Contract 0x197FC873B3E498b7cA8faC410f466515ceeC600B 3

 
Txn Hash
Method
Block
From
To
Value
0xff821a4fe6f3388d5555146c7ce27924407adfbd7af0463b687066b2ec925e43Set Approval For...153073572022-08-09 10:01:301 day 13 hrs ago0xe7245df8500f3759e32859fbb0056bec4eba87d3 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00081226 17.61766033
0x112a4c9e55c1454bf291a3f4a9db73241dfc12eb1a971f0dff591c77b6c48e6dSet Approval For...152959402022-08-07 15:18:073 days 8 hrs ago0x98a5455f04a69d589e9a7045bd107067db9d29e2 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00038268 8.30024689
0xbd0fbf9fe65bdf038e500da3bf634a7df48c673d395d4d1498f4d6140f3e42b7Set Approval For...152944782022-08-07 9:57:543 days 13 hrs ago0x27db050a9bffc75d3209e7c27d780a84ab15a13e IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00029359 6.35640073
0x5b4fc8496b8207df6d7258f206c90327bbc5ec755199bddf60fa3164152d45b9Set Approval For...152940902022-08-07 8:28:223 days 15 hrs ago0x1d29282bd74cf65866c9c9d80bca1819609ad10d IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00034015 7.37793493
0xdc99ce10e04d5840943f4f00a0265dc341e8aa95528903606fe6102897aba440Set Approval For...152900282022-08-06 17:21:104 days 6 hrs ago0xcb206f7c88c6610ba29cc3330a5329765b57c08e IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00083614 18.1357472
0xeb38a6631216c1f6f74b986f71a182198d297acae7f74e4c3e596a899458040bSet Approval For...152852882022-08-05 23:28:065 days 20 mins ago0xb2a0e8ffc16729a0ab621b2de55e1406991b407e IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00070244 15.23585721
0xbe2f9f57b9713be40521b9405cb3a202c196f4bb8c50d79d9adef66e1c5775f4Set Approval For...152838022022-08-05 18:00:365 days 5 hrs ago0x18d0dbc5bbba31782299ce4b83cfe4d6d150f13a IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00059706 12.95018948
0x536bcbcfaff9704a60cf8ca57b0bddfe38f10f0b7c1fd523e1690e45472e0744Safe Transfer Fr...152837692022-08-05 17:54:425 days 5 hrs ago0xdb1b82bc80e84d23726307caababbd4b7d2a037e IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.0022713826
0xd95dfbc8bc0a5192f672a2d94a81d46b3acc9d280e452fb243be5f8ac8f43248Set Approval For...152827032022-08-05 13:51:155 days 9 hrs ago0xe2d70f3254fc0f2f72e933191737d15c4907d6a2 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00071287 15.4619589
0x76c803f21d9df63eb8e8f31fb4467183a50628c7b7d7c4aa49b46e3932cb9c32Transfer From152803192022-08-05 5:02:435 days 18 hrs agoENS Name reecey.eth IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00139845 16.15829221
0x571be5441c6559b00851cacfb1f35a335c680ec04e49bc49bb66cdc3b2706e7eSet Approval For...152798552022-08-05 3:19:245 days 20 hrs agoENS Name sul.eth IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00056801 12.32011219
0x394610ffe2a3844378ee01f40e427b06c9aabf1855ce82eaab1f8335c5b244a4Set Approval For...152772992022-08-04 17:53:146 days 5 hrs ago0x4f8e22d557c3436692e7003d1058cb57ae05804c IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00101525 22.02053161
0x292660a81e73c816ca226cbd089f5e43c4947fe3f98865e9b00ddb7c24ddd3d9Set Approval For...152724622022-08-03 23:36:087 days 12 mins agoENS Name mccullough.eth IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00055704 12.08218293
0xb67723ab594dfd4aa5a92c6be2610861d4900c1fea81582524846e599353b81fSet Approval For...152687782022-08-03 9:45:087 days 14 hrs ago0x5d1ececc0cd2f11206fc41c09e897ac7a42ea3b1 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00051343 11.13624341
0xa62cadca289f95fbb78677ae8aa67093a58d38ee6087f1c4bb104585a0c42b6eSet Approval For...152642512022-08-02 16:48:158 days 6 hrs ago0xbde993dc139a1ab62f8065e5431967e34bd4878a IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00148264 32.15800724
0xfd01ec1c06ab82bc2465f5cac62c1e9088222129955f30caa23e973b9620d4deTransfer From152636552022-08-02 14:28:258 days 9 hrs ago0x422ba8256281d4e72c8f38b923e2fbd2aee54d18 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00109425 12.64352751
0xda0ea603efd94e19516ce721c3cdd9a70645a8c81963b29835a3ed8b85aa5d6dTransfer From152636502022-08-02 14:27:268 days 9 hrs ago0x422ba8256281d4e72c8f38b923e2fbd2aee54d18 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00106311 12.28362437
0x5081daa42044dc0d09e9fcde8aa59b934541cd81edce76af5c7df3f8c36df624Set Approval For...152625452022-08-02 10:27:368 days 13 hrs ago0x2ec6457765e44e86006fe160d222a090e5e423f9 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00036958 8.0161391
0x1c25311c280d6b4413f5dd2d3fae76c33d41c84067086003872a38c4bef5e273Transfer From152620942022-08-02 8:50:448 days 14 hrs ago0x88d59d20705baba097089d9964d6497cb0857b8d IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.0007765 9.27206137
0xfadf503355522c8d02bdfccc4419b66cc0e53a410c35d9081e8c836d02114d3eSet Approval For...152610762022-08-02 4:57:488 days 18 hrs agoENS Name gamblinginspector.eth IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00051175 11.09971698
0xfb649045a0302b90c7f8eb8cb7200331f3b96ac3a485dcc937772a6e94d3ec68Set Approval For...152591872022-08-01 21:52:029 days 1 hr ago0x14d444133aaa3aa6ff4174755e3f3603acdbcc80 IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00039959 16.45983968
0x4883183a8be981dc8c9b17bb4d5b94b382a5b24e9ffd6d2afe98a680cd8bc1afSet Approval For...152581432022-08-01 17:59:059 days 5 hrs ago0x0cf38404f8aee86efab9f6393309c40291b6a7ce IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00088963 19.29593444
0xf020558c069b1058d6db05c63d757dff181ffc9872c28516f1509a070df1b27aSet Approval For...152539512022-08-01 2:33:029 days 21 hrs ago0x09ffc597dba67537c6f50629c79103b186b164aa IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00038553 8.36212377
0xecaa1a46c4188154f0b33ec04f27f10db7122cd7e4ce79f5c609aecc6cd552e3Set Approval For...152466222022-07-30 22:58:2111 days 49 mins agoENS Name cryptowarlord.eth IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00024142 5.23636207
0xf3ec1d7cbb7ceceec004b4dbdc1b793b76c6c57a67bf77b60f3d3bf8a3796deeSet Approval For...152455092022-07-30 18:49:5911 days 4 hrs agoENS Name ikurabomb.eth IN  0x197fc873b3e498b7ca8fac410f466515ceec600b0 Ether0.00043883 9.51816156
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xdc90ab23b7cb67abf9dadced4bcceb133e5a5b01c9b5408eb228ed247d0812c2131686872021-09-05 23:23:55339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0x6ef66a51c8dcebe143567f1c66e342fbe3fd8744d19da157ac795ca162697350131686872021-09-05 23:23:55339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0x473abbf0dec5bfce05b5eed58f1071b2016442485bd9c70236d0c07b405f83ea131686872021-09-05 23:23:55339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.1 Ether
0x9d9a1be7490940954a6fd1f9d36dcd88149da5d42ef6d6a5e64b0ce7adca34c3131686872021-09-05 23:23:55339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.1 Ether
0x35e829cb91045322f358ab1c47bd552e10701a2e45b41ac0d06868d819fb9731131686872021-09-05 23:23:55339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0xc97d691d372554d826f22b9efb157e084e9d0ce3b09bd68c902c294ea80fce48131686872021-09-05 23:23:55339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.15 Ether
0xf5d2c79777a530e029fc45a4031cc5536564aca08491ac629656244107f006ea131686852021-09-05 23:23:26339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.25 Ether
0xa17e3793eb6f027a546c4c900a7cc5aefb7f9ac87db0d596f57c5325885bec37131686852021-09-05 23:23:26339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.25 Ether
0x45b37a581c1c6e14474254b9ea072802bf76f83e2a1675b3b999da1646102b6d131686852021-09-05 23:23:26339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.25 Ether
0xa95cac3c001e94c58be568cf308d53167fb27fe0901a196938c55d8b472b8c46131686852021-09-05 23:23:26339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.15 Ether
0x1857a01d8f50c106c8d3e192c6440b7b8cf8683b22767265ea60658716ba467e131686842021-09-05 23:23:14339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0x482545ec96469937205f4ce7b897cc584248c130090fe66c9dcf0f841d573453131686842021-09-05 23:23:14339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.1 Ether
0x92a07bee28eb0dee3e78a3f0da54b5eb666eb26ff155c495798118e085c645c7131686842021-09-05 23:23:14339 days 24 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.15 Ether
0x156eb3603f140d72db10ad0e3a3b137550f0906c185e2a8316ece36e186eff95131686832021-09-05 23:23:11339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.2 Ether
0x284c29a51ef927414e17b96f1acaeb04ecf8a36d8afafc7cd9583fb96b99c054131686832021-09-05 23:23:11339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.5 Ether
0xcabc361f2f2e857810ef551354d504eafb73008c1f9f1835e6672326a95d27df131686822021-09-05 23:22:59339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0xf052b10b636552cd854241af75c1e3ce6f0e8883b8a8373ac616c3cbf3700666131686822021-09-05 23:22:59339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.25 Ether
0x0a4b3c642094377f7942fa496a38f44219ae96883c9d2558ca997d2a3aaad763131686822021-09-05 23:22:59339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.15 Ether
0xf90a6a79208ff23c09956039add09ae5693af3c2e18073ad837732646ae46254131686822021-09-05 23:22:59339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0xe385bfd165b0ac91a07e7d1e57cb828ff6252da1d76000da0ddb9b7d8598a44e131686822021-09-05 23:22:59339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0x382658d25c24f4a05fe4210022c5f518fe7348bbba135f2dcdf8e3cebf56dcd5131686822021-09-05 23:22:59339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.15 Ether
0x9501524c8d2b127de614547053df74c9a18d6713e375f9a69d86baad009162d8131686812021-09-05 23:22:51339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0x82302dc6cdd1e1dcd9986604351157a866045e12d285eb47991bbde60afb11a5131686812021-09-05 23:22:51339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
0xbf608ca6339da531c1daf17564a65847256df02fcaa52ee194bf7c10407ee0f0131686812021-09-05 23:22:51339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.15 Ether
0x9d2019ba4304c41a88d02f0e956e0246a7b5f61ca24958b4e671220302bd4636131686812021-09-05 23:22:51339 days 25 mins ago 0x197fc873b3e498b7ca8fac410f466515ceec600b0x5aa8ec62658428bb46f9e8adc8fdf8d77329af990.05 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
TSSNFT

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 14 : TSSNFT.sol
pragma solidity ^0.8.0;
// SPDX-License-Identifier: MIT

import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract TSSNFT is ERC721Enumerable, Ownable {
    using SafeMath for uint;
    
    uint public constant MAX_SNEAKERHEADZ = 4444;
    uint public constant MAX_SALE = 20;
    uint public constant MAX_PRESALE = 5;

    address payableAddress;
    uint public price;
    
    mapping(address => uint256) private preSaleAllowance;
    
    bool public hasPreSaleStarted = false;
    bool public preSaleOver = false;
    bool public hasSaleStarted = false;
    
    event SneakerHeadzMinted(uint indexed tokenId, address indexed owner);
    
    constructor() ERC721("The SneakerHeadz Society", "TSS") {

        price = 0.05 ether;
        payableAddress = 0x5Aa8Ec62658428Bb46f9E8aDc8fdf8d77329af99;
    }
    
    function mint(uint _quantity) external payable  {
        require(hasSaleStarted, "Sale hasn't started.");
        require(_quantity > 0, "Quantity cannot be zero.");
        require(_quantity <= MAX_SALE, "Quantity cannot be bigger than MAX_BUYING.");
        require(totalSupply().add(_quantity) <= MAX_SNEAKERHEADZ, "Sold out.");
        require(msg.value >= price.mul(_quantity) || msg.sender == owner(), "Ether value sent is below the price.");
        
        (bool success, ) = payableAddress.call{value:msg.value}("");
        require(success, "Transfer failed.");
        
        for (uint i = 0; i < _quantity; i++) {
            uint mintIndex = totalSupply();
            _safeMint(msg.sender, mintIndex);
            emit SneakerHeadzMinted(mintIndex, msg.sender);
        }
    }
    
    function preMint(uint _quantity) external payable  {
        require(hasPreSaleStarted, "Presale hasn't started.");
        require(!preSaleOver, "Presale is over, no more allowances.");
        require(_quantity > 0, "Quantity cannot be zero.");
        require(_quantity <= MAX_PRESALE, "Quantity cannot be bigger than MAX_PREMINTING.");
        require(preSaleAllowance[msg.sender].sub(_quantity) >= 0, "The user is not allowed to do further presale buyings.");
        require(preSaleAllowance[msg.sender] >= _quantity, "This address is not allowed to buy that quantity.");
        require(totalSupply().add(_quantity) <= MAX_SNEAKERHEADZ, "Sold out");
        require(msg.value >= price.mul(_quantity) || msg.sender == owner(), "Ether value sent is below the price.");
        
        (bool success, ) = payableAddress.call{value:msg.value}("");
        require(success, "Transfer failed.");
        
        preSaleAllowance[msg.sender] = preSaleAllowance[msg.sender].sub(_quantity);
        
        for (uint i = 0; i < _quantity; i++) {
            uint mintIndex = totalSupply();
            _safeMint(msg.sender, mintIndex);
            emit SneakerHeadzMinted(mintIndex, msg.sender);
        }
    }
    
    function mintByOwner(address _to, uint256 _quantity) external onlyOwner {
        require(_quantity > 0, "Quantity cannot be zero.");
        require(_quantity <= MAX_SALE, "Quantity cannot be bigger than MAX_BUYING.");
        require(totalSupply().add(_quantity) <= MAX_SNEAKERHEADZ, "Sold out.");
        
        for (uint i = 0; i < _quantity; i++) {
            uint mintIndex = totalSupply();
            _safeMint(_to, mintIndex);
            emit SneakerHeadzMinted(mintIndex, _to);
        }
    }

    
    function tokensOfOwner(address _owner) public view returns(uint[] memory ) {
        uint tokenCount = balanceOf(_owner);
        if (tokenCount == 0) {
            return new uint[](0);
        } else {
            uint[] memory result = new uint[](tokenCount);
            uint index;
            for (index = 0; index < tokenCount; index++) {
                result[index] = tokenOfOwnerByIndex(_owner, index);
            }
            return result;
        }
    }

    function tokenURI(uint256 _tokenId) public pure override returns (string memory) {
        return string(abi.encodePacked(baseTokenURI(), Strings.toString(_tokenId)));
    }

    function baseTokenURI() public pure returns (string memory) {
        return "https://api.tssnft.com/token/";
    }

    function contractURI() public pure returns (string memory) {
        return "https://api.tssnft.com/contract/nft";
    }
    
    function setPrice(uint _price) external onlyOwner {
        price = _price;
    }
    
    function startSale() external onlyOwner {
        require(!hasSaleStarted, "Sale already active.");
        
        hasSaleStarted = true;
        hasPreSaleStarted = false;
        preSaleOver = true;
    }

    function pauseSale() external onlyOwner {
        require(hasSaleStarted, "Sale is not active.");
        
        hasSaleStarted = false;
    }
    
    function startPreSale() external onlyOwner {
        require(!preSaleOver, "Presale is over, cannot start again.");
        require(!hasPreSaleStarted, "Presale already active.");
        
        hasPreSaleStarted = true;
    }

    function pausePreSale() external onlyOwner {
        require(hasPreSaleStarted, "Presale is not active.");
        
        hasPreSaleStarted = false;
    }

    function setPayableAddress(address _payableAddress) external onlyOwner {
        payableAddress = _payableAddress;
    }
    
    function checkEarlyBird(address earlyBirdAddress) public view returns (uint) {
        return preSaleAllowance[earlyBirdAddress];
    }
    
    
    function addEarlyBirds(address[] memory earlyBirdAddresses) external onlyOwner {
        require(!preSaleOver, "presale is over, no more allowances");
        
        for (uint i = 0; i < earlyBirdAddresses.length; i++) {
            preSaleAllowance[earlyBirdAddresses[i]] = MAX_PRESALE;
        }
    }
}

File 2 of 14 : 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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 3 of 14 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => 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;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @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 override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @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 _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @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 _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 4 of 14 : 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. 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;
        }
    }
}

File 5 of 14 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 6 of 14 : 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}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. 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.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    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` and `to` are never both zero.
     *
     * 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 7 of 14 : 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) {
        return msg.data;
    }
}

File 8 of 14 : 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 9 of 14 : 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 10 of 14 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "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] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

File 11 of 14 : 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;
        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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 12 of 14 : 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 13 of 14 : 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 14 of 14 : 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);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "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":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":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"address","name":"owner","type":"address"}],"name":"SneakerHeadzMinted","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":[],"name":"MAX_PRESALE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_SALE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_SNEAKERHEADZ","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"earlyBirdAddresses","type":"address[]"}],"name":"addEarlyBirds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseTokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"earlyBirdAddress","type":"address"}],"name":"checkEarlyBird","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"hasPreSaleStarted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"hasSaleStarted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"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":[{"internalType":"uint256","name":"_quantity","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_quantity","type":"uint256"}],"name":"mintByOwner","outputs":[],"stateMutability":"nonpayable","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":"pausePreSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"pauseSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_quantity","type":"uint256"}],"name":"preMint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"preSaleOver","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":"address","name":"_payableAddress","type":"address"}],"name":"setPayableAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"setPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startPreSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startSale","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":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"tokensOfOwner","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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"}]

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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.