Contract Overview |  OpenSea.io
Balance: 0 Ether
Ether Value: $0
Transactions: 13746 txns
Token Tracker: Project Wyvern Exchange
Misc:
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Contract Creator: 0x0084a81668b9a978416abeb88bc1572816cc7cacat txn 0xedf9fbcf691727068c9fd67f018bc7db73eacdbc198ad48f11cc75fe8baaa1d3
 Latest 25 transactions from a total of 13746 transactions
(+2 PendingTxns)

TxHash Age From To Value [TxFee]
0x546d8071bb9a771ebf9b7586acdeca70209ace185b694fc4d3ff71a7507b348f(pending)0x1cde1ceb01081a9c313671a4e463055e54bd85e4  IN  0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0.0144 Ether(Pending)
0xd6b767eb9f8425e3530f1994183962e63aaa5d5b9ad36a4278d3b15ffa663624(pending)0xd859d7d8603d2dab768d679eeec25930c8fc59c1  IN  0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0.001 Ether(Pending)
0x8160a1606141c5aea504fe53a5d6bd7d3c5740cdbc46aa97a22e4dc1ccdc944c47 mins ago0xab3009dbb3c9a5694ed818cf0d159e069dd55107  IN   OpenSea.io0 Ether0.000734958
0xf0dd6231b6cc1a45d06e6a198593bc6bd7be534b6dcc77626dcdb172d033c2421 hr 38 mins ago0x67cb97c0989321d13573ab24d0fced22830adefe  IN   OpenSea.io0.09 Ether0.0016387722
0xa58f5a0b8107edd3d66cdca368aed1463f117b4cc82f45e8eaeaa64d3e228ce31 hr 38 mins ago0x67cb97c0989321d13573ab24d0fced22830adefe  IN   OpenSea.io0.09 Ether0.00197172
0xc4bc3df83adfde5b8bd4654167ac9229b57a2938b5a07578ad32be258d4abb9f1 hr 47 mins ago0x06d13d1562eb9da28c59e86e9bfc2a87d13afb01  IN   OpenSea.io0.349216667785242 Ether0.0016305856
0x9c7f23e36604ee011126d871d27769792c3f6c9aca8efbe7e2a27b1a623873b61 hr 49 mins ago0x112ab3e7440b6e6b5c0fe0245579755dd78285b3  IN   OpenSea.io0 Ether0.0005226368
0x6c2b6f76961b85d48aee1eb6934070ca416eb97ec07ba030c567009aa7ed90451 hr 50 mins ago0xa4e566c0aa45680ed257ec95931bb67add699560  IN   OpenSea.io0 Ether0.000652784
0xd29890d61ffeb61ef2ddcf8ae4a4ab8c3adc56b87eecdb7d14d97aa9cc0442572 hrs 3 mins ago0x94106f1e7f6bcaa636d431d7104e6a856819395b  IN   OpenSea.io0.2 Ether0.00197172
0x1886cc0cfc910d9282627b8e8da1c06d8d88905f9422f8b48f063a19e6cda1c32 hrs 7 mins ago0x983961f34fc4cfc5eafec371cdba9d56ff8c1935  IN   OpenSea.io0.1 Ether0.001666272
0xfa4d407c160d1b5fe1dc7be2476793ce1a9890954feb392cacaefa68be7cb2c72 hrs 8 mins ago0x983961f34fc4cfc5eafec371cdba9d56ff8c1935  IN   OpenSea.io0 Ether0.00048882
0x57ecf51ab85650c96794df18cde697265192c62a866a735e419555a3f7d2e3c22 hrs 10 mins ago0x005c25473bf2367aa821a7072332820ac9902547  IN   OpenSea.io0 Ether0.0004965
0xc58a4555725ee1d62ac534b84e3cb11a508e2228096c66789c56a3b1d0f9df0f2 hrs 24 mins ago0x93feb402e40d0ca8714034934ef281aa5aa96455  IN   OpenSea.io0.0089 Ether0.002769636
0xf19952bcb7bce67724f7cbe4401d8b76f7bdf962b7cc89056f551077df5d8d032 hrs 36 mins ago0x94106f1e7f6bcaa636d431d7104e6a856819395b  IN   OpenSea.io0.1 Ether0.001478022
0xf5fcf4fe07d8d0a57e71022f15afaa280a9703c5d4694138da03371a36ae46602 hrs 47 mins ago0xcdc1f43c7ca36d42c6aad0bd4a4b6d48986e8f1b  IN   OpenSea.io0.49 Ether0.002078127
0xe6683f7eca776d45c017ae77959a2838665e3c852fb2f22d38a14a537f74efc12 hrs 47 mins ago0xcdc1f43c7ca36d42c6aad0bd4a4b6d48986e8f1b  IN   OpenSea.io0.399617564493322 Ether0.002037208
0x48370a3855d9940a4d9b046e5f43d7984ec3ba67608eb3aa872d40390b2080ee2 hrs 52 mins ago0xcdc1f43c7ca36d42c6aad0bd4a4b6d48986e8f1b  IN   OpenSea.io0.55 Ether0.00245775
0x36855adc877bdd22548996b4e7a4c0515180fadfef859b409520c8ff3ebcedfb2 hrs 56 mins ago0x94106f1e7f6bcaa636d431d7104e6a856819395b  IN   OpenSea.io0.12 Ether0.001970696
0x1aea8e9bb36dd580dea1b792235f04b194ce3517a3d17f552c44a4ddbedf3d443 hrs 43 mins ago0x2b784e9f231cd229ecfc304315cb0b8365487827  IN   OpenSea.io1 Ether0.001734215
0x8302da9b4ab656d0adceffd4190f5a33dbfa294b0f863b4f113b7c9e109271713 hrs 49 mins ago0xc8412eb7c09de312cab570111021723a0ec44628  IN   OpenSea.io0.89 Ether0.001850696
0x44ea083e5ed5888d76a32e0e0d30736eff6c185b5168bb58a797714927a8a8b33 hrs 54 mins ago0xb007f748f2223e205483d80a3b634bfd5268a504  IN   OpenSea.io0 Ether0.000577045
0xc08612085e234007e6da7a2f28904d25331f94cfd6b8c7bd58a4a10dc7e42e284 hrs 15 mins ago0x5fd794a8364198cf74c6e71f7efc1754a2641f30  IN   OpenSea.io0.505711180734591 Ether0.002295189
0xf8a3bf6231449c3a8f0773181450ddc5bc84b7c15c690e894bec79aedebc33824 hrs 29 mins ago0x2af23a40cbab2bf4b50daec11e5f551f6d737fb0  IN   OpenSea.io0 Ether0.001062438
0x51822036767e4add98fa23784fc6e991d753556255f63c736ebbba5e78ae0a204 hrs 32 mins ago0x793cf10f2542ad8a98b5951f632bf8526bc2ac63  IN   OpenSea.io0.07 Ether0.002081457
0x64040b60436af197a27e5a9dfdbc5dc4c34e7a7623329df87f296010d502ccb44 hrs 34 mins ago0x2af23a40cbab2bf4b50daec11e5f551f6d737fb0  IN   OpenSea.io0 Ether0.000735534
[ Download CSV Export  ] 
 Internal Transactions as a result of Contract Execution
 Latest 25 Internal Txns, Click here To View More View All
ParentTxHash Block Age From To Value
0xf0dd6231b6cc1a45d06e6a198593bc6bd7be534b6dcc77626dcdb172d033c24269092911 hr 38 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xf4b0e07b1010b9dc23d369069ab4f2192651d4740.081 Ether
0xf0dd6231b6cc1a45d06e6a198593bc6bd7be534b6dcc77626dcdb172d033c24269092911 hr 38 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.009 Ether
0xa58f5a0b8107edd3d66cdca368aed1463f117b4cc82f45e8eaeaa64d3e228ce369092881 hr 38 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xf4b0e07b1010b9dc23d369069ab4f2192651d4740.081 Ether
0xa58f5a0b8107edd3d66cdca368aed1463f117b4cc82f45e8eaeaa64d3e228ce369092881 hr 38 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.009 Ether
0xc4bc3df83adfde5b8bd4654167ac9229b57a2938b5a07578ad32be258d4abb9f69092471 hr 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x06d13d1562eb9da28c59e86e9bfc2a87d13afb010.000017645343522403 Ether
0xc4bc3df83adfde5b8bd4654167ac9229b57a2938b5a07578ad32be258d4abb9f69092471 hr 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xb007f748f2223e205483d80a3b634bfd5268a5040.314279120197548237 Ether
0xc4bc3df83adfde5b8bd4654167ac9229b57a2938b5a07578ad32be258d4abb9f69092471 hr 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.034919902244172026 Ether
0xd29890d61ffeb61ef2ddcf8ae4a4ab8c3adc56b87eecdb7d14d97aa9cc04425769091872 hrs 3 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xb2ae036ae7a3a88e11de8ebc8bfb30547a0a26030.18 Ether
0xd29890d61ffeb61ef2ddcf8ae4a4ab8c3adc56b87eecdb7d14d97aa9cc04425769091872 hrs 3 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.02 Ether
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0x1886cc0cfc910d9282627b8e8da1c06d8d88905f9422f8b48f063a19e6cda1c369091712 hrs 7 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.0025 Ether
0xc58a4555725ee1d62ac534b84e3cb11a508e2228096c66789c56a3b1d0f9df0f69091052 hrs 24 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x12bcefaff8878f84fdd4ce2f33c3b49ee43de9480.0086775 Ether
0xc58a4555725ee1d62ac534b84e3cb11a508e2228096c66789c56a3b1d0f9df0f69091052 hrs 24 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.0002225 Ether
0xf19952bcb7bce67724f7cbe4401d8b76f7bdf962b7cc89056f551077df5d8d0369090602 hrs 36 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x3d44f67b32454ebc1f579873edf480faa80cd9530.09 Ether
0xf19952bcb7bce67724f7cbe4401d8b76f7bdf962b7cc89056f551077df5d8d0369090602 hrs 36 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.01 Ether
0xf5fcf4fe07d8d0a57e71022f15afaa280a9703c5d4694138da03371a36ae466069090212 hrs 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xf4b0e07b1010b9dc23d369069ab4f2192651d4740.441 Ether
0xf5fcf4fe07d8d0a57e71022f15afaa280a9703c5d4694138da03371a36ae466069090212 hrs 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.049 Ether
0xe6683f7eca776d45c017ae77959a2838665e3c852fb2f22d38a14a537f74efc169090192 hrs 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xcdc1f43c7ca36d42c6aad0bd4a4b6d48986e8f1b0.000013422849856167 Ether
0xe6683f7eca776d45c017ae77959a2838665e3c852fb2f22d38a14a537f74efc169090192 hrs 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xb007f748f2223e205483d80a3b634bfd5268a5040.359643727479119369 Ether
0xe6683f7eca776d45c017ae77959a2838665e3c852fb2f22d38a14a537f74efc169090192 hrs 47 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.039960414164346596 Ether
0x48370a3855d9940a4d9b046e5f43d7984ec3ba67608eb3aa872d40390b2080ee69090042 hrs 52 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xa4e566c0aa45680ed257ec95931bb67add6995600.495 Ether
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0x36855adc877bdd22548996b4e7a4c0515180fadfef859b409520c8ff3ebcedfb69089882 hrs 56 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0xa4e566c0aa45680ed257ec95931bb67add6995600.108 Ether
0x36855adc877bdd22548996b4e7a4c0515180fadfef859b409520c8ff3ebcedfb69089882 hrs 56 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x5b3256965e7c3cf26e11fcaf296dfc8807c010730.012 Ether
0x1aea8e9bb36dd580dea1b792235f04b194ce3517a3d17f552c44a4ddbedf3d4469087973 hrs 43 mins ago0x7be8076f4ea4a4ad08075c2508e481d6c946d12b0x9f1bee52a02890fec054d35476efa97ac48707030.9 Ether
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), EventStructWrongData (very low-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: WyvernExchange
Compiler Text: v0.4.23+commit.124ca40d
Optimization Enabled: Yes
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.13;

library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    if (a == 0) {
      return 0;
    }
    c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return a / b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }
}

contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender)
    public view returns (uint256);

  function transferFrom(address from, address to, uint256 value)
    public returns (bool);

  function approve(address spender, uint256 value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

library ArrayUtils {

    /**
     * Replace bytes in an array with bytes in another array, guarded by a bitmask
     * Efficiency of this function is a bit unpredictable because of the EVM's word-specific model (arrays under 32 bytes will be slower)
     * 
     * @dev Mask must be the size of the byte array. A nonzero byte means the byte array can be changed.
     * @param array The original array
     * @param desired The target array
     * @param mask The mask specifying which bits can be changed
     * @return The updated byte array (the parameter will be modified inplace)
     */
    function guardedArrayReplace(bytes memory array, bytes memory desired, bytes memory mask)
        internal
        pure
    {
        require(array.length == desired.length);
        require(array.length == mask.length);

        uint words = array.length / 0x20;
        uint index = words * 0x20;
        assert(index / 0x20 == words);
        uint i;

        for (i = 0; i < words; i++) {
            /* Conceptually: array[i] = (!mask[i] && array[i]) || (mask[i] && desired[i]), bitwise in word chunks. */
            assembly {
                let commonIndex := mul(0x20, add(1, i))
                let maskValue := mload(add(mask, commonIndex))
                mstore(add(array, commonIndex), or(and(not(maskValue), mload(add(array, commonIndex))), and(maskValue, mload(add(desired, commonIndex)))))
            }
        }

        /* Deal with the last section of the byte array. */
        if (words > 0) {
            /* This overlaps with bytes already set but is still more efficient than iterating through each of the remaining bytes individually. */
            i = words;
            assembly {
                let commonIndex := mul(0x20, add(1, i))
                let maskValue := mload(add(mask, commonIndex))
                mstore(add(array, commonIndex), or(and(not(maskValue), mload(add(array, commonIndex))), and(maskValue, mload(add(desired, commonIndex)))))
            }
        } else {
            /* If the byte array is shorter than a word, we must unfortunately do the whole thing bytewise.
               (bounds checks could still probably be optimized away in assembly, but this is a rare case) */
            for (i = index; i < array.length; i++) {
                array[i] = ((mask[i] ^ 0xff) & array[i]) | (mask[i] & desired[i]);
            }
        }
    }

    /**
     * Test if two arrays are equal
     * Source: https://github.com/GNSPS/solidity-bytes-utils/blob/master/contracts/BytesLib.sol
     * 
     * @dev Arrays must be of equal length, otherwise will return false
     * @param a First array
     * @param b Second array
     * @return Whether or not all bytes in the arrays are equal
     */
    function arrayEq(bytes memory a, bytes memory b)
        internal
        pure
        returns (bool)
    {
        bool success = true;

        assembly {
            let length := mload(a)

            // if lengths don't match the arrays are not equal
            switch eq(length, mload(b))
            case 1 {
                // cb is a circuit breaker in the for loop since there's
                //  no said feature for inline assembly loops
                // cb = 1 - don't breaker
                // cb = 0 - break
                let cb := 1

                let mc := add(a, 0x20)
                let end := add(mc, length)

                for {
                    let cc := add(b, 0x20)
                // the next line is the loop condition:
                // while(uint(mc < end) + cb == 2)
                } eq(add(lt(mc, end), cb), 2) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    // if any of these checks fails then arrays are not equal
                    if iszero(eq(mload(mc), mload(cc))) {
                        // unsuccess:
                        success := 0
                        cb := 0
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }

    /**
     * Unsafe write byte array into a memory location
     *
     * @param index Memory location
     * @param source Byte array to write
     * @return End memory index
     */
    function unsafeWriteBytes(uint index, bytes source)
        internal
        pure
        returns (uint)
    {
        if (source.length > 0) {
            assembly {
                let length := mload(source)
                let end := add(source, add(0x20, length))
                let arrIndex := add(source, 0x20)
                let tempIndex := index
                for { } eq(lt(arrIndex, end), 1) {
                    arrIndex := add(arrIndex, 0x20)
                    tempIndex := add(tempIndex, 0x20)
                } {
                    mstore(tempIndex, mload(arrIndex))
                }
                index := add(index, length)
            }
        }
        return index;
    }

    /**
     * Unsafe write address into a memory location
     *
     * @param index Memory location
     * @param source Address to write
     * @return End memory index
     */
    function unsafeWriteAddress(uint index, address source)
        internal
        pure
        returns (uint)
    {
        uint conv = uint(source) << 0x60;
        assembly {
            mstore(index, conv)
            index := add(index, 0x14)
        }
        return index;
    }

    /**
     * Unsafe write uint into a memory location
     *
     * @param index Memory location
     * @param source uint to write
     * @return End memory index
     */
    function unsafeWriteUint(uint index, uint source)
        internal
        pure
        returns (uint)
    {
        assembly {
            mstore(index, source)
            index := add(index, 0x20)
        }
        return index;
    }

    /**
     * Unsafe write uint8 into a memory location
     *
     * @param index Memory location
     * @param source uint8 to write
     * @return End memory index
     */
    function unsafeWriteUint8(uint index, uint8 source)
        internal
        pure
        returns (uint)
    {
        assembly {
            mstore8(index, source)
            index := add(index, 0x1)
        }
        return index;
    }

}

contract ReentrancyGuarded {

    bool reentrancyLock = false;

    /* Prevent a contract function from being reentrant-called. */
    modifier reentrancyGuard {
        if (reentrancyLock) {
            revert();
        }
        reentrancyLock = true;
        _;
        reentrancyLock = false;
    }

}

contract TokenRecipient {
    event ReceivedEther(address indexed sender, uint amount);
    event ReceivedTokens(address indexed from, uint256 value, address indexed token, bytes extraData);

    /**
     * @dev Receive tokens and generate a log event
     * @param from Address from which to transfer tokens
     * @param value Amount of tokens to transfer
     * @param token Address of token
     * @param extraData Additional data to log
     */
    function receiveApproval(address from, uint256 value, address token, bytes extraData) public {
        ERC20 t = ERC20(token);
        require(t.transferFrom(from, this, value));
        emit ReceivedTokens(from, value, token, extraData);
    }

    /**
     * @dev Receive Ether and generate a log event
     */
    function () payable public {
        emit ReceivedEther(msg.sender, msg.value);
    }
}

contract ExchangeCore is ReentrancyGuarded, Ownable {

    /* The token used to pay exchange fees. */
    ERC20 public exchangeToken;

    /* User registry. */
    ProxyRegistry public registry;

    /* Token transfer proxy. */
    TokenTransferProxy public tokenTransferProxy;

    /* Cancelled / finalized orders, by hash. */
    mapping(bytes32 => bool) public cancelledOrFinalized;

    /* Orders verified by on-chain approval (alternative to ECDSA signatures so that smart contracts can place orders directly). */
    mapping(bytes32 => bool) public approvedOrders;

    /* For split fee orders, minimum required protocol maker fee, in basis points. Paid to owner (who can change it). */
    uint public minimumMakerProtocolFee = 0;

    /* For split fee orders, minimum required protocol taker fee, in basis points. Paid to owner (who can change it). */
    uint public minimumTakerProtocolFee = 0;

    /* Recipient of protocol fees. */
    address public protocolFeeRecipient;

    /* Fee method: protocol fee or split fee. */
    enum FeeMethod { ProtocolFee, SplitFee }

    /* Inverse basis point. */
    uint public constant INVERSE_BASIS_POINT = 10000;

    /* An ECDSA signature. */ 
    struct Sig {
        /* v parameter */
        uint8 v;
        /* r parameter */
        bytes32 r;
        /* s parameter */
        bytes32 s;
    }

    /* An order on the exchange. */
    struct Order {
        /* Exchange address, intended as a versioning mechanism. */
        address exchange;
        /* Order maker address. */
        address maker;
        /* Order taker address, if specified. */
        address taker;
        /* Maker relayer fee of the order, unused for taker order. */
        uint makerRelayerFee;
        /* Taker relayer fee of the order, or maximum taker fee for a taker order. */
        uint takerRelayerFee;
        /* Maker protocol fee of the order, unused for taker order. */
        uint makerProtocolFee;
        /* Taker protocol fee of the order, or maximum taker fee for a taker order. */
        uint takerProtocolFee;
        /* Order fee recipient or zero address for taker order. */
        address feeRecipient;
        /* Fee method (protocol token or split fee). */
        FeeMethod feeMethod;
        /* Side (buy/sell). */
        SaleKindInterface.Side side;
        /* Kind of sale. */
        SaleKindInterface.SaleKind saleKind;
        /* Target. */
        address target;
        /* HowToCall. */
        AuthenticatedProxy.HowToCall howToCall;
        /* Calldata. */
        bytes calldata;
        /* Calldata replacement pattern, or an empty byte array for no replacement. */
        bytes replacementPattern;
        /* Static call target, zero-address for no static call. */
        address staticTarget;
        /* Static call extra data. */
        bytes staticExtradata;
        /* Token used to pay for the order, or the zero-address as a sentinel value for Ether. */
        address paymentToken;
        /* Base price of the order (in paymentTokens). */
        uint basePrice;
        /* Auction extra parameter - minimum bid increment for English auctions, starting/ending price difference. */
        uint extra;
        /* Listing timestamp. */
        uint listingTime;
        /* Expiration timestamp - 0 for no expiry. */
        uint expirationTime;
        /* Order salt, used to prevent duplicate hashes. */
        uint salt;
    }
    
    event OrderApprovedPartOne    (bytes32 indexed hash, address exchange, address indexed maker, address taker, uint makerRelayerFee, uint takerRelayerFee, uint makerProtocolFee, uint takerProtocolFee, address indexed feeRecipient, FeeMethod feeMethod, SaleKindInterface.Side side, SaleKindInterface.SaleKind saleKind, address target);
    event OrderApprovedPartTwo    (bytes32 indexed hash, AuthenticatedProxy.HowToCall howToCall, bytes calldata, bytes replacementPattern, address staticTarget, bytes staticExtradata, address paymentToken, uint basePrice, uint extra, uint listingTime, uint expirationTime, uint salt, bool orderbookInclusionDesired);
    event OrderCancelled          (bytes32 indexed hash);
    event OrdersMatched           (bytes32 buyHash, bytes32 sellHash, address indexed maker, address indexed taker, uint price, bytes32 indexed metadata);

    /**
     * @dev Change the minimum maker fee paid to the protocol (owner only)
     * @param newMinimumMakerProtocolFee New fee to set in basis points
     */
    function changeMinimumMakerProtocolFee(uint newMinimumMakerProtocolFee)
        public
        onlyOwner
    {
        minimumMakerProtocolFee = newMinimumMakerProtocolFee;
    }

    /**
     * @dev Change the minimum taker fee paid to the protocol (owner only)
     * @param newMinimumTakerProtocolFee New fee to set in basis points
     */
    function changeMinimumTakerProtocolFee(uint newMinimumTakerProtocolFee)
        public
        onlyOwner
    {
        minimumTakerProtocolFee = newMinimumTakerProtocolFee;
    }

    /**
     * @dev Change the protocol fee recipient (owner only)
     * @param newProtocolFeeRecipient New protocol fee recipient address
     */
    function changeProtocolFeeRecipient(address newProtocolFeeRecipient)
        public
        onlyOwner
    {
        protocolFeeRecipient = newProtocolFeeRecipient;
    }

    /**
     * @dev Transfer tokens
     * @param token Token to transfer
     * @param from Address to charge fees
     * @param to Address to receive fees
     * @param amount Amount of protocol tokens to charge
     */
    function transferTokens(address token, address from, address to, uint amount)
        internal
    {
        if (amount > 0) {
            require(tokenTransferProxy.transferFrom(token, from, to, amount));
        }
    }

    /**
     * @dev Charge a fee in protocol tokens
     * @param from Address to charge fees
     * @param to Address to receive fees
     * @param amount Amount of protocol tokens to charge
     */
    function chargeProtocolFee(address from, address to, uint amount)
        internal
    {
        transferTokens(exchangeToken, from, to, amount);
    }

    /**
     * @dev Execute a STATICCALL (introduced with Ethereum Metropolis, non-state-modifying external call)
     * @param target Contract to call
     * @param calldata Calldata (appended to extradata)
     * @param extradata Base data for STATICCALL (probably function selector and argument encoding)
     * @return The result of the call (success or failure)
     */
    function staticCall(address target, bytes memory calldata, bytes memory extradata)
        public
        view
        returns (bool result)
    {
        bytes memory combined = new bytes(calldata.length + extradata.length);
        uint index;
        assembly {
            index := add(combined, 0x20)
        }
        index = ArrayUtils.unsafeWriteBytes(index, extradata);
        ArrayUtils.unsafeWriteBytes(index, calldata);
        assembly {
            result := staticcall(gas, target, add(combined, 0x20), mload(combined), mload(0x40), 0)
        }
        return result;
    }

    /**
     * Calculate size of an order struct when tightly packed
     *
     * @param order Order to calculate size of
     * @return Size in bytes
     */
    function sizeOf(Order memory order)
        internal
        pure
        returns (uint)
    {
        return ((0x14 * 7) + (0x20 * 9) + 4 + order.calldata.length + order.replacementPattern.length + order.staticExtradata.length);
    }

    /**
     * @dev Hash an order, returning the canonical order hash, without the message prefix
     * @param order Order to hash
     * @return Hash of order
     */
    function hashOrder(Order memory order)
        internal
        pure
        returns (bytes32 hash)
    {
        /* Unfortunately abi.encodePacked doesn't work here, stack size constraints. */
        uint size = sizeOf(order);
        bytes memory array = new bytes(size);
        uint index;
        assembly {
            index := add(array, 0x20)
        }
        index = ArrayUtils.unsafeWriteAddress(index, order.exchange);
        index = ArrayUtils.unsafeWriteAddress(index, order.maker);
        index = ArrayUtils.unsafeWriteAddress(index, order.taker);
        index = ArrayUtils.unsafeWriteUint(index, order.makerRelayerFee);
        index = ArrayUtils.unsafeWriteUint(index, order.takerRelayerFee);
        index = ArrayUtils.unsafeWriteUint(index, order.makerProtocolFee);
        index = ArrayUtils.unsafeWriteUint(index, order.takerProtocolFee);
        index = ArrayUtils.unsafeWriteAddress(index, order.feeRecipient);
        index = ArrayUtils.unsafeWriteUint8(index, uint8(order.feeMethod));
        index = ArrayUtils.unsafeWriteUint8(index, uint8(order.side));
        index = ArrayUtils.unsafeWriteUint8(index, uint8(order.saleKind));
        index = ArrayUtils.unsafeWriteAddress(index, order.target);
        index = ArrayUtils.unsafeWriteUint8(index, uint8(order.howToCall));
        index = ArrayUtils.unsafeWriteBytes(index, order.calldata);
        index = ArrayUtils.unsafeWriteBytes(index, order.replacementPattern);
        index = ArrayUtils.unsafeWriteAddress(index, order.staticTarget);
        index = ArrayUtils.unsafeWriteBytes(index, order.staticExtradata);
        index = ArrayUtils.unsafeWriteAddress(index, order.paymentToken);
        index = ArrayUtils.unsafeWriteUint(index, order.basePrice);
        index = ArrayUtils.unsafeWriteUint(index, order.extra);
        index = ArrayUtils.unsafeWriteUint(index, order.listingTime);
        index = ArrayUtils.unsafeWriteUint(index, order.expirationTime);
        index = ArrayUtils.unsafeWriteUint(index, order.salt);
        assembly {
            hash := keccak256(add(array, 0x20), size)
        }
        return hash;
    }

    /**
     * @dev Hash an order, returning the hash that a client must sign, including the standard message prefix
     * @param order Order to hash
     * @return Hash of message prefix and order hash per Ethereum format
     */
    function hashToSign(Order memory order)
        internal
        pure
        returns (bytes32)
    {
        return keccak256("\x19Ethereum Signed Message:\n32", hashOrder(order));
    }

    /**
     * @dev Assert an order is valid and return its hash
     * @param order Order to validate
     * @param sig ECDSA signature
     */
    function requireValidOrder(Order memory order, Sig memory sig)
        internal
        view
        returns (bytes32)
    {
        bytes32 hash = hashToSign(order);
        require(validateOrder(hash, order, sig));
        return hash;
    }

    /**
     * @dev Validate order parameters (does *not* check signature validity)
     * @param order Order to validate
     */
    function validateOrderParameters(Order memory order)
        internal
        view
        returns (bool)
    {
        /* Order must be targeted at this protocol version (this Exchange contract). */
        if (order.exchange != address(this)) {
            return false;
        }

        /* Order must possess valid sale kind parameter combination. */
        if (!SaleKindInterface.validateParameters(order.saleKind, order.expirationTime)) {
            return false;
        }

        /* If using the split fee method, order must have sufficient protocol fees. */
        if (order.feeMethod == FeeMethod.SplitFee && (order.makerProtocolFee < minimumMakerProtocolFee || order.takerProtocolFee < minimumTakerProtocolFee)) {
            return false;
        }

        return true;
    }

    /**
     * @dev Validate a provided previously approved / signed order, hash, and signature.
     * @param hash Order hash (already calculated, passed to avoid recalculation)
     * @param order Order to validate
     * @param sig ECDSA signature
     */
    function validateOrder(bytes32 hash, Order memory order, Sig memory sig) 
        internal
        view
        returns (bool)
    {
        /* Not done in an if-conditional to prevent unnecessary ecrecover evaluation, which seems to happen even though it should short-circuit. */

        /* Order must have valid parameters. */
        if (!validateOrderParameters(order)) {
            return false;
        }

        /* Order must have not been canceled or already filled. */
        if (cancelledOrFinalized[hash]) {
            return false;
        }
        
        /* Order authentication. Order must be either:
        /* (a) previously approved */
        if (approvedOrders[hash]) {
            return true;
        }

        /* or (b) ECDSA-signed by maker. */
        if (ecrecover(hash, sig.v, sig.r, sig.s) == order.maker) {
            return true;
        }

        return false;
    }

    /**
     * @dev Approve an order and optionally mark it for orderbook inclusion. Must be called by the maker of the order
     * @param order Order to approve
     * @param orderbookInclusionDesired Whether orderbook providers should include the order in their orderbooks
     */
    function approveOrder(Order memory order, bool orderbookInclusionDesired)
        internal
    {
        /* CHECKS */

        /* Assert sender is authorized to approve order. */
        require(msg.sender == order.maker);

        /* Calculate order hash. */
        bytes32 hash = hashToSign(order);

        /* Assert order has not already been approved. */
        require(!approvedOrders[hash]);

        /* EFFECTS */
    
        /* Mark order as approved. */
        approvedOrders[hash] = true;
  
        /* Log approval event. Must be split in two due to Solidity stack size limitations. */
        {
            emit OrderApprovedPartOne(hash, order.exchange, order.maker, order.taker, order.makerRelayerFee, order.takerRelayerFee, order.makerProtocolFee, order.takerProtocolFee, order.feeRecipient, order.feeMethod, order.side, order.saleKind, order.target);
        }
        {   
            emit OrderApprovedPartTwo(hash, order.howToCall, order.calldata, order.replacementPattern, order.staticTarget, order.staticExtradata, order.paymentToken, order.basePrice, order.extra, order.listingTime, order.expirationTime, order.salt, orderbookInclusionDesired);
        }
    }

    /**
     * @dev Cancel an order, preventing it from being matched. Must be called by the maker of the order
     * @param order Order to cancel
     * @param sig ECDSA signature
     */
    function cancelOrder(Order memory order, Sig memory sig) 
        internal
    {
        /* CHECKS */

        /* Calculate order hash. */
        bytes32 hash = requireValidOrder(order, sig);

        /* Assert sender is authorized to cancel order. */
        require(msg.sender == order.maker);
  
        /* EFFECTS */
      
        /* Mark order as cancelled, preventing it from being matched. */
        cancelledOrFinalized[hash] = true;

        /* Log cancel event. */
        emit OrderCancelled(hash);
    }

    /**
     * @dev Calculate the current price of an order (convenience function)
     * @param order Order to calculate the price of
     * @return The current price of the order
     */
    function calculateCurrentPrice (Order memory order)
        internal  
        view
        returns (uint)
    {
        return SaleKindInterface.calculateFinalPrice(order.side, order.saleKind, order.basePrice, order.extra, order.listingTime, order.expirationTime);
    }

    /**
     * @dev Calculate the price two orders would match at, if in fact they would match (otherwise fail)
     * @param buy Buy-side order
     * @param sell Sell-side order
     * @return Match price
     */
    function calculateMatchPrice(Order memory buy, Order memory sell)
        view
        internal
        returns (uint)
    {
        /* Calculate sell price. */
        uint sellPrice = SaleKindInterface.calculateFinalPrice(sell.side, sell.saleKind, sell.basePrice, sell.extra, sell.listingTime, sell.expirationTime);

        /* Calculate buy price. */
        uint buyPrice = SaleKindInterface.calculateFinalPrice(buy.side, buy.saleKind, buy.basePrice, buy.extra, buy.listingTime, buy.expirationTime);

        /* Require price cross. */
        require(buyPrice >= sellPrice);
        
        /* Maker/taker priority. */
        return sell.feeRecipient != address(0) ? sellPrice : buyPrice;
    }

    /**
     * @dev Execute all ERC20 token / Ether transfers associated with an order match (fees and buyer => seller transfer)
     * @param buy Buy-side order
     * @param sell Sell-side order
     */
    function executeFundsTransfer(Order memory buy, Order memory sell)
        internal
        returns (uint)
    {
        /* Only payable in the special case of unwrapped Ether. */
        if (sell.paymentToken != address(0)) {
            require(msg.value == 0);
        }

        /* Calculate match price. */
        uint price = calculateMatchPrice(buy, sell);

        /* If paying using a token (not Ether), transfer tokens. This is done prior to fee payments to that a seller will have tokens before being charged fees. */
        if (price > 0 && sell.paymentToken != address(0)) {
            transferTokens(sell.paymentToken, buy.maker, sell.maker, price);
        }

        /* Amount that will be received by seller (for Ether). */
        uint receiveAmount = price;

        /* Amount that must be sent by buyer (for Ether). */
        uint requiredAmount = price;

        /* Determine maker/taker and charge fees accordingly. */
        if (sell.feeRecipient != address(0)) {
            /* Sell-side order is maker. */
      
            /* Assert taker fee is less than or equal to maximum fee specified by buyer. */
            require(sell.takerRelayerFee <= buy.takerRelayerFee);

            if (sell.feeMethod == FeeMethod.SplitFee) {
                /* Assert taker fee is less than or equal to maximum fee specified by buyer. */
                require(sell.takerProtocolFee <= buy.takerProtocolFee);

                /* Maker fees are deducted from the token amount that the maker receives. Taker fees are extra tokens that must be paid by the taker. */

                if (sell.makerRelayerFee > 0) {
                    uint makerRelayerFee = SafeMath.div(SafeMath.mul(sell.makerRelayerFee, price), INVERSE_BASIS_POINT);
                    if (sell.paymentToken == address(0)) {
                        receiveAmount = SafeMath.sub(receiveAmount, makerRelayerFee);
                        sell.feeRecipient.transfer(makerRelayerFee);
                    } else {
                        transferTokens(sell.paymentToken, sell.maker, sell.feeRecipient, makerRelayerFee);
                    }
                }

                if (sell.takerRelayerFee > 0) {
                    uint takerRelayerFee = SafeMath.div(SafeMath.mul(sell.takerRelayerFee, price), INVERSE_BASIS_POINT);
                    if (sell.paymentToken == address(0)) {
                        requiredAmount = SafeMath.add(requiredAmount, takerRelayerFee);
                        sell.feeRecipient.transfer(takerRelayerFee);
                    } else {
                        transferTokens(sell.paymentToken, buy.maker, sell.feeRecipient, takerRelayerFee);
                    }
                }

                if (sell.makerProtocolFee > 0) {
                    uint makerProtocolFee = SafeMath.div(SafeMath.mul(sell.makerProtocolFee, price), INVERSE_BASIS_POINT);
                    if (sell.paymentToken == address(0)) {
                        receiveAmount = SafeMath.sub(receiveAmount, makerProtocolFee);
                        protocolFeeRecipient.transfer(makerProtocolFee);
                    } else {
                        transferTokens(sell.paymentToken, sell.maker, protocolFeeRecipient, makerProtocolFee);
                    }
                }

                if (sell.takerProtocolFee > 0) {
                    uint takerProtocolFee = SafeMath.div(SafeMath.mul(sell.takerProtocolFee, price), INVERSE_BASIS_POINT);
                    if (sell.paymentToken == address(0)) {
                        requiredAmount = SafeMath.add(requiredAmount, takerProtocolFee);
                        protocolFeeRecipient.transfer(takerProtocolFee);
                    } else {
                        transferTokens(sell.paymentToken, buy.maker, protocolFeeRecipient, takerProtocolFee);
                    }
                }

            } else {
                /* Charge maker fee to seller. */
                chargeProtocolFee(sell.maker, sell.feeRecipient, sell.makerRelayerFee);

                /* Charge taker fee to buyer. */
                chargeProtocolFee(buy.maker, sell.feeRecipient, sell.takerRelayerFee);
            }
        } else {
            /* Buy-side order is maker. */

            /* Assert taker fee is less than or equal to maximum fee specified by seller. */
            require(buy.takerRelayerFee <= sell.takerRelayerFee);

            if (sell.feeMethod == FeeMethod.SplitFee) {
                /* The Exchange does not escrow Ether, so direct Ether can only be used to with sell-side maker / buy-side taker orders. */
                require(sell.paymentToken != address(0));

                /* Assert taker fee is less than or equal to maximum fee specified by seller. */
                require(buy.takerProtocolFee <= sell.takerProtocolFee);

                if (buy.makerRelayerFee > 0) {
                    makerRelayerFee = SafeMath.div(SafeMath.mul(buy.makerRelayerFee, price), INVERSE_BASIS_POINT);
                    transferTokens(sell.paymentToken, buy.maker, buy.feeRecipient, makerRelayerFee);
                }

                if (buy.takerRelayerFee > 0) {
                    takerRelayerFee = SafeMath.div(SafeMath.mul(buy.takerRelayerFee, price), INVERSE_BASIS_POINT);
                    transferTokens(sell.paymentToken, sell.maker, buy.feeRecipient, takerRelayerFee);
                }

                if (buy.makerProtocolFee > 0) {
                    makerProtocolFee = SafeMath.div(SafeMath.mul(buy.makerProtocolFee, price), INVERSE_BASIS_POINT);
                    transferTokens(sell.paymentToken, buy.maker, protocolFeeRecipient, makerProtocolFee);
                }

                if (buy.takerProtocolFee > 0) {
                    takerProtocolFee = SafeMath.div(SafeMath.mul(buy.takerProtocolFee, price), INVERSE_BASIS_POINT);
                    transferTokens(sell.paymentToken, sell.maker, protocolFeeRecipient, takerProtocolFee);
                }

            } else {
                /* Charge maker fee to buyer. */
                chargeProtocolFee(buy.maker, buy.feeRecipient, buy.makerRelayerFee);
      
                /* Charge taker fee to seller. */
                chargeProtocolFee(sell.maker, buy.feeRecipient, buy.takerRelayerFee);
            }
        }

        if (sell.paymentToken == address(0)) {
            /* Special-case Ether, order must be matched by buyer. */
            require(msg.value >= requiredAmount);
            sell.maker.transfer(receiveAmount);
            /* Allow overshoot for variable-price auctions, refund difference. */
            uint diff = SafeMath.sub(msg.value, requiredAmount);
            if (diff > 0) {
                buy.maker.transfer(diff);
            }
        }

        /* This contract should never hold Ether, however, we cannot assert this, since it is impossible to prevent anyone from sending Ether e.g. with selfdestruct. */

        return price;
    }

    /**
     * @dev Return whether or not two orders can be matched with each other by basic parameters (does not check order signatures / calldata or perform static calls)
     * @param buy Buy-side order
     * @param sell Sell-side order
     * @return Whether or not the two orders can be matched
     */
    function ordersCanMatch(Order memory buy, Order memory sell)
        internal
        view
        returns (bool)
    {
        return (
            /* Must be opposite-side. */
            (buy.side == SaleKindInterface.Side.Buy && sell.side == SaleKindInterface.Side.Sell) &&     
            /* Must use same fee method. */
            (buy.feeMethod == sell.feeMethod) &&
            /* Must use same payment token. */
            (buy.paymentToken == sell.paymentToken) &&
            /* Must match maker/taker addresses. */
            (sell.taker == address(0) || sell.taker == buy.maker) &&
            (buy.taker == address(0) || buy.taker == sell.maker) &&
            /* One must be maker and the other must be taker (no bool XOR in Solidity). */
            ((sell.feeRecipient == address(0) && buy.feeRecipient != address(0)) || (sell.feeRecipient != address(0) && buy.feeRecipient == address(0))) &&
            /* Must match target. */
            (buy.target == sell.target) &&
            /* Must match howToCall. */
            (buy.howToCall == sell.howToCall) &&
            /* Buy-side order must be settleable. */
            SaleKindInterface.canSettleOrder(buy.listingTime, buy.expirationTime) &&
            /* Sell-side order must be settleable. */
            SaleKindInterface.canSettleOrder(sell.listingTime, sell.expirationTime)
        );
    }

    /**
     * @dev Atomically match two orders, ensuring validity of the match, and execute all associated state transitions. Protected against reentrancy by a contract-global lock.
     * @param buy Buy-side order
     * @param buySig Buy-side order signature
     * @param sell Sell-side order
     * @param sellSig Sell-side order signature
     */
    function atomicMatch(Order memory buy, Sig memory buySig, Order memory sell, Sig memory sellSig, bytes32 metadata)
        internal
        reentrancyGuard
    {
        /* CHECKS */
      
        /* Ensure buy order validity and calculate hash if necessary. */
        bytes32 buyHash;
        if (buy.maker == msg.sender) {
            require(validateOrderParameters(buy));
        } else {
            buyHash = requireValidOrder(buy, buySig);
        }

        /* Ensure sell order validity and calculate hash if necessary. */
        bytes32 sellHash;
        if (sell.maker == msg.sender) {
            require(validateOrderParameters(sell));
        } else {
            sellHash = requireValidOrder(sell, sellSig);
        }
        
        /* Must be matchable. */
        require(ordersCanMatch(buy, sell));

        /* Target must exist (prevent malicious selfdestructs just prior to order settlement). */
        uint size;
        address target = sell.target;
        assembly {
            size := extcodesize(target)
        }
        require(size > 0);
      
        /* Must match calldata after replacement, if specified. */ 
        if (buy.replacementPattern.length > 0) {
          ArrayUtils.guardedArrayReplace(buy.calldata, sell.calldata, buy.replacementPattern);
        }
        if (sell.replacementPattern.length > 0) {
          ArrayUtils.guardedArrayReplace(sell.calldata, buy.calldata, sell.replacementPattern);
        }
        require(ArrayUtils.arrayEq(buy.calldata, sell.calldata));

        /* Retrieve delegateProxy contract. */
        OwnableDelegateProxy delegateProxy = registry.proxies(sell.maker);

        /* Proxy must exist. */
        require(delegateProxy != address(0));

        /* Assert implementation. */
        require(delegateProxy.implementation() == registry.delegateProxyImplementation());

        /* Access the passthrough AuthenticatedProxy. */
        AuthenticatedProxy proxy = AuthenticatedProxy(delegateProxy);

        /* EFFECTS */

        /* Mark previously signed or approved orders as finalized. */
        if (msg.sender != buy.maker) {
            cancelledOrFinalized[buyHash] = true;
        }
        if (msg.sender != sell.maker) {
            cancelledOrFinalized[sellHash] = true;
        }

        /* INTERACTIONS */

        /* Execute funds transfer and pay fees. */
        uint price = executeFundsTransfer(buy, sell);

        /* Execute specified call through proxy. */
        require(proxy.proxy(sell.target, sell.howToCall, sell.calldata));

        /* Static calls are intentionally done after the effectful call so they can check resulting state. */

        /* Handle buy-side static call if specified. */
        if (buy.staticTarget != address(0)) {
            require(staticCall(buy.staticTarget, sell.calldata, buy.staticExtradata));
        }

        /* Handle sell-side static call if specified. */
        if (sell.staticTarget != address(0)) {
            require(staticCall(sell.staticTarget, sell.calldata, sell.staticExtradata));
        }

        /* Log match event. */
        emit OrdersMatched(buyHash, sellHash, sell.feeRecipient != address(0) ? sell.maker : buy.maker, sell.feeRecipient != address(0) ? buy.maker : sell.maker, price, metadata);
    }

}

contract Exchange is ExchangeCore {

    /**
     * @dev Call guardedArrayReplace - library function exposed for testing.
     */
    function guardedArrayReplace(bytes array, bytes desired, bytes mask)
        public
        pure
        returns (bytes)
    {
        ArrayUtils.guardedArrayReplace(array, desired, mask);
        return array;
    }

    /**
     * Test copy byte array
     *
     * @param arrToCopy Array to copy
     * @return byte array
     */
    function testCopy(bytes arrToCopy)
        public
        pure
        returns (bytes)
    {
        bytes memory arr = new bytes(arrToCopy.length);
        uint index;
        assembly {
            index := add(arr, 0x20)
        }
        ArrayUtils.unsafeWriteBytes(index, arrToCopy);
        return arr;
    }

    /**
     * Test write address to bytes
     *
     * @param addr Address to write
     * @return byte array
     */
    function testCopyAddress(address addr)
        public
        pure
        returns (bytes)
    {
        bytes memory arr = new bytes(0x14);
        uint index;
        assembly {
            index := add(arr, 0x20)
        }
        ArrayUtils.unsafeWriteAddress(index, addr);
        return arr;
    }

    /**
     * @dev Call calculateFinalPrice - library function exposed for testing.
     */
    function calculateFinalPrice(SaleKindInterface.Side side, SaleKindInterface.SaleKind saleKind, uint basePrice, uint extra, uint listingTime, uint expirationTime)
        public
        view
        returns (uint)
    {
        return SaleKindInterface.calculateFinalPrice(side, saleKind, basePrice, extra, listingTime, expirationTime);
    }

    /**
     * @dev Call hashOrder - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function hashOrder_(
        address[7] addrs,
        uint[9] uints,
        FeeMethod feeMethod,
        SaleKindInterface.Side side,
        SaleKindInterface.SaleKind saleKind,
        AuthenticatedProxy.HowToCall howToCall,
        bytes calldata,
        bytes replacementPattern,
        bytes staticExtradata)
        public
        pure
        returns (bytes32)
    {
        return hashOrder(
          Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], feeMethod, side, saleKind, addrs[4], howToCall, calldata, replacementPattern, addrs[5], staticExtradata, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8])
        );
    }

    /**
     * @dev Call hashToSign - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function hashToSign_(
        address[7] addrs,
        uint[9] uints,
        FeeMethod feeMethod,
        SaleKindInterface.Side side,
        SaleKindInterface.SaleKind saleKind,
        AuthenticatedProxy.HowToCall howToCall,
        bytes calldata,
        bytes replacementPattern,
        bytes staticExtradata)
        public
        pure
        returns (bytes32)
    { 
        return hashToSign(
          Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], feeMethod, side, saleKind, addrs[4], howToCall, calldata, replacementPattern, addrs[5], staticExtradata, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8])
        );
    }

    /**
     * @dev Call validateOrderParameters - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function validateOrderParameters_ (
        address[7] addrs,
        uint[9] uints,
        FeeMethod feeMethod,
        SaleKindInterface.Side side,
        SaleKindInterface.SaleKind saleKind,
        AuthenticatedProxy.HowToCall howToCall,
        bytes calldata,
        bytes replacementPattern,
        bytes staticExtradata)
        view
        public
        returns (bool)
    {
        Order memory order = Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], feeMethod, side, saleKind, addrs[4], howToCall, calldata, replacementPattern, addrs[5], staticExtradata, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8]);
        return validateOrderParameters(
          order
        );
    }

    /**
     * @dev Call validateOrder - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function validateOrder_ (
        address[7] addrs,
        uint[9] uints,
        FeeMethod feeMethod,
        SaleKindInterface.Side side,
        SaleKindInterface.SaleKind saleKind,
        AuthenticatedProxy.HowToCall howToCall,
        bytes calldata,
        bytes replacementPattern,
        bytes staticExtradata,
        uint8 v,
        bytes32 r,
        bytes32 s)
        view
        public
        returns (bool)
    {
        Order memory order = Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], feeMethod, side, saleKind, addrs[4], howToCall, calldata, replacementPattern, addrs[5], staticExtradata, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8]);
        return validateOrder(
          hashToSign(order),
          order,
          Sig(v, r, s)
        );
    }

    /**
     * @dev Call approveOrder - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function approveOrder_ (
        address[7] addrs,
        uint[9] uints,
        FeeMethod feeMethod,
        SaleKindInterface.Side side,
        SaleKindInterface.SaleKind saleKind,
        AuthenticatedProxy.HowToCall howToCall,
        bytes calldata,
        bytes replacementPattern,
        bytes staticExtradata,
        bool orderbookInclusionDesired) 
        public
    {
        Order memory order = Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], feeMethod, side, saleKind, addrs[4], howToCall, calldata, replacementPattern, addrs[5], staticExtradata, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8]);
        return approveOrder(order, orderbookInclusionDesired);
    }

    /**
     * @dev Call cancelOrder - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function cancelOrder_(
        address[7] addrs,
        uint[9] uints,
        FeeMethod feeMethod,
        SaleKindInterface.Side side,
        SaleKindInterface.SaleKind saleKind,
        AuthenticatedProxy.HowToCall howToCall,
        bytes calldata,
        bytes replacementPattern,
        bytes staticExtradata,
        uint8 v,
        bytes32 r,
        bytes32 s)
        public
    {

        return cancelOrder(
          Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], feeMethod, side, saleKind, addrs[4], howToCall, calldata, replacementPattern, addrs[5], staticExtradata, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8]),
          Sig(v, r, s)
        );
    }

    /**
     * @dev Call calculateCurrentPrice - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function calculateCurrentPrice_(
        address[7] addrs,
        uint[9] uints,
        FeeMethod feeMethod,
        SaleKindInterface.Side side,
        SaleKindInterface.SaleKind saleKind,
        AuthenticatedProxy.HowToCall howToCall,
        bytes calldata,
        bytes replacementPattern,
        bytes staticExtradata)
        public
        view
        returns (uint)
    {
        return calculateCurrentPrice(
          Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], feeMethod, side, saleKind, addrs[4], howToCall, calldata, replacementPattern, addrs[5], staticExtradata, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8])
        );
    }

    /**
     * @dev Call ordersCanMatch - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function ordersCanMatch_(
        address[14] addrs,
        uint[18] uints,
        uint8[8] feeMethodsSidesKindsHowToCalls,
        bytes calldataBuy,
        bytes calldataSell,
        bytes replacementPatternBuy,
        bytes replacementPatternSell,
        bytes staticExtradataBuy,
        bytes staticExtradataSell)
        public
        view
        returns (bool)
    {
        Order memory buy = Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], FeeMethod(feeMethodsSidesKindsHowToCalls[0]), SaleKindInterface.Side(feeMethodsSidesKindsHowToCalls[1]), SaleKindInterface.SaleKind(feeMethodsSidesKindsHowToCalls[2]), addrs[4], AuthenticatedProxy.HowToCall(feeMethodsSidesKindsHowToCalls[3]), calldataBuy, replacementPatternBuy, addrs[5], staticExtradataBuy, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8]);
        Order memory sell = Order(addrs[7], addrs[8], addrs[9], uints[9], uints[10], uints[11], uints[12], addrs[10], FeeMethod(feeMethodsSidesKindsHowToCalls[4]), SaleKindInterface.Side(feeMethodsSidesKindsHowToCalls[5]), SaleKindInterface.SaleKind(feeMethodsSidesKindsHowToCalls[6]), addrs[11], AuthenticatedProxy.HowToCall(feeMethodsSidesKindsHowToCalls[7]), calldataSell, replacementPatternSell, addrs[12], staticExtradataSell, ERC20(addrs[13]), uints[13], uints[14], uints[15], uints[16], uints[17]);
        return ordersCanMatch(
          buy,
          sell
        );
    }

    /**
     * @dev Return whether or not two orders' calldata specifications can match
     * @param buyCalldata Buy-side order calldata
     * @param buyReplacementPattern Buy-side order calldata replacement mask
     * @param sellCalldata Sell-side order calldata
     * @param sellReplacementPattern Sell-side order calldata replacement mask
     * @return Whether the orders' calldata can be matched
     */
    function orderCalldataCanMatch(bytes buyCalldata, bytes buyReplacementPattern, bytes sellCalldata, bytes sellReplacementPattern)
        public
        pure
        returns (bool)
    {
        if (buyReplacementPattern.length > 0) {
          ArrayUtils.guardedArrayReplace(buyCalldata, sellCalldata, buyReplacementPattern);
        }
        if (sellReplacementPattern.length > 0) {
          ArrayUtils.guardedArrayReplace(sellCalldata, buyCalldata, sellReplacementPattern);
        }
        return ArrayUtils.arrayEq(buyCalldata, sellCalldata);
    }

    /**
     * @dev Call calculateMatchPrice - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function calculateMatchPrice_(
        address[14] addrs,
        uint[18] uints,
        uint8[8] feeMethodsSidesKindsHowToCalls,
        bytes calldataBuy,
        bytes calldataSell,
        bytes replacementPatternBuy,
        bytes replacementPatternSell,
        bytes staticExtradataBuy,
        bytes staticExtradataSell)
        public
        view
        returns (uint)
    {
        Order memory buy = Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], FeeMethod(feeMethodsSidesKindsHowToCalls[0]), SaleKindInterface.Side(feeMethodsSidesKindsHowToCalls[1]), SaleKindInterface.SaleKind(feeMethodsSidesKindsHowToCalls[2]), addrs[4], AuthenticatedProxy.HowToCall(feeMethodsSidesKindsHowToCalls[3]), calldataBuy, replacementPatternBuy, addrs[5], staticExtradataBuy, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8]);
        Order memory sell = Order(addrs[7], addrs[8], addrs[9], uints[9], uints[10], uints[11], uints[12], addrs[10], FeeMethod(feeMethodsSidesKindsHowToCalls[4]), SaleKindInterface.Side(feeMethodsSidesKindsHowToCalls[5]), SaleKindInterface.SaleKind(feeMethodsSidesKindsHowToCalls[6]), addrs[11], AuthenticatedProxy.HowToCall(feeMethodsSidesKindsHowToCalls[7]), calldataSell, replacementPatternSell, addrs[12], staticExtradataSell, ERC20(addrs[13]), uints[13], uints[14], uints[15], uints[16], uints[17]);
        return calculateMatchPrice(
          buy,
          sell
        );
    }

    /**
     * @dev Call atomicMatch - Solidity ABI encoding limitation workaround, hopefully temporary.
     */
    function atomicMatch_(
        address[14] addrs,
        uint[18] uints,
        uint8[8] feeMethodsSidesKindsHowToCalls,
        bytes calldataBuy,
        bytes calldataSell,
        bytes replacementPatternBuy,
        bytes replacementPatternSell,
        bytes staticExtradataBuy,
        bytes staticExtradataSell,
        uint8[2] vs,
        bytes32[5] rssMetadata)
        public
        payable
    {

        return atomicMatch(
          Order(addrs[0], addrs[1], addrs[2], uints[0], uints[1], uints[2], uints[3], addrs[3], FeeMethod(feeMethodsSidesKindsHowToCalls[0]), SaleKindInterface.Side(feeMethodsSidesKindsHowToCalls[1]), SaleKindInterface.SaleKind(feeMethodsSidesKindsHowToCalls[2]), addrs[4], AuthenticatedProxy.HowToCall(feeMethodsSidesKindsHowToCalls[3]), calldataBuy, replacementPatternBuy, addrs[5], staticExtradataBuy, ERC20(addrs[6]), uints[4], uints[5], uints[6], uints[7], uints[8]),
          Sig(vs[0], rssMetadata[0], rssMetadata[1]),
          Order(addrs[7], addrs[8], addrs[9], uints[9], uints[10], uints[11], uints[12], addrs[10], FeeMethod(feeMethodsSidesKindsHowToCalls[4]), SaleKindInterface.Side(feeMethodsSidesKindsHowToCalls[5]), SaleKindInterface.SaleKind(feeMethodsSidesKindsHowToCalls[6]), addrs[11], AuthenticatedProxy.HowToCall(feeMethodsSidesKindsHowToCalls[7]), calldataSell, replacementPatternSell, addrs[12], staticExtradataSell, ERC20(addrs[13]), uints[13], uints[14], uints[15], uints[16], uints[17]),
          Sig(vs[1], rssMetadata[2], rssMetadata[3]),
          rssMetadata[4]
        );
    }

}

contract WyvernExchange is Exchange {

    string public constant name = "Project Wyvern Exchange";

    string public constant version = "2.2";

    string public constant codename = "Lambton Worm";

    /**
     * @dev Initialize a WyvernExchange instance
     * @param registryAddress Address of the registry instance which this Exchange instance will use
     * @param tokenAddress Address of the token used for protocol fees
     */
    constructor (ProxyRegistry registryAddress, TokenTransferProxy tokenTransferProxyAddress, ERC20 tokenAddress, address protocolFeeAddress) public {
        registry = registryAddress;
        tokenTransferProxy = tokenTransferProxyAddress;
        exchangeToken = tokenAddress;
        protocolFeeRecipient = protocolFeeAddress;
        owner = msg.sender;
    }

}

library SaleKindInterface {

    /**
     * Side: buy or sell.
     */
    enum Side { Buy, Sell }

    /**
     * Currently supported kinds of sale: fixed price, Dutch auction. 
     * English auctions cannot be supported without stronger escrow guarantees.
     * Future interesting options: Vickrey auction, nonlinear Dutch auctions.
     */
    enum SaleKind { FixedPrice, DutchAuction }

    /**
     * @dev Check whether the parameters of a sale are valid
     * @param saleKind Kind of sale
     * @param expirationTime Order expiration time
     * @return Whether the parameters were valid
     */
    function validateParameters(SaleKind saleKind, uint expirationTime)
        pure
        internal
        returns (bool)
    {
        /* Auctions must have a set expiration date. */
        return (saleKind == SaleKind.FixedPrice || expirationTime > 0);
    }

    /**
     * @dev Return whether or not an order can be settled
     * @dev Precondition: parameters have passed validateParameters
     * @param listingTime Order listing time
     * @param expirationTime Order expiration time
     */
    function canSettleOrder(uint listingTime, uint expirationTime)
        view
        internal
        returns (bool)
    {
        return (listingTime < now) && (expirationTime == 0 || now < expirationTime);
    }

    /**
     * @dev Calculate the settlement price of an order
     * @dev Precondition: parameters have passed validateParameters.
     * @param side Order side
     * @param saleKind Method of sale
     * @param basePrice Order base price
     * @param extra Order extra price data
     * @param listingTime Order listing time
     * @param expirationTime Order expiration time
     */
    function calculateFinalPrice(Side side, SaleKind saleKind, uint basePrice, uint extra, uint listingTime, uint expirationTime)
        view
        internal
        returns (uint finalPrice)
    {
        if (saleKind == SaleKind.FixedPrice) {
            return basePrice;
        } else if (saleKind == SaleKind.DutchAuction) {
            uint diff = SafeMath.div(SafeMath.mul(extra, SafeMath.sub(now, listingTime)), SafeMath.sub(expirationTime, listingTime));
            if (side == Side.Sell) {
                /* Sell-side - start price: basePrice. End price: basePrice - extra. */
                return SafeMath.sub(basePrice, diff);
            } else {
                /* Buy-side - start price: basePrice. End price: basePrice + extra. */
                return SafeMath.add(basePrice, diff);
            }
        }
    }

}

contract ProxyRegistry is Ownable {

    /* DelegateProxy implementation contract. Must be initialized. */
    address public delegateProxyImplementation;

    /* Authenticated proxies by user. */
    mapping(address => OwnableDelegateProxy) public proxies;

    /* Contracts pending access. */
    mapping(address => uint) public pending;

    /* Contracts allowed to call those proxies. */
    mapping(address => bool) public contracts;

    /* Delay period for adding an authenticated contract.
       This mitigates a particular class of potential attack on the Wyvern DAO (which owns this registry) - if at any point the value of assets held by proxy contracts exceeded the value of half the WYV supply (votes in the DAO),
       a malicious but rational attacker could buy half the Wyvern and grant themselves access to all the proxy contracts. A delay period renders this attack nonthreatening - given two weeks, if that happened, users would have
       plenty of time to notice and transfer their assets.
    */
    uint public DELAY_PERIOD = 2 weeks;

    /**
     * Start the process to enable access for specified contract. Subject to delay period.
     *
     * @dev ProxyRegistry owner only
     * @param addr Address to which to grant permissions
     */
    function startGrantAuthentication (address addr)
        public
        onlyOwner
    {
        require(!contracts[addr] && pending[addr] == 0);
        pending[addr] = now;
    }

    /**
     * End the process to nable access for specified contract after delay period has passed.
     *
     * @dev ProxyRegistry owner only
     * @param addr Address to which to grant permissions
     */
    function endGrantAuthentication (address addr)
        public
        onlyOwner
    {
        require(!contracts[addr] && pending[addr] != 0 && ((pending[addr] + DELAY_PERIOD) < now));
        pending[addr] = 0;
        contracts[addr] = true;
    }

    /**
     * Revoke access for specified contract. Can be done instantly.
     *
     * @dev ProxyRegistry owner only
     * @param addr Address of which to revoke permissions
     */    
    function revokeAuthentication (address addr)
        public
        onlyOwner
    {
        contracts[addr] = false;
    }

    /**
     * Register a proxy contract with this registry
     *
     * @dev Must be called by the user which the proxy is for, creates a new AuthenticatedProxy
     * @return New AuthenticatedProxy contract
     */
    function registerProxy()
        public
        returns (OwnableDelegateProxy proxy)
    {
        require(proxies[msg.sender] == address(0));
        proxy = new OwnableDelegateProxy(msg.sender, delegateProxyImplementation, abi.encodeWithSignature("initialize(address,address)", msg.sender, address(this)));
        proxies[msg.sender] = proxy;
        return proxy;
    }

}

contract TokenTransferProxy {

    /* Authentication registry. */
    ProxyRegistry public registry;

    /**
     * Call ERC20 `transferFrom`
     *
     * @dev Authenticated contract only
     * @param token ERC20 token address
     * @param from From address
     * @param to To address
     * @param amount Transfer amount
     */
    function transferFrom(address token, address from, address to, uint amount)
        public
        returns (bool)
    {
        require(registry.contracts(msg.sender));
        return ERC20(token).transferFrom(from, to, amount);
    }

}

contract OwnedUpgradeabilityStorage {

  // Current implementation
  address internal _implementation;

  // Owner of the contract
  address private _upgradeabilityOwner;

  /**
   * @dev Tells the address of the owner
   * @return the address of the owner
   */
  function upgradeabilityOwner() public view returns (address) {
    return _upgradeabilityOwner;
  }

  /**
   * @dev Sets the address of the owner
   */
  function setUpgradeabilityOwner(address newUpgradeabilityOwner) internal {
    _upgradeabilityOwner = newUpgradeabilityOwner;
  }

  /**
  * @dev Tells the address of the current implementation
  * @return address of the current implementation
  */
  function implementation() public view returns (address) {
    return _implementation;
  }

  /**
  * @dev Tells the proxy type (EIP 897)
  * @return Proxy type, 2 for forwarding proxy
  */
  function proxyType() public pure returns (uint256 proxyTypeId) {
    return 2;
  }
}

contract AuthenticatedProxy is TokenRecipient, OwnedUpgradeabilityStorage {

    /* Whether initialized. */
    bool initialized = false;

    /* Address which owns this proxy. */
    address public user;

    /* Associated registry with contract authentication information. */
    ProxyRegistry public registry;

    /* Whether access has been revoked. */
    bool public revoked;

    /* Delegate call could be used to atomically transfer multiple assets owned by the proxy contract with one order. */
    enum HowToCall { Call, DelegateCall }

    /* Event fired when the proxy access is revoked or unrevoked. */
    event Revoked(bool revoked);

    /**
     * Initialize an AuthenticatedProxy
     *
     * @param addrUser Address of user on whose behalf this proxy will act
     * @param addrRegistry Address of ProxyRegistry contract which will manage this proxy
     */
    function initialize (address addrUser, ProxyRegistry addrRegistry)
        public
    {
        require(!initialized);
        initialized = true;
        user = addrUser;
        registry = addrRegistry;
    }

    /**
     * Set the revoked flag (allows a user to revoke ProxyRegistry access)
     *
     * @dev Can be called by the user only
     * @param revoke Whether or not to revoke access
     */
    function setRevoke(bool revoke)
        public
    {
        require(msg.sender == user);
        revoked = revoke;
        emit Revoked(revoke);
    }

    /**
     * Execute a message call from the proxy contract
     *
     * @dev Can be called by the user, or by a contract authorized by the registry as long as the user has not revoked access
     * @param dest Address to which the call will be sent
     * @param howToCall Which kind of call to make
     * @param calldata Calldata to send
     * @return Result of the call (success or failure)
     */
    function proxy(address dest, HowToCall howToCall, bytes calldata)
        public
        returns (bool result)
    {
        require(msg.sender == user || (!revoked && registry.contracts(msg.sender)));
        if (howToCall == HowToCall.Call) {
            result = dest.call(calldata);
        } else if (howToCall == HowToCall.DelegateCall) {
            result = dest.delegatecall(calldata);
        }
        return result;
    }

    /**
     * Execute a message call and assert success
     * 
     * @dev Same functionality as `proxy`, just asserts the return value
     * @param dest Address to which the call will be sent
     * @param howToCall What kind of call to make
     * @param calldata Calldata to send
     */
    function proxyAssert(address dest, HowToCall howToCall, bytes calldata)
        public
    {
        require(proxy(dest, howToCall, calldata));
    }

}

contract Proxy {

  /**
  * @dev Tells the address of the implementation where every call will be delegated.
  * @return address of the implementation to which it will be delegated
  */
  function implementation() public view returns (address);

  /**
  * @dev Tells the type of proxy (EIP 897)
  * @return Type of proxy, 2 for upgradeable proxy
  */
  function proxyType() public pure returns (uint256 proxyTypeId);

  /**
  * @dev Fallback function allowing to perform a delegatecall to the given implementation.
  * This function will return whatever the implementation call returns
  */
  function () payable public {
    address _impl = implementation();
    require(_impl != address(0));

    assembly {
      let ptr := mload(0x40)
      calldatacopy(ptr, 0, calldatasize)
      let result := delegatecall(gas, _impl, ptr, calldatasize, 0, 0)
      let size := returndatasize
      returndatacopy(ptr, 0, size)

      switch result
      case 0 { revert(ptr, size) }
      default { return(ptr, size) }
    }
  }
}

contract OwnedUpgradeabilityProxy is Proxy, OwnedUpgradeabilityStorage {
  /**
  * @dev Event to show ownership has been transferred
  * @param previousOwner representing the address of the previous owner
  * @param newOwner representing the address of the new owner
  */
  event ProxyOwnershipTransferred(address previousOwner, address newOwner);

  /**
  * @dev This event will be emitted every time the implementation gets upgraded
  * @param implementation representing the address of the upgraded implementation
  */
  event Upgraded(address indexed implementation);

  /**
  * @dev Upgrades the implementation address
  * @param implementation representing the address of the new implementation to be set
  */
  function _upgradeTo(address implementation) internal {
    require(_implementation != implementation);
    _implementation = implementation;
    emit Upgraded(implementation);
  }

  /**
  * @dev Throws if called by any account other than the owner.
  */
  modifier onlyProxyOwner() {
    require(msg.sender == proxyOwner());
    _;
  }

  /**
   * @dev Tells the address of the proxy owner
   * @return the address of the proxy owner
   */
  function proxyOwner() public view returns (address) {
    return upgradeabilityOwner();
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferProxyOwnership(address newOwner) public onlyProxyOwner {
    require(newOwner != address(0));
    emit ProxyOwnershipTransferred(proxyOwner(), newOwner);
    setUpgradeabilityOwner(newOwner);
  }

  /**
   * @dev Allows the upgradeability owner to upgrade the current implementation of the proxy.
   * @param implementation representing the address of the new implementation to be set.
   */
  function upgradeTo(address implementation) public onlyProxyOwner {
    _upgradeTo(implementation);
  }

  /**
   * @dev Allows the upgradeability owner to upgrade the current implementation of the proxy
   * and delegatecall the new implementation for initialization.
   * @param implementation representing the address of the new implementation to be set.
   * @param data represents the msg.data to bet sent in the low level call. This parameter may include the function
   * signature of the implementation to be called with the needed payload
   */
  function upgradeToAndCall(address implementation, bytes data) payable public onlyProxyOwner {
    upgradeTo(implementation);
    require(address(this).delegatecall(data));
  }
}

contract OwnableDelegateProxy is OwnedUpgradeabilityProxy {

    constructor(address owner, address initialImplementation, bytes calldata)
        public
    {
        setUpgradeabilityOwner(owner);
        _upgradeTo(initialImplementation);
        require(initialImplementation.delegatecall(calldata));
    }

}

    Contract ABI  
[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"tokenTransferProxy","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"target","type":"address"},{"name":"calldata","type":"bytes"},{"name":"extradata","type":"bytes"}],"name":"staticCall","outputs":[{"name":"result","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newMinimumMakerProtocolFee","type":"uint256"}],"name":"changeMinimumMakerProtocolFee","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newMinimumTakerProtocolFee","type":"uint256"}],"name":"changeMinimumTakerProtocolFee","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"array","type":"bytes"},{"name":"desired","type":"bytes"},{"name":"mask","type":"bytes"}],"name":"guardedArrayReplace","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[],"name":"minimumTakerProtocolFee","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"codename","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"addr","type":"address"}],"name":"testCopyAddress","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"name":"arrToCopy","type":"bytes"}],"name":"testCopy","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"name":"addrs","type":"address[7]"},{"name":"uints","type":"uint256[9]"},{"name":"feeMethod","type":"uint8"},{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"howToCall","type":"uint8"},{"name":"calldata","type":"bytes"},{"name":"replacementPattern","type":"bytes"},{"name":"staticExtradata","type":"bytes"}],"name":"calculateCurrentPrice_","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newProtocolFeeRecipient","type":"address"}],"name":"changeProtocolFeeRecipient","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"buyCalldata","type":"bytes"},{"name":"buyReplacementPattern","type":"bytes"},{"name":"sellCalldata","type":"bytes"},{"name":"sellReplacementPattern","type":"bytes"}],"name":"orderCalldataCanMatch","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"name":"addrs","type":"address[7]"},{"name":"uints","type":"uint256[9]"},{"name":"feeMethod","type":"uint8"},{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"howToCall","type":"uint8"},{"name":"calldata","type":"bytes"},{"name":"replacementPattern","type":"bytes"},{"name":"staticExtradata","type":"bytes"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"}],"name":"validateOrder_","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"basePrice","type":"uint256"},{"name":"extra","type":"uint256"},{"name":"listingTime","type":"uint256"},{"name":"expirationTime","type":"uint256"}],"name":"calculateFinalPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"protocolFeeRecipient","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"addrs","type":"address[7]"},{"name":"uints","type":"uint256[9]"},{"name":"feeMethod","type":"uint8"},{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"howToCall","type":"uint8"},{"name":"calldata","type":"bytes"},{"name":"replacementPattern","type":"bytes"},{"name":"staticExtradata","type":"bytes"}],"name":"hashOrder_","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"name":"addrs","type":"address[14]"},{"name":"uints","type":"uint256[18]"},{"name":"feeMethodsSidesKindsHowToCalls","type":"uint8[8]"},{"name":"calldataBuy","type":"bytes"},{"name":"calldataSell","type":"bytes"},{"name":"replacementPatternBuy","type":"bytes"},{"name":"replacementPatternSell","type":"bytes"},{"name":"staticExtradataBuy","type":"bytes"},{"name":"staticExtradataSell","type":"bytes"}],"name":"ordersCanMatch_","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"addrs","type":"address[7]"},{"name":"uints","type":"uint256[9]"},{"name":"feeMethod","type":"uint8"},{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"howToCall","type":"uint8"},{"name":"calldata","type":"bytes"},{"name":"replacementPattern","type":"bytes"},{"name":"staticExtradata","type":"bytes"},{"name":"orderbookInclusionDesired","type":"bool"}],"name":"approveOrder_","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"registry","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"minimumMakerProtocolFee","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"addrs","type":"address[7]"},{"name":"uints","type":"uint256[9]"},{"name":"feeMethod","type":"uint8"},{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"howToCall","type":"uint8"},{"name":"calldata","type":"bytes"},{"name":"replacementPattern","type":"bytes"},{"name":"staticExtradata","type":"bytes"}],"name":"hashToSign_","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"cancelledOrFinalized","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"exchangeToken","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"addrs","type":"address[7]"},{"name":"uints","type":"uint256[9]"},{"name":"feeMethod","type":"uint8"},{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"howToCall","type":"uint8"},{"name":"calldata","type":"bytes"},{"name":"replacementPattern","type":"bytes"},{"name":"staticExtradata","type":"bytes"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"}],"name":"cancelOrder_","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"addrs","type":"address[14]"},{"name":"uints","type":"uint256[18]"},{"name":"feeMethodsSidesKindsHowToCalls","type":"uint8[8]"},{"name":"calldataBuy","type":"bytes"},{"name":"calldataSell","type":"bytes"},{"name":"replacementPatternBuy","type":"bytes"},{"name":"replacementPatternSell","type":"bytes"},{"name":"staticExtradataBuy","type":"bytes"},{"name":"staticExtradataSell","type":"bytes"},{"name":"vs","type":"uint8[2]"},{"name":"rssMetadata","type":"bytes32[5]"}],"name":"atomicMatch_","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"addrs","type":"address[7]"},{"name":"uints","type":"uint256[9]"},{"name":"feeMethod","type":"uint8"},{"name":"side","type":"uint8"},{"name":"saleKind","type":"uint8"},{"name":"howToCall","type":"uint8"},{"name":"calldata","type":"bytes"},{"name":"replacementPattern","type":"bytes"},{"name":"staticExtradata","type":"bytes"}],"name":"validateOrderParameters_","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"INVERSE_BASIS_POINT","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"addrs","type":"address[14]"},{"name":"uints","type":"uint256[18]"},{"name":"feeMethodsSidesKindsHowToCalls","type":"uint8[8]"},{"name":"calldataBuy","type":"bytes"},{"name":"calldataSell","type":"bytes"},{"name":"replacementPatternBuy","type":"bytes"},{"name":"replacementPatternSell","type":"bytes"},{"name":"staticExtradataBuy","type":"bytes"},{"name":"staticExtradataSell","type":"bytes"}],"name":"calculateMatchPrice_","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"approvedOrders","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"registryAddress","type":"address"},{"name":"tokenTransferProxyAddress","type":"address"},{"name":"tokenAddress","type":"address"},{"name":"protocolFeeAddress","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"hash","type":"bytes32"},{"indexed":false,"name":"exchange","type":"address"},{"indexed":true,"name":"maker","type":"address"},{"indexed":false,"name":"taker","type":"address"},{"indexed":false,"name":"makerRelayerFee","type":"uint256"},{"indexed":false,"name":"takerRelayerFee","type":"uint256"},{"indexed":false,"name":"makerProtocolFee","type":"uint256"},{"indexed":false,"name":"takerProtocolFee","type":"uint256"},{"indexed":true,"name":"feeRecipient","type":"address"},{"indexed":false,"name":"feeMethod","type":"uint8"},{"indexed":false,"name":"side","type":"uint8"},{"indexed":false,"name":"saleKind","type":"uint8"},{"indexed":false,"name":"target","type":"address"}],"name":"OrderApprovedPartOne","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"hash","type":"bytes32"},{"indexed":false,"name":"howToCall","type":"uint8"},{"indexed":false,"name":"calldata","type":"bytes"},{"indexed":false,"name":"replacementPattern","type":"bytes"},{"indexed":false,"name":"staticTarget","type":"address"},{"indexed":false,"name":"staticExtradata","type":"bytes"},{"indexed":false,"name":"paymentToken","type":"address"},{"indexed":false,"name":"basePrice","type":"uint256"},{"indexed":false,"name":"extra","type":"uint256"},{"indexed":false,"name":"listingTime","type":"uint256"},{"indexed":false,"name":"expirationTime","type":"uint256"},{"indexed":false,"name":"salt","type":"uint256"},{"indexed":false,"name":"orderbookInclusionDesired","type":"bool"}],"name":"OrderApprovedPartTwo","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"hash","type":"bytes32"}],"name":"OrderCancelled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"buyHash","type":"bytes32"},{"indexed":false,"name":"sellHash","type":"bytes32"},{"indexed":true,"name":"maker","type":"address"},{"indexed":true,"name":"taker","type":"address"},{"indexed":false,"name":"price","type":"uint256"},{"indexed":true,"name":"metadata","type":"bytes32"}],"name":"OrdersMatched","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"}],"name":"OwnershipRenounced","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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0000000000000000000000a839d4b5a36265795eba6894651a8af3d0ae2e68

    Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1000000000000000000000000e5c783ee536cf5e63e792988335c4255169be4e1000000000000000000000000056017c55ae7ae32d12aef7c679df83a85ca75ff000000000000000000000000a839d4b5a36265795eba6894651a8af3d0ae2e68

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
Arg [1] : 000000000000000000000000e5c783ee536cf5e63e792988335c4255169be4e1
Arg [2] : 000000000000000000000000056017c55ae7ae32d12aef7c679df83a85ca75ff
Arg [3] : 000000000000000000000000a839d4b5a36265795eba6894651a8af3d0ae2e68


   Swarm Source:
bzzr://c55d9f4fec75a517a5c565e98d7edb55708cb4e8ffd95df42d9d014ce32a79fc

 

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