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interface IERC165    - function supportsInterface(bytes4 int ... interface ITypeAndVersion    - function typeAndVersion() interface IERC20    - function totalSupply()    - function balanceOf(address account)    - function transfer(address recipient, ...    - function allowance(address owner, add ...    - function approve(address spender, uin ...    - function transferFrom(address sender, ... interface IERC20Optimism is IERC20, I ...    - function l1Token()    - function mint(    - function burn(    - function _msgSender()    - function _msgData() library SafeMath    - function tryAdd(uint256 a, uint256 b)    - function trySub(uint256 a, uint256 b)    - function tryMul(uint256 a, uint256 b)    - function tryDiv(uint256 a, uint256 b)    - function tryMod(uint256 a, uint256 b)    - function add(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function mod(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b, st ...    - function div(uint256 a, uint256 b, st ...    - function mod(uint256 a, uint256 b, st ...  contract ERC20 is Context, IERC20    - function name()    - function symbol()    - function decimals()    - function totalSupply()    - function balanceOf(address account)    - function transfer(address recipient, ...    - function allowance(address owner, add ...    - function approve(address spender, uin ...    - function transferFrom(address sender, ...    - function increaseAllowance(address sp ...    - function decreaseAllowance(address sp ...    - function _transfer(address sender, ad ...    - function _mint(address account, uint2 ...    - function _burn(address account, uint2 ...    - function _approve(address owner, addr ...    - function _setupDecimals(uint8 decimal ...    - function _beforeTokenTransfer(address ...    - function increaseApproval(    - function decreaseApproval( interface IERC677 is IERC20    - function transferAndCall( interface IERC677Receiver    - function onTokenTransfer(    - function transferAndCall(    - function contractFallback(    - function isContract(  contract LinkToken is ITypeAndVers ...    - function typeAndVersion()    - function _onCreate()    - function _transfer(    - function _approve(  contract LinkTokenOptimism is ITyp ... *    - function typeAndVersion()    - function supportsInterface(    - function mint(    - function burn(    - function _onCreate()

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/**
 *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
  {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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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

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