Contract 0x311965df66a29a0daefdfb3f62ad1f457bebb7a3 1

 

Contract Overview

Balance:
27.387 MATIC

MATIC Value:
$33.66 (@ $1.23/MATIC)

Token:
 
Txn Hash
Method
Block
From
To
Value [Txn Fee]
0x1cc2aee14ab6f6e96b5bb0f64e0ba9fcd81c092f4694647f651f0eb854a883d0Mint Token381678022023-01-16 22:24:5621 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.019771314776 41.381629153
0xa02bfb8b2da5cbd6dbde2e86cad0a969fe6256f81b36061ea83b7900ff855ab6Mint Token381677722023-01-16 22:23:5621 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.020506970087 43.11574659
0xd62aa6c9a546d3c0256681cff6e8a94bc56f4ea82b9681c6ff5cecc32fbdca63Mint Token381677682023-01-16 22:23:4821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.020414141885 43.11574659
0x1f967c3c6ba1a26d9a9fa57f8d002f19d56042101ef7dfd9cdd0a50236e2659aMint Token381677682023-01-16 22:23:4821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.020108795826 42.664937816
0xf9cd152ba8cacfb249155a89da9eef13d6da670ad4976c1e3ed9adc206b21ff8Mint Token381677682023-01-16 22:23:4821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.020016938215 42.664937816
0x0ca8eb397b0392a26c1f7c9c76bf2cc1c3931d0429fe7a47e35227bd6491a79fMint Token381677182023-01-16 22:22:0421 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.019925037939 42.664937816
0x0c1535c9978ae8ebfe5ecfa6b0e32ff6f291b28f20f6f71437bc1fd256edec4bMint Token381676912023-01-16 22:21:1021 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.020918655 45
0x0dacbf4439fd1c1a9476fa71610eb3d9d18c8a367e98840a887b411d5426dd9dMint Token381676772023-01-16 22:20:3821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.020821725 45
0xb31d1bd359037fa2eb9b0018dcbd521f9d3d5ca1877fa6d327009c22bed2303bMint Token381676772023-01-16 22:20:3821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.02072484 45
0xaa4ae311fe344f56b91368c0789aa805608d4371d6a0d4f19fde79bf208996f3Mint Token381672872023-01-16 22:05:0621 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.017549792332 38.285054324
0x6ff8089a44e226fd8a09ce935dbd7cd964268ec5fcb4367787b58db04c1cd817Mint Token381672742023-01-16 22:04:4021 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.01746736461 38.285054324
0x064468571a2a2111fed3bee88f249289a838a017941551ad1fbc015e1c5d2d70Mint Token381672652023-01-16 22:04:2221 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.017384898603 38.285054324
0x096e409884dfebd8483a9ac2381ac177a107a2379e1d0d2b3ed51c481871de11Mint Token381672462023-01-16 22:03:4421 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.01675078825 37.064350089
0x920dbee2358d69fa830a4583f1d6522dbc6651a0908d4d89ab3a34b1ea91cdb6Mint Token381672362023-01-16 22:03:2421 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.01667095164 37.064350089
0x807eeae824268380a5b86425013fc0178564a868b322d804d34655a854ad8d08Mint Token381672312023-01-16 22:03:1021 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.016591152094 37.064350089
0xd15a7b71fbd8376656401b7ed41b1860980dbedf0066d9eac2e55275ce24fa4dMint Token381672142023-01-16 22:02:3621 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.016227318327 36.426837587
0x00e3b3e0eac970ec63ae68390e7611c6d61a9c9bcd2ca7e8f6a034df9a49f664Mint Token381672012023-01-16 22:02:1021 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.016148891346 36.426837587
0xeae27265f6fd092a2982a6b73692faf9f9fd21ef337ba5108720c293ae50e127Mint Token381671842023-01-16 22:01:3621 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.016760510123 37.991046815
0xb934fc157d54982553c39a1971f1bcbc94e0ecb8706325432b9d574fe8499880Mint Token381671572023-01-16 22:00:3821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.016678715399 37.991046815
0x4a67f108b4f4d6742f2a35750e4fcab9cde45059cca5b63e83312b14f287a998Mint Token381671472023-01-16 22:00:1821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.01965888 45
0x1d2a8c1bcc798fa6bdb0d021f587cea4b5fb6561191bf6ab67a3c8a3489dce24Mint Token381671322023-01-16 21:59:4821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.01956195 45
0xd41d54b20366c0fcef85ac66f2f336ddcf6c754e0adebce0e03331c3775f7844Mint Token381671172023-01-16 21:59:1821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.01995335466 46.128844662
0x1babced19e632b6a3a4511856020daa93465f8cec39314759d9144cde9af8aafMint Token381671002023-01-16 21:58:4021 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.019853993129 46.128844662
0xf5d25088cd4891a0c9cd9ea727672ea18b47bce75489668f8bbca01e49848c71Mint Token381670902023-01-16 21:58:2021 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.019754677726 46.128844662
0x3c45a703be826c27993ac35362dbc0efe70a915415ba5f921626619fa468dbb8Mint Token381670692023-01-16 21:57:3821 days 17 hrs ago0xefe320582dec3ac7cf2358b9ba0e27b203d06ec6 IN  0x311965df66a29a0daefdfb3f62ad1f457bebb7a30 MATIC0.018850432132 44.239871138
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Latest 25 internal transaction
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0xf3876e92c9e336738e2dc0bda12d1c97e46c1ae0c54907cc4596c6b15acd6d40381576842023-01-16 16:23:1821 days 23 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x7129e13e699acfc09e40bac9468738ff873534171.261 MATIC
0x755c4520f18731e4a1b29a880db35eb6996dde9289a1fa1652cd77ca03e990ef365199122022-12-07 2:30:5362 days 13 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x7077e395c9fa4e480366a5dc5792d2504d78dfff1.044 MATIC
0x755c4520f18731e4a1b29a880db35eb6996dde9289a1fa1652cd77ca03e990ef365199122022-12-07 2:30:5362 days 13 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x86536e812b9e7c487c7ad0da6bddc7db453bd4b60.12 MATIC
0xb4c6dc166e4f09c33e0833eab17227c6986429ae97ec7040da06a19d3ffb8517336551912022-09-28 3:14:45132 days 12 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x81d8a628b16deefd457d37c8fee090fc4b3b0a120.97 MATIC
0x698b9077cabb68736be0a3eaed372534e49ac5273f5cda564324078c59f0e4f6336551382022-09-28 3:12:55132 days 12 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x9d7c4682c26a5e87beb02c593a9519101f715d5a1.067 MATIC
0x2619a8b83b404692895361e9874981eb7d1dcb2e21e059fa47dff61038de8577336550452022-09-28 3:09:45132 days 12 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x0803beb75a5084e1b3392bf051c0acab0459ad6d1.94 MATIC
0x09f975dc7a1340d3d6e1130b784535370ec697e0762bae624c487787699dbac4332036242022-09-17 3:36:08143 days 12 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x95dfa7104332782b6f36368d969647a4a62e274a1.94 MATIC
0x5d72adb7d516ef93350832de00682e16916d34d0dcbe8f903d2df946761dedd7327911672022-09-07 4:50:13153 days 11 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x9d7c4682c26a5e87beb02c593a9519101f715d5a0.679 MATIC
0xd8be47215c69faf904e5b40ec49901e49a98b41b097a6d3c7763fde31c031e4f322752642022-08-24 17:43:18166 days 22 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x08a848d63a996836799efdce26e18608a468d5db0.097 MATIC
0xc07b260be210532586662726c44328b8b421e347f2d5e317062185708fb15aba313524992022-07-31 11:57:42191 days 3 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x7129e13e699acfc09e40bac9468738ff873534171.261 MATIC
0x2f754b6361c82be036106ae79267626af57eb26a5a5b93e9024ee44e32dc762f304798822022-07-08 10:34:59214 days 5 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x08a848d63a996836799efdce26e18608a468d5db0.097 MATIC
0xaa7b6e73f62c6190b6770009e679dce8a03f5b54f1e033cdddabacc42478844f304798672022-07-08 10:34:25214 days 5 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x08a848d63a996836799efdce26e18608a468d5db0.097 MATIC
0x1dfb538837c5971c2fbc3cde6e0105573d1bdfce094552a0b1d47bbc48ec38ef304624432022-07-08 0:01:36214 days 15 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x232919da0672f4141e51d075a17d00e2d80b5bb60.87 MATIC
0x1dfb538837c5971c2fbc3cde6e0105573d1bdfce094552a0b1d47bbc48ec38ef304624432022-07-08 0:01:36214 days 15 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x86536e812b9e7c487c7ad0da6bddc7db453bd4b60.1 MATIC
0x67f9be7a10c5d90cc2e4f029727d1c3c567af62624d74c1af97d04a4f703e379294518642022-06-11 21:49:51240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0xe5fc36e48a483313d705ea40b6803365336da6c68201a6cfa7c48f3d7b33a8b4294518222022-06-11 21:48:23240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0x38c64eaa773891753dd0c875c1edf6bce5d71d9a456f66de6467ccc3f61e0cb1294517582022-06-11 21:46:11240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0xf061146822c09a4b99b0d2d50cd968d65207de0430abdaa4d37d340baebc591b294517162022-06-11 21:44:47240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0x6d80733a0cd8d0c31970791fb923a02f25c3a04a81cd6f28eb7fc8ab37d9aa2f294516712022-06-11 21:43:13240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0xe930dfdd677c62fd657ad51ca542b7f64c5a3de8d12b9f1184b05431ec99a0fc294516372022-06-11 21:42:01240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0x855e7c7d95085b170b8248afd3d3b30192f61de2d2bcf0eece8c9ceb395a73c3294515942022-06-11 21:40:35240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0x6db6cf5347130c6d5526c6d52b953b7345c6aebfc01fba26544695ff4dcaa02f294515662022-06-11 21:39:35240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0x910cee73f482ab0363ba6d5cd5b0cdfa9cfed2b01771d1df9f380285a220a6a2294515242022-06-11 21:38:11240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0x3bdf3e01c12a60a34139fe9d91b9bcf80c2467a9727abf7815c22ecc8dc7d006294514902022-06-11 21:36:59240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
0x7ebf9335af554a2b550bea0b3d6801cc6844f8e93d7b561349c08edf3ff7c915294514152022-06-11 21:34:25240 days 18 hrs ago 0x311965df66a29a0daefdfb3f62ad1f457bebb7a30x50af54edabe7fe57ae74f6d9c438aa5a808465130.97 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
Marketplace

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 18 : Marketplace.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Address.sol";

import "./Token.sol";
import "./IERC2981.sol";

contract Marketplace is Ownable, ReentrancyGuard {

    struct Artwork {
        uint256 id;
        address artist;
        string name;
        string metadata;
        uint256 totalSupply;
        uint256 price;
        uint256 royalty;
        bool onsale;
        uint256[] tokenIds;
    }

    struct SellOffer {
        address seller;
        uint256 price;
    }

    using Counters for Counters.Counter;
    using SafeMath for uint256;

    event MadeSellOffer(
        uint256 indexed tokenId,
        address indexed seller,
        uint256 value
    );
    event CancelledSellOffer(uint256 indexed tokenId, address indexed seller);
    event Sold(
        uint256 indexed tokenId,
        address seller,
        address indexed buyer,
        uint256 value
    );
    event ArtworkCreated(uint256 artworkId, address indexed artist);
    event ArtworkMinted(
        uint256 artworkId,
        uint256 indexed tokenId,
        address indexed buyer
    );

    bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;

    Token private token;
    address public tokenAddress = address(0);
    address private developer = address(0);
    uint256 public platformFee = 300;
    uint256 private MIN_PRICE = 1 ether;
    uint256 private MAX_PRICE = 10000 ether;

    Counters.Counter private _artworkIdCounter;

    mapping(uint256 => Artwork) private artworks;
    mapping(uint256 => SellOffer) private sellOffers;

    constructor() {}

    function setToken(address _tokenAddress) external onlyOwner {
        tokenAddress = _tokenAddress;
        token = Token(tokenAddress);
    }

    function setPlatformFee(uint256 fee) public onlyOwner {
        platformFee = fee;
    }

    function setDeveloper(address developerAddress) external onlyOwner {
        developer = developerAddress;
    }

    function getDeveloper() external view onlyOwner returns (address) {
        return developer;
    }

    function setPriceLimits(uint256 minPrice, uint256 maxPrice)
        external
        onlyOwner
    {
        MIN_PRICE = minPrice;
        MAX_PRICE = maxPrice;
    }

    function withdraw() external onlyOwner nonReentrant {
        uint256 royalty = address(this).balance;
        Address.sendValue(payable(developer), royalty);
    }

    function _getStrLen(string memory _str) private pure returns (uint256) {
        uint256 len = bytes(_str).length;
        return len;
    }

    function createArtwork(
        string memory name,
        string memory metadata,
        uint256 totalSupply,
        uint256 price,
        uint256 royalty,
        bool onsale
    ) external {

        require(
            totalSupply > 0 && totalSupply <= 10000,
            "The total supply must be between 1 and 10000"
        );
        require(price >= MIN_PRICE && price <= MAX_PRICE, "invalid price");
        require(
            royalty >= 0 && royalty <= 2500,
            "The royalty must be between 0% and 25%"
        );

        require(_getStrLen(name) > 0 && _getStrLen(name) < 60);
        require(_getStrLen(metadata) > 0);

        require(msg.sender != address(0));

        uint256 id = _artworkIdCounter.current();

        uint256[] memory tokenIds = new uint256[](0);

        Artwork memory artwork = Artwork(
            id,
            msg.sender,
            name,
            metadata,
            totalSupply,
            price,
            royalty,
            onsale,
            tokenIds
        );

        artworks[id] = artwork;

        _artworkIdCounter.increment();

        emit ArtworkCreated(id, msg.sender);
    }

    function getArtworkCounts() public view returns (uint256) {
        return _artworkIdCounter.current();
    }

    function setSaleStatus(
        uint256 id,
        uint256 price,
        uint256 royalty,
        bool onsale
    ) external hasArtwork(id) {
        require(price >= MIN_PRICE && price <= MAX_PRICE, "Invalid price");
        require(royalty >= 0 && royalty <= 2500);

        Artwork memory artwork = artworks[id];
        require(msg.sender == artwork.artist, "Invalid operation.");

        artwork.price = price;
        artwork.royalty = royalty;
        artwork.onsale = onsale;
        artworks[id] = artwork;
    }

    function getArtwork(uint256 id)
        external
        view
        hasArtwork(id)
        returns (Artwork memory artwork)
    {
        return artworks[id];
    }

    function mintToken(uint256 id, string memory url)
        external
        payable
        canMint(id)
        nonReentrant
    {
        Artwork storage artwork = artworks[id];

        uint256 price = artwork.price;
        uint256 platformCharge = price.mul(platformFee).div(10000);
        uint256 transferred = price.sub(platformCharge);

        require(msg.value >= artwork.price, "Invalid price given");

        token.mint(id, artwork.artist, msg.sender, artwork.royalty, url);
        Address.sendValue(payable(artwork.artist), transferred);

        uint256 tokenId = token.getLatestTokenId();
        artwork.tokenIds.push(tokenId);

        emit ArtworkMinted(id, tokenId, msg.sender);
    }

    function acceptOffer(uint256 tokenId)
        external
        payable
        hasSellOffer(tokenId)
        isMarketable(tokenId)
        nonReentrant
    {
        SellOffer memory offer = sellOffers[tokenId];

        // If the artwork is sold or transffered on different platform.
        if (offer.seller != token.ownerOf(tokenId)) {
            delete (sellOffers[tokenId]);
            emit CancelledSellOffer(tokenId, offer.seller);
            revert("Invalid sell offer");
        }

        require(msg.value >= offer.price, "Amount sent too low");

        uint256 platformCharge = offer.price.mul(platformFee).div(10000);

        uint256 restAmount = offer.price.sub(platformCharge);

        uint256[] memory royalties = token.getFeeBps(tokenId);
        address payable[] memory recipents = token.getFeeRecipients(tokenId);

        for (uint256 i = 0; i < royalties.length; i++) {
            uint256 royalty = royalties[i];
            address payable recipent = recipents[i];

            uint256 amount = offer.price.mul(royalty).div(10000);

            if (amount > 0) {
                Address.sendValue(recipent, amount);
                restAmount = restAmount.sub(amount);
            }
        }

        if (restAmount > 0) {
            Address.sendValue(payable(offer.seller), restAmount);
        }

        token.safeTransferFrom(offer.seller, msg.sender, tokenId);

        delete (sellOffers[tokenId]);
        emit Sold(tokenId, offer.seller, msg.sender, msg.value);
    }

    function makeSellOffer(uint256 tokenId, uint256 price)
        external
        tokenOwnerOnly(tokenId)
    {
        if (price > 0) {
            require(price >= MIN_PRICE && price <= MAX_PRICE, "Invalid price");
            sellOffers[tokenId] = SellOffer({seller: msg.sender, price: price});
            token.approve(address(this), tokenId);
        } else {
            emit CancelledSellOffer(tokenId, msg.sender);
            delete sellOffers[tokenId];
        }
        emit MadeSellOffer(tokenId, msg.sender, price);
    }

    function getSellOffer(uint256 tokenId) external view returns (uint256) {
        return sellOffers[tokenId].price;
    }

    modifier isMarketable(uint256 tokenId) {
        require(token.getApproved(tokenId) == address(this), "Not approved");
        _;
    }

    modifier tokenOwnerOnly(uint256 tokenId) {
        require(token.ownerOf(tokenId) == msg.sender, "Not token owner");
        _;
    }

    modifier hasSellOffer(uint256 tokenId) {
        SellOffer memory sellOffer = sellOffers[tokenId];
        bool isAvailable = sellOffer.price != 0 &&
            sellOffer.seller != address(0);
        require(isAvailable, "Invalid sell offer");
        _;
    }

    modifier canMint(uint256 id) {
        Artwork memory artwork = artworks[id];
        require(artwork.artist != address(0) && artwork.totalSupply > 0);
        require(artwork.onsale);
        require(artwork.tokenIds.length < artwork.totalSupply);
        _;
    }

    modifier hasArtwork(uint256 id) {
        Artwork memory artwork = artworks[id];
        require(artwork.artist != address(0) && artwork.totalSupply > 0);
        _;
    }
}

File 2 of 18 : Counters.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 3 of 18 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

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() {
        _transferOwnership(_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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 4 of 18 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 5 of 18 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)

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 6 of 18 : Token.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./HasSecondarySaleFees.sol";
import "./ContextMixin.sol";
import "./IERC2981.sol";

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract Token is
    ERC721,
    Ownable,
    HasSecondarySaleFees,
    ContextMixin,
    ReentrancyGuard
{
    using Counters for Counters.Counter;
    using SafeMath for uint256;

    event Minted(uint256 artworkId, uint256 tokenId, address minter);

    constructor()
        ERC721("polyblocks", "PB")
        HasSecondarySaleFees(new address payable[](0), new uint256[](0))
    {}

    /**
     * This is used instead of msg.sender as transactions won't be sent by the original token owner, but by OpenSea.
     **/
    function _msgSender() internal view override returns (address sender) {
        return ContextMixin.msgSender();
    }

    Counters.Counter private _tokenIdCounter;
    mapping(uint256 => string) private idToURLs;

    address private developer = address(0);
    address private marketplace = address(0);

    function mint(
        uint256 artworkId,
        address artist,
        address collector,
        uint256 royalty,
        string memory url
    ) external senderIsMarketplace {
        uint256 id = _tokenIdCounter.current();

        idToURLs[id] = url;

        _safeMint(artist, id);
        if (artist != collector) {
            safeTransferFrom(artist, collector, id);
        }

        address payable[] memory royaltyAddresses = new address payable[](1);
        royaltyAddresses[0] = payable(artist);
        uint256[] memory royaltiesWithTwoDecimals = new uint256[](1);
        royaltiesWithTwoDecimals[0] = royalty;
        _setRoyaltiesOf(id, royaltyAddresses, royaltiesWithTwoDecimals);

        _tokenIdCounter.increment();

        emit Minted(artworkId, id, collector);
    }

    function getLatestTokenId()
        external
        view
        senderIsMarketplace
        returns (uint256)
    {
        return _tokenIdCounter.current().sub(1);
    }

    function tokenURI(uint256 tokenId)
        public
        view
        override(ERC721)
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );
        return idToURLs[tokenId];
    }

    function setTokenURIs(uint256[] memory ids, string[] memory uris)
        external
        onlyOwner
    {
        for (uint256 i = 0; i < ids.length; i++) {
            uint256 id = ids[i];
            idToURLs[id] = uris[i];
        }
    }

    function setMarket(address contractAddress) external onlyOwner {
        marketplace = contractAddress;
    }

    function setDeveloper(address developerAddress) external onlyOwner {
        developer = developerAddress;
    }

    function withdraw() external onlyOwner nonReentrant {
        Address.sendValue(payable(developer), address(this).balance);
    }

    // The following functions are overrides required by Solidity.
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal override(ERC721) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    /**
     * Override isApprovedForAll to auto-approve OS's proxy contract
     */
    function isApprovedForAll(address _owner, address _operator)
        public
        view
        override
        returns (bool isOperator)
    {
        // if OpenSea's ERC721 Proxy Address is detected, auto-return true
        if (_operator == address(0x58807baD0B376efc12F5AD86aAc70E78ed67deaE)) {
            return true;
        }

        // otherwise, use the default ERC721.isApprovedForAll()
        return ERC721.isApprovedForAll(_owner, _operator);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC721, HasSecondarySaleFees)
        returns (bool)
    {
        return
            interfaceId == type(IERC2981).interfaceId ||
            ERC721.supportsInterface(interfaceId) ||
            HasSecondarySaleFees.supportsInterface(interfaceId);
    }

    modifier senderIsMarketplace() {
        require(
            msg.sender == marketplace,
            "Needs to be called from our marketplace"
        );
        _;
    }
}

File 7 of 18 : IERC2981.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

///
/// @dev Interface for the NFT Royalty Standard
///
interface IERC2981 is IERC165 {
    /// ERC165 bytes to add to interface array - set in parent contract
    /// implementing this standard
    ///
    /// bytes4(keccak256("royaltyInfo(uint256,uint256)")) == 0x2a55205a
    /// bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
    /// _registerInterface(_INTERFACE_ID_ERC2981);

    /// @notice Called with the sale price to determine how much royalty
    //          is owed and to whom.
    /// @param _tokenId - the NFT asset queried for royalty information
    /// @param _salePrice - the sale price of the NFT asset specified by _tokenId
    /// @return receiver - address of who should be sent the royalty payment
    /// @return royaltyAmount - the royalty payment amount for _salePrice
    function royaltyInfo(
        uint256 _tokenId,
        uint256 _salePrice
    ) external view returns (
        address receiver,
        uint256 royaltyAmount
    );

}

File 8 of 18 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)

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 9 of 18 : HasSecondarySaleFees.sol
// SPDX-License-Identifier: MIT
// this is copied from chocomintapp/chocofactory
// https://github.com/chocomintapp/chocofactory/blob/main/packages/contracts/contracts/extentions/HasSecondarySaleFees.sol

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

interface IHasSecondarySaleFees {
    function getFeeBps(uint256 id) external view returns (uint256[] memory);

    function getFeeRecipients(uint256 id) external view returns (address payable[] memory);
}

contract HasSecondarySaleFees is IERC165, IHasSecondarySaleFees {
    
    event ChangeCommonRoyalty(
        address payable[] royaltyAddresses,
        uint256[] royaltiesWithTwoDecimals
    );
    
    event ChangeRoyalty(
        uint256 id,
        address payable[] royaltyAddresses,
        uint256[] royaltiesWithTwoDecimals
    );
    
    struct RoyaltyInfo {
        bool isPresent;
        address payable[] royaltyAddresses;
        uint256[] royaltiesWithTwoDecimals;
    }
    
    mapping(bytes32 => RoyaltyInfo) royaltyInfoMap;
    mapping(uint256 => bytes32) tokenRoyaltyMap;
    
    address payable[] public commonRoyaltyAddresses;
    uint256[] public commonRoyaltiesWithTwoDecimals;

    constructor(
        address payable[] memory _commonRoyaltyAddresses,
        uint256[] memory _commonRoyaltiesWithTwoDecimals
    ) {
        _setCommonRoyalties(_commonRoyaltyAddresses, _commonRoyaltiesWithTwoDecimals);
    }

    function _setRoyaltiesOf(
        uint256 _tokenId,
        address payable[] memory _royaltyAddresses,
        uint256[] memory _royaltiesWithTwoDecimals
    ) internal {
        require(_royaltyAddresses.length == _royaltiesWithTwoDecimals.length, "input length must be same");
        bytes32 key = 0x0;
        for (uint256 i = 0; i < _royaltyAddresses.length; i++) { 
            require(_royaltyAddresses[i] != address(0), "Must not be zero-address");
            key = keccak256(abi.encodePacked(key, _royaltyAddresses[i], _royaltiesWithTwoDecimals[i]));
        }
        
        tokenRoyaltyMap[_tokenId] = key;
        emit ChangeRoyalty(_tokenId, _royaltyAddresses, _royaltiesWithTwoDecimals);
        
        if (royaltyInfoMap[key].isPresent) { 
            return;
        }
        royaltyInfoMap[key] = RoyaltyInfo(
            true,
            _royaltyAddresses,
            _royaltiesWithTwoDecimals
        );
    }

    function _setCommonRoyalties(
        address payable[] memory _commonRoyaltyAddresses,
        uint256[] memory _commonRoyaltiesWithTwoDecimals
    ) internal {
        require(_commonRoyaltyAddresses.length == _commonRoyaltiesWithTwoDecimals.length, "input length must be same");
        for (uint256 i = 0; i < _commonRoyaltyAddresses.length; i++) { 
            require(_commonRoyaltyAddresses[i] != address(0), "Must not be zero-address");
        }
        
        commonRoyaltyAddresses = _commonRoyaltyAddresses;
        commonRoyaltiesWithTwoDecimals = _commonRoyaltiesWithTwoDecimals;
        
        emit ChangeCommonRoyalty(_commonRoyaltyAddresses, _commonRoyaltiesWithTwoDecimals);
    }

    function getFeeRecipients(uint256 _tokenId)
    public view override returns (address payable[] memory)
    {
        RoyaltyInfo memory royaltyInfo = royaltyInfoMap[tokenRoyaltyMap[_tokenId]];
        if (!royaltyInfo.isPresent) {
            return commonRoyaltyAddresses;
        }
        uint256 length = commonRoyaltyAddresses.length + royaltyInfo.royaltyAddresses.length;

        address payable[] memory recipients = new address payable[](length);
        for (uint256 i = 0; i < commonRoyaltyAddresses.length; i++) {
            recipients[i] = commonRoyaltyAddresses[i];
        }
        for (uint256 i = 0; i < royaltyInfo.royaltyAddresses.length; i++) {
            recipients[i + commonRoyaltyAddresses.length] = royaltyInfo.royaltyAddresses[i];
        }

        return recipients;
    }

    function getFeeBps(uint256 _tokenId) public view override returns (uint256[] memory) {
        RoyaltyInfo memory royaltyInfo = royaltyInfoMap[tokenRoyaltyMap[_tokenId]];
        if (!royaltyInfo.isPresent) {
            return commonRoyaltiesWithTwoDecimals;
        }
        uint256 length = commonRoyaltiesWithTwoDecimals.length + royaltyInfo.royaltiesWithTwoDecimals.length;

        uint256[] memory fees = new uint256[](length);
        for (uint256 i = 0; i < commonRoyaltiesWithTwoDecimals.length; i++) {
            fees[i] = commonRoyaltiesWithTwoDecimals[i];
        }
        for (uint256 i = 0; i < royaltyInfo.royaltiesWithTwoDecimals.length; i++) {
            fees[i + commonRoyaltyAddresses.length] = royaltyInfo.royaltiesWithTwoDecimals[i];
        }

        return fees;
    }

    function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override(IERC165)
    returns (bool)
    {
        return interfaceId == type(IHasSecondarySaleFees).interfaceId;
    }

}

File 10 of 18 : ContextMixin.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * https://github.com/maticnetwork/pos-portal/blob/master/contracts/common/ContextMixin.sol
 * https://docs.opensea.io/docs/polygon-basic-integration
 */
abstract contract ContextMixin {
    function msgSender()
        internal
        view
        returns (address payable sender)
    {
        if (msg.sender == address(this)) {
            bytes memory array = msg.data;
            uint256 index = msg.data.length;
            assembly {
                // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those.
                sender := and(
                    mload(add(array, index)),
                    0xffffffffffffffffffffffffffffffffffffffff
                )
            }
        } else {
            sender = payable(msg.sender);
        }
        return sender;
    }
}

File 11 of 18 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/ERC721.sol)

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 {
        _setApprovalForAll(_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 Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @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 12 of 18 : SafeMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/math/SafeMath.sol)

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 generally not needed starting with Solidity 0.8, since 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 13 of 18 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol)

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 14 of 18 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol)

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 15 of 18 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol)

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 16 of 18 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721Receiver.sol)

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 17 of 18 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol)

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 18 of 18 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)

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);
    }
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"artworkId","type":"uint256"},{"indexed":true,"internalType":"address","name":"artist","type":"address"}],"name":"ArtworkCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"artworkId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"address","name":"buyer","type":"address"}],"name":"ArtworkMinted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"address","name":"seller","type":"address"}],"name":"CancelledSellOffer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"address","name":"seller","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"MadeSellOffer","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":false,"internalType":"address","name":"seller","type":"address"},{"indexed":true,"internalType":"address","name":"buyer","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Sold","type":"event"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"acceptOffer","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"metadata","type":"string"},{"internalType":"uint256","name":"totalSupply","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"royalty","type":"uint256"},{"internalType":"bool","name":"onsale","type":"bool"}],"name":"createArtwork","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"getArtwork","outputs":[{"components":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"address","name":"artist","type":"address"},{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"metadata","type":"string"},{"internalType":"uint256","name":"totalSupply","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"royalty","type":"uint256"},{"internalType":"bool","name":"onsale","type":"bool"},{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"}],"internalType":"struct Marketplace.Artwork","name":"artwork","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getArtworkCounts","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getDeveloper","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getSellOffer","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"name":"makeSellOffer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"string","name":"url","type":"string"}],"name":"mintToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"platformFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"developerAddress","type":"address"}],"name":"setDeveloper","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"fee","type":"uint256"}],"name":"setPlatformFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"minPrice","type":"uint256"},{"internalType":"uint256","name":"maxPrice","type":"uint256"}],"name":"setPriceLimits","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"royalty","type":"uint256"},{"internalType":"bool","name":"onsale","type":"bool"}],"name":"setSaleStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"}],"name":"setToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"tokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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