Contract 0xdb55584E5104505a6b38776eE4dCBa7dD6bB25FE 5

 
Txn Hash
Method
Block
From
To
Value
0x345ced2152749e8946805bcd9f522e8afce06500f7394387b8fb7c92e119951bSafe Transfer Fr...156415132022-09-29 20:54:351 day 58 mins ago0xf90fba80c35834eb19f7714b414328d946b60e50 IN  Visitors of Imma Degen: VOID Token0 Ether0.00068023 12.05606595
0x44d5c86a4157817cb95f2b82027d4c03cece3f0d9d6147c631329207a2310a09Safe Transfer Fr...156415122022-09-29 20:54:231 day 59 mins ago0xf90fba80c35834eb19f7714b414328d946b60e50 IN  Visitors of Imma Degen: VOID Token0 Ether0.00076906 11.64843029
0xa8f95fd01c723bb5aea19bcb332f2fa62f71e5e4576dec6260fa4705d88dbec2Safe Transfer Fr...156415102022-09-29 20:53:591 day 59 mins ago0xf90fba80c35834eb19f7714b414328d946b60e50 IN  Visitors of Imma Degen: VOID Token0 Ether0.00085107 12.89063646
0xb52a0e0543d17b197fec8e00c36b0ad00b00ef64adb5a8a75551d78ff338cb49Safe Transfer Fr...156415082022-09-29 20:53:351 day 59 mins ago0xf90fba80c35834eb19f7714b414328d946b60e50 IN  Visitors of Imma Degen: VOID Token0 Ether0.00132532 13.22378532
0x1850c8334ce87ebf0659d2279deca3d14acf7a6f4537443d4614cc1506131f78Set Approval For...156413212022-09-29 20:16:111 day 1 hr agoENS Name ceofund.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.0028681861.35545449
0x32aa100aae32eb8255f00b4319556f67f115d55ddefca1bf36638a216c311ba9Set Approval For...156409802022-09-29 19:07:231 day 2 hrs agoENS Name goodknight21.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.00070918 15.19810011
0x1d7198f8e373f65ef948d352159ccc0edea026ff0545bc8635e0d1b470121d12Set Approval For...156367872022-09-29 5:02:351 day 16 hrs agoENS Name oregonguy.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.00050447 10.7916849
0x261897de4233d0e02a65c540215f80fd432078caec4b656fd937cc9247475fd5Set Approval For...156339192022-09-28 19:26:352 days 2 hrs agoENS Name bubby.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.00092559 19.83565833
0xff431ab11ae63ec431b5696959df94ce3fcd958a6242cc1213b6f6a1751d9908Set Approval For...156337122022-09-28 18:44:592 days 3 hrs ago0x592c6c12c6cf71722880b9263e93b35ff7952cc2 IN  Visitors of Imma Degen: VOID Token0 Ether0.0014528 31.13402384
0x11cdcb9b25d64030eb39d5351e49bb777be8fe73868ffefe0e7159dd1e4fe0b1Set Approval For...156316002022-09-28 11:40:472 days 10 hrs ago0x0d5d78824ac6df081897585509aa23abda430722 IN  Visitors of Imma Degen: VOID Token0 Ether0.00047471 10.1731794
0xe615e8a6bec76d868581ffc05e1d64e0dc06402533a0b5c8a086f67588a4bf5dSafe Transfer Fr...156301152022-09-28 6:42:472 days 15 hrs ago0x243fba167c5c649611116aac602da37cc9e71100 IN  Visitors of Imma Degen: VOID Token0 Ether0.00100908 10.11441807
0x2075e41f58244465ee1367a4620bb64fdf8193ca0c788c0fac63f0a31c2c0b86Set Approval For...156259562022-09-27 16:43:113 days 5 hrs agoENS Name extramoist.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.00238953 51.20838012
0x8295a7bdabb1041b792b76f1c45517567901b830fb80dfa9f05a7dbafeb5525cSet Approval For...156204882022-09-26 22:22:233 days 23 hrs ago0xdbba216c43d719f90db6ce114d67df0df65f9967 IN  Visitors of Imma Degen: VOID Token0 Ether0.00056844 12.18188125
0x6a02621bad5545bfc89f77cfa446b7f97c9fbea2ab39f4a3a25d9ed9a3f231e7Safe Transfer Fr...156196032022-09-26 19:23:594 days 2 hrs agoENS Name merakii.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.00149987 15.03193201
0x41e5a8f5b716ac12d5d776b8850576d37f4aab9e83118405281c6c98c46a06ffSet Approval For...156147682022-09-26 3:09:354 days 18 hrs agoSpottie WiFi: Deployer IN  Visitors of Imma Degen: VOID Token0 Ether0.00013796 5.55531176
0x6e63a4e2448132ce83057ec8c1b4d7af22bd7dd18d1c696e4df1580671321469Safe Transfer Fr...156135292022-09-25 22:59:594 days 22 hrs ago0xcb5d32737c78537e27da7bbe0f475c8694b8aa13 IN  Visitors of Imma Degen: VOID Token0 Ether0.00051744 5.73872208
0x03906e2d25d0f3304e06708da01dfa2afe886ef79825b8beb9fd4d981928fad5Set Approval For...156130162022-09-25 21:16:355 days 36 mins agoENS Name elby.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.0005037 10.79452471
0x35aaf2d8ad8f7d564335fa9b2c7dbda59a1a447c154c38ededff0136702f8f64Set Approval For...156109362022-09-25 14:18:235 days 7 hrs ago0x46b2bd5c888e6d57a839c559fd6076f2c15a8cb1 IN  Visitors of Imma Degen: VOID Token0 Ether0.0002059 7.69692428
0x379d09b9c6855a4c6858179ee2aca3122ce2ddfef1932994d0971c2a6b8c3feeSet Approval For...156094992022-09-25 9:29:595 days 12 hrs agoENS Name ajslays.eth IN  Visitors of Imma Degen: VOID Token0 Ether0.00012173 4.90178134
0x5b04bb84454140688c5146b15ba178dc58f908218a4bdeb5656feeefefb688d8Safe Transfer Fr...156092842022-09-25 8:46:475 days 13 hrs ago0xa617b92c112e856b00199de07607260658bfae28 IN  Visitors of Imma Degen: VOID Token0 Ether0.00048168 5.34217329
0x4e8818ac1040371916964cebbedf18f0d317d950aa34d211395e11bd4e76a568Set Approval For...156069412022-09-25 0:56:475 days 20 hrs ago0x46b2bd5c888e6d57a839c559fd6076f2c15a8cb1 IN  Visitors of Imma Degen: VOID Token0 Ether0.00007487 3.02501991
0x1fce1eb1b5da5502fd963dac447f8a8ae28bde13f2b879240c2ce5f5d54dd0d2Set Approval For...156064072022-09-24 23:09:355 days 22 hrs ago0xbee2cd03d5c21d8a2da25a68e7aa9e09f95a9537 IN  Visitors of Imma Degen: VOID Token0 Ether0.00017452 3.74021192
0xa8e158d3145bfe2026fb221cedc13fe008b9eb59de8d9787f97533440e8b6fd2Set Approval For...156045122022-09-24 16:47:476 days 5 hrs ago0xa617b92c112e856b00199de07607260658bfae28 IN  Visitors of Imma Degen: VOID Token0 Ether0.00027437 5.87996086
0xc5a0bb983076b2eb6152d428b3a4b579003bb5c2146f0cddd957dcfcb5798165Set Approval For...156043452022-09-24 16:14:236 days 5 hrs ago0x1cfe136238aa20db58d828a099a4bbe5b8dca7e7 IN  Visitors of Imma Degen: VOID Token0 Ether0.00036745 7.87464802
0x840a10a30fa9d2be261d2d9b72e6179fc64c31760d73907de6fdd7701da1b36cSet Approval For...156040382022-09-24 15:12:476 days 6 hrs ago0xb42e42c80f6af7b6afd8877f4853f0bbc0eb3a43 IN  Visitors of Imma Degen: VOID Token0 Ether0.00029476 6.30560255
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OVERVIEW

ATTENTION EARTHLINGS! THE VISITORS OF IMMA DEGEN ARE AMONG US! 9,999 VISITORS HAVE CRASH-LANDED ON EARTH, AND THEY ARE TRYING TO BLEND IN USING THE ONLY KNOWLEDGE THEY HAVE OF OUR PLANET: SATELLITE BROADCAST TELEVISION!

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x2740a6413be1396d4c7f43d7a6f8369b22f2ed2faa4c65d67d6f4cf771ea1436154875622022-09-07 1:50:2123 days 20 hrs ago Coinbase 10 Visitors of Imma Degen: VOID Token0.00195777 Ether
0xdbcb213347bcf851388074e3af9f1c29881c08b85639ed79a643cd0f579ec571127578232021-07-04 0:24:10453 days 21 hrs ago Visitors of Imma Degen: VOID TokenENS Name roky.eth39.056 Ether
0xdbcb213347bcf851388074e3af9f1c29881c08b85639ed79a643cd0f579ec571127578232021-07-04 0:24:10453 days 21 hrs ago Visitors of Imma Degen: VOID Token0x46674cafc304949787c3ae11103cb9b834faaef739.056 Ether
0xdbcb213347bcf851388074e3af9f1c29881c08b85639ed79a643cd0f579ec571127578232021-07-04 0:24:10453 days 21 hrs ago Visitors of Imma Degen: VOID Token0x7e145b6b4100188bf8fbc989afeb17ace813444639.056 Ether
0xdbcb213347bcf851388074e3af9f1c29881c08b85639ed79a643cd0f579ec571127578232021-07-04 0:24:10453 days 21 hrs ago Visitors of Imma Degen: VOID Token0x23a8b7f4cf5fb0d40aa7db57b8cd376d3332130e78.112 Ether
0x9cb61554b5c558e940142c419660e94a9d0e0b17b44f17d8f3e4b3a373fb12e5127571002021-07-03 21:42:55454 days 10 mins ago Visitors of Imma Degen: VOID TokenENS Name roky.eth25.52 Ether
0x9cb61554b5c558e940142c419660e94a9d0e0b17b44f17d8f3e4b3a373fb12e5127571002021-07-03 21:42:55454 days 10 mins ago Visitors of Imma Degen: VOID Token0x46674cafc304949787c3ae11103cb9b834faaef725.52 Ether
0x9cb61554b5c558e940142c419660e94a9d0e0b17b44f17d8f3e4b3a373fb12e5127571002021-07-03 21:42:55454 days 10 mins ago Visitors of Imma Degen: VOID Token0x7e145b6b4100188bf8fbc989afeb17ace813444625.52 Ether
0x9cb61554b5c558e940142c419660e94a9d0e0b17b44f17d8f3e4b3a373fb12e5127571002021-07-03 21:42:55454 days 10 mins ago Visitors of Imma Degen: VOID Token0x23a8b7f4cf5fb0d40aa7db57b8cd376d3332130e51.04 Ether
0xd74d80a5ed318e111a4ca2cf953e37614a35646fb8e94f4667b01779d2803e44127558382021-07-03 17:05:13454 days 4 hrs ago Visitors of Imma Degen: VOID TokenENS Name roky.eth23.632 Ether
0xd74d80a5ed318e111a4ca2cf953e37614a35646fb8e94f4667b01779d2803e44127558382021-07-03 17:05:13454 days 4 hrs ago Visitors of Imma Degen: VOID Token0x46674cafc304949787c3ae11103cb9b834faaef723.632 Ether
0xd74d80a5ed318e111a4ca2cf953e37614a35646fb8e94f4667b01779d2803e44127558382021-07-03 17:05:13454 days 4 hrs ago Visitors of Imma Degen: VOID Token0x7e145b6b4100188bf8fbc989afeb17ace813444623.632 Ether
0xd74d80a5ed318e111a4ca2cf953e37614a35646fb8e94f4667b01779d2803e44127558382021-07-03 17:05:13454 days 4 hrs ago Visitors of Imma Degen: VOID Token0x23a8b7f4cf5fb0d40aa7db57b8cd376d3332130e47.264 Ether
0x096ef42d02d5cf44b987505559bf08954775bc870a30a96499ba2cef325f931b127531032021-07-03 6:49:03454 days 15 hrs ago Visitors of Imma Degen: VOID TokenENS Name roky.eth15.392 Ether
0x096ef42d02d5cf44b987505559bf08954775bc870a30a96499ba2cef325f931b127531032021-07-03 6:49:03454 days 15 hrs ago Visitors of Imma Degen: VOID Token0x46674cafc304949787c3ae11103cb9b834faaef715.392 Ether
0x096ef42d02d5cf44b987505559bf08954775bc870a30a96499ba2cef325f931b127531032021-07-03 6:49:03454 days 15 hrs ago Visitors of Imma Degen: VOID Token0x7e145b6b4100188bf8fbc989afeb17ace813444615.392 Ether
0x096ef42d02d5cf44b987505559bf08954775bc870a30a96499ba2cef325f931b127531032021-07-03 6:49:03454 days 15 hrs ago Visitors of Imma Degen: VOID Token0x23a8b7f4cf5fb0d40aa7db57b8cd376d3332130e30.784 Ether
0x8442bb8c35d23e7b753b6c225cfbc689ccba38fb25f2ca603294f94bd74261a1127514832021-07-03 0:42:15454 days 21 hrs ago Visitors of Imma Degen: VOID TokenENS Name roky.eth8.192 Ether
0x8442bb8c35d23e7b753b6c225cfbc689ccba38fb25f2ca603294f94bd74261a1127514832021-07-03 0:42:15454 days 21 hrs ago Visitors of Imma Degen: VOID Token0x46674cafc304949787c3ae11103cb9b834faaef78.192 Ether
0x8442bb8c35d23e7b753b6c225cfbc689ccba38fb25f2ca603294f94bd74261a1127514832021-07-03 0:42:15454 days 21 hrs ago Visitors of Imma Degen: VOID Token0x7e145b6b4100188bf8fbc989afeb17ace81344468.192 Ether
0x8442bb8c35d23e7b753b6c225cfbc689ccba38fb25f2ca603294f94bd74261a1127514832021-07-03 0:42:15454 days 21 hrs ago Visitors of Imma Degen: VOID Token0x23a8b7f4cf5fb0d40aa7db57b8cd376d3332130e16.384 Ether
0x5042fcd893049eb936de38dfbee75fd0810e14b6d760f097e1167aaa714ca441127501432021-07-02 19:44:10455 days 2 hrs ago Visitors of Imma Degen: VOID TokenENS Name roky.eth48.172 Ether
0x5042fcd893049eb936de38dfbee75fd0810e14b6d760f097e1167aaa714ca441127501432021-07-02 19:44:10455 days 2 hrs ago Visitors of Imma Degen: VOID Token0x46674cafc304949787c3ae11103cb9b834faaef748.172 Ether
0x5042fcd893049eb936de38dfbee75fd0810e14b6d760f097e1167aaa714ca441127501432021-07-02 19:44:10455 days 2 hrs ago Visitors of Imma Degen: VOID Token0x7e145b6b4100188bf8fbc989afeb17ace813444648.172 Ether
0x5042fcd893049eb936de38dfbee75fd0810e14b6d760f097e1167aaa714ca441127501432021-07-02 19:44:10455 days 2 hrs ago Visitors of Imma Degen: VOID Token0x23a8b7f4cf5fb0d40aa7db57b8cd376d3332130e96.344 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
ContractNFT

Compiler Version
v0.8.0+commit.c7dfd78e

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 13 : ContractNFT.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.19 <0.8.5;
import "./Factory.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

contract ContractNFT is Factory, ERC721 { 

    using SafeMath for uint256;
    event AssetsMinted(address owner);
    mapping(uint256 => uint256) private _totalSupply;

    constructor() ERC721("Visitors of Imma Degen", "VOID") {
        contractOnwers.push(ContractOwners(payable(address(0x23A8b7F4cf5FB0D40Aa7DB57b8cd376d3332130e)), 40));
        contractOnwers.push(ContractOwners(payable(address(0x7E145B6B4100188bf8FBC989Afeb17aCe8134446)), 20));
        contractOnwers.push(ContractOwners(payable(address(0x46674Cafc304949787c3ae11103CB9B834FaAEF7)), 20));
        contractOnwers.push(ContractOwners(payable(address(0xBcdc5969Ec1652Bf80fc15edFE50f9834a55067b)), 20));
    }

    modifier canBuy(uint _qty){
        require(msg.value == (assetPrice * _qty));
        _;
    }

    modifier canCreate() {
        require(assets.length < 9999);
        _;
    }

    modifier canWithdraw(){
        require(address(this).balance > 0.2 ether);
        _;
    }

    struct ContractOwners {
        address payable addr;
        uint percent;
    }

    ContractOwners[] contractOnwers;

    uint assetPrice = 0.08 ether;

    function withdraw() external payable onlyOwner() canWithdraw() {
        uint nbalance = address(this).balance - 0.1 ether;
        for(uint i = 0; i < contractOnwers.length; i++){
            ContractOwners storage o = contractOnwers[i];
            o.addr.transfer((nbalance * o.percent) / 100);       
        }
        
    }

    function balance() external view onlyOwner returns (uint)  {
        return address(this).balance;
    }

    function setAssetPrice(uint _fee) external onlyOwner {
        assetPrice = _fee;
    }

    function getAssetPrice() external view returns (uint){
        return assetPrice;
    }

    function getAssetsIdsByOwner(address _owner) external view returns(uint[] memory) {
        uint[] memory result = new uint[](ownerAssetCount[_owner]);
        uint counter = 0;
        for (uint i = 0; i < assets.length; i++) {
            if (assetToOwner[i] == _owner) {
                result[counter] = i;
                counter++;
            }
        }
        return result;
    }

    function getAssetsCount() external view returns(uint){
        return assets.length;
    }

    function buyAssets(uint _qty) external payable canBuy(_qty) {
        require(_qty <= 20, "max 20 visitors at once");
        uint i = 0;
        while(i < _qty){
            mintAsset();
            i++;
        }
        emit AssetsMinted(msg.sender);
    }

    function setBaseTokenURI(string calldata _uri) external onlyOwner {
        baseTokenURI = _uri;
    }

    function _baseURI() internal override view returns (string memory) {
        return baseTokenURI;
    }

    function _beforeTokenTransfer(address _from, address _to, uint256 _tokenId) internal override {
        if(address(0) != _from){
            ownerAssetCount[_to] = ownerAssetCount[_to].add(1);
        } 
        if(_to != assetToOwner[_tokenId]){
            ownerAssetCount[_from] = ownerAssetCount[_from].sub(1);
            assetToOwner[_tokenId] = _to;
        }
        
    }
    
    function mintAsset() internal canCreate() {
        Asset memory asset = Asset(assets.length + 1);
        assets.push(asset);
        uint id = assets.length;
        assetToOwner[id] = msg.sender;
        ownerAssetCount[msg.sender] = ownerAssetCount[msg.sender].add(1);
        _mint(msg.sender, id);
    }

}

File 2 of 13 : Factory.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.21 <0.8.5;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract Factory is Ownable { 

    using SafeMath for uint256;

    struct Asset {
        uint256 assetId;
    }

    Asset[] public assets;
    string internal baseTokenURI = 'https://immadegenbackend.herokuapp.com/';

    mapping (uint256 => address) public assetToOwner;
    mapping (address => uint256) ownerAssetCount;

    modifier onlyOwnerOf(uint _assetId) {
        require(msg.sender == assetToOwner[_assetId]);
        _;
    }
}

File 3 of 13 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 4 of 13 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

    // Mapping owner address to token count
    mapping (address => uint256) private _balances;

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

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

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC721).interfaceId
            || interfaceId == type(IERC721Metadata).interfaceId
            || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0
            ? string(abi.encodePacked(baseURI, tokenId.toString()))
            : '';
    }

    /**
     * @dev Base URI for computing {tokenURI}. Empty by default, can be overriden
     * in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        _mint(to, tokenId);
        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-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 bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}

File 5 of 13 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
      * - `from` cannot be the zero address.
      * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

File 6 of 13 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

File 7 of 13 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 8 of 13 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 9 of 13 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 10 of 13 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant alphabet = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = alphabet[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

}

File 11 of 13 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 12 of 13 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 13 of 13 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"owner","type":"address"}],"name":"AssetsMinted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"assetToOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"assets","outputs":[{"internalType":"uint256","name":"assetId","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_qty","type":"uint256"}],"name":"buyAssets","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAssetPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAssetsCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"getAssetsIdsByOwner","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_fee","type":"uint256"}],"name":"setAssetPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_uri","type":"string"}],"name":"setBaseTokenURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"payable","type":"function"}]

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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.