Contract

Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

• 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, ...
• 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 ...
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(address target, ...
•    - function functionCallWithValue(addres ...
•    - function functionCallWithValue(addres ...
•    - function functionStaticCall(address t ...
•    - function functionStaticCall(address t ...
•    - function functionDelegateCall(address ...
•    - function functionDelegateCall(address ...
•    - function _verifyCallResult(bool succe ...
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function safeIncreaseAllowance(IERC20 ...
•    - function safeDecreaseAllowance(IERC20 ...
•    - function _callOptionalReturn(IERC20 t ...
• interface IOwned
•    - function owner()
•    - function transferOwnership(address _n ...
•    - function acceptOwnership()
•  contract Owned is IOwned
•    - function _ownerOnly()
•    - function transferOwnership(address _n ...
•    - function acceptOwnership()
•  contract Utils
•    - function _greaterThanZero(uint256 _va ...
•    - function _validAddress(address _addre ...
•    - function _validPortion(uint32 _portio ...
•    - function _validExternalAddress(addres ...
•    - function _validFee(uint32 fee)
• interface ITokenHolder is IOwned
•    - function withdrawTokens(
•    - function withdrawTokensMultiple(
•  contract TokenHolder is ITokenHold ... *
•    - function withdrawTokens(
•    - function withdrawTokensMultiple(
•    - function safeTransfer(

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2021-04-04
*/

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT

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: @openzeppelin/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: @openzeppelin/contracts/utils/Address.sol



pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



pragma solidity >=0.6.0 <0.8.0;




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: solidity/contracts/utility/interfaces/IOwned.sol


pragma solidity 0.6.12;

/*
    Owned contract interface
*/
interface IOwned {
    // this function isn't since the compiler emits automatically generated getter functions as external
    function owner() external view returns (address);

    function transferOwnership(address _newOwner) external;

    function acceptOwnership() external;
}

// File: solidity/contracts/utility/Owned.sol


pragma solidity 0.6.12;


/**
 * @dev This contract provides support and utilities for contract ownership.
 */
contract Owned is IOwned {
    address public override owner;
    address public newOwner;

    /**
     * @dev triggered when the owner is updated
     *
     * @param _prevOwner previous owner
     * @param _newOwner  new owner
     */
    event OwnerUpdate(address indexed _prevOwner, address indexed _newOwner);

    /**
     * @dev initializes a new Owned instance
     */
    constructor() public {
        owner = msg.sender;
    }

    // allows execution by the owner only
    modifier ownerOnly {
        _ownerOnly();
        _;
    }

    // error message binary size optimization
    function _ownerOnly() internal view {
        require(msg.sender == owner, "ERR_ACCESS_DENIED");
    }

    /**
     * @dev allows transferring the contract ownership
     * the new owner still needs to accept the transfer
     * can only be called by the contract owner
     *
     * @param _newOwner    new contract owner
     */
    function transferOwnership(address _newOwner) public override ownerOnly {
        require(_newOwner != owner, "ERR_SAME_OWNER");
        newOwner = _newOwner;
    }

    /**
     * @dev used by a new owner to accept an ownership transfer
     */
    function acceptOwnership() public override {
        require(msg.sender == newOwner, "ERR_ACCESS_DENIED");
        emit OwnerUpdate(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}

// File: solidity/contracts/utility/Utils.sol


pragma solidity 0.6.12;


/**
 * @dev Utilities & Common Modifiers
 */
contract Utils {
    uint32 internal constant PPM_RESOLUTION = 1000000;
    IERC20 internal constant NATIVE_TOKEN_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);

    // verifies that a value is greater than zero
    modifier greaterThanZero(uint256 _value) {
        _greaterThanZero(_value);
        _;
    }

    // error message binary size optimization
    function _greaterThanZero(uint256 _value) internal pure {
        require(_value > 0, "ERR_ZERO_VALUE");
    }

    // validates an address - currently only checks that it isn't null
    modifier validAddress(address _address) {
        _validAddress(_address);
        _;
    }

    // error message binary size optimization
    function _validAddress(address _address) internal pure {
        require(_address != address(0), "ERR_INVALID_ADDRESS");
    }

    // ensures that the portion is valid
    modifier validPortion(uint32 _portion) {
        _validPortion(_portion);
        _;
    }

    // error message binary size optimization
    function _validPortion(uint32 _portion) internal pure {
        require(_portion > 0 && _portion <= PPM_RESOLUTION, "ERR_INVALID_PORTION");
    }

    // validates an external address - currently only checks that it isn't null or this
    modifier validExternalAddress(address _address) {
        _validExternalAddress(_address);
        _;
    }

    // error message binary size optimization
    function _validExternalAddress(address _address) internal view {
        require(_address != address(0) && _address != address(this), "ERR_INVALID_EXTERNAL_ADDRESS");
    }

    // ensures that the fee is valid
    modifier validFee(uint32 fee) {
        _validFee(fee);
        _;
    }

    // error message binary size optimization
    function _validFee(uint32 fee) internal pure {
        require(fee <= PPM_RESOLUTION, "ERR_INVALID_FEE");
    }
}

// File: solidity/contracts/utility/interfaces/ITokenHolder.sol


pragma solidity 0.6.12;



/*
    Token Holder interface
*/
interface ITokenHolder is IOwned {
    receive() external payable;

    function withdrawTokens(
        IERC20 token,
        address payable to,
        uint256 amount
    ) external;

    function withdrawTokensMultiple(
        IERC20[] calldata tokens,
        address payable to,
        uint256[] calldata amounts
    ) external;
}

// File: solidity/contracts/utility/TokenHolder.sol


pragma solidity 0.6.12;





/**
 * @dev This contract provides a safety mechanism for allowing the owner to
 * send tokens that were sent to the contract by mistake back to the sender.
 *
 * We consider every contract to be a 'token holder' since it's currently not possible
 * for a contract to deny receiving tokens.
 */
contract TokenHolder is ITokenHolder, Owned, Utils {
    using SafeERC20 for IERC20;

    // prettier-ignore
    receive() external payable override virtual {}

    /**
     * @dev withdraws funds held by the contract and sends them to an account
     * can only be called by the owner
     *
     * @param token ERC20 token contract address (with a special handling of NATIVE_TOKEN_ADDRESS)
     * @param to account to receive the new amount
     * @param amount amount to withdraw
     */
    function withdrawTokens(
        IERC20 token,
        address payable to,
        uint256 amount
    ) public virtual override ownerOnly validAddress(to) {
        safeTransfer(token, to, amount);
    }

    /**
     * @dev withdraws multiple funds held by the contract and sends them to an account
     * can only be called by the owner
     *
     * @param tokens ERC20 token contract addresses (with a special handling of NATIVE_TOKEN_ADDRESS)
     * @param to account to receive the new amount
     * @param amounts amounts to withdraw
     */
    function withdrawTokensMultiple(
        IERC20[] calldata tokens,
        address payable to,
        uint256[] calldata amounts
    ) public virtual override ownerOnly validAddress(to) {
        uint256 length = tokens.length;
        require(length == amounts.length, "ERR_INVALID_LENGTH");

        for (uint256 i = 0; i < length; ++i) {
            safeTransfer(tokens[i], to, amounts[i]);
        }
    }

    /**
     * @dev transfers funds held by the contract and sends them to an account
     *
     * @param token ERC20 token contract address
     * @param to account to receive the new amount
     * @param amount amount to withdraw
     */
    function safeTransfer(
        IERC20 token,
        address payable to,
        uint256 amount
    ) internal {
        if (amount == 0) {
            return;
        }

        if (token == NATIVE_TOKEN_ADDRESS) {
            to.transfer(amount);
        } else {
            token.safeTransfer(to, amount);
        }
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_prevOwner","type":"address"},{"indexed":true,"internalType":"address","name":"_newOwner","type":"address"}],"name":"OwnerUpdate","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"newOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address payable","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"address payable","name":"to","type":"address"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"withdrawTokensMultiple","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

608060405234801561001057600080fd5b50600080546001600160a01b0319163317905561090b806100326000396000f3fe6080604052600436106100595760003560e01c806308506df7146100655780635e35359e1461014357806379ba5097146101865780638da5cb5b1461019b578063d4ee1d90146101cc578063f2fde38b146101e157610060565b3661006057005b600080fd5b34801561007157600080fd5b506101416004803603606081101561008857600080fd5b8101906020810181356401000000008111156100a357600080fd5b8201836020820111156100b557600080fd5b803590602001918460208302840111640100000000831117156100d757600080fd5b919390926001600160a01b038335169260408101906020013564010000000081111561010257600080fd5b82018360208201111561011457600080fd5b8035906020019184602083028401116401000000008311171561013657600080fd5b509092509050610214565b005b34801561014f57600080fd5b506101416004803603606081101561016657600080fd5b506001600160a01b038135811691602081013590911690604001356102c5565b34801561019257600080fd5b506101416102e8565b3480156101a757600080fd5b506101b061039f565b604080516001600160a01b039092168252519081900360200190f35b3480156101d857600080fd5b506101b06103ae565b3480156101ed57600080fd5b506101416004803603602081101561020457600080fd5b50356001600160a01b03166103bd565b61021c61043b565b8261022681610490565b84828114610270576040805162461bcd60e51b815260206004820152601260248201527108aa4a4be929cac82989288be988a9c8ea8960731b604482015290519081900360640190fd5b60005b818110156102bb576102b388888381811061028a57fe5b905060200201356001600160a01b0316878787858181106102a757fe5b905060200201356104e4565b600101610273565b5050505050505050565b6102cd61043b565b816102d781610490565b6102e28484846104e4565b50505050565b6001546001600160a01b0316331461033b576040805162461bcd60e51b815260206004820152601160248201527011549497d050d0d154d4d7d11153925151607a1b604482015290519081900360640190fd5b600154600080546040516001600160a01b0393841693909116917f343765429aea5a34b3ff6a3785a98a5abb2597aca87bfbb58632c173d585373a91a360018054600080546001600160a01b03199081166001600160a01b03841617909155169055565b6000546001600160a01b031681565b6001546001600160a01b031681565b6103c561043b565b6000546001600160a01b0382811691161415610419576040805162461bcd60e51b815260206004820152600e60248201526d22a9292fa9a0a6a2afa7aba722a960911b604482015290519081900360640190fd5b600180546001600160a01b0319166001600160a01b0392909216919091179055565b6000546001600160a01b0316331461048e576040805162461bcd60e51b815260206004820152601160248201527011549497d050d0d154d4d7d11153925151607a1b604482015290519081900360640190fd5b565b6001600160a01b0381166104e1576040805162461bcd60e51b81526020600482015260136024820152724552525f494e56414c49445f4144445245535360681b604482015290519081900360640190fd5b50565b806104ee57610563565b6001600160a01b03831673eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee141561054f576040516001600160a01b0383169082156108fc029083906000818181858888f19350505050158015610549573d6000803e3d6000fd5b50610563565b6105636001600160a01b0384168383610568565b505050565b604080516001600160a01b038416602482015260448082018490528251808303909101815260649091019091526020810180516001600160e01b031663a9059cbb60e01b179052610563908490606061060a826040518060400160405280602081526020017f5361666545524332303a206c6f772d6c6576656c2063616c6c206661696c6564815250856001600160a01b03166106669092919063ffffffff16565b8051909150156105635780806020019051602081101561062957600080fd5b50516105635760405162461bcd60e51b815260040180806020018281038252602a8152602001806108ac602a913960400191505060405180910390fd5b6060610675848460008561067f565b90505b9392505050565b6060824710156106c05760405162461bcd60e51b81526004018080602001828103825260268152602001806108866026913960400191505060405180910390fd5b6106c9856107db565b61071a576040805162461bcd60e51b815260206004820152601d60248201527f416464726573733a2063616c6c20746f206e6f6e2d636f6e7472616374000000604482015290519081900360640190fd5b60006060866001600160a01b031685876040518082805190602001908083835b602083106107595780518252601f19909201916020918201910161073a565b6001836020036101000a03801982511681845116808217855250505050505090500191505060006040518083038185875af1925050503d80600081146107bb576040519150601f19603f3d011682016040523d82523d6000602084013e6107c0565b606091505b50915091506107d08282866107e1565b979650505050505050565b3b151590565b606083156107f0575081610678565b8251156108005782518084602001fd5b8160405162461bcd60e51b81526004018080602001828103825283818151815260200191508051906020019080838360005b8381101561084a578181015183820152602001610832565b50505050905090810190601f1680156108775780820380516001836020036101000a031916815260200191505b509250505060405180910390fdfe416464726573733a20696e73756666696369656e742062616c616e636520666f722063616c6c5361666545524332303a204552433230206f7065726174696f6e20646964206e6f742073756363656564a2646970667358221220d2d2bd1ece0797247ff01bd8a769124a65647a627f949a6aea7ae3f8a5075bb964736f6c634300060c0033

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