Contract 0x43DbEa78dd1a0E6D2fa43f08e109cab95C1679A0

 
 
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0xcf154fb6321f834c7dfaf47e8b9a012d9ecb9478fe3ee76835cbe6b9816a545aTransfer151915032022-07-22 9:19:54138 days 26 mins ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.00434320
0xa5cbe04b92b960dba9381522629ad886baebe754b267e751914724eefbca7644Transfer96108872020-03-05 11:13:001006 days 22 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.00430120
0xe6596e7ff6b431fb037aaf09838aae8d270130976e75cb4166dfcd0f96cacc21Set Creator96095462020-03-05 6:10:031007 days 3 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0009223220
0x811db2ef535e197deaff2aee4c0506f1acd6aa50aa599e0e251dcad73d21d1feSet URI96095462020-03-05 6:10:031007 days 3 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.002185520
0x0a2e10aaa56270f01a51934be7d731cc728463a48ecaf525a3d8b23f8ae1cbd8Set Pass96095462020-03-05 6:10:031007 days 3 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0013649220
0xa6953dc97c94ca51dce6757d2416f45d60099dd3fab49f268f907c33f037dc86Mint96095362020-03-05 6:06:581007 days 3 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0031399620
0xe460a1afa7ea400a8a23a34f0b1fd1e1fb036fb3bd208d4c0c4544af71655f12Set Creator91235922019-12-18 3:00:351085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0009223220
0xa1f458686c8fb6daea4440e83b6c967c382412f209f4c7238f970907bddbd1f9Set URI91235922019-12-18 3:00:351085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0021852620
0x051dd431b7fde2402ea63fafed5e02ee24e0551c8d9962a6500d12d351630917Set Pass91235922019-12-18 3:00:351085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0013649220
0x9da2a54a2b7db6a5027cd675c2179fa8eb1a7255978df20d7a4c32f920bc961eSet Creator91235872019-12-18 2:59:051085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0009223220
0xb187c25595dbac5b9c2ab6d1d06e8ffde5a65dbc131fcd0f3dbbe328fec717d4Set URI91235872019-12-18 2:59:051085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0021852620
0x4a7058d6c2f9d6720b8e7c5b328bd77007dc79ace3abfe58f6f0fd4e63a1c14eSet Pass91235872019-12-18 2:59:051085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0013649220
0x3a35d97d799b364823eb8533d16657ec9e58531a4abf008ee744d67f2084a5d7Transfer91235692019-12-18 2:52:581085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0045838620
0x86d74360dc383f0b83efb0ce8985a41f9de75bd5e22a44150433ac993362dedaTransfer91235632019-12-18 2:52:171085 days 6 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0045838620
0xccc85d8d206174c7c58140d9066c6d04956dd3ae037266e9bec9401b1f05da89Set Pass90937472019-12-12 9:49:281090 days 23 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.000477727
0x0345e39d6f12fe5d892d872525c3958b1c63aed92ae58d0dae3875ac16feeb7eTransfer90936622019-12-12 9:28:061091 days 18 mins ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.00408520
0x31a67d4a6ab739a2ceede07761902d167ca58e45065d5aa8a811a30bdec93ab3Transfer90936392019-12-12 9:23:281091 days 22 mins ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.00400120
0x0c6e7788af2203e4f4c68ab05349c0887524e1d7ab42183333530f1e13f86b18Set Creator90935722019-12-12 9:05:091091 days 41 mins ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0009223220
0x665f034757abd0017b761e89b5a8ead46706bc2b0fd7b3ef4d5e6acd46d1a3e6Set URI90935722019-12-12 9:05:091091 days 41 mins ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.002185520
0x6c567678cc0c7aef34aea2ce023b8079f450259f22f0e7b435cfeb61b898347eSet Pass90935712019-12-12 9:04:571091 days 41 mins ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0013649220
0xa6dcbc23362b9f1b0207808d574da102e0a4912b764fe5907283c6af8dca2e20Mint90935622019-12-12 9:01:551091 days 44 mins ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0031399620
0x04dd7b07b39d642a08565e681036856e4472107456efe581babf2aaa17233e5aSet Pass90932032019-12-12 7:33:131091 days 2 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.000477727
0x981ae5e00770e83d5cfa662b4f67307655451a06e3cd3550e4c7e79fe74ce9daTransfer90931632019-12-12 7:22:251091 days 2 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.00430120
0xa5bb2d504d10caed247d49cc2bbaf74c5e8bb6f570610670e93e1a367b6f0859Set Creator90930862019-12-12 7:00:431091 days 2 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.0009223220
0xc09e5927be967e83b6cd547d7bae3c20878ac2f279aeb335fc761c06fb15f8f1Set URI90930862019-12-12 7:00:431091 days 2 hrs ago0xf127a5a703fe87f77be731cc4b560201c0072dde IN  0x43dbea78dd1a0e6d2fa43f08e109cab95c1679a00 Ether0.002185520
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Contract Source Code Verified (Exact Match)

Contract Name:
DigiArtWorld

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Multiple files format)

File 2 of 13: DigiArtWorld.sol
pragma solidity ^0.4.24;

import "./ERC721Token.sol";
import "./Ownable.sol";

contract DigiArtWorld is ERC721Token, Ownable {
    
    constructor() public ERC721Token("DigiArtWorld", "DAW") {}
    uint256 public burnCount = 0;
    uint256 internal nextId = 0;
    address private holder;
    
    
    
    /*** EVENTS ***/
    event Mint(
        uint256 indexed _artId,
        address indexed _owner
    );

    modifier onlyHolder() {
        require(msg.sender == holder);
        _;
    }
    
    /*** FUNCTIONS ***/
    
    function setHolder(address _requestor) public {
        if(holder==address(0)){
            require(msg.sender == owner);
            holder = _requestor;
        } else {
            require(msg.sender == holder);
            holder = _requestor;
        }
    }
    
    
    function getHolder() external view onlyOwner returns (address) {
        return holder;
    }

    function getrandPass(uint256 _tokenId) external view onlyHolder returns(bytes32){
        return randPass[_tokenId];
    }
    
    
    
    /// create token functions ///
    function mint(address _to) public onlyHolder returns (uint256) {
        require(_to != address(0));
        
        uint256 tokenId = nextId;
        nextId = nextId.add(1);
        emit Mint(tokenId, _to);
        issetPass[tokenId] = false;
        super._mint(_to, tokenId);
        return tokenId;
    }
    
    /// burn token functions ///
    function burn(address _owner, uint256 _tokenId) public {
        require(_chkHoldOrOwn(msg.sender, _tokenId));
        delete artsPassPhrase[_tokenId];
        delete issetPass[_tokenId];
        burnCount.add(1);
        super._burn(_owner, _tokenId);
    }
    
    /// set hash of Metadata ///
    function setURI(uint256 _tokenId, string _uri) public onlyHolder {
        require(exists(_tokenId));
        require(issetURI[_tokenId] == false);
        issetURI[_tokenId] = true;
        _setTokenURI(_tokenId, _uri);
    }

    function resetURI(uint256 _tokenId) public onlyHolder {
        issetURI[_tokenId] = false;
    }
    
    
    function _chkHoldOrOwn(address _target, uint256 _tokenId) internal view returns (bool) {
        bool chk = false;
        if(_target != address(0)){
            if(_target == tokenOwner[_tokenId]){
                chk = true;
            } else if (_target == holder) {
                chk = true;
            }
        }
        return chk;
    }
    
    function setPass(uint256 _tokenId, string _pass) public {
        require(exists(_tokenId));
        require(_chkHoldOrOwn(msg.sender, _tokenId));
        artsPassPhrase[_tokenId] = _pass;
        issetPass[_tokenId] = true;
    }
    
    function setCreator(uint256 _tokenId, address _creator) public onlyHolder {
        require(exists(_tokenId));
        require(tokenToArtist[_tokenId] == address(0));
        tokenToArtist[_tokenId]  = _creator;
    }
    
    function tokenPass(uint256 _tokenId) external view returns (string){
        require(_chkHoldOrOwn(msg.sender, _tokenId));
        return artsPassPhrase[_tokenId];
    }
    
    function transfer(address _from, address _to, uint256 _tokenId) external onlyHolder payable {
        require(_to != address(0));
        require(_to != address(this));
        require(_chkHoldOrOwn(msg.sender, _tokenId));
        
        issetPass[_tokenId] = false;
        artsPassPhrase[_tokenId] = "";
        clearApproval(_from, _tokenId);
        removeTokenFrom(_from, _tokenId);
        addTokenTo(_to, _tokenId);
        _record(_from, _to, _tokenId);
        _setrandPass(_tokenId, _from, _to, block.timestamp);

        emit Transfer(_from, _to, _tokenId);
    }
    
    function tokensOfOwner(address _owner) external view returns (uint256[]){
        uint256 balance = ownedTokens[_owner].length;
        if(balance == 0){
            return new uint256[](0);
        } else {
            uint256[] memory result = new uint256[](balance);
            for(uint256 i = 0; i < balance; i++){
                result[i] = ownedTokens[_owner][i];
            }
            return result;
        }
        
    }
    
}


File 1 of 13: AddressUtils.sol
pragma solidity ^0.4.24;


/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

  /**
   * Returns whether the target address is a contract
   * @dev This function will return false if invoked during the constructor of a contract,
   * as the code is not actually created until after the constructor finishes.
   * @param _addr address to check
   * @return whether the target address is a contract
   */
  function isContract(address _addr) internal view returns (bool) {
    uint256 size;
    // XXX Currently there is no better way to check if there is a contract in an address
    // than to check the size of the code at that address.
    // See https://ethereum.stackexchange.com/a/14016/36603
    // for more details about how this works.
    // TODO Check this again before the Serenity release, because all addresses will be
    // contracts then.
    // solium-disable-next-line security/no-inline-assembly
    assembly { size := extcodesize(_addr) }
    return size > 0;
  }

}


File 3 of 13: ERC165.sol
pragma solidity ^0.4.24;


/**
 * @title ERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
interface ERC165 {

  /**
   * @notice Query if a contract implements an interface
   * @param _interfaceId The interface identifier, as specified in ERC-165
   * @dev Interface identification is specified in ERC-165. This function
   * uses less than 30,000 gas.
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool);
}


File 4 of 13: ERC721.sol
pragma solidity ^0.4.24;

import "./ERC721Basic.sol";


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Enumerable is ERC721Basic {
  function totalSupply() public view returns (uint256);
  function tokenOfOwnerByIndex(
    address _owner,
    uint256 _index
  )
    public
    view
    returns (uint256 _tokenId);

  function tokenByIndex(uint256 _index) public view returns (uint256);
}


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Metadata is ERC721Basic {
  function name() external view returns (string _name);
  function symbol() external view returns (string _symbol);
  function tokenURI(uint256 _tokenId) public view returns (string);
}


/**
 * @title ERC-721 Non-Fungible Token Standard, full implementation interface
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}


File 5 of 13: ERC721Basic.sol
pragma solidity ^0.4.24;

import "./ERC165.sol";


/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Basic is ERC165 {

  bytes4 internal constant InterfaceId_ERC721 = 0x80ac58cd;
  /*
   * 0x80ac58cd ===
   *   bytes4(keccak256('balanceOf(address)')) ^
   *   bytes4(keccak256('ownerOf(uint256)')) ^
   *   bytes4(keccak256('approve(address,uint256)')) ^
   *   bytes4(keccak256('getApproved(uint256)')) ^
   *   bytes4(keccak256('setApprovalForAll(address,bool)')) ^
   *   bytes4(keccak256('isApprovedForAll(address,address)')) ^
   *   bytes4(keccak256('transferFrom(address,address,uint256)')) ^
   *   bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
   *   bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
   */

  bytes4 internal constant InterfaceId_ERC721Exists = 0x4f558e79;
  /*
   * 0x4f558e79 ===
   *   bytes4(keccak256('exists(uint256)'))
   */

  bytes4 internal constant InterfaceId_ERC721Enumerable = 0x780e9d63;
  /**
   * 0x780e9d63 ===
   *   bytes4(keccak256('totalSupply()')) ^
   *   bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
   *   bytes4(keccak256('tokenByIndex(uint256)'))
   */

  bytes4 internal constant InterfaceId_ERC721Metadata = 0x5b5e139f;
  /**
   * 0x5b5e139f ===
   *   bytes4(keccak256('name()')) ^
   *   bytes4(keccak256('symbol()')) ^
   *   bytes4(keccak256('tokenURI(uint256)'))
   */

  event Transfer(
    address indexed _from,
    address indexed _to,
    uint256 indexed _tokenId
  );
  event Approval(
    address indexed _owner,
    address indexed _approved,
    uint256 indexed _tokenId
  );
  event ApprovalForAll(
    address indexed _owner,
    address indexed _operator,
    bool _approved
  );

  function balanceOf(address _owner) public view returns (uint256 _balance);
  function ownerOf(uint256 _tokenId) public view returns (address _owner);
  function exists(uint256 _tokenId) public view returns (bool _exists);

  function approve(address _to, uint256 _tokenId) public;
  function getApproved(uint256 _tokenId)
    public view returns (address _operator);

  function setApprovalForAll(address _operator, bool _approved) public;
  function isApprovedForAll(address _owner, address _operator)
    public view returns (bool);

  function transferFrom(address _from, address _to, uint256 _tokenId) public;
  function safeTransferFrom(address _from, address _to, uint256 _tokenId)
    public;

  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    public;
}


File 6 of 13: ERC721BasicToken.sol
pragma solidity ^0.4.24;

import "./ERC721Basic.sol";
import "./ERC721Receiver.sol";
import "./SafeMath.sol";
import "./AddressUtils.sol";
import "./SupportsInterfaceWithLookup.sol";
import "./Recorder.sol";


/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic, Recorder {

  using SafeMath for uint256;
  using AddressUtils for address;

  // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
  // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
  bytes4 private constant ERC721_RECEIVED = 0x150b7a02;

  // Mapping from token ID to owner
  mapping (uint256 => address) internal tokenOwner;

  // Mapping from token ID to approved address
  mapping (uint256 => address) internal tokenApprovals;

  // Mapping from owner to number of owned token
  mapping (address => uint256) internal ownedTokensCount;

  // Mapping from owner to operator approvals
  mapping (address => mapping (address => bool)) internal operatorApprovals;
  
  // Mapping from token ID to setted passphrase
  mapping (uint256 => bool) public issetPass;
  
  // Mapping from token ID to passphrase
  mapping (uint256 => string) internal artsPassPhrase;
  
  // Mapping generate random pass with tokenId
  mapping(uint256 => bytes32) internal randPass;

  constructor()
    public
  {
    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721);
    _registerInterface(InterfaceId_ERC721Exists);
  }

  /**
   * @dev Gets the balance of the specified address
   * @param _owner address to query the balance of
   * @return uint256 representing the amount owned by the passed address
   */
  function balanceOf(address _owner) public view returns (uint256) {
    require(_owner != address(0));
    return ownedTokensCount[_owner];
  }

  /**
   * @dev Gets the owner of the specified token ID
   * @param _tokenId uint256 ID of the token to query the owner of
   * @return owner address currently marked as the owner of the given token ID
   */
  function ownerOf(uint256 _tokenId) public view returns (address) {
    address owner = tokenOwner[_tokenId];
    require(owner != address(0));
    return owner;
  }

  /**
   * @dev Returns whether the specified token exists
   * @param _tokenId uint256 ID of the token to query the existence of
   * @return whether the token exists
   */
  function exists(uint256 _tokenId) public view returns (bool) {
    address owner = tokenOwner[_tokenId];
    return owner != address(0);
  }

  /**
   * @dev Approves another address to transfer the given token ID
   * The zero address indicates there is no approved address.
   * There can only be one approved address per token at a given time.
   * Can only be called by the token owner or an approved operator.
   * @param _to address to be approved for the given token ID
   * @param _tokenId uint256 ID of the token to be approved
   */
  function approve(address _to, uint256 _tokenId) public {
    address owner = ownerOf(_tokenId);
    require(_to != owner);
    require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

    tokenApprovals[_tokenId] = _to;
    emit Approval(owner, _to, _tokenId);
  }

  /**
   * @dev Gets the approved address for a token ID, or zero if no address set
   * @param _tokenId uint256 ID of the token to query the approval of
   * @return address currently approved for the given token ID
   */
  function getApproved(uint256 _tokenId) public view returns (address) {
    return tokenApprovals[_tokenId];
  }
  
  function _setrandPass(uint256 _tokenId, address _from, address _to, uint256 _timestamp) internal {
      randPass[_tokenId] = keccak256(abi.encodePacked(_tokenId, _from, _to, _timestamp));
  }

  /**
   * @dev Sets or unsets the approval of a given operator
   * An operator is allowed to transfer all tokens of the sender on their behalf
   * @param _to operator address to set the approval
   * @param _approved representing the status of the approval to be set
   */
  function setApprovalForAll(address _to, bool _approved) public {
    require(_to != msg.sender);
    operatorApprovals[msg.sender][_to] = _approved;
    emit ApprovalForAll(msg.sender, _to, _approved);
  }

  /**
   * @dev Tells whether an operator is approved by a given owner
   * @param _owner owner address which you want to query the approval of
   * @param _operator operator address which you want to query the approval of
   * @return bool whether the given operator is approved by the given owner
   */
  function isApprovedForAll(
    address _owner,
    address _operator
  )
    public
    view
    returns (bool)
  {
    return operatorApprovals[_owner][_operator];
  }

  /**
   * @dev Transfers the ownership of a given token ID to another address
   * Usage of this method is discouraged, use `safeTransferFrom` whenever possible
   * Requires the msg sender to be the owner, approved, or operator
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
  */
  function transferFrom(
    address _from,
    address _to,
    uint256 _tokenId
  )
    public
  {
    require(isApprovedOrOwner(msg.sender, _tokenId));
    require(_from != address(0));
    require(_to != address(0));
    
    issetPass[_tokenId] = false;
    artsPassPhrase[_tokenId] = "";
    clearApproval(_from, _tokenId);
    removeTokenFrom(_from, _tokenId);
    addTokenTo(_to, _tokenId);
    _record(_from, _to, _tokenId);
    _setrandPass(_tokenId, _from, _to, block.timestamp);
    
    emit Transfer(_from, _to, _tokenId);
  }

  /**
   * @dev Safely transfers the ownership of a given token ID to another address
   * If the target address is a contract, it must implement `onERC721Received`,
   * which is called upon a safe transfer, and return the magic value
   * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
   * the transfer is reverted.
   *
   * Requires the msg sender to be the owner, approved, or operator
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
  */
  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId
  )
    public
  {
    // solium-disable-next-line arg-overflow
    safeTransferFrom(_from, _to, _tokenId, "");
  }

  /**
   * @dev Safely transfers the ownership of a given token ID to another address
   * If the target address is a contract, it must implement `onERC721Received`,
   * which is called upon a safe transfer, and return the magic value
   * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
   * the transfer is reverted.
   * Requires the msg sender to be the owner, approved, or operator
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
   * @param _data bytes data to send along with a safe transfer check
   */
  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    public
  {
    transferFrom(_from, _to, _tokenId);
    // solium-disable-next-line arg-overflow
    require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
  }

  /**
   * @dev Returns whether the given spender can transfer a given token ID
   * @param _spender address of the spender to query
   * @param _tokenId uint256 ID of the token to be transferred
   * @return bool whether the msg.sender is approved for the given token ID,
   *  is an operator of the owner, or is the owner of the token
   */
  function isApprovedOrOwner(
    address _spender,
    uint256 _tokenId
  )
    internal
    view
    returns (bool)
  {
    address owner = ownerOf(_tokenId);
    // Disable solium check because of
    // https://github.com/duaraghav8/Solium/issues/175
    // solium-disable-next-line operator-whitespace
    return (
      _spender == owner ||
      getApproved(_tokenId) == _spender ||
      isApprovedForAll(owner, _spender)
    );
  }

  /**
   * @dev Internal function to mint a new token
   * Reverts if the given token ID already exists
   * @param _to The address that will own the minted token
   * @param _tokenId uint256 ID of the token to be minted by the msg.sender
   */
  function _mint(address _to, uint256 _tokenId) internal {
    require(_to != address(0));
    addTokenTo(_to, _tokenId);
    emit Transfer(address(0), _to, _tokenId);
  }

  /**
   * @dev Internal function to burn a specific token
   * Reverts if the token does not exist
   * @param _tokenId uint256 ID of the token being burned by the msg.sender
   */
  function _burn(address _owner, uint256 _tokenId) internal {
    clearApproval(_owner, _tokenId);
    removeTokenFrom(_owner, _tokenId);
    emit Transfer(_owner, address(0), _tokenId);
  }

  /**
   * @dev Internal function to clear current approval of a given token ID
   * Reverts if the given address is not indeed the owner of the token
   * @param _owner owner of the token
   * @param _tokenId uint256 ID of the token to be transferred
   */
  function clearApproval(address _owner, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _owner);
    if (tokenApprovals[_tokenId] != address(0)) {
      tokenApprovals[_tokenId] = address(0);
    }
  }

  /**
   * @dev Internal function to add a token ID to the list of a given address
   * @param _to address representing the new owner of the given token ID
   * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
   */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    require(tokenOwner[_tokenId] == address(0));
    tokenOwner[_tokenId] = _to;
    ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
  }

  /**
   * @dev Internal function to remove a token ID from the list of a given address
   * @param _from address representing the previous owner of the given token ID
   * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
   */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _from);
    ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
    tokenOwner[_tokenId] = address(0);
  }

  /**
   * @dev Internal function to invoke `onERC721Received` on a target address
   * The call is not executed if the target address is not a contract
   * @param _from address representing the previous owner of the given token ID
   * @param _to target address that will receive the tokens
   * @param _tokenId uint256 ID of the token to be transferred
   * @param _data bytes optional data to send along with the call
   * @return whether the call correctly returned the expected magic value
   */
  function checkAndCallSafeTransfer(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    internal
    returns (bool)
  {
    if (!_to.isContract()) {
      return true;
    }
    bytes4 retval = ERC721Receiver(_to).onERC721Received(
      msg.sender, _from, _tokenId, _data);
    return (retval == ERC721_RECEIVED);
  }
}

File 7 of 13: ERC721Holder.sol
pragma solidity ^0.4.24;

import "./ERC721Receiver.sol";


contract ERC721Holder is ERC721Receiver {
  function onERC721Received(
    address,
    address,
    uint256,
    bytes
  )
    public
    returns(bytes4)
  {
    return ERC721_RECEIVED;
  }
}





File 8 of 13: ERC721Receiver.sol
pragma solidity ^0.4.24;


/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
contract ERC721Receiver {
  /**
   * @dev Magic value to be returned upon successful reception of an NFT
   *  Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`,
   *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
   */
  bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;

  /**
   * @notice Handle the receipt of an NFT
   * @dev The ERC721 smart contract calls this function on the recipient
   * after a `safetransfer`. This function MAY throw to revert and reject the
   * transfer. Return of other than the magic value MUST result in the
   * transaction being reverted.
   * Note: the contract address is always the message sender.
   * @param _operator The address which called `safeTransferFrom` function
   * @param _from The address which previously owned the token
   * @param _tokenId The NFT identifier which is being transferred
   * @param _data Additional data with no specified format
   * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
   */
  function onERC721Received(
    address _operator,
    address _from,
    uint256 _tokenId,
    bytes _data
  )
    public
    returns(bytes4);
}


File 9 of 13: ERC721Token.sol
pragma solidity ^0.4.24;

import "./ERC721.sol";
import "./ERC721BasicToken.sol";
import "./SupportsInterfaceWithLookup.sol";


/**
 * @title Full ERC721 Token
 * This implementation includes all the required and some optional functionality of the ERC721 standard
 * Moreover, it includes approve all functionality using operator terminology
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Token is SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 {

  // Token name
  string internal name_;

  // Token symbol
  string internal symbol_;

  // Mapping from owner to list of owned token IDs
  mapping(address => uint256[]) internal ownedTokens;

  // Mapping from token ID to index of the owner tokens list
  mapping(uint256 => uint256) internal ownedTokensIndex;

  // Array with all token ids, used for enumeration
  uint256[] internal allTokens;

  // Mapping from token id to position in the allTokens array
  mapping(uint256 => uint256) internal allTokensIndex;

  // Optional mapping for token URIs
  mapping(uint256 => string) internal tokenURIs;
  
  // additional check isset token URIs
  mapping(uint256 => bool) public issetURI;
  
  // additional token creator address
  mapping(uint256 => address) public tokenToArtist;

  /**
   * @dev Constructor function
   */
  constructor(string _name, string _symbol) public {
    name_ = _name;
    symbol_ = _symbol;

    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721Enumerable);
    _registerInterface(InterfaceId_ERC721Metadata);
  }

  /**
   * @dev Gets the token name
   * @return string representing the token name
   */
  function name() external view returns (string) {
    return name_;
  }

  /**
   * @dev Gets the token symbol
   * @return string representing the token symbol
   */
  function symbol() external view returns (string) {
    return symbol_;
  }

  /**
   * @dev Returns an URI for a given token ID
   * Throws if the token ID does not exist. May return an empty string.
   * @param _tokenId uint256 ID of the token to query
   */
  function tokenURI(uint256 _tokenId) public view returns (string) {
    require(exists(_tokenId));
    return tokenURIs[_tokenId];
  }

  /**
   * @dev Gets the token ID at a given index of the tokens list of the requested owner
   * @param _owner address owning the tokens list to be accessed
   * @param _index uint256 representing the index to be accessed of the requested tokens list
   * @return uint256 token ID at the given index of the tokens list owned by the requested address
   */
  function tokenOfOwnerByIndex(
    address _owner,
    uint256 _index
  )
    public
    view
    returns (uint256)
  {
    require(_index < balanceOf(_owner));
    return ownedTokens[_owner][_index];
  }

  /**
   * @dev Gets the total amount of tokens stored by the contract
   * @return uint256 representing the total amount of tokens
   */
  function totalSupply() public view returns (uint256) {
    return allTokens.length;
  }

  /**
   * @dev Gets the token ID at a given index of all the tokens in this contract
   * Reverts if the index is greater or equal to the total number of tokens
   * @param _index uint256 representing the index to be accessed of the tokens list
   * @return uint256 token ID at the given index of the tokens list
   */
  function tokenByIndex(uint256 _index) public view returns (uint256) {
    require(_index < totalSupply());
    return allTokens[_index];
  }

  /**
   * @dev Internal function to set the token URI for a given token
   * Reverts if the token ID does not exist
   * @param _tokenId uint256 ID of the token to set its URI
   * @param _uri string URI to assign
   */
  function _setTokenURI(uint256 _tokenId, string _uri) internal {
    require(exists(_tokenId));
    tokenURIs[_tokenId] = _uri;
  }

  /**
   * @dev Internal function to add a token ID to the list of a given address
   * @param _to address representing the new owner of the given token ID
   * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
   */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    super.addTokenTo(_to, _tokenId);
    uint256 length = ownedTokens[_to].length;
    ownedTokens[_to].push(_tokenId);
    ownedTokensIndex[_tokenId] = length;
  }

  /**
   * @dev Internal function to remove a token ID from the list of a given address
   * @param _from address representing the previous owner of the given token ID
   * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
   */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    super.removeTokenFrom(_from, _tokenId);

    // To prevent a gap in the array, we store the last token in the index of the token to delete, and
    // then delete the last slot.
    uint256 tokenIndex = ownedTokensIndex[_tokenId];
    uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
    uint256 lastToken = ownedTokens[_from][lastTokenIndex];

    ownedTokens[_from][tokenIndex] = lastToken;
    // This also deletes the contents at the last position of the array
    ownedTokens[_from].length--;

    // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
    // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping
    // the lastToken to the first position, and then dropping the element placed in the last position of the list

    ownedTokensIndex[_tokenId] = 0;
    ownedTokensIndex[lastToken] = tokenIndex;
  }

  /**
   * @dev Internal function to mint a new token
   * Reverts if the given token ID already exists
   * @param _to address the beneficiary that will own the minted token
   * @param _tokenId uint256 ID of the token to be minted by the msg.sender
   */
  function _mint(address _to, uint256 _tokenId) internal {
    super._mint(_to, _tokenId);

    allTokensIndex[_tokenId] = allTokens.length;
    allTokens.push(_tokenId);
  }

  /**
   * @dev Internal function to burn a specific token
   * Reverts if the token does not exist
   * @param _owner owner of the token to burn
   * @param _tokenId uint256 ID of the token being burned by the msg.sender
   */
  function _burn(address _owner, uint256 _tokenId) internal {
    super._burn(_owner, _tokenId);

    // Clear metadata (if any)
    if (bytes(tokenURIs[_tokenId]).length != 0) {
      delete tokenURIs[_tokenId];
    }

    // Reorg all tokens array
    uint256 tokenIndex = allTokensIndex[_tokenId];
    uint256 lastTokenIndex = allTokens.length.sub(1);
    uint256 lastToken = allTokens[lastTokenIndex];
    allTokens[tokenIndex] = lastToken;
    allTokens[lastTokenIndex] = 0;

    allTokens.length--;
    allTokensIndex[_tokenId] = 0;
    allTokensIndex[lastToken] = tokenIndex;
  }

}


File 10 of 13: Ownable.sol
pragma solidity ^0.4.24;


/**
 * @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 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 relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
   /*
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }
    */
  /**
   * @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 {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}


File 11 of 13: Recorder.sol
pragma solidity ^0.4.24;

contract Recorder {
    
    struct Record{
        address from;
        address to;
        uint256 tokenId;
        uint256 transferTime;
    }
    
    mapping(uint256 => uint256) public tokenIdToRecIndex;
    
    Record[] public recs;
    
    function _record(address _from, address _to, uint256 _tokenId) internal {
        uint256 index = recs.push(Record(_from, _to, _tokenId, block.timestamp)) - 1;
        tokenIdToRecIndex[_tokenId] = index;
    }

    function totalRecords() external view returns(uint256) {
        uint256 count = recs.length;
        return count;
    }

}


File 12 of 13: SafeMath.sol
pragma solidity ^0.4.24;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    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;
  }
}


File 13 of 13: SupportsInterfaceWithLookup.sol
pragma solidity ^0.4.24;

import "./ERC165.sol";


/**
 * @title SupportsInterfaceWithLookup
 * @author Matt Condon (@shrugs)
 * @dev Implements ERC165 using a lookup table.
 */
contract SupportsInterfaceWithLookup is ERC165 {

  bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7;
  /**
   * 0x01ffc9a7 ===
   *   bytes4(keccak256('supportsInterface(bytes4)'))
   */

  /**
   * @dev a mapping of interface id to whether or not it's supported
   */
  mapping(bytes4 => bool) internal supportedInterfaces;

  /**
   * @dev A contract implementing SupportsInterfaceWithLookup
   * implement ERC165 itself
   */
  constructor()
    public
  {
    _registerInterface(InterfaceId_ERC165);
  }

  /**
   * @dev implement supportsInterface(bytes4) using a lookup table
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool)
  {
    return supportedInterfaces[_interfaceId];
  }

  /**
   * @dev private method for registering an interface
   */
  function _registerInterface(bytes4 _interfaceId)
    internal
  {
    require(_interfaceId != 0xffffffff);
    supportedInterfaces[_interfaceId] = true;
  }
}


Contract Security Audit

Contract ABI

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Swarm Source

bzzr://ee75469f43e177ed2c6699a1efed2bc1c4397875fcd8f46373d6fe098dbe00dd
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.