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Outline

•    - function _msgSender()
•    - function _msgData()
• 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 add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b, st ...
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b, st ...
•    - function mod(uint256 a, uint256 b)
•    - 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 _functionCallWithValue(addre ...
•  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 ...
•  contract MultiPartyEscrow *
•    - function deposit(uint256 value)
•    - function withdraw(uint256 value)
•    - function transfer(address receiver, u ...
•    - function openChannel(address signer, ...
•    - function openChannelByThirdParty(addr ...
•    - function _openChannel(address sender, ...
•    - function depositAndOpenChannel(addres ...
•    - function _channelSendbackAndReopenSus ...
•    - function multiChannelClaim(uint256[] ...
•    - function channelClaim(uint256 channel ...
•    - function channelExtend(uint256 channe ...
•    - function channelAddFunds(uint256 chan ...
•    - function channelExtendAndAddFunds(uin ...
•    - function channelClaimTimeout(uint256 ...
•    - function prefixed(bytes32 hash)

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/**
 *Submitted for verification at Etherscan.io on 2022-02-11
*/

// File: node_modules\@openzeppelin\contracts\GSN\Context.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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: node_modules\@openzeppelin\contracts\token\ERC20\IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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: node_modules\@openzeppelin\contracts\math\SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: node_modules\@openzeppelin\contracts\utils\Address.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @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 in 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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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\ERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;





/**
 * @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;
    using Address for address;

    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 returns (string memory) {
        return _name;
    }

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

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 {
        _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\MultiPartyEscrow.sol

pragma solidity ^0.6.0;



contract MultiPartyEscrow {
    
    using SafeMath for uint256;
    
    //TODO: we could use uint64 for value, nonce and expiration (it could be cheaper to store but more expensive to operate with)
    //the full ID of "atomic" payment channel = "[this, channelId, nonce]"
    struct PaymentChannel {
        uint256 nonce;       // "nonce" of the channel (by changing nonce we effectivly close the old channel ([this, channelId, oldNonce])
                             //  and open the new channel [this, channelId, newNonce])
                             //!!! nonce also prevents race conditon between channelClaim and channelExtendAndAddFunds
        address sender;      // The account sending payments.
        address signer;      // signer on behalf of sender
        address recipient;   // The account receiving the payments.
        bytes32 groupId;     // id of group of replicas who share the same payment channel
                             // You should generate groupId randomly in order to prevent
                             // two PaymentChannel with the same [recipient, groupId]
        uint256 value;       // Total amount of tokens deposited to the channel. 
        uint256 expiration;  // Timeout (in block numbers) in case the recipient never closes.
                             // if block.number > expiration then sender can call channelClaimTimeout
    }


    mapping (uint256 => PaymentChannel) public channels;
    mapping (address => uint256)        public balances; //tokens which have been deposit but haven't been escrowed in the channels
   
    uint256 public nextChannelId; //id of the next channel (and size of channels)
 
    ERC20 public token; // Address of token contract
    
    //already used messages for openChannelByThirdParty in order to prevent replay attack
    mapping (bytes32 => bool) public usedMessages; 

    // Events
    event ChannelOpen(uint256 channelId, uint256 nonce, address indexed sender, address signer, address indexed recipient, bytes32 indexed groupId, uint256 amount, uint256 expiration);
    event ChannelClaim(uint256 indexed channelId, uint256 nonce, address indexed recipient, uint256 claimAmount, uint256 plannedAmount, uint256 sendBackAmount, uint256 keepAmount);
    event ChannelSenderClaim(uint256 indexed channelId, uint256 nonce, uint256 claimAmount);
    event ChannelExtend(uint256 indexed channelId, uint256 newExpiration);
    event ChannelAddFunds(uint256 indexed channelId, uint256 additionalFunds);
    event DepositFunds(address indexed sender, uint256 amount);
    event WithdrawFunds(address indexed sender, uint256 amount);
    event TransferFunds(address indexed sender, address indexed receiver, uint256 amount);

    constructor (address _token)
    public
    {
        token = ERC20(_token);
    }
  
    function deposit(uint256 value) 
    public
    returns(bool) 
    {
        require(token.transferFrom(msg.sender, address(this), value), "Unable to transfer token to the contract."); 
        balances[msg.sender] = balances[msg.sender].add(value);
        emit DepositFunds(msg.sender, value);
        return true;
    }
    
    function withdraw(uint256 value)
    public
    returns(bool)
    {
        require(balances[msg.sender] >= value, "Insufficient balance in the contract.");
        require(token.transfer(msg.sender, value), "Unable to transfer token to the contract.");
        balances[msg.sender] = balances[msg.sender].sub(value);
        emit WithdrawFunds(msg.sender, value);
        return true;
    }
    
    function transfer(address receiver, uint256 value)
    public
    returns(bool)
    {
        require(balances[msg.sender] >= value, "Insufficient balance in the contract");
        balances[msg.sender] = balances[msg.sender].sub(value);
        balances[receiver] = balances[receiver].add(value);

        emit TransferFunds(msg.sender, receiver, value);
        return true;
    }
    
    
    //open a channel, token should be already being deposit
    //openChannel should be run only once for given sender, recipient, groupId
    //channel can be reused even after channelClaim(..., isSendback=true)
    function openChannel(address signer, address recipient, bytes32 groupId, uint256 value, uint256 expiration)
    public
    returns(bool)
    {
        require(balances[msg.sender] >= value, "Insufficient balance in the contract.");
        require(signer != address(0));

        require(_openChannel(msg.sender, signer, recipient, groupId, value, expiration), "Unable to open channel");
        return true;
    }
    
    //open a channel on behalf of the user. Sender should send the signed permission to open the channel
    function openChannelByThirdParty(address sender, address signer, address recipient, bytes32 groupId, uint256 value, uint256 expiration, uint256 messageNonce, uint8 v, bytes32 r, bytes32 s) 
    public
    returns(bool) 
    {
        require(balances[msg.sender] >= value, "Insufficient balance");

        // Blocks seems to take variable time based on network congestion for now removing it. Message nounce will be a blocknumber
        //require(messageNonce >= block.number-5 && messageNonce <= block.number+5, "Invalid message nonce");

        //compose the message which was signed
        bytes32 message = prefixed(keccak256(abi.encodePacked("__openChannelByThirdParty", this, msg.sender, signer, recipient, groupId, value, expiration, messageNonce)));
        
        //check for replay attack (message can be used only once)
        require( ! usedMessages[message], "Signature has already been used");
        usedMessages[message] = true;

        // check that the signature is from the "sender"
        require(ecrecover(message, v, r, s) == sender, "Invalid signature");

        require(_openChannel(sender, signer, recipient, groupId, value, expiration), "Unable to open channel");
        
        return true;
    }

    function _openChannel(address sender, address signer, address recipient, bytes32 groupId, uint256 value, uint256 expiration)
    private
    returns(bool)
    {
        channels[nextChannelId] = PaymentChannel({
            nonce        : 0,
            sender       : sender,
            signer       : signer,
            recipient    : recipient,
            groupId      : groupId,
            value        : value,
            expiration   : expiration
        });
      
        balances[msg.sender] = balances[msg.sender].sub(value);
        emit ChannelOpen(nextChannelId, 0, sender, signer, recipient, groupId, value, expiration);
        nextChannelId += 1;
        return true;
    }

    function depositAndOpenChannel(address signer, address recipient, bytes32 groupId, uint256 value, uint256 expiration)
    public
    returns(bool)
    {
        require(deposit(value), "Unable to deposit token to the contract.");
        require(openChannel(signer, recipient, groupId, value, expiration), "Unable to open channel.");
        return true;
    }


    function _channelSendbackAndReopenSuspended(uint256 channelId)
    private
    {
        PaymentChannel storage channel = channels[channelId];

        balances[channel.sender] = balances[channel.sender].add(channel.value); 
        channel.value            = 0;
        channel.nonce           += 1;
        channel.expiration       = 0;
    }

    /**
     * @dev function to claim multiple channels at a time. Needs to send limited channels per call
     * @param channelIds list of channel Ids
     * @param actualAmounts list of actual amounts should be aligned with channel ids index
     * @param plannedAmounts list of planned amounts should be aligned with channel ids index
     * @param isSendbacks list of sendbacks flags
     * @param v channel senders signatures in V R S for each channel
     * @param r channel senders signatures in V R S for each channel
     * @param s channel senders signatures in V R S for each channel
     */
    function multiChannelClaim(uint256[] memory channelIds, uint256[] memory actualAmounts, uint256[] memory plannedAmounts, bool[] memory isSendbacks, uint8[] memory v, bytes32[] memory r, bytes32[] memory s) 
    public 
    {
        uint256 len = channelIds.length;
        
        require(plannedAmounts.length == len && actualAmounts.length == len && isSendbacks.length == len && v.length == len && r.length == len && s.length == len, "Invalid function parameters.");
        for(uint256 i=0; i<len ; i++) {
            channelClaim(channelIds[i], actualAmounts[i], plannedAmounts[i], v[i], r[i], s[i], isSendbacks[i]);
        }
        
    }

    function channelClaim(uint256 channelId, uint256 actualAmount, uint256 plannedAmount, uint8 v, bytes32 r, bytes32 s, bool isSendback) 
    public 
    {
        PaymentChannel storage channel = channels[channelId];
        require(actualAmount <= channel.value, "Insufficient channel amount");
        require(msg.sender == channel.recipient, "Invalid recipient");
        require(actualAmount <= plannedAmount, "Invalid actual amount");
        
        //compose the message which was signed
        bytes32 message = prefixed(keccak256(abi.encodePacked("__MPE_claim_message", this, channelId, channel.nonce, plannedAmount)));
        // check that the signature is from the signer
        address signAddress = ecrecover(message, v, r, s);
        require(signAddress == channel.signer || signAddress == channel.sender, "Invalid signature");
        
        //transfer amount from the channel to the sender
        channel.value        =        channel.value.sub(actualAmount);
        balances[msg.sender] = balances[msg.sender].add(actualAmount);
   
        if (isSendback)    
            {
                _channelSendbackAndReopenSuspended(channelId);
                emit ChannelClaim(channelId, channel.nonce, msg.sender, actualAmount, plannedAmount, channel.value, 0);
            }
            else
            {
                //reopen new "channel", without sending back funds to "sender"        
                channel.nonce += 1;
                emit ChannelClaim(channelId, channel.nonce, msg.sender, actualAmount, plannedAmount, 0, channel.value);
            }
    }



    /// the sender can extend the expiration at any time
    function channelExtend(uint256 channelId, uint256 newExpiration) 
    public 
    returns(bool)
    {
        PaymentChannel storage channel = channels[channelId];

        require(msg.sender == channel.sender, "Sender not authorized");
        require(newExpiration >= channel.expiration, "Invalid expiration.");

        channels[channelId].expiration = newExpiration;
        
        emit ChannelExtend(channelId, newExpiration);
        return true;
    }
    
    /// the sender could add funds to the channel at any time
    /// any one can fund the channel irrespective of the sender
    function channelAddFunds(uint256 channelId, uint256 amount)
    public
    returns(bool)
    {
        require(balances[msg.sender] >= amount, "Insufficient balance in the contract");

        //tranfser amount from sender to the channel
        balances[msg.sender]      = balances[msg.sender].sub     (amount);
        channels[channelId].value = channels[channelId].value.add(amount);
        
        emit ChannelAddFunds(channelId, amount);
        return true;
    }

    function channelExtendAndAddFunds(uint256 channelId, uint256 newExpiration, uint256 amount)
    public
    {
        require(channelExtend(channelId, newExpiration), "Unable to extend the channel.");
        require(channelAddFunds(channelId, amount), "Unable to add funds to channel.");
    }
    
    // sender can claim refund if the timeout is reached 
    function channelClaimTimeout(uint256 channelId) 
    public 
    {
        require(msg.sender == channels[channelId].sender, "Sender not authorized.");
        require(block.number >= channels[channelId].expiration, "Claim called too early.");
        _channelSendbackAndReopenSuspended(channelId);
        
        emit ChannelSenderClaim(channelId, channels[channelId].nonce, channels[channelId].value);
    }


    /// builds a prefixed hash to mimic the behavior of ethSign.
    function prefixed(bytes32 hash) internal pure returns (bytes32) 
    {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }
    
    
}

• No Contract Security Audit Submitted- Submit Audit Here

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ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"usedMessages","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"withdraw","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000005b7533812759b45c2b44c19e320ba2cd2681b542

-----Decoded View---------------
Arg [0] : _token (address): 0x5B7533812759B45C2B44C19e320ba2cD2681b542

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000005b7533812759b45c2b44c19e320ba2cd2681b542

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