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•  contract Claimable
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function claimOwnership()
• 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 ...
•  contract Context
•    - function _msgSender()
•    - function _msgData()
•  contract Ownable is Context
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• library ECDSA
•    - function recover(bytes32 hash, bytes ...
•    - function toEthSignedMessageHash(bytes ...
• library String
•    - function fromUint(uint _i)
•    - function fromBytes32(bytes32 _value)
•    - function fromAddress(address _addr)
•    - function add4(string memory a, string ...
• 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, ...
•  contract ERC20 is Context, 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, ...
•    - 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 _burnFrom(address account, u ...
•  contract ERC20Detailed is IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•  contract ERC20Shifted is ERC20, ER ...
•    - function recoverTokens(address _token ...
•    - function burn(address _from, uint256 ...
•    - function mint(address _to, uint256 _a ...
•  contract zBTC is ERC20Shifted(& ...
•  contract zZEC is ERC20Shifted(& ...
•  contract zBCH is ERC20Shifted(& ...
•  contract Shifter is Claimable
•    - function recoverTokens(address _token ...
•    - function claimTokenOwnership()
•    - function transferTokenOwnership(Shift ...
•    - function updateMintAuthority(address ...
•    - function updateMinimumShiftOutAmount( ...
•    - function updateFeeRecipient(address _ ...
•    - function updateShiftInFee(uint16 _nex ...
•    - function updateShiftOutFee(uint16 _ne ...
•    - function shiftIn(bytes32 _pHash, uint ...
•    - function shiftOut(bytes memory _to, u ...
•    - function verifySignature(bytes32 _sig ...
•    - function hashForSignature(bytes32 _pH ...
•  contract BTCShifter is Shifter
•  contract ZECShifter is Shifter
•  contract BCHShifter is Shifter
• library Address
•    - function isContract(address account)
•    - function toPayable(address account)
•    - function sendValue(address payable re ...
• 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 to ...
•  contract DEXReserve is ERC20, ERC2 ...
•    - function recoverTokens(address _token ...
•    - function updateFee(uint256 _pendingFe ...
•    - function buy(address _to, address _fr ...
•    - function sell(address _to, address _f ...
•    - function calculateBuyRcvAmt(uint256 _ ...
•    - function calculateSellRcvAmt(uint256 ...
•    - function removeLiquidity(uint256 _liq ...
•    - function addLiquidity(
•    - function calculateBaseTokenValue(uint ...
•    - function calculateQuoteTokenValue(uin ...
•    - function expectedBaseTokenAmount(uint ...
•    - function calculateExpectedLiquidity(u ...
•    - function _removeFees(uint256 _amount)
•  contract BTC_DAI_Reserve is DEXRes ...
•  contract ZEC_DAI_Reserve is DEXRes ...
•  contract BCH_DAI_Reserve is DEXRes ...
•  contract DEX is Claimable
•    - function recoverTokens(address _token ...
•    - function registerReserve(address _erc ...
•    - function trade(address _to, address _ ...
•    - function calculateReceiveAmount(addre ...
• library LinkedList
•    - function insertBefore(List storage se ...
•    - function insertAfter(List storage sel ...
•    - function remove(List storage self, ad ...
•    - function prepend(List storage self, a ...
•    - function append(List storage self, ad ...
•    - function swap(List storage self, addr ...
•    - function isInList(List storage self, ...
•    - function begin(List storage self)
•    - function end(List storage self)
•    - function next(List storage self, addr ...
•    - function previous(List storage self, ...
• interface IShifter
•    - function shiftIn(bytes32 _pHash, uint ...
•    - function shiftOut(bytes calldata _to, ...
•    - function shiftInFee()
•    - function shiftOutFee()
•  contract ShifterRegistry is Claima ...
•    - function recoverTokens(address _token ...
•    - function setShifter(address _tokenAdd ...
•    - function updateShifter(address _token ...
•    - function removeShifter(string calldat ...
•    - function getShifters(address _start, ...
•    - function getShiftedTokens(address _st ...
•    - function getShifterByToken(address _t ...
•    - function getShifterBySymbol(string ca ...
•    - function getTokenBySymbol(string call ...
•  contract DEXAdapter *
•    - function recoverTokens(address _token ...
•    - function trade(
•    - function hashTradePayload(
•    - function hashLiquidityPayload(
•    - function addLiquidity(
•    - function removeLiquidity(address _tok ...
•    - function _doTrade(
•    - function _transferIn(
•    - function _bytesToAddress(bytes memory ...
•    - function calculateReceiveAmount(addre ...
•    - function removeFee(uint256 _amount, u ...

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/**
 *Submitted for verification at Etherscan.io on 2019-10-31
*/

/**

Deployed by Ren Project, https://renproject.io

Commit hash: 272d917
Repository: https://github.com/renproject/darknode-sol
Issues: https://github.com/renproject/darknode-sol/issues

Licenses
openzeppelin-solidity: (MIT) https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/LICENSE
darknode-sol: (GNU GPL V3) https://github.com/renproject/darknode-sol/blob/master/LICENSE

*/

pragma solidity ^0.5.12;

/**
 * @title Claimable
 * @dev Extension for the Ownable contract, where the ownership needs to be claimed.
 * This allows the new owner to accept the transfer.
 */
contract Claimable {
    address private _pendingOwner;
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @return the address of the owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Claimable: caller is not the owner");
        _;
    }

    /**
    * @dev Modifier throws if called by any account other than the pendingOwner.
    */
    modifier onlyPendingOwner() {
      require(msg.sender == _pendingOwner, "Claimable: caller is not the pending owner");
      _;
    }

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     * @notice Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
    * @dev Allows the current owner to set the pendingOwner address.
    * @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
      _pendingOwner = newOwner;
    }

    /**
    * @dev Allows the pendingOwner address to finalize the transfer.
    */
    function claimOwnership() public onlyPendingOwner {
      emit OwnershipTransferred(_owner, _pendingOwner);
      _owner = _pendingOwner;
      _pendingOwner = address(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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * NOTE: This call _does not revert_ if the signature is invalid, or
     * if the signer is otherwise unable to be retrieved. In those scenarios,
     * the zero address is returned.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Check the signature length
        if (signature.length != 65) {
            revert("signature's length is invalid");
        }

        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            revert("signature's s is in the wrong range");
        }

        if (v != 27 && v != 28) {
            revert("signature's v is in the wrong range");
        }

        // If the signature is valid (and not malleable), return the signer address
        return ecrecover(hash, v, r, s);
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * replicates the behavior of the
     * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
     * JSON-RPC method.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }
}

library String {

    /// @notice Convert a uint value to its decimal string representation
    // solium-disable-next-line security/no-assign-params
    function fromUint(uint _i) internal pure returns (string memory) {
        if (_i == 0) {
            return "0";
        }
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (_i != 0) {
            bstr[k--] = byte(uint8(48 + _i % 10));
            _i /= 10;
        }
        return string(bstr);
    }

    /// @notice Convert a bytes32 value to its hex string representation
    function fromBytes32(bytes32 _value) internal pure returns(string memory) {
        bytes32 value = bytes32(uint256(_value));
        bytes memory alphabet = "0123456789abcdef";

        bytes memory str = new bytes(32 * 2 + 2);
        str[0] = '0';
        str[1] = 'x';
        for (uint i = 0; i < 32; i++) {
            str[2+i*2] = alphabet[uint(uint8(value[i] >> 4))];
            str[3+i*2] = alphabet[uint(uint8(value[i] & 0x0f))];
        }
        return string(str);
    }

    /// @notice Convert an address to its hex string representation
    function fromAddress(address _addr) internal pure returns(string memory) {
        bytes32 value = bytes32(uint256(_addr));
        bytes memory alphabet = "0123456789abcdef";

        bytes memory str = new bytes(20 * 2 + 2);
        str[0] = '0';
        str[1] = 'x';
        for (uint i = 0; i < 20; i++) {
            str[2+i*2] = alphabet[uint(uint8(value[i + 12] >> 4))];
            str[3+i*2] = alphabet[uint(uint8(value[i + 12] & 0x0f))];
        }
        return string(str);
    }

    /// @notice Append four strings
    function add4(string memory a, string memory b, string memory c, string memory d) internal pure returns (string memory) {
        return string(abi.encodePacked(a, b, c, d));
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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);
}

/**
 * @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 {ERC20Mintable}.
 *
 * 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;

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 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 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 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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _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 {
        require(account != address(0), "ERC20: burn from the zero address");

        _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 is 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 {
        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 Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @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.
     *
     * 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;
    }
}

/// @notice ERC20Shifted represents a digital asset that has been bridged on to
/// the Ethereum ledger. It exposes mint and burn functions that can only be
/// called by it's associated Shifter.
contract ERC20Shifted is ERC20, ERC20Detailed, Claimable {

    /* solium-disable-next-line no-empty-blocks */
    constructor(string memory _name, string memory _symbol, uint8 _decimals) public ERC20Detailed(_name, _symbol, _decimals) {}

    /// @notice Allow the owner of the contract to recover funds accidentally
    /// sent to the contract. To withdraw ETH, the token should be set to `0x0`.
    function recoverTokens(address _token) external onlyOwner {
        if (_token == address(0x0)) {
            msg.sender.transfer(address(this).balance);
        } else {
            ERC20(_token).transfer(msg.sender, ERC20(_token).balanceOf(address(this)));
        }
    }

    function burn(address _from, uint256 _amount) public onlyOwner {
        _burn(_from, _amount);
    }

    function mint(address _to, uint256 _amount) public onlyOwner {
        _mint(_to, _amount);
    }
}

/// @dev The following are not necessary for deploying zBTC or zZEC contracts,
/// but are used to track deployments.

/* solium-disable-next-line no-empty-blocks */
contract zBTC is ERC20Shifted("Shifted BTC", "zBTC", 8) {}

/* solium-disable-next-line no-empty-blocks */
contract zZEC is ERC20Shifted("Shifted ZEC", "zZEC", 8) {}

/* solium-disable-next-line no-empty-blocks */
contract zBCH is ERC20Shifted("Shifted BCH", "zBCH", 8) {}

/// @notice Shifter handles verifying mint and burn requests. A mintAuthority
/// approves new assets to be minted by providing a digital signature. An owner
/// of an asset can request for it to be burnt.
contract Shifter is Claimable {
    using SafeMath for uint256;

    uint8 public version = 2;

    uint256 constant BIPS_DENOMINATOR = 10000;
    uint256 public minShiftAmount;

    /// @notice Each Shifter token is tied to a specific shifted token.
    ERC20Shifted public token;

    /// @notice The mintAuthority is an address that can sign mint requests.
    address public mintAuthority;

    /// @dev feeRecipient is assumed to be an address (or a contract) that can
    /// accept erc20 payments it cannot be 0x0.
    /// @notice When tokens are mint or burnt, a portion of the tokens are
    /// forwarded to a fee recipient.
    address public feeRecipient;

    /// @notice The shiftIn fee in bips.
    uint16 public shiftInFee;

    /// @notice The shiftOut fee in bips.
    uint16 public shiftOutFee;

    /// @notice Each nHash can only be seen once.
    mapping (bytes32=>bool) public status;

    // LogShiftIn and LogShiftOut contain a unique `shiftID` that identifies
    // the mint or burn event.
    uint256 public nextShiftID = 0;

    event LogShiftIn(
        address indexed _to,
        uint256 _amount,
        uint256 indexed _shiftID,
        bytes32 indexed _signedMessageHash
    );
    event LogShiftOut(
        bytes _to,
        uint256 _amount,
        uint256 indexed _shiftID,
        bytes indexed _indexedTo
    );

    /// @param _token The ERC20Shifted this Shifter is responsible for.
    /// @param _feeRecipient The recipient of burning and minting fees.
    /// @param _mintAuthority The address of the key that can sign mint
    ///        requests.
    /// @param _shiftInFee The amount subtracted each shiftIn request and
    ///        forwarded to the feeRecipient. In BIPS.
    /// @param _shiftOutFee The amount subtracted each shiftOut request and
    ///        forwarded to the feeRecipient. In BIPS.
    constructor(ERC20Shifted _token, address _feeRecipient, address _mintAuthority, uint16 _shiftInFee, uint16 _shiftOutFee, uint256 _minShiftOutAmount) public {
        minShiftAmount = _minShiftOutAmount;
        token = _token;
        mintAuthority = _mintAuthority;
        shiftInFee = _shiftInFee;
        shiftOutFee = _shiftOutFee;
        updateFeeRecipient(_feeRecipient);
    }

    /// @notice Allow the owner of the contract to recover funds accidentally
    /// sent to the contract. To withdraw ETH, the token should be set to `0x0`.
    function recoverTokens(address _token) external onlyOwner {
        if (_token == address(0x0)) {
            msg.sender.transfer(address(this).balance);
        } else {
            ERC20(_token).transfer(msg.sender, ERC20(_token).balanceOf(address(this)));
        }
    }

    // Public functions ////////////////////////////////////////////////////////

    /// @notice Claims ownership of the token passed in to the constructor.
    /// `transferStoreOwnership` must have previously been called.
    /// Anyone can call this function.
    function claimTokenOwnership() public {
        token.claimOwnership();
    }

    /// @notice Allow the owner to update the owner of the ERC20Shifted token.
    function transferTokenOwnership(Shifter _nextTokenOwner) public onlyOwner {
        token.transferOwnership(address(_nextTokenOwner));
        _nextTokenOwner.claimTokenOwnership();
    }

    /// @notice Allow the owner to update the fee recipient.
    ///
    /// @param _nextMintAuthority The address to start paying fees to.
    function updateMintAuthority(address _nextMintAuthority) public onlyOwner {
        mintAuthority = _nextMintAuthority;
    }

    /// @notice Allow the owner to update the minimum shiftOut amount.
    ///
    /// @param _minShiftOutAmount The new min shiftOut amount.
    function updateMinimumShiftOutAmount(uint256 _minShiftOutAmount) public onlyOwner {
        minShiftAmount = _minShiftOutAmount;
    }

    /// @notice Allow the owner to update the fee recipient.
    ///
    /// @param _nextFeeRecipient The address to start paying fees to.
    function updateFeeRecipient(address _nextFeeRecipient) public onlyOwner {
        // ShiftIn and ShiftOut will fail if the feeRecipient is 0x0
        require(_nextFeeRecipient != address(0x0), "Shifter: fee recipient cannot be 0x0");

        feeRecipient = _nextFeeRecipient;
    }

    /// @notice Allow the owner to update the shiftIn fee.
    ///
    /// @param _nextFee The new fee for minting and burning.
    function updateShiftInFee(uint16 _nextFee) public onlyOwner {
        shiftInFee = _nextFee;
    }

    /// @notice Allow the owner to update the shiftOut fee.
    ///
    /// @param _nextFee The new fee for minting and burning.
    function updateShiftOutFee(uint16 _nextFee) public onlyOwner {
        shiftOutFee = _nextFee;
    }

    /// @notice shiftIn mints tokens after taking a fee for the `_feeRecipient`.
    ///
    /// @param _pHash (payload hash) The hash of the payload associated with the
    ///        shift.
    /// @param _amount The amount of the token being shifted int, in its
    ///        smallest value. (e.g. satoshis for BTC)
    /// @param _nHash (nonce hash) The hash of the nonce, amount and pHash.
    /// @param _sig The signature of the hash of the following values:
    ///        (pHash, amount, msg.sender, nHash), signed by the mintAuthority.
    function shiftIn(bytes32 _pHash, uint256 _amount, bytes32 _nHash, bytes memory _sig) public returns (uint256) {
        // Verify signature
        bytes32 signedMessageHash = hashForSignature(_pHash, _amount, msg.sender, _nHash);
        require(status[signedMessageHash] == false, "Shifter: nonce hash already spent");
        if (!verifySignature(signedMessageHash, _sig)) {
            // Return a detailed string containing the hash and recovered
            // signer. This is a costly operation but is only run in the revert
            // branch.
            revert(
                String.add4(
                    "Shifter: invalid signature - hash: ",
                    String.fromBytes32(signedMessageHash),
                    ", signer: ",
                    String.fromAddress(ECDSA.recover(signedMessageHash, _sig))
                )
            );
        }
        status[signedMessageHash] = true;

        // Mint `amount - fee` for the recipient and mint `fee` for the minter
        uint256 absoluteFee = (_amount.mul(shiftInFee)).div(BIPS_DENOMINATOR);
        uint256 receivedAmount = _amount.sub(absoluteFee);
        token.mint(msg.sender, receivedAmount);
        token.mint(feeRecipient, absoluteFee);

        // Emit a log with a unique shift ID
        emit LogShiftIn(msg.sender, receivedAmount, nextShiftID, signedMessageHash);
        nextShiftID += 1;

        return receivedAmount;
    }

    /// @notice shiftOut burns tokens after taking a fee for the `_feeRecipient`.
    ///
    /// @param _to The address to receive the unshifted digital asset. The
    ///        format of this address should be of the destination chain.
    ///        For example, when shifting out to Bitcoin, _to should be a
    ///        Bitcoin address.
    /// @param _amount The amount of the token being shifted out, in its
    ///        smallest value. (e.g. satoshis for BTC)
    function shiftOut(bytes memory _to, uint256 _amount) public returns (uint256) {
        // The recipient must not be empty. Better validation is possible,
        // but would need to be customized for each destination ledger.
        require(_to.length != 0, "Shifter: to address is empty");
        require(_amount >= minShiftAmount, "Shifter: amount is less than the minimum shiftOut amount");

        // Burn full amount and mint fee
        uint256 absoluteFee = (_amount.mul(shiftOutFee)).div(BIPS_DENOMINATOR);
        token.burn(msg.sender, _amount);
        token.mint(feeRecipient, absoluteFee);

        // Emit a log with a unique shift ID
        uint256 receivedValue = _amount.sub(absoluteFee);
        emit LogShiftOut(_to, receivedValue, nextShiftID, _to);
        nextShiftID += 1;

        return receivedValue;
    }

    /// @notice verifySignature checks the the provided signature matches the provided
    /// parameters.
    function verifySignature(bytes32 _signedMessageHash, bytes memory _sig) public view returns (bool) {
        return mintAuthority == ECDSA.recover(_signedMessageHash, _sig);
    }

    /// @notice hashForSignature hashes the parameters so that they can be signed.
    function hashForSignature(bytes32 _pHash, uint256 _amount, address _to, bytes32 _nHash) public view returns (bytes32) {
        return keccak256(abi.encode(_pHash, _amount, address(token), _to, _nHash));
    }
}

/// @dev The following are not necessary for deploying BTCShifter or ZECShifter
/// contracts, but are used to track deployments.
contract BTCShifter is Shifter {
    constructor(ERC20Shifted _token, address _feeRecipient, address _mintAuthority, uint16 _shiftInFee, uint16 _shiftOutFee, uint256 _minShiftOutAmount)
        Shifter(_token, _feeRecipient, _mintAuthority, _shiftInFee, _shiftOutFee, _minShiftOutAmount) public {
        }
}

contract ZECShifter is Shifter {
    constructor(ERC20Shifted _token, address _feeRecipient, address _mintAuthority, uint16 _shiftInFee, uint16 _shiftOutFee, uint256 _minShiftOutAmount)
        Shifter(_token, _feeRecipient, _mintAuthority, _shiftInFee, _shiftOutFee, _minShiftOutAmount) public {
        }
}

contract BCHShifter is Shifter {
    constructor(ERC20Shifted _token, address _feeRecipient, address _mintAuthority, uint16 _shiftInFee, uint16 _shiftOutFee, uint256 _minShiftOutAmount)
        Shifter(_token, _feeRecipient, _mintAuthority, _shiftInFee, _shiftOutFee, _minShiftOutAmount) public {
        }
}

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing 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.
     */
    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.

        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

/**
 * @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 ERC20;` 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));
    }

    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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}

/// @title DEXReserve
/// @notice The DEX Reserve holds the liquidity for a single token pair for the
/// DEX. Anyone can add liquidity, receiving in return a token representing
/// a share in the funds held by the reserve.
contract DEXReserve is ERC20, ERC20Detailed, Ownable {
    using SafeMath for uint256;
    using SafeERC20 for ERC20;

    uint256 public feeInBIPS;
    uint256 public pendingFeeInBIPS;
    uint256 public feeChangeBlock;

    ERC20 public baseToken;
    ERC20 public token;
    event LogAddLiquidity(address _liquidityProvider, uint256 _tokenAmount, uint256 _baseTokenAmount);
    event LogDebug(uint256 _rcvAmount);
    event LogFeesChanged(uint256 _previousFeeInBIPS, uint256 _newFeeInBIPS);

    constructor (string memory _name, string memory _symbol, uint8 _decimals, ERC20 _baseToken, ERC20 _token, uint256 _feeInBIPS) public ERC20Detailed(_name, _symbol, _decimals) {
        baseToken = _baseToken;
        token = _token;
        feeInBIPS = _feeInBIPS;
        pendingFeeInBIPS = _feeInBIPS;
    }

    /// @notice Allow anyone to recover funds accidentally sent to the contract.
    function recoverTokens(address _token) external onlyOwner {
        require(ERC20(_token) != baseToken && ERC20(_token) != token, "not allowed to recover reserve tokens");
        ERC20(_token).transfer(msg.sender, ERC20(_token).balanceOf(address(this)));
    }

    /// @notice Allow the reserve manager too update the contract fees.
    /// There is a 10 block delay to reduce the chance of front-running trades.
    function updateFee(uint256 _pendingFeeInBIPS) external onlyOwner {
        if (_pendingFeeInBIPS == pendingFeeInBIPS) {
            require(block.number >= feeChangeBlock, "must wait 100 blocks before updating the fee");
            emit LogFeesChanged(feeInBIPS, pendingFeeInBIPS);
            feeInBIPS = pendingFeeInBIPS;
        } else {
            // @dev 500 was chosen as an arbitrary limit - the fee should be
            // well below that.
            require(_pendingFeeInBIPS < 500, "fee must not exceed hard-coded limit");
            feeChangeBlock = block.number + 100;
            pendingFeeInBIPS = _pendingFeeInBIPS;
        }
    }

    function buy(address _to, address _from, uint256 _baseTokenAmount) external returns (uint256)  {
        require(totalSupply() != 0, "reserve has no funds");
        uint256 rcvAmount = calculateBuyRcvAmt(_baseTokenAmount);
        baseToken.safeTransferFrom(_from, address(this), _baseTokenAmount);
        token.safeTransfer(_to, rcvAmount);
        return rcvAmount;
    }

    function sell(address _to, address _from, uint256 _tokenAmount) external returns (uint256) {
        require(totalSupply() != 0, "reserve has no funds");
        uint256 rcvAmount = calculateSellRcvAmt(_tokenAmount);
        token.safeTransferFrom(_from, address(this), _tokenAmount);
        baseToken.safeTransfer(_to, rcvAmount);
        return rcvAmount;
    }

    function calculateBuyRcvAmt(uint256 _sendAmt) public view returns (uint256) {
        uint256 baseReserve = baseToken.balanceOf(address(this));
        uint256 tokenReserve = token.balanceOf(address(this));
        uint256 finalQuoteTokenAmount = (baseReserve.mul(tokenReserve)).div(baseReserve.add(_sendAmt));
        uint256 rcvAmt = tokenReserve.sub(finalQuoteTokenAmount);
        return _removeFees(rcvAmt);
    }

    function calculateSellRcvAmt(uint256 _sendAmt) public view returns (uint256) {
        uint256 baseReserve = baseToken.balanceOf(address(this));
        uint256 tokenReserve = token.balanceOf(address(this));
        uint256 finalBaseTokenAmount = (baseReserve.mul(tokenReserve)).div(tokenReserve.add(_sendAmt));
        uint256 rcvAmt = baseReserve.sub(finalBaseTokenAmount);
        return _removeFees(rcvAmt);
    }

    function removeLiquidity(uint256 _liquidity) external returns (uint256, uint256) {
        require(balanceOf(msg.sender) >= _liquidity, "insufficient balance");
        uint256 baseTokenAmount = calculateBaseTokenValue(_liquidity);
        uint256 quoteTokenAmount = calculateQuoteTokenValue(_liquidity);
        _burn(msg.sender, _liquidity);
        baseToken.safeTransfer(msg.sender, baseTokenAmount);
        token.safeTransfer(msg.sender, quoteTokenAmount);
        return (baseTokenAmount, quoteTokenAmount);
    }

    function addLiquidity(
        address _liquidityProvider, uint256 _maxBaseToken, uint256 _tokenAmount, uint256 _deadline
        ) external returns (uint256) {
        require(block.number <= _deadline, "addLiquidity request expired");
        uint256 liquidity = calculateExpectedLiquidity(_tokenAmount); 
        if (totalSupply() > 0) {
            require(_tokenAmount > 0, "token amount is less than allowed min amount");
            uint256 baseAmount = expectedBaseTokenAmount(_tokenAmount);
            require(baseAmount <= _maxBaseToken, "calculated base amount exceeds the maximum amount set");
            baseToken.safeTransferFrom(_liquidityProvider, address(this), baseAmount);
            emit LogAddLiquidity(_liquidityProvider, _tokenAmount, baseAmount);
        } else {
            baseToken.safeTransferFrom(_liquidityProvider, address(this), _maxBaseToken);
            emit LogAddLiquidity(_liquidityProvider, _tokenAmount, _maxBaseToken);
        }
        token.safeTransferFrom(msg.sender, address(this), _tokenAmount);
        _mint(_liquidityProvider, liquidity);
        return liquidity;
    }

    function calculateBaseTokenValue(uint256 _liquidity) public view returns (uint256) {
        require(totalSupply() != 0, "division by zero");
        uint256 baseReserve = baseToken.balanceOf(address(this));
        return (_liquidity * baseReserve)/totalSupply();
    }

    function calculateQuoteTokenValue(uint256 _liquidity) public view returns (uint256) {
        require(totalSupply() != 0,  "division by zero");
        uint256 tokenReserve = token.balanceOf(address(this));
        return (_liquidity * tokenReserve)/totalSupply();
    }

    function expectedBaseTokenAmount(uint256 _quoteTokenAmount) public view returns (uint256) {
        uint256 baseReserve = baseToken.balanceOf(address(this));
        uint256 tokenReserve = token.balanceOf(address(this));
        return (_quoteTokenAmount * baseReserve)/tokenReserve;
    }

    function calculateExpectedLiquidity(uint256 _tokenAmount) public view returns (uint256) {
        if (totalSupply() == 0) {
            return _tokenAmount*2;
        }
        return ((totalSupply()*_tokenAmount)/token.balanceOf(address(this)));
    }

    function _removeFees(uint256 _amount) internal view returns (uint256) {
        return (_amount * (10000 - feeInBIPS))/10000;
    }
}

/* solhint-disable-next-line */ /* solium-disable-next-line */
contract BTC_DAI_Reserve is DEXReserve {
    constructor (ERC20 _baseToken, ERC20 _token, uint256 _feeInBIPS) public DEXReserve("Bitcoin Liquidity Token", "BTCLT", 8, _baseToken, _token, _feeInBIPS) {
    }
}

/* solhint-disable-next-line */ /* solium-disable-next-line */
contract ZEC_DAI_Reserve is DEXReserve {
    constructor (ERC20 _baseToken, ERC20 _token, uint256 _feeInBIPS) public DEXReserve("ZCash Liquidity Token", "ZECLT", 8, _baseToken, _token, _feeInBIPS) {
    }
}

/* solhint-disable-next-line */ /* solium-disable-next-line */
contract BCH_DAI_Reserve is DEXReserve {
    constructor (ERC20 _baseToken, ERC20 _token, uint256 _feeInBIPS) public DEXReserve("BitcoinCash Liquidity Token", "BCHLT", 8, _baseToken, _token, _feeInBIPS) {
    }
}

/// @title DEX
/// @notice The DEX contract stores the reserves for each token pair and
/// provides functions for interacting with them:
///   1) the view-function `calculateReceiveAmount` for calculating how much
///      the user will receive in exchange for their tokens
///   2) the function `trade` for executing a swap. If one of the tokens is the
///      base token, this will only talk to one reserve. If neither of the
///      tokens are, then the trade will settle across two reserves.
///
/// The DEX is ownable, allowing a DEX operator to register new reserves.
/// Once a reserve has been registered, it can't be updated.
contract DEX is Claimable {
    mapping (address=>DEXReserve) public reserves;
    address public baseToken;

    event LogTrade(address _src, address _dst, uint256 _sendAmount, uint256 _recvAmount);

    /// @param _baseToken The reserves must all have a common base token.
    constructor(address _baseToken) public {
        baseToken = _baseToken;
    }

    /// @notice Allow the owner to recover funds accidentally sent to the
    /// contract. To withdraw ETH, the token should be set to `0x0`.
    function recoverTokens(address _token) external onlyOwner {
        if (_token == address(0x0)) {
            msg.sender.transfer(address(this).balance);
        } else {
            ERC20(_token).transfer(msg.sender, ERC20(_token).balanceOf(address(this)));
        }
    }

    /// @notice The DEX operator is able to register new reserves.
    /// @param _erc20 The token that can be traded against the base token.
    /// @param _reserve The address of the reserve contract. It must follow the
    ///        DEXReserve interface.
    function registerReserve(address _erc20, DEXReserve _reserve) external onlyOwner {
        require(reserves[_erc20] == DEXReserve(0x0), "token reserve already registered");
        reserves[_erc20] = _reserve;
    }

    /// @notice The main trade function to execute swaps.
    /// @param _to The address at which the DST tokens should be sent to.
    /// @param _src The address of the token being spent.
    /// @param _dst The address of the token being received.
    /// @param _sendAmount The amount of the source token being traded.
    function trade(address _to, address _src, address _dst, uint256 _sendAmount) public returns (uint256) {
        uint256 recvAmount;
        if (_src == baseToken) {
            require(reserves[_dst] != DEXReserve(0x0), "unsupported token");
            recvAmount = reserves[_dst].buy(_to, msg.sender, _sendAmount);
        } else if (_dst == baseToken) {
            require(reserves[_src] != DEXReserve(0x0), "unsupported token");
            recvAmount = reserves[_src].sell(_to, msg.sender, _sendAmount);
        } else {
            require(reserves[_src] != DEXReserve(0x0) && reserves[_dst] != DEXReserve(0x0), "unsupported token");
            uint256 intermediteAmount = reserves[_src].sell(address(this), msg.sender, _sendAmount);
            ERC20(baseToken).approve(address(reserves[_dst]), intermediteAmount);
            recvAmount = reserves[_dst].buy(_to, address(this), intermediteAmount);
        }
        emit LogTrade(_src, _dst, _sendAmount, recvAmount);
        return recvAmount;
    }

    /// @notice A read-only function to estimate the amount of DST tokens the
    /// trader would receive for the send amount.
    /// @param _src The address of the token being spent.
    /// @param _dst The address of the token being received.
    /// @param _sendAmount The amount of the source token being traded.
    function calculateReceiveAmount(address _src, address _dst, uint256 _sendAmount) public view returns (uint256) {
        if (_src == baseToken) {
            return reserves[_dst].calculateBuyRcvAmt(_sendAmount);
        }
        if (_dst == baseToken) {
            return reserves[_src].calculateSellRcvAmt(_sendAmount);
        }
        return reserves[_dst].calculateBuyRcvAmt(reserves[_src].calculateSellRcvAmt(_sendAmount));
    }
}

/**
 * @notice LinkedList is a library for a circular double linked list.
 */
library LinkedList {

    /*
    * @notice A permanent NULL node (0x0) in the circular double linked list.
    * NULL.next is the head, and NULL.previous is the tail.
    */
    address public constant NULL = address(0);

    /**
    * @notice A node points to the node before it, and the node after it. If
    * node.previous = NULL, then the node is the head of the list. If
    * node.next = NULL, then the node is the tail of the list.
    */
    struct Node {
        bool inList;
        address previous;
        address next;
    }

    /**
    * @notice LinkedList uses a mapping from address to nodes. Each address
    * uniquely identifies a node, and in this way they are used like pointers.
    */
    struct List {
        mapping (address => Node) list;
    }

    /**
    * @notice Insert a new node before an existing node.
    *
    * @param self The list being used.
    * @param target The existing node in the list.
    * @param newNode The next node to insert before the target.
    */
    function insertBefore(List storage self, address target, address newNode) internal {
        require(!isInList(self, newNode), "LinkedList: already in list");
        require(isInList(self, target) || target == NULL, "LinkedList: not in list");

        // It is expected that this value is sometimes NULL.
        address prev = self.list[target].previous;

        self.list[newNode].next = target;
        self.list[newNode].previous = prev;
        self.list[target].previous = newNode;
        self.list[prev].next = newNode;

        self.list[newNode].inList = true;
    }

    /**
    * @notice Insert a new node after an existing node.
    *
    * @param self The list being used.
    * @param target The existing node in the list.
    * @param newNode The next node to insert after the target.
    */
    function insertAfter(List storage self, address target, address newNode) internal {
        require(!isInList(self, newNode), "LinkedList: already in list");
        require(isInList(self, target) || target == NULL, "LinkedList: not in list");

        // It is expected that this value is sometimes NULL.
        address n = self.list[target].next;

        self.list[newNode].previous = target;
        self.list[newNode].next = n;
        self.list[target].next = newNode;
        self.list[n].previous = newNode;

        self.list[newNode].inList = true;
    }

    /**
    * @notice Remove a node from the list, and fix the previous and next
    * pointers that are pointing to the removed node. Removing anode that is not
    * in the list will do nothing.
    *
    * @param self The list being using.
    * @param node The node in the list to be removed.
    */
    function remove(List storage self, address node) internal {
        require(isInList(self, node), "LinkedList: not in list");
        if (node == NULL) {
            return;
        }
        address p = self.list[node].previous;
        address n = self.list[node].next;

        self.list[p].next = n;
        self.list[n].previous = p;

        // Deleting the node should set this value to false, but we set it here for
        // explicitness.
        self.list[node].inList = false;
        delete self.list[node];
    }

    /**
    * @notice Insert a node at the beginning of the list.
    *
    * @param self The list being used.
    * @param node The node to insert at the beginning of the list.
    */
    function prepend(List storage self, address node) internal {
        // isInList(node) is checked in insertBefore

        insertBefore(self, begin(self), node);
    }

    /**
    * @notice Insert a node at the end of the list.
    *
    * @param self The list being used.
    * @param node The node to insert at the end of the list.
    */
    function append(List storage self, address node) internal {
        // isInList(node) is checked in insertBefore

        insertAfter(self, end(self), node);
    }

    function swap(List storage self, address left, address right) internal {
        // isInList(left) and isInList(right) are checked in remove

        address previousRight = self.list[right].previous;
        remove(self, right);
        insertAfter(self, left, right);
        remove(self, left);
        insertAfter(self, previousRight, left);
    }

    function isInList(List storage self, address node) internal view returns (bool) {
        return self.list[node].inList;
    }

    /**
    * @notice Get the node at the beginning of a double linked list.
    *
    * @param self The list being used.
    *
    * @return A address identifying the node at the beginning of the double
    * linked list.
    */
    function begin(List storage self) internal view returns (address) {
        return self.list[NULL].next;
    }

    /**
    * @notice Get the node at the end of a double linked list.
    *
    * @param self The list being used.
    *
    * @return A address identifying the node at the end of the double linked
    * list.
    */
    function end(List storage self) internal view returns (address) {
        return self.list[NULL].previous;
    }

    function next(List storage self, address node) internal view returns (address) {
        require(isInList(self, node), "LinkedList: not in list");
        return self.list[node].next;
    }

    function previous(List storage self, address node) internal view returns (address) {
        require(isInList(self, node), "LinkedList: not in list");
        return self.list[node].previous;
    }

}

interface IShifter {
    function shiftIn(bytes32 _pHash, uint256 _amount, bytes32 _nHash, bytes calldata _sig) external returns (uint256);
    function shiftOut(bytes calldata _to, uint256 _amount) external returns (uint256);
    function shiftInFee() external view returns (uint256);
    function shiftOutFee() external view returns (uint256);
}

/// @notice ShifterRegistry is a mapping from assets to their associated
/// ERC20Shifted and Shifter contracts.
contract ShifterRegistry is Claimable {

    /// @dev The symbol is included twice because strings have to be hashed
    /// first in order to be used as a log index/topic.
    event LogShifterRegistered(string _symbol, string indexed _indexedSymbol, address indexed _tokenAddress, address indexed _shifterAddress);
    event LogShifterDeregistered(string _symbol, string indexed _indexedSymbol, address indexed _tokenAddress, address indexed _shifterAddress);
    event LogShifterUpdated(address indexed _tokenAddress, address indexed _currentShifterAddress, address indexed _newShifterAddress);

    /// @notice The number of shifters registered
    uint256 numShifters = 0;

    /// @notice A list of shifter contracts
    LinkedList.List private shifterList;

    /// @notice A list of shifted token contracts
    LinkedList.List private shiftedTokenList;

    /// @notice A map of token addresses to canonical shifter addresses
    mapping (address=>address) private shifterByToken;

    /// @notice A map of token symbols to canonical shifter addresses
    mapping (string=>address) private tokenBySymbol;

    /// @notice Allow the owner of the contract to recover funds accidentally
    /// sent to the contract. To withdraw ETH, the token should be set to `0x0`.
    function recoverTokens(address _token) external onlyOwner {
        if (_token == address(0x0)) {
            msg.sender.transfer(address(this).balance);
        } else {
            ERC20(_token).transfer(msg.sender, ERC20(_token).balanceOf(address(this)));
        }
    }

    /// @notice Allow the owner to set the shifter address for a given
    ///         ERC20Shifted token contract.
    ///
    /// @param _tokenAddress The address of the ERC20Shifted token contract.
    /// @param _shifterAddress The address of the Shifter contract.
    function setShifter(address _tokenAddress, address _shifterAddress) external onlyOwner {
        // Check that token, shifter and symbol haven't already been registered
        require(!LinkedList.isInList(shifterList, _shifterAddress), "ShifterRegistry: shifter already registered");
        require(shifterByToken[_tokenAddress] == address(0x0), "ShifterRegistry: token already registered");
        string memory symbol = ERC20Shifted(_tokenAddress).symbol();
        require(tokenBySymbol[symbol] == address(0x0), "ShifterRegistry: symbol already registered");

        // Add to list of shifters
        LinkedList.append(shifterList, _shifterAddress);

        // Add to list of shifted tokens
        LinkedList.append(shiftedTokenList, _tokenAddress);

        tokenBySymbol[symbol] = _tokenAddress;
        shifterByToken[_tokenAddress] = _shifterAddress;
        numShifters += 1;

        emit LogShifterRegistered(symbol, symbol, _tokenAddress, _shifterAddress);
    }

    /// @notice Allow the owner to update the shifter address for a given
    ///         ERC20Shifted token contract.
    ///
    /// @param _tokenAddress The address of the ERC20Shifted token contract.
    /// @param _newShifterAddress The updated address of the Shifter contract.
    function updateShifter(address _tokenAddress, address _newShifterAddress) external onlyOwner {
        // Check that token, shifter are registered
        address currentShifter = shifterByToken[_tokenAddress];
        require(shifterByToken[_tokenAddress] != address(0x0), "ShifterRegistry: token not registered");

        // Remove to list of shifters
        LinkedList.remove(shifterList, currentShifter);

        // Add to list of shifted tokens
        LinkedList.append(shifterList, _newShifterAddress);

        shifterByToken[_tokenAddress] = _newShifterAddress;

        emit LogShifterUpdated(_tokenAddress, currentShifter, _newShifterAddress);
    }

    /// @notice Allows the owner to remove the shifter address for a given
    ///         ERC20shifter token contract.
    ///
    /// @param _symbol The symbol of the token to deregister.
    function removeShifter(string calldata _symbol) external onlyOwner {
        // Look up token address
        address tokenAddress = tokenBySymbol[_symbol];
        require(tokenAddress != address(0x0), "ShifterRegistry: symbol not registered");

        // Look up shifter address
        address shifterAddress = shifterByToken[tokenAddress];

        // Remove token and shifter
        shifterByToken[tokenAddress] = address(0x0);
        tokenBySymbol[_symbol] = address(0x0);
        LinkedList.remove(shifterList, shifterAddress);
        LinkedList.remove(shiftedTokenList, tokenAddress);
        numShifters -= 1;

        emit LogShifterDeregistered(_symbol, _symbol, tokenAddress, shifterAddress);
    }

    /// @dev To get all the registered shifters use count = 0.
    function getShifters(address _start, uint256 _count) external view returns (address[] memory) {
        uint256 count;
        if (_count == 0) {
            count = numShifters;
        } else {
            count = _count;
        }

        address[] memory shifters = new address[](count);

        // Begin with the first node in the list
        uint256 n = 0;
        address next = _start;
        if (next == address(0)) {
            next = LinkedList.begin(shifterList);
        }

        while (n < count) {
            if (next == address(0)) {
                break;
            }
            shifters[n] = next;
            next = LinkedList.next(shifterList, next);
            n += 1;
        }
        return shifters;
    }

    /// @dev To get all the registered shifted tokens use count = 0.
    function getShiftedTokens(address _start, uint256 _count) external view returns (address[] memory) {
        uint256 count;
        if (_count == 0) {
            count = numShifters;
        } else {
            count = _count;
        }

        address[] memory shiftedTokens = new address[](count);

        // Begin with the first node in the list
        uint256 n = 0;
        address next = _start;
        if (next == address(0)) {
            next = LinkedList.begin(shiftedTokenList);
        }

        while (n < count) {
            if (next == address(0)) {
                break;
            }
            shiftedTokens[n] = next;
            next = LinkedList.next(shiftedTokenList, next);
            n += 1;
        }
        return shiftedTokens;
    }

    /// @notice Returns the Shifter address for the given ERC20Shifted token
    ///         contract address.
    ///
    /// @param _tokenAddress The address of the ERC20Shifted token contract.
    function getShifterByToken(address _tokenAddress) external view returns (IShifter) {
        return IShifter(shifterByToken[_tokenAddress]);
    }

    /// @notice Returns the Shifter address for the given ERC20Shifted token
    ///         symbol.
    ///
    /// @param _tokenSymbol The symbol of the ERC20Shifted token contract.
    function getShifterBySymbol(string calldata _tokenSymbol) external view returns (IShifter) {
        return IShifter(shifterByToken[tokenBySymbol[_tokenSymbol]]);
    }

    /// @notice Returns the ERC20Shifted address for the given token symbol.
    ///
    /// @param _tokenSymbol The symbol of the ERC20Shifted token contract to
    ///        lookup.
    function getTokenBySymbol(string calldata _tokenSymbol) external view returns (address) {
        return tokenBySymbol[_tokenSymbol];
    }
}

contract DEXAdapter {
    using SafeERC20 for ERC20;

    DEX public dex;
    ShifterRegistry public shifterRegistry;

    event LogTransferIn(address src, uint256 amount);
    event LogTransferOut(address dst, uint256 amount);

    constructor(DEX _dex, ShifterRegistry _shifterRegistry) public {
        shifterRegistry = _shifterRegistry;
        dex = _dex;
    }

    /// @notice Allow anyone to recover funds accidentally sent to the contract.
    /// To withdraw ETH, the token should be set to `0x0`.
    function recoverTokens(address _token) external {
        if (_token == address(0x0)) {
            msg.sender.transfer(address(this).balance);
        } else {
            ERC20(_token).transfer(msg.sender, ERC20(_token).balanceOf(address(this)));
        }
    }

    // TODO: Fix "Stack too deep" error!
    uint256 transferredAmt;

    function trade(
        // Payload
        /*uint256 _relayerFee,*/ address _src, address _dst, uint256 _minDstAmt, bytes calldata _to,
        uint256 _refundBN, bytes calldata _refundAddress,
        // Required
        uint256 _amount, bytes32 _nHash, bytes calldata _sig
    ) external {
        transferredAmt;
        bytes32 pHash = hashTradePayload(_src, _dst, _minDstAmt, _to, _refundBN, _refundAddress);
        // Handle refunds if the refund block number has passed
        if (block.number >= _refundBN) {
            IShifter shifter = shifterRegistry.getShifterByToken(address(_src));
            if (shifter != IShifter(0x0)) {
                transferredAmt = shifter.shiftIn(pHash, _amount, _nHash, _sig);
                shifter.shiftOut(_refundAddress, transferredAmt);
            }
            return;
        }

        transferredAmt = _transferIn(_src, _amount, _nHash, pHash, _sig);
        emit LogTransferIn(_src, transferredAmt);
        _doTrade(_src, _dst, _minDstAmt, _to, transferredAmt);
    }

    function hashTradePayload(
        /*uint256 _relayerFee,*/ address _src, address _dst, uint256 _minDstAmt, bytes memory _to,
        uint256 _refundBN, bytes memory _refundAddress
    ) public pure returns (bytes32) {
        return keccak256(abi.encode(_src, _dst, _minDstAmt, _to, _refundBN, _refundAddress));
    }

    function hashLiquidityPayload(
        address _liquidityProvider,  uint256 _maxBaseToken, address _token,
        uint256 _refundBN, bytes memory _refundAddress
    ) public pure returns (bytes32) {
        return keccak256(abi.encode(_liquidityProvider, _maxBaseToken, _token, _refundBN, _refundAddress));
    }

    function addLiquidity(
        address _liquidityProvider,  uint256 _maxBaseToken, address _token, uint256 _deadline, bytes calldata _refundAddress,
        uint256 _amount, bytes32 _nHash, bytes calldata _sig
        ) external returns (uint256) {
            DEXReserve reserve = dex.reserves(_token);
            require(reserve != DEXReserve(0x0), "unsupported token");
            bytes32 lpHash = hashLiquidityPayload(_liquidityProvider, _maxBaseToken, _token, _deadline, _refundAddress);
            if (block.number > _deadline) {
                uint256 shiftedAmount = shifterRegistry.getShifterByToken(_token).shiftIn(lpHash, _amount, _nHash, _sig);
                shifterRegistry.getShifterByToken(_token).shiftOut(_refundAddress, shiftedAmount);
                return 0;
            }
            require(ERC20(dex.baseToken()).allowance(_liquidityProvider, address(reserve)) >= _maxBaseToken,
                "insufficient base token allowance");
            uint256 transferredAmount = _transferIn(_token, _amount, _nHash, lpHash, _sig);
            ERC20(_token).approve(address(reserve), transferredAmount);
            return reserve.addLiquidity(_liquidityProvider, _maxBaseToken, transferredAmount, _deadline);
    }

    function removeLiquidity(address _token, uint256 _liquidity, bytes calldata _tokenAddress) external {
        DEXReserve reserve = dex.reserves(_token);
        require(reserve != DEXReserve(0x0), "unsupported token");
        ERC20(reserve).safeTransferFrom(msg.sender, address(this), _liquidity);
        (uint256 baseTokenAmount, uint256 quoteTokenAmount) = reserve.removeLiquidity(_liquidity);
        reserve.baseToken().safeTransfer(msg.sender, baseTokenAmount);
        shifterRegistry.getShifterByToken(address(reserve.token())).shiftOut(_tokenAddress, quoteTokenAmount);
    }

    function _doTrade(
        address _src, address _dst, uint256 _minDstAmt, bytes memory _to, uint256 _amount
    ) internal {
        uint256 recvAmt;
        address to;
        IShifter shifter = shifterRegistry.getShifterByToken(address(_dst));

        if (shifter != IShifter(0x0)) {
            to = address(this);
        } else {
            to = _bytesToAddress(_to);
        }

        if (_src == dex.baseToken()) {
            ERC20(_src).approve(address(dex.reserves(_dst)), _amount);
        } else {
            ERC20(_src).approve(address(dex.reserves(_src)), _amount);
        }
        recvAmt = dex.trade(to, _src, _dst, _amount);

        require(recvAmt > 0 && recvAmt >= _minDstAmt, "invalid receive amount");
        if (shifter != IShifter(0x0)) {
            shifter.shiftOut(_to, recvAmt);
        }
        emit LogTransferOut(_dst, recvAmt);
    }

    function _transferIn(
        /*uint256 _relayerFee,*/ address _src, uint256 _amount,
        bytes32 _nHash, bytes32 _pHash, bytes memory _sig
    ) internal returns (uint256) {
        IShifter shifter = shifterRegistry.getShifterByToken(address(_src));
        if (shifter != IShifter(0x0)) {
            return shifter.shiftIn(_pHash, _amount, _nHash, _sig);
        } else {
            ERC20(_src).safeTransferFrom(msg.sender, address(this), _amount);
            return _amount;
        }
    }

    function _bytesToAddress(bytes memory _addr) internal pure returns (address) {
        address addr;
        /* solhint-disable-next-line */ /* solium-disable-next-line */
        assembly {
            addr := mload(add(_addr, 20))
        }
        return addr;
    }

    function calculateReceiveAmount(address _src, address _dst, uint256 _sendAmount) public view returns (uint256) {
        uint256 sendAmount = _sendAmount;

        // Remove shift-in fees
        IShifter srcShifter = shifterRegistry.getShifterByToken(_dst);
        if (srcShifter != IShifter(0x0)) {
            sendAmount = removeFee(_sendAmount, srcShifter.shiftInFee());
        }

        uint256 receiveAmount = dex.calculateReceiveAmount(_src, _dst, sendAmount);

        // Remove shift-out fees
        IShifter dstShifter = shifterRegistry.getShifterByToken(_dst);
        if (dstShifter != IShifter(0x0)) {
            receiveAmount = removeFee(receiveAmount, dstShifter.shiftOutFee());
        }

        return receiveAmount;
    }

    function removeFee(uint256 _amount, uint256 _feeInBips) private view returns (uint256) {
        return _amount - (_amount * _feeInBips)/10000;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract DEX","name":"_dex","type":"address"},{"internalType":"contract ShifterRegistry","name":"_shifterRegistry","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"src","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"LogTransferIn","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"dst","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"LogTransferOut","type":"event"},{"constant":false,"inputs":[{"internalType":"address","name":"_liquidityProvider","type":"address"},{"internalType":"uint256","name":"_maxBaseToken","type":"uint256"},{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_deadline","type":"uint256"},{"internalType":"bytes","name":"_refundAddress","type":"bytes"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes32","name":"_nHash","type":"bytes32"},{"internalType":"bytes","name":"_sig","type":"bytes"}],"name":"addLiquidity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"_src","type":"address"},{"internalType":"address","name":"_dst","type":"address"},{"internalType":"uint256","name":"_sendAmount","type":"uint256"}],"name":"calculateReceiveAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"dex","outputs":[{"internalType":"contract DEX","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"_liquidityProvider","type":"address"},{"internalType":"uint256","name":"_maxBaseToken","type":"uint256"},{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_refundBN","type":"uint256"},{"internalType":"bytes","name":"_refundAddress","type":"bytes"}],"name":"hashLiquidityPayload","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"_src","type":"address"},{"internalType":"address","name":"_dst","type":"address"},{"internalType":"uint256","name":"_minDstAmt","type":"uint256"},{"internalType":"bytes","name":"_to","type":"bytes"},{"internalType":"uint256","name":"_refundBN","type":"uint256"},{"internalType":"bytes","name":"_refundAddress","type":"bytes"}],"name":"hashTradePayload","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"recoverTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_liquidity","type":"uint256"},{"internalType":"bytes","name":"_tokenAddress","type":"bytes"}],"name":"removeLiquidity","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"shifterRegistry","outputs":[{"internalType":"contract ShifterRegistry","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_src","type":"address"},{"internalType":"address","name":"_dst","type":"address"},{"internalType":"uint256","name":"_minDstAmt","type":"uint256"},{"internalType":"bytes","name":"_to","type":"bytes"},{"internalType":"uint256","name":"_refundBN","type":"uint256"},{"internalType":"bytes","name":"_refundAddress","type":"bytes"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes32","name":"_nHash","type":"bytes32"},{"internalType":"bytes","name":"_sig","type":"bytes"}],"name":"trade","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000f65d91333b1d4d3887016b17741ad602d77685940000000000000000000000005d9bf2bad3dd710e4d533681ed16ed1cfeac9e6f

-----Decoded View---------------
Arg [0] : _dex (address): 0xf65d91333B1d4d3887016b17741aD602d7768594
Arg [1] : _shifterRegistry (address): 0x5d9bF2Bad3dD710e4D533681ed16eD1cfeAc9e6F

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000f65d91333b1d4d3887016b17741ad602d7768594
Arg [1] : 0000000000000000000000005d9bf2bad3dd710e4d533681ed16ed1cfeac9e6f

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