Contract 0x350a791Bfc2C21F9Ed5d10980Dad2e2638ffa7f6 6

 

Contract Overview

Chainlink: LINK Token
Balance:
0 Ether

EtherValue:
$0.00

Token:
Txn Hash Method
Index
From
To
Value
0xcb33d4b7cffd1dc643afb871cf1efddf7b696242e895fcf6988d61fb98afe6ebApprove86555832022-05-20 9:24:441 hr 29 mins ago0x77a399d1309b93e66e603caa1d50081c33ccbb9a IN  Chainlink: LINK Token0 Ether0.0000436617120.001
0xc39000cfaee3075ffe5f8650c62c4f7126093ad7686d496d3c066d8e7b0453beApprove86550642022-05-20 9:15:291 hr 38 mins ago0x1ae26aa4c56475120945469004bc87418e03c908 IN  Chainlink: LINK Token0 Ether0.000045334580.001
0xb0b8267a4f448de5acb9d9d6c871fbab3eb52fdfca149fa5bea9375087dd2e63Approve86519632022-05-20 8:10:162 hrs 43 mins ago0x27b90f50c745b21b1d2988eb1bc6730246ec7554 IN  Chainlink: LINK Token0 Ether0.0000890352360.00115
0x3a86de9a94cf45f160c510b0713e85704f3a0a4056bb9df8a6fb371ee7af54c1Approve86519572022-05-20 8:10:162 hrs 43 mins ago0x27b90f50c745b21b1d2988eb1bc6730246ec7554 IN  Chainlink: LINK Token0 Ether0.0000890282560.001
0x17f7878dda200a352fe40574cc7dacb95ab52e101eb9025d3402dd65b2df0f22Approve86436842022-05-20 4:41:446 hrs 12 mins ago0xe67ca13b761b662485176a9ce3197383f786d792 IN  Chainlink: LINK Token0 Ether0.0000600825010.001
0x1933071a44bb1189a0353d07b3bf20da40162e70792f94aa186784e7dedc39a5Approve86300282022-05-19 22:37:2512 hrs 16 mins ago0x04981a8e509eb86ff73b20b39e483728f168f311 IN  Chainlink: LINK Token0 Ether0.0000658140510.00115
0x9812623a3db8dfc73458354433b91e08db86339d75114793a581cd5033e72cdaTransfer86221082022-05-19 18:35:0016 hrs 18 mins ago0xf663a1d22ec5cec99c4bb404ec3e948895afcd73 IN  Chainlink: LINK Token0 Ether0.0001005241820.001
0xb301054bcbfc541056c432e71f803b324c3a087f0ba370676a12ee77190a5245Transfer86220502022-05-19 18:33:4016 hrs 20 mins ago0x83bc3055649f9a829bebeccbc86e090d6a157161 IN  Chainlink: LINK Token0 Ether0.0001011689790.001
0x0e68d9497b2787822445573e397b810273eee049e4bf3028bbd374ff5f68b303Transfer86218882022-05-19 18:30:3316 hrs 23 mins ago0xf731d0c6c1e9d0f8987be52540e37f0303743da0 IN  Chainlink: LINK Token0 Ether0.0001427120420.001
0x05caf5a1ff06026306cf3b8d3f9a12e4a43e3b75da4ff348a2170b5b9abf228bTransfer86218152022-05-19 18:29:4616 hrs 24 mins ago0xf731d0c6c1e9d0f8987be52540e37f0303743da0 IN  Chainlink: LINK Token0 Ether0.0001427120420.001
0x7e52f193e76cecf22e5c947b2ed551c3bfc36c5952f31362039af8a32e6b8547Approve86167012022-05-19 16:34:3218 hrs 19 mins ago0xdfb34114abdb32d105a4551117a151c4fdf89a33 IN  Chainlink: LINK Token0 Ether0.0001449632390.00115
0x05282f6b17a607643b498a13b2a533714d882f367ae36b1a5ca48bf96c970aadApprove86148692022-05-19 15:57:3118 hrs 56 mins ago0xebd53184feaf310050c37a2c71fd93f49242d5b8 IN  Chainlink: LINK Token0 Ether0.0002233127510.001
0x1795094294eaac909c1ef9beb6c6939ed204a108bcfc10b1815076473efa94ffApprove86097142022-05-19 14:36:0820 hrs 17 mins ago0x2c98bc5f05071860613f0667d4f816671c177449 IN  Chainlink: LINK Token0 Ether0.0001365129690.00115
0x5ad7ce913f33bdb2c72ec16c1f67ddda840ba9a090e15e470c6aed40ed7d428dApprove86025712022-05-19 12:58:2321 hrs 55 mins ago0x26538410190c473cc03a5e0ac617af55d50f7e31 IN  Chainlink: LINK Token0 Ether0.0001000646960.00115
0x9e309935c9263899385adf7be74f4cfe837c0f89396f28e1bcaf3d06ab95fa4cApprove85945932022-05-19 10:59:1123 hrs 54 mins ago0xedfe14fceb460cdb4b3b0128e073631165dbfea8 IN  Chainlink: LINK Token0 Ether0.0001152504980.001
0x3273690842823050d5244403702d645af78605ce59b98b06bfb57978e75b0b89Approve85933572022-05-19 10:43:551 day 9 mins ago0x6176582d33b9738c71f25114b65517320d1165c3 IN  Chainlink: LINK Token0 Ether0.0000820570040.001
0x0231d670529bf976d20a970468d392aa01e710bf3f5b51ee3a676fd51a4d1a43Approve85923282022-05-19 10:27:321 day 26 mins ago0x111ee413424e68b7dcce6804b448690dab536a76 IN  Chainlink: LINK Token0 Ether0.0000724265340.001
0xd2746db51acc441de5b6abb38cef5727b36441fb38ba379a968c3191b497eae3Approve85913472022-05-19 10:03:291 day 50 mins ago0x48f57a9a6ab95f4c5a554c3203bb9aaaa0c0ec46 IN  Chainlink: LINK Token0 Ether0.0000735715710.001
0xf7300cadc9867c53947dc701ef40ac3433b8c170d677c0e18080700ca88c69c9Approve85907982022-05-19 9:51:361 day 1 hr ago0xe9961f2a9d3a4f65e40cc6e2ad1c64d3581ed890 IN  Chainlink: LINK Token0 Ether0.0000902410110.001
0x1862b8c0b563cac5e8895a51a2e08de76c1a4a2074c4c28d427c7e336ccdceb8Approve85907302022-05-19 9:50:281 day 1 hr ago0xe6fc1aa6a8213c20a0984f3b19de608ed75c0920 IN  Chainlink: LINK Token0 Ether0.0000701413030.001
0xefaae9c1f5e71a4d2bbd70d409204bb598ca8b65e9c30df88f4d0e3606b5cd9bApprove85905852022-05-19 9:49:281 day 1 hr ago0xe12d83cfbdbf7c3e97f47ca3ca3098ea017347cc IN  Chainlink: LINK Token0 Ether0.0001057908430.001
0xae0d011e54cffbb42b85f6a51b650302a6a2ec28400924917ae5c5927978c61bApprove85902342022-05-19 9:44:431 day 1 hr ago0x6c2e47aca7f7e23f3ce8f1606cfaa157b5583c04 IN  Chainlink: LINK Token0 Ether0.0001454725880.001
0x182fe128147e9ed7af0e4e112bdb69f0c6b17ea178369a03380824baebfd0755Approve85886182022-05-19 9:12:471 day 1 hr ago0x54775dc180c59d5acb19a1a751e2c9413e591eb6 IN  Chainlink: LINK Token0 Ether0.0000671477520.001
0xc2bf4bfec22e96d76fa0658953bd98a5998f20625fd2f9e791c123d952f17b71Approve85844992022-05-19 7:52:111 day 3 hrs ago0xe020b19fc538c84b4e2377967d5cea107097bd2e IN  Chainlink: LINK Token0 Ether0.0000716890690.001
0xab90e55e7b42a37aef583b9618a1ec638dfd00099f224393902be6b36b3616beApprove85834462022-05-19 7:28:111 day 3 hrs ago0x3b28d7980152ce3d86c3baecf4ee12d160d37354 IN  Chainlink: LINK Token0 Ether0.0000645581960.001
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x39b66a9a41f3cd82b675593398a9c8039eb57bf215ad6e38a091071a29d4627686593612022-05-20 10:46:317 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x39b66a9a41f3cd82b675593398a9c8039eb57bf215ad6e38a091071a29d4627686593612022-05-20 10:46:317 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x7bf69c10c8672330cb85eff4617d3602f624ed471ff26d03712146a610f2aab486579062022-05-20 10:12:5840 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x7bf69c10c8672330cb85eff4617d3602f624ed471ff26d03712146a610f2aab486579062022-05-20 10:12:5840 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x7bf69c10c8672330cb85eff4617d3602f624ed471ff26d03712146a610f2aab486579062022-05-20 10:12:5840 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0xb61dcb09d15629f2e3c426ae3cd1da654f6be2148cef4f3f61a32e6a9795c62b86577342022-05-20 10:09:3644 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0xb61dcb09d15629f2e3c426ae3cd1da654f6be2148cef4f3f61a32e6a9795c62b86577342022-05-20 10:09:3644 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0xac6cc46fb493d5df1a6f9485d963351812e1d6a6be179502bf3f6bed76a944b186567552022-05-20 9:49:051 hr 4 mins ago 0xbf595eb9a512b1c274125264aef84a2847158eb3 Chainlink: LINK Token0 Ether
0xac6cc46fb493d5df1a6f9485d963351812e1d6a6be179502bf3f6bed76a944b186567552022-05-20 9:49:051 hr 4 mins ago 0x94bc2a1c732bcad7343b25af48385fe76e08734f Chainlink: LINK Token0 Ether
0xac6cc46fb493d5df1a6f9485d963351812e1d6a6be179502bf3f6bed76a944b186567552022-05-20 9:49:051 hr 4 mins ago 0xbf595eb9a512b1c274125264aef84a2847158eb3 Chainlink: LINK Token0 Ether
0xac6cc46fb493d5df1a6f9485d963351812e1d6a6be179502bf3f6bed76a944b186567552022-05-20 9:49:051 hr 4 mins ago 0x94bc2a1c732bcad7343b25af48385fe76e08734f Chainlink: LINK Token0 Ether
0xac6cc46fb493d5df1a6f9485d963351812e1d6a6be179502bf3f6bed76a944b186567552022-05-20 9:49:051 hr 4 mins ago 0x8531e48a8611729185be9eaad945acbd6b32e256 Chainlink: LINK Token0 Ether
0x82e97a038181ed2a683998e01d8b6f0d6f86730e7cff82da4b2f1eae080b848586561692022-05-20 9:36:491 hr 17 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x82e97a038181ed2a683998e01d8b6f0d6f86730e7cff82da4b2f1eae080b848586561692022-05-20 9:36:491 hr 17 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0xf7646792162718f00367ade13703e6f0c8d1074143f35e5fd4b354d41bbcc21d86560972022-05-20 9:35:431 hr 18 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0xf7646792162718f00367ade13703e6f0c8d1074143f35e5fd4b354d41bbcc21d86560972022-05-20 9:35:431 hr 18 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x3a3741434f8330f509751355b0fc6289c613a24f0d9a3ca61b639f98a966a7c786560102022-05-20 9:34:101 hr 19 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x3a3741434f8330f509751355b0fc6289c613a24f0d9a3ca61b639f98a966a7c786560102022-05-20 9:34:101 hr 19 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0xd16557d2a2951ea4f1d7c8d42d1c99e3bf74bfe71eaf2dba29268288e02bf29886557852022-05-20 9:30:321 hr 23 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0xd16557d2a2951ea4f1d7c8d42d1c99e3bf74bfe71eaf2dba29268288e02bf29886557852022-05-20 9:30:321 hr 23 mins ago Clipper Exchange: Pool Chainlink: LINK Token0 Ether
0x9edc7c59f8baff4f084989e676473a236d9720342d5740dc0f2a8404387341a986556282022-05-20 9:26:191 hr 27 mins ago 0x19ea026886cbb7a900ecb2458636d72b5cae223b Chainlink: LINK Token0 Ether
0x9edc7c59f8baff4f084989e676473a236d9720342d5740dc0f2a8404387341a986556282022-05-20 9:26:191 hr 27 mins ago Uniswap V3: Router Chainlink: LINK Token0 Ether
0x9edc7c59f8baff4f084989e676473a236d9720342d5740dc0f2a8404387341a986556282022-05-20 9:26:191 hr 27 mins ago 0x19ea026886cbb7a900ecb2458636d72b5cae223b Chainlink: LINK Token0 Ether
0x9edc7c59f8baff4f084989e676473a236d9720342d5740dc0f2a8404387341a986556282022-05-20 9:26:191 hr 27 mins ago 0xe74fa58448aedd329ddf07404b9babf76a31b978 Chainlink: LINK Token0 Ether
0x9edc7c59f8baff4f084989e676473a236d9720342d5740dc0f2a8404387341a986556282022-05-20 9:26:191 hr 27 mins ago 0xe74fa58448aedd329ddf07404b9babf76a31b978 Chainlink: LINK Token0 Ether
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Contract Source Code Verified (Genesis Bytecode Match Only)

Contract Name:
LinkTokenOptimism

Compiler Version
v0.7.6-allow_kall

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at optimistic.etherscan.io on 2021-07-19
*/

// Sources flattened with hardhat v2.4.3 https://hardhat.org

// File vendor/OpenZeppelin/openzeppelin-contracts/contracts/introspection/IERC165.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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/v0.6/ITypeAndVersion.sol


pragma solidity >0.6.0;

/// @dev Interface contracts should use to report its type and version.
interface ITypeAndVersion {
  /**
   * @dev Returns type and version for the contract.
   *
   * The returned string has the following format: <contract name><SPACE><semver>
   * Try to keep its length less than 32 to take up less contract space.
   */
  function typeAndVersion()
    external
    pure
    returns (string memory);
}


// File vendor/OpenZeppelin/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol



pragma solidity >=0.6.0 <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 contracts/v0.7/bridge/token/optimism/IERC20Optimism.sol


pragma solidity >0.6.0 <0.8.0;

/* Interface Imports */


/// @dev Interface for the bridged ERC20 token expected by the Optimism standard bridge L2 gateway.
interface IERC20Optimism is IERC20, IERC165 {
  /// @dev Returns the address of an L1 token contract linked to this L2 token contract
  function l1Token()
    external
    returns (address);

  /**
   * @dev Creates `_amount` tokens `_to` account.
   * @notice Called by L2 gateway to deposit tokens.
   * @param _to Address of the recipient.
   * @param _amount Number of tokens to mint.
   */
  function mint(
    address _to,
    uint256 _amount
  )
    external;

  /**
   * @dev Destroys `_amount` tokens `_from` account.
   * @notice Called by L2 gateway to withdraw tokens.
   * @param _from Address of the account holding the tokens to be burnt.
   * @param _amount Number of tokens to burn.
   */
  function burn(
    address _from,
    uint256 _amount
  )
    external;

  /// @dev Emitted when `_amount` tokens are deposited from L1 to L2.
  event Mint(
    address indexed _account,
    uint256 _amount
  );

  /// @dev Emitted when `_amount` tokens are withdrawn from L2 to L1.
  event Burn(
    address indexed _account,
    uint256 _amount
  );
}


// File vendor/OpenZeppelin/openzeppelin-contracts/contracts/utils/Context.sol



pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


// File vendor/OpenZeppelin/openzeppelin-contracts/contracts/math/SafeMath.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}


// File vendor/OpenZeppelin/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol



pragma solidity >=0.6.0 <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 guidelines: functions revert instead
 * of 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 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 {_setupDecimals} is
     * called.
     *
     * 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 returns (uint8) {
        return _decimals;
    }

    /**
     * @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);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(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:
     *
     * - `to` 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 = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(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);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @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 to 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 { }
}


// File contracts/v0.6/token/LinkERC20.sol


pragma solidity >0.6.0 <0.8.0;

abstract contract LinkERC20 is ERC20 {
  /**
   * @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 increaseApproval(
    address spender,
    uint256 addedValue
  )
    public
    virtual
    returns (bool)
  {
    return super.increaseAllowance(spender, addedValue);
  }

  /**
   * @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 decreaseApproval(
    address spender,
    uint256 subtractedValue
  )
    public
    virtual
    returns (bool)
  {
    return super.decreaseAllowance(spender, subtractedValue);
  }
}


// File contracts/v0.6/token/IERC677.sol


pragma solidity >0.6.0 <0.8.0;

interface IERC677 is IERC20 {
  function transferAndCall(
    address to,
    uint value,
    bytes memory data
  )
    external
    returns (bool success);

  event Transfer(
    address indexed from,
    address indexed to,
    uint value,
    bytes data
  );
}


// File contracts/v0.6/token/IERC677Receiver.sol


pragma solidity >0.6.0 <0.8.0;

interface IERC677Receiver {
  function onTokenTransfer(
    address sender,
    uint value,
    bytes memory data
  )
    external;
}


// File contracts/v0.6/ERC677.sol


pragma solidity >0.6.0 <0.8.0;



abstract contract ERC677 is IERC677, ERC20 {
  /**
   * @dev transfer token to a contract address with additional data if the recipient is a contact.
   * @param to The address to transfer to.
   * @param value The amount to be transferred.
   * @param data The extra data to be passed to the receiving contract.
   */
  function transferAndCall(
    address to,
    uint value,
    bytes memory data
  )
    public
    override
    virtual
    returns (bool success)
  {
    super.transfer(to, value);
    emit Transfer(msg.sender, to, value, data);
    if (isContract(to)) {
      contractFallback(to, value, data);
    }
    return true;
  }


  // PRIVATE

  function contractFallback(
    address to,
    uint value,
    bytes memory data
  )
    private
  {
    IERC677Receiver receiver = IERC677Receiver(to);
    receiver.onTokenTransfer(msg.sender, value, data);
  }

  function isContract(
    address addr
  )
    private
    view
    returns (bool hasCode)
  {
    uint length;
    assembly { length := extcodesize(addr) }
    return length > 0;
  }
}


// File contracts/v0.6/LinkToken.sol


pragma solidity >0.6.0 <0.8.0;



/// @dev LinkToken, an ERC20/ERC677 Chainlink token with 1 billion supply
contract LinkToken is ITypeAndVersion, LinkERC20, ERC677 {
  uint private constant TOTAL_SUPPLY = 10**27;
  string private constant NAME = 'ChainLink Token';
  string private constant SYMBOL = 'LINK';

  constructor()
    ERC20(NAME, SYMBOL)
    public
  {
    _onCreate();
  }

  /**
   * @notice versions:
   *
   * - LinkToken 0.0.3: added versioning, update name
   * - LinkToken 0.0.2: upgraded to solc 0.6
   * - LinkToken 0.0.1: initial release solc 0.4
   *
   * @inheritdoc ITypeAndVersion
   */
  function typeAndVersion()
    external
    pure
    override
    virtual
    returns (string memory)
  {
    return "LinkToken 0.0.3";
  }

  /**
   * @dev Hook that is called when this contract is created.
   * Useful to override constructor behaviour in child contracts (e.g., LINK bridge tokens).
   * @notice Default implementation mints 10**27 tokens to msg.sender
   */
  function _onCreate()
    internal
    virtual
  {
    _mint(msg.sender, TOTAL_SUPPLY);
  }

  /**
   * @dev Check if recepient is a valid address before transfer
   * @inheritdoc ERC20
   */
  function _transfer(
    address sender,
    address recipient,
    uint256 amount
  )
    internal
    override
    virtual
    validAddress(recipient)
  {
    super._transfer(sender, recipient, amount);
  }

  /**
   * @dev Check if spender is a valid address before approval
   * @inheritdoc ERC20
   */
  function _approve(
    address owner,
    address spender,
    uint256 amount
  )
    internal
    override
    virtual
    validAddress(spender)
  {
    super._approve(owner, spender, amount);
  }

  /**
   * @dev Check if recipient is valid (not this contract address)
   * @param recipient the account we transfer/approve to
   */
  modifier validAddress(
    address recipient
  )
    virtual
  {
    require(recipient != address(this), "LinkToken: transfer/approve to this contract address");
    _;
  }
}


// File contracts/v0.7/bridge/token/optimism/LinkTokenOptimism.sol


pragma solidity >0.6.0 <0.8.0;

/* Interface Imports */



/* Contract Imports */


/// @dev Access controlled mintable & burnable LinkToken, for use on Optimism L2 network.
contract LinkTokenOptimism is ITypeAndVersion, IERC20Optimism, LinkToken {
  /// @dev Returns the address of an L2 bridge contract that has access to mint & burn
  address public immutable l2Bridge;
  /// @inheritdoc IERC20Optimism
  address public immutable override l1Token;

  /**
   * @dev Creates an L2 token connected to a specific L2 bridge gateway & L1 token
   * @param l2BridgeAddr Address of the corresponding L2 bridge gateway.
   * @param l1TokenAddr Address of the corresponding L1 token.
   */
  constructor(
    address l2BridgeAddr,
    address l1TokenAddr
  ) {
    l2Bridge = l2BridgeAddr;
    l1Token = l1TokenAddr;
  }

  /**
   * @notice versions:
   *
   * - LinkTokenOptimism 0.0.1: initial release
   *
   * @inheritdoc ITypeAndVersion
   */
  function typeAndVersion()
    external
    pure
    override(ITypeAndVersion, LinkToken)
    virtual
    returns (string memory)
  {
    return "LinkTokenOptimism 0.0.1";
  }

  /// @dev Checks that message sender is the L2 bridge contract (locked access to mint & burn)
  modifier onlyL2Bridge {
    require(msg.sender == l2Bridge, "Only L2 Bridge can mint and burn");
    _;
  }

  /**
   * @dev Optimism standard bridge L2 gateway uses ERC165 to confirm the required interface
   * @inheritdoc IERC165
   */
  function supportsInterface(
    bytes4 interfaceId
  )
    public
    override
    pure
    returns (bool)
  {
    bytes4 firstSupportedInterface = bytes4(keccak256("supportsInterface(bytes4)")); // ERC165
    bytes4 secondSupportedInterface = IERC20Optimism.l1Token.selector
      ^ IERC20Optimism.mint.selector
      ^ IERC20Optimism.burn.selector;
    return interfaceId == firstSupportedInterface || interfaceId == secondSupportedInterface;
  }

  /// @inheritdoc IERC20Optimism
  function mint(
    address _to,
    uint256 _amount
  )
    public
    override
    onlyL2Bridge()
  {
    _mint(_to, _amount);
    emit Mint(_to, _amount);
  }

  /// @inheritdoc IERC20Optimism
  function burn(
    address _from,
    uint256 _amount
  )
    public
    override
    onlyL2Bridge()
  {
    _burn(_from, _amount);
    emit Burn(_from, _amount);
  }

  /**
   * @dev Overrides parent contract so no tokens are minted on deployment.
   * @inheritdoc LinkToken
   */
  function _onCreate()
    internal
    override
  {}
}

Contract Security Audit

Contract ABI

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nternalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"transferAndCall","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"typeAndVersion","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"}]

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

0000000000000000000000004200000000000000000000000000000000000010000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca

-----Decoded View---------------
Arg [0] : l2BridgeAddr (address): 0x4200000000000000000000000000000000000010
Arg [1] : l1TokenAddr (address): 0x514910771af9ca656af840dff83e8264ecf986ca

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000004200000000000000000000000000000000000010
Arg [1] : 000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca


Deployed ByteCode Sourcemap

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