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•  contract Ownable
•    - function Ownable()
•    - function transferOwnership(address ne ...
•  contract ERC721
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function transfer(address _to, uint25 ...
•    - function approve(address _to, uint256 ...
•    - function takeOwnership(uint256 _token ...
•  contract Marketplace is Ownable *
•    - function Marketplace(ERC721 _nft, uin ...
•    - function list(address _tokenSeller, u ...
•    - function unlist(address _caller, uint ...
•    - function purchase(address _caller, ui ...
•    - function currentPrice(uint256 _tokenI ...
•    - function listingActive(uint256 _token ...

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/**
 *Submitted for verification at Etherscan.io on 2018-03-13
*/

pragma solidity ^0.4.18;

// File: zeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() 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));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: zeppelin-solidity/contracts/token/ERC721/ERC721.sol

/**
 * @title ERC721 interface
 * @dev see https://github.com/ethereum/eips/issues/721
 */
contract ERC721 {
  event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
  event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);

  function balanceOf(address _owner) public view returns (uint256 _balance);
  function ownerOf(uint256 _tokenId) public view returns (address _owner);
  function transfer(address _to, uint256 _tokenId) public;
  function approve(address _to, uint256 _tokenId) public;
  function takeOwnership(uint256 _tokenId) public;
}

// File: contracts/Marketplace.sol

contract Marketplace is Ownable {
    ERC721 public nft;

    mapping (uint256 => Listing) public listings;

    uint256 public minListingSeconds;
    uint256 public maxListingSeconds;

    struct Listing {
        address seller;
        uint256 startingPrice;
        uint256 minimumPrice;
        uint256 createdAt;
        uint256 durationSeconds;
    }

    event TokenListed(uint256 indexed _tokenId, uint256 _startingPrice, uint256 _minimumPrice, uint256 _durationSeconds, address _seller);
    event TokenUnlisted(uint256 indexed _tokenId, address _unlister);
    event TokenSold(uint256 indexed _tokenId, uint256 _price, uint256 _paidAmount, address indexed _seller, address _buyer);

    modifier nftOnly() {
        require(msg.sender == address(nft));
        _;
    }

    function Marketplace(ERC721 _nft, uint256 _minListingSeconds, uint256 _maxListingSeconds) public {
        nft = _nft;
        minListingSeconds = _minListingSeconds;
        maxListingSeconds = _maxListingSeconds;
    }

    function list(address _tokenSeller, uint256 _tokenId, uint256 _startingPrice, uint256 _minimumPrice, uint256 _durationSeconds) public nftOnly {
        require(_durationSeconds >= minListingSeconds && _durationSeconds <= maxListingSeconds);
        require(_startingPrice >= _minimumPrice);
        require(! listingActive(_tokenId));
        listings[_tokenId] = Listing(_tokenSeller, _startingPrice, _minimumPrice, now, _durationSeconds);
        nft.takeOwnership(_tokenId);
        TokenListed(_tokenId, _startingPrice, _minimumPrice, _durationSeconds, _tokenSeller);
    }

    function unlist(address _caller, uint256 _tokenId) public nftOnly {
        address _seller = listings[_tokenId].seller;
        // Allow owner to unlist (via nft) for when it's time to shut this down
        require(_seller == _caller || address(owner) == _caller);
        nft.transfer(_seller, _tokenId);
        delete listings[_tokenId];
        TokenUnlisted(_tokenId, _caller);
    }

    function purchase(address _caller, uint256 _tokenId, uint256 _totalPaid) public payable nftOnly {
        Listing memory _listing = listings[_tokenId];
        address _seller = _listing.seller;

        require(_caller != _seller); // Doesn't make sense for someone to buy/sell their own token.
        require(listingActive(_tokenId));

        uint256 _price = currentPrice(_tokenId);
        require(_totalPaid >= _price);

        delete listings[_tokenId];

        nft.transfer(_caller, _tokenId);
        _seller.transfer(msg.value);
        TokenSold(_tokenId, _price, _totalPaid, _seller, _caller);
    }

    function currentPrice(uint256 _tokenId) public view returns (uint256) {
        Listing memory listing = listings[_tokenId];
        require(now >= listing.createdAt);

        uint256 _deadline = listing.createdAt + listing.durationSeconds;
        require(now <= _deadline);

        uint256 _elapsedTime = now - listing.createdAt;
        uint256 _progress = (_elapsedTime * 100) / listing.durationSeconds;
        uint256 _delta = listing.startingPrice - listing.minimumPrice;
        return listing.startingPrice - ((_delta * _progress) / 100);
    }

    function listingActive(uint256 _tokenId) internal view returns (bool) {
        Listing memory listing = listings[_tokenId];
        return listing.createdAt + listing.durationSeconds >= now && now >= listing.createdAt;
    }
}

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000000000000000000000000f7ddc72b2b2cc275c1b40e289fa158b24a282d900000000000000000000000000000000000000000000000000000000000000e100000000000000000000000000000000000000000000000000000000000093a80

-----Decoded View---------------
Arg [0] : _nft (address): 0xf7dDC72B2b2cC275C1b40E289FA158b24a282D90
Arg [1] : _minListingSeconds (uint256): 3600
Arg [2] : _maxListingSeconds (uint256): 604800

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000f7ddc72b2b2cc275c1b40e289fa158b24a282d90
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000e10
Arg [2] : 0000000000000000000000000000000000000000000000000000000000093a80

bzzr://9c11da65a9e1acc85831b8cb1db633ba18cca04ec61cb1a2fc293eb036e92ef4