0aeb6764322ef1eb788 IN  dForce: DF Token0 ETH0.000002049680.039772
0xcb03942d4659704125864c3598bf49403f68184e1adfac906a2c633e0f3d476dApprove1178688772024-03-25 3:15:314 days 9 hrs ago0xf233ccb7960aaf379d19189ab403b1b4ab8bfcc1 IN  dForce: DF Token0 ETH0.0000003888780.00711831
0xb9aecbb1ad115612dd00e1e1b0ae88d9eb23bf693e9af1ea3d990c3d5b6b6893Approve1178440002024-03-24 13:26:174 days 23 hrs ago0x29909723c27164df308264940e6b5491e24b4584 IN  dForce: DF Token0 ETH0.0000003776850.006381151
0xc839f9a4b9905ad8bdf737ec405194f224aa02d6609fc93813dc0552c6108daeApprove1177818432024-03-23 2:54:236 days 9 hrs ago0x05e09d942505764bca4475abf8efdbc21d1c535b IN  dForce: DF Token0 ETH0.0000005140750.0097918
0x9eff3b0091c8752aec944f812f74750c887feb63a87ac6e3e66e7f1d89c94639Approve1177622362024-03-22 16:00:496 days 20 hrs ago0x8074ed7aea09a7f371af44dabd4de6c42839929b IN  dForce: DF Token0 ETH0.0000007626060.014116396
0x651270e17cd07a03f775d8d806295771362bfb11885bf96ebf4d7f07a27d3077Transfer1177505112024-03-22 9:29:597 days 3 hrs ago0xe2d54c3d2e9b3914e8ff88eab605d4b0efe22265 IN  dForce: DF Token0 ETH0.0000003845150.00655365
0x2171623a8c4c925c7f35a5d6fcde5f627f84801027bdca5416636ecfca251cc5Approve1177479272024-03-22 8:03:517 days 4 hrs ago0x8074ed7aea09a7f371af44dabd4de6c42839929b IN  dForce: DF Token0 ETH0.0000003689130.005998493
0x701f6002e58e4bda724a1407b2640fdbc20f5f60e9477da67f633880bee77b16Approve1177086172024-03-21 10:13:318 days 2 hrs ago0xe0eae533863f6818342fa589f7b466fc3bcbbb74 IN  dForce: DF Token0 ETH0.0000005312990.009129171
0x9ced7da76666afd18ae06e451e0a6ad3bdcfb3928c52cbc6c7993ed8be6c577bApprove1176987402024-03-21 4:44:178 days 7 hrs ago0x8b129d184b11ac30205e1dc3866a181649efde64 IN  dForce: DF Token0 ETH0.0000003725660.006004781
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OVERVIEW

dForce advocates for building a complete set of DeFi protocols covering assets, lending, and trading, serving as DeFi infrastructure in Web 3.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xff9ee9fb793730f8fd88a19c93e45506e29d90085b547cad3b7c384101e0edf01075581172023-07-30 11:03:31243 days 1 hr ago 0x25c488e5f69ac334ac1e8f786d890a97ec1bf713 dForce: DF Token0 ETH
0xff9ee9fb793730f8fd88a19c93e45506e29d90085b547cad3b7c384101e0edf01075581172023-07-30 11:03:31243 days 1 hr ago 0x25c488e5f69ac334ac1e8f786d890a97ec1bf713 dForce: DF Token0 ETH
0xff9ee9fb793730f8fd88a19c93e45506e29d90085b547cad3b7c384101e0edf01075581172023-07-30 11:03:31243 days 1 hr ago 0x25c488e5f69ac334ac1e8f786d890a97ec1bf713 dForce: DF Token0 ETH
0xff9ee9fb793730f8fd88a19c93e45506e29d90085b547cad3b7c384101e0edf01075581172023-07-30 11:03:31243 days 1 hr ago Velodrome Finance: Router V2 dForce: DF Token0 ETH
0x545deaf0209b9f5d757e6a83ec9921405e4f4e46acbaf83c3a415c37705b91441075580782023-07-30 11:02:13243 days 1 hr ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0x545deaf0209b9f5d757e6a83ec9921405e4f4e46acbaf83c3a415c37705b91441075580782023-07-30 11:02:13243 days 1 hr ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0x2f670a071702ba7e73ac7522f9dd36e0d3cf938214979469056f46e7adb15bd91075468972023-07-30 4:49:31243 days 7 hrs ago Velodrome Finance: Prices Oracle V2 dForce: DF Token0 ETH
0x8ad3f62d862cdf4f1d2e8c5973988fc725fc69939fe3b1d3eec021713be1a5851075420312023-07-30 2:07:19243 days 10 hrs ago 0x3eff6dec1e223960a9302ff811026ae93c737498 dForce: DF Token0 ETH
0x41bbb50ecb01acc159250ca867a5cdbf28d9e219d8eeeb2390408c6122c5239b1075290622023-07-29 18:55:01243 days 17 hrs ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0x41bbb50ecb01acc159250ca867a5cdbf28d9e219d8eeeb2390408c6122c5239b1075290622023-07-29 18:55:01243 days 17 hrs ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0x41bbb50ecb01acc159250ca867a5cdbf28d9e219d8eeeb2390408c6122c5239b1075290622023-07-29 18:55:01243 days 17 hrs ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0x41bbb50ecb01acc159250ca867a5cdbf28d9e219d8eeeb2390408c6122c5239b1075290622023-07-29 18:55:01243 days 17 hrs ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0x41bbb50ecb01acc159250ca867a5cdbf28d9e219d8eeeb2390408c6122c5239b1075290622023-07-29 18:55:01243 days 17 hrs ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0x41bbb50ecb01acc159250ca867a5cdbf28d9e219d8eeeb2390408c6122c5239b1075290622023-07-29 18:55:01243 days 17 hrs ago 0x6832364e9538db15655fa84a497f2927f74a6ce6 dForce: DF Token0 ETH
0xbb6552e19410de6a236cc822d51ee0c4c78d1727c3519c6982ffdbf42fc2ff791075290452023-07-29 18:54:27243 days 17 hrs ago 0x870ac6a76a30742800609f205c741e86db9b71a2 dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0xf8edf2da8fcf610cf77235d3f90cc110723159aa dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0xf8edf2da8fcf610cf77235d3f90cc110723159aa dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0xf8edf2da8fcf610cf77235d3f90cc110723159aa dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago Velodrome Finance: Router dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0xc96d8799be9cf659c76ef23e886fd1d8cb73c733 dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0xc96d8799be9cf659c76ef23e886fd1d8cb73c733 dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0xc96d8799be9cf659c76ef23e886fd1d8cb73c733 dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0x819f6fbd91d99420794adefdb1604bfc3182ac39 dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0x819f6fbd91d99420794adefdb1604bfc3182ac39 dForce: DF Token0 ETH
0x02bf81bf93769b3bbb112d3ff79c3c0c4b2227a5eec45e0391ebe0d85b76504f1075238222023-07-29 16:00:21243 days 20 hrs ago 0x819f6fbd91d99420794adefdb1604bfc3182ac39 dForce: DF 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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Deployed Bytecode

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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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