Contract 0x31AF195dB332bc9203d758C74dF5A5C5e597cDb7

 
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0x547d85b02833eed1aeaf6caadd0f3c4ebcc09452eff0b0681a3537c8dfa84eda114784132020-12-18 17:03:2176 days 5 hrs ago0xaf292a733bfc2cd19382aefa022ec33e3c95c838 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.004107840
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0x20a61dfb54dc90c0b15c17521bd3bdc888d2de016c0f26909acf10b6d1e73de9111087722020-10-22 22:32:17133 days 15 mins ago0x458b56eb7bb28b8cbcf22c3ad2ef78b956a89acd IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00336332535
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0xa0a0eca7143735919b2f1acac9ea5a3829b789ffdc6618274f6881610dfec58b110558022020-10-14 19:40:46141 days 3 hrs ago0xbe7abe5083ae893f05321c17bfb5a42fff7f3888 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.002268950
0x729d018620ad7a5da73a88c6155780217f00eeda3daa3232eb6e7c77bf730c03110147132020-10-08 11:43:33147 days 11 hrs ago0x71806d1b84c2f24db92e0112091369f52034444d IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00356205549
0x491c42920a5a6322133b8647329dcf4a2b0c003e6fae0eeb022993d3516c7296109916732020-10-04 21:11:49151 days 1 hr ago0xeae39ebb8bde8a305c7c29e07488144ed8550a30 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00509303553
0x51b99bea473cb04816db181d86cc1c4bd26442d2fe9166d3580a17227dfa46b2109866772020-10-04 2:26:53151 days 20 hrs ago0x1313abfb7f89bbddfd9bcc150dcdafe60e227fc7 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00267680268359.0046
0x4379e9cf41c65469ca141e305d996855b0dfabc9211f9620f5b4bce2487ae9e7108096642020-09-06 18:38:22179 days 4 hrs ago0xd3f714357a3a5ab971941ca475a006814edd0d2b IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00435628896
0x9df6c7273d9e6b16213269d167fc3fe16c96a858d51e3f2eca2a48082c5912bb106312862020-08-10 9:08:17206 days 13 hrs ago0xb63387022ff1843d4e332e518d8f885683c7d00f IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.0046741171103.004035
0x21d680c77efd5764eb84f5513a745959e3bed049c81ac42382aa3e7998f78564104842552020-07-18 15:28:48229 days 7 hrs ago0x14d591e70c1a63736970e9deaa8ad1e7dc178b1b IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.0028394579462.59
0x217dc465d939d3e10c35f851ab64453b9f27ad2ee9604bae1b1866bdb9fda428104628212020-07-15 7:43:56232 days 15 hrs ago0xd3f714357a3a5ab971941ca475a006814edd0d2b IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00217814448
0x125c6632e00b22190befccb707c14fccf8e81e6960af84f7f51df5ccab65243a104226072020-07-09 2:21:52238 days 20 hrs ago0x202cde779e62135b63cad3951de6fa07e4c2385f IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00225354531
0xa80485d7a5e2e2a8741f6f7be4ad364859f6a85a1b60886f741272a0e02465e3104022932020-07-05 23:08:05241 days 23 hrs ago0x2135a897998ed441a806456fab5328375341cac7 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00099831622
0x9677e70b3caa43a61da8a1f8d9d6d215976d313d0eb57f5ce1d92450cbec3cbb104020122020-07-05 22:09:12242 days 38 mins ago0x69a67822df2801f4a7cdd419f5e6585bbf8db4f4 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00199877620.8
0x7cf1aa81f0ee8e327a037443fb9a74997e11622dc25cf210cb2915e71c3e249f103974492020-07-05 5:16:46242 days 17 hrs ago0x9028afd8e91a77d51cce8d11d0449f495325331f IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00108907224
0xb38c49ce77e7f1dddece468fc06fa5d9e045e9b3fe94b05c0df93780b1306812103837672020-07-03 2:19:41244 days 20 hrs ago0xaf292a733bfc2cd19382aefa022ec33e3c95c838 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.0026700726
0xe6be2d2b0e2f8c4f2cca6e6b6aab9346e5dcba7b3ee966f23b20716249bc9a40103067602020-06-21 3:40:36256 days 19 hrs ago0xd77e09b22d28eab54fe5a4d7294726815048d085 IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00125242515
0x0300af6ebf3b137f063f01795c6b1a2593129f73fb1f352e27438f36f3128e97102995132020-06-20 0:53:44257 days 21 hrs ago0xfc7b99980803701252d313ea1805f05d931e68dc IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.0022213071219.994663311
0x803badaf5691dd088523e16fa5ba1847345caa0d2640fc2d068eb7bad5fd2922102991052020-06-19 23:25:32257 days 23 hrs ago0xfc7b99980803701252d313ea1805f05d931e68dc IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.0031106628
0x4c3ff5de0d14ed762f5d449d3bb273f2d918a417598715ff6e48d3fd5dd7f48d102990922020-06-19 23:21:16257 days 23 hrs ago0xfc7b99980803701252d313ea1805f05d931e68dc IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.0029930628
0x6d9fc4873598c21ea142e8e1a42a2c59a7387285507e81886edd93f9a07056d8102990752020-06-19 23:16:14257 days 23 hrs ago0xfc7b99980803701252d313ea1805f05d931e68dc IN  0x31af195db332bc9203d758c74df5a5c5e597cdb70 Ether0.00299956503927.000000357
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xa6dda780878d48853fe6cd96c7c1ebeaed7bfa01

Contract Name:
Token

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-11-16
*/

pragma solidity ^0.4.24;

// File: contracts/openzeppelin-solidity/introspection/ERC165.sol

/**
 * @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: contracts/openzeppelin-solidity/token/ERC721/ERC721Basic.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 {
  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: contracts/openzeppelin-solidity/token/ERC721/ERC721.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: contracts/openzeppelin-solidity/token/ERC721/ERC721Receiver.sol

/**
 * @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 transfered
   * @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: contracts/openzeppelin-solidity/math/SafeMath.sol

/**
 * @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: contracts/openzeppelin-solidity/AddressUtils.sol

/**
 * 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: contracts/openzeppelin-solidity/introspection/SupportsInterfaceWithLookup.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;
  }
}

// File: contracts/openzeppelin-solidity/token/ERC721/ERC721BasicToken.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 {

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

  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;

  /**
   * @dev Guarantees msg.sender is owner of the given token
   * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
   */
  modifier onlyOwnerOf(uint256 _tokenId) {
    require(ownerOf(_tokenId) == msg.sender);
    _;
  }

  /**
   * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
   * @param _tokenId uint256 ID of the token to validate
   */
  modifier canTransfer(uint256 _tokenId) {
    require(isApprovedOrOwner(msg.sender, _tokenId));
    _;
  }

  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];
  }

  /**
   * @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
    canTransfer(_tokenId)
  {
    require(_from != address(0));
    require(_to != address(0));

    clearApproval(_from, _tokenId);
    removeTokenFrom(_from, _tokenId);
    addTokenTo(_to, _tokenId);

    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
    canTransfer(_tokenId)
  {
    // 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
    canTransfer(_tokenId)
  {
    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: contracts/openzeppelin-solidity/token/ERC721/ERC721Token.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 {

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

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

  // 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;

  /**
   * @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);

    uint256 tokenIndex = ownedTokensIndex[_tokenId];
    uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
    uint256 lastToken = ownedTokens[_from][lastTokenIndex];

    ownedTokens[_from][tokenIndex] = lastToken;
    ownedTokens[_from][lastTokenIndex] = 0;
    // 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

    ownedTokens[_from].length--;
    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: contracts/openzeppelin-solidity/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 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: contracts/ERC721TokenWithData.sol

// import "./ERC721SlimTokenArray.sol";



// an ERC721 token with additional data storage,
contract ERC721TokenWithData is ERC721Token("CryptoAssaultUnit", "CAU"), Ownable {

  /**
   * @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 ||
			approvedContractAddresses[_spender] ||
			getApproved(_tokenId) == _spender ||
			isApprovedForAll(owner, _spender)
		);
	}

	mapping (address => bool) internal approvedContractAddresses;
	bool approvedContractsFinalized = false;

	/**
	* @notice Approve a contract address for minting tokens and transferring tokens, when approved by the owner
	* @param contractAddress The address that will be approved
	*/
	function addApprovedContractAddress(address contractAddress) public onlyOwner
	{
		require(!approvedContractsFinalized);
		approvedContractAddresses[contractAddress] = true;
	}

	/**
	* @notice Unapprove a contract address for minting tokens and transferring tokens
	* @param contractAddress The address that will be unapproved
	*/
	function removeApprovedContractAddress(address contractAddress) public onlyOwner
	{
		require(!approvedContractsFinalized);
		approvedContractAddresses[contractAddress] = false;
	}

	/**
	* @notice Finalize the contract so it will be forever impossible to change the approved contracts list
	*/
	function finalizeApprovedContracts() public onlyOwner {
		approvedContractsFinalized = true;
	}

	mapping(uint256 => mapping(uint256 => uint256)) data;

	function getData(uint256 _tokenId, uint256 _index) public view returns (uint256) {
		return data[_index][_tokenId];
	}

	function getData3(uint256 _tokenId1, uint256 _tokenId2, uint256 _tokenId3, uint256 _index) public view returns (uint256, uint256, uint256) {
		return (
			data[_index][_tokenId1],
			data[_index][_tokenId2],
			data[_index][_tokenId3]
		);
	}
	
	function getDataAndOwner3(uint256 _tokenId1, uint256 _tokenId2, uint256 _tokenId3, uint256 _index) public view returns (uint256, uint256, uint256, address, address, address) {
		return (
			data[_index][_tokenId1],
			data[_index][_tokenId2],
			data[_index][_tokenId3],
			ownerOf(_tokenId1),
			ownerOf(_tokenId2),
			ownerOf(_tokenId3)
		);
	}
	
	function _setData(uint256 _tokenId, uint256 _index, uint256 _data) internal {
		
		data[_index][_tokenId] = _data;
	}

	function setData(uint256 _tokenId, uint256 _index, uint256 _data) public {
		
		require(approvedContractAddresses[msg.sender], "not an approved sender");
		data[_index][_tokenId] = _data;
	}

	/**
	* @notice Gets the list of tokens owned by a given address
	* @param _owner address to query the tokens of
	* @return uint256[] representing the list of tokens owned by the passed address
	*/
	function tokensOfWithData(address _owner, uint256 _index) public view returns (uint256[], uint256[]) {
		uint256[] memory tokensList = ownedTokens[_owner];
		uint256[] memory dataList = new uint256[](tokensList.length);
		for (uint i=0; i<tokensList.length; i++) {
			dataList[i] = data[_index][tokensList[i]];
		}
		return (tokensList, dataList);
	}

	// The tokenId of the next minted token. It auto-increments.
	uint256 nextTokenId = 1;

	function getNextTokenId() public view returns (uint256) {
		return nextTokenId;
	}

	/**
	* @notice Mint token function
	* @param _to The address that will own the minted token
	*/
	function mintAndSetData(address _to, uint256 _data) public returns (uint256) {

		require(approvedContractAddresses[msg.sender], "not an approved sender");

		uint256 tokenId = nextTokenId;
		nextTokenId++;
		_mint(_to, tokenId);
		_setData(tokenId, 0, _data);

		return tokenId;
	}

	function burn(uint256 _tokenId) public {
		require(
			approvedContractAddresses[msg.sender] ||
			msg.sender == owner, "burner not approved"
		);

		_burn(ownerOf(_tokenId), _tokenId);
	}
	
	function burn3(uint256 _tokenId1, uint256 _tokenId2, uint256 _tokenId3) public {
		require(
			approvedContractAddresses[msg.sender] ||
			msg.sender == owner, "burner not approved"
		);

		_burn(ownerOf(_tokenId1), _tokenId1);
		_burn(ownerOf(_tokenId2), _tokenId2);
		_burn(ownerOf(_tokenId3), _tokenId3);
	}
}

// File: contracts/strings/Strings.sol

library Strings {
  // via https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
  function strConcat(string _a, string _b, string _c, string _d, string _e) internal pure returns (string) {
      bytes memory _ba = bytes(_a);
      bytes memory _bb = bytes(_b);
      bytes memory _bc = bytes(_c);
      bytes memory _bd = bytes(_d);
      bytes memory _be = bytes(_e);
      string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
      bytes memory babcde = bytes(abcde);
      uint k = 0;
      for (uint i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
      for (i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
      for (i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
      for (i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
      for (i = 0; i < _be.length; i++) babcde[k++] = _be[i];
      return string(babcde);
    }

    function strConcat(string _a, string _b, string _c, string _d) internal pure returns (string) {
        return strConcat(_a, _b, _c, _d, "");
    }

    function strConcat(string _a, string _b, string _c) internal pure returns (string) {
        return strConcat(_a, _b, _c, "", "");
    }

    function strConcat(string _a, string _b) internal pure returns (string) {
        return strConcat(_a, _b, "", "", "");
    }

    function uint2str(uint i) internal pure returns (string) {
        if (i == 0) return "0";
        uint j = i;
        uint len;
        while (j != 0){
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (i != 0){
            bstr[k--] = byte(48 + i % 10);
            i /= 10;
        }
        return string(bstr);
    }
}

// File: contracts/Token.sol

contract Token is ERC721TokenWithData {

	string metadataUrlPrefix = "https://metadata.cryptoassault.io/unit/";

	/**
	* @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 Strings.strConcat(metadataUrlPrefix, Strings.uint2str(_tokenId));
	}

	function setMetadataUrlPrefix(string _metadataUrlPrefix) public onlyOwner
	{
		metadataUrlPrefix = _metadataUrlPrefix;
	}
}

Contract Security Audit

Contract ABI

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"},{"name":"_tokenId2","type":"uint256"},{"name":"_tokenId3","type":"uint256"},{"name":"_index","type":"uint256"}],"name":"getData3","outputs":[{"name":"","type":"uint256"},{"name":"","type":"uint256"},{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_tokenId1","type":"uint256"},{"name":"_tokenId2","type":"uint256"},{"name":"_tokenId3","type":"uint256"}],"name":"burn3","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_tokenId","type":"uint256"},{"name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getNextTokenId","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"contractAddress","type":"address"}],"name":"removeApprovedContractAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_operator","type":"address"}],"name":"isApprovedForAll","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"},{"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"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":true,"name":"_tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_approved","type":"address"},{"indexed":true,"name":"_tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_operator","type":"address"},{"indexed":false,"name":"_approved","type":"bool"}],"name":"ApprovalForAll","type":"event"}]

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Swarm Source

bzzr://53cf7e4a40c71eafcfafe842d775adc548fe95cfe1714618d5b1c1c871b80a37
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