Token

GU Collectable (TRINKET)

Feature Tip: Add private address tag to any address under My Name Tag !

ERC-721

NFT

Overview

Max Total Supply

10,273 TRINKET

Holders

2,590

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A

Other Info

Token Contract

0xa5e5be69c923c701ae6ac8f1f5936af3ae610c68

Filtered by Token Holder

0x6954d0255cfeD71d55Ad8b371b4170B8BF7709dC

hwacch.eth

Balance

3 TRINKET

0x6954d0255cfeD71d55Ad8b371b4170B8BF7709dC

OVERVIEW

Unique and tradable talismans that represent CryptoKitties as statues in the Gods Unchained universe. Buy and sell these unique collectibles on the OpenSea marketplace. With the introduction of Trinkets to the game, the Loadout selection now has the ability to add two trinkets to a board.

#	Exchange	Pair	Price	24H Volume	% Volume

Contract Source Code Verified (Exact Match)

Contract Name:

Collectables

Compiler Version

v0.4.24+commit.e67f0147

Optimization Enabled:

Yes with 200 runs

Other Settings:

default evmVersion

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2018-12-10
*/

pragma solidity ^0.4.24;

library Address {

  /**
   * 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;
    }

}

contract Ownable {

    address public owner;

    constructor() public {
        owner = msg.sender;
    }

    function setOwner(address _owner) public onlyOwner {
        owner = _owner;
    }

    function getOwner() public view returns (address) {
        return owner;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

}

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;
    }
}

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);
    }
}

interface IERC165 {

  /**
   * @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);
  
}

contract IERC721Receiver {
    /**
    * @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 memory _data
    )
        public
        returns(bytes4);
}

contract IERC721Holder is IERC721Receiver {

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

}

contract IERC721 is IERC165 {

    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 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 memory data) public;

}

contract IERC721Enumerable is IERC721 {
    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);
}

contract IERC721Metadata is IERC721 {
    function name() external view returns (string memory _name);
    function symbol() external view returns (string memory _symbol);
    function tokenURI(uint256 _tokenId) public view returns (string memory);
}

contract SupportsInterfaceWithLookup is IERC165 {
    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 Delegate {

    function mint(address _sender, address _to) public returns (bool);

    function approve(address _sender, address _to, uint256 _tokenId) public returns (bool);

    function setApprovalForAll(address _sender, address _operator, bool _approved) public returns (bool);

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

    function safeTransferFrom(address _sender, address _from, address _to, uint256 _tokenId, bytes memory _data) public returns (bool);

}

/**
 * @title ERC165
 * @author Matt Condon (@shrugs)
 * @dev Implements ERC165 using a lookup table.
 */
contract ERC165 is IERC165 {

    bytes4 private 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) private _supportedInterfaces;

    /**
    * @dev A contract implementing SupportsInterfaceWithLookup
    * implement ERC165 itself
    */
    constructor()
      internal
    {
        _registerInterface(_InterfaceId_ERC165);
    }

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

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

contract ERC721 is ERC165, IERC721 {

    using SafeMath for uint256;
    using Address for address;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from token ID to owner
    mapping (uint256 => address) private _tokenOwner;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

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

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    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)'))
    */

    constructor()
        public
    {
        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_InterfaceId_ERC721);
    }

    /**
    * @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 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
    * Reverts if the token ID does not exist.
    * @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) {
        require(_exists(tokenId));
        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
    {
        require(_isApprovedOrOwner(msg.sender, tokenId));
        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
    {
        // 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 memory _data
    )
        public
    {
        transferFrom(from, to, tokenId);
        // solium-disable-next-line arg-overflow
        require(_checkAndCallSafeTransfer(from, to, tokenId, _data));
    }

    /**
    * @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) internal view returns (bool) {
        address owner = _tokenOwner[tokenId];
        return owner != address(0);
    }

    /**
    * @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 memory _data
    )
        internal
        returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }
        bytes4 retval = IERC721Receiver(to).onERC721Received(
        msg.sender, from, tokenId, _data);
        return (retval == _ERC721_RECEIVED);
    }
}

contract ERC721Enumerable is ERC165, ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => uint256[]) private _ownedTokens;

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

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

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

    bytes4 private constant _InterfaceId_ERC721Enumerable = 0x780e9d63;
    /**
    * 0x780e9d63 ===
    *   bytes4(keccak256('totalSupply()')) ^
    *   bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
    *   bytes4(keccak256('tokenByIndex(uint256)'))
    */

    /**
    * @dev Constructor function
    */
    constructor() public {
        // register the supported interface to conform to ERC721 via ERC165
        _registerInterface(_InterfaceId_ERC721Enumerable);
    }

    /**
    * @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 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);

        // 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;
    }
}


contract ERC721Metadata is ERC165, ERC721, IERC721Metadata {
    // Token name
    string internal _name;

    // Token symbol
    string internal _symbol;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

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

    /**
    * @dev Constructor function
    */
    constructor(string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;

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

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

    /**
    * @dev Gets the token symbol
    * @return string representing the token symbol
    */
    function symbol() external view returns (string memory) {
        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 memory) {
        require(_exists(tokenId));
        return _tokenURIs[tokenId];
    }

    /**
    * @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 memory uri) internal {
        require(_exists(tokenId));
        _tokenURIs[tokenId] = uri;
    }

    /**
    * @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];
        }
    }
}

contract ERC721Full is ERC721, ERC721Enumerable, ERC721Metadata {
  
    constructor(string memory name, string memory symbol) ERC721Metadata(name, symbol) public {

    }

}

contract Collectables is ERC721Full("GU Collectable", "TRINKET"), Ownable {

    using Strings for string;

    // delegate item specific storage/logic to other contracts
    // one main contract manages transfers etc
    mapping(uint32 => address) public delegates;

    // use uint32s instead of addresses to reduce the storage size needed
    // individual token properties should be stored in the delegate contract
    uint32[] public collectables;
    uint public delegateCount;

    event DelegateAdded(address indexed delegate, uint32 indexed delegateID);

    function addDelegate(address delegate) public onlyOwner {
        uint32 delegateID = uint32(delegateCount++);
        // should never happen, but check anyway
        require(delegates[delegateID] == address(0), "delegate is already set for collectable type");
        delegates[delegateID] = delegate;
        emit DelegateAdded(delegate, delegateID);
    }

    function mint(uint32 delegateID, address to) public returns (uint) {
        Delegate delegate = getDelegate(delegateID);
        require(delegate.mint(msg.sender, to), "delegate could not mint token");
        uint id = collectables.push(delegateID) - 1;
        super._mint(to, id);
        return id;
    }

    function transferFrom(address from, address to, uint256 tokenId) public {
        Delegate delegate = getTokenDelegate(tokenId);
        require(delegate.transferFrom(msg.sender, from, to, tokenId), "could not transfer token");
        super.transferFrom(from, to, tokenId);
    }

    function approve(address to, uint256 tokenId) public {
        Delegate delegate = getTokenDelegate(tokenId);
        require(delegate.approve(msg.sender, to, tokenId), "could not approve token");
        super.approve(to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes data) public {
        Delegate delegate = getTokenDelegate(tokenId);
        require(delegate.safeTransferFrom(msg.sender, from, to, tokenId, data), "could not safe transfer token");
        super.safeTransferFrom(from, to, tokenId, data);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public {
        Delegate delegate = getTokenDelegate(tokenId);
        require(delegate.safeTransferFrom(msg.sender, from, to, tokenId), "could not safe transfer token");
        super.safeTransferFrom(from, to, tokenId);
    }

    function getTokenDelegate(uint id) public view returns (Delegate) {
        address d = delegates[collectables[id]];
        require(d != address(0), "invalid delegate");
        return Delegate(d);
    }

    function getDelegate(uint32 id) public view returns (Delegate) {
        address d = delegates[id];
        require(d != address(0), "invalid delegate");
        return Delegate(d);
    }

    string public constant tokenMetadataBaseURI = "https://api.godsunchained.com/collectable/";

    function tokenURI(uint256 _tokenId) public view returns (string memory) {
        require(_exists(_tokenId), "token doesn't exist");
        return Strings.strConcat(
            tokenMetadataBaseURI,
            Strings.uint2str(_tokenId)
        );
    }

    

}

Contract Security Audit

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Contract ABI

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ous":false,"inputs":[{"indexed":true,"name":"delegate","type":"address"},{"indexed":true,"name":"delegateID","type":"uint32"}],"name":"DelegateAdded","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"}]

Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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Swarm Source

bzzr://bb77250f1b193c2c2881b211d44761d8730de431f3d31d93d59d8b1055c94fe0

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