MATIC Price: $1.01 (-2.01%)
Gas: 207 GWei
 

Overview

MATIC Balance

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MATIC Value

$0.00

Token Holdings

Multichain Info

1 address found via
Transaction Hash
Method
Block
From
To
Value
Unlist NFT548671472024-03-20 5:41:168 days ago1710913276IN
0xa481bD21...4A072ad86
0 MATIC0.0111839987.61456135
Unlist NFT506672972023-12-02 21:33:06116 days ago1701552786IN
0xa481bD21...4A072ad86
0 MATIC0.004340534
List NFT506656662023-12-02 20:34:38116 days ago1701549278IN
0xa481bD21...4A072ad86
0 MATIC0.007541136
Unlist NFT506656432023-12-02 20:33:48116 days ago1701549228IN
0xa481bD21...4A072ad86
0 MATIC0.0044681735
List NFT506655752023-12-02 20:31:24116 days ago1701549084IN
0xa481bD21...4A072ad86
0 MATIC0.0084868737
List NFT492923042023-10-29 11:27:37150 days ago1698578857IN
0xa481bD21...4A072ad86
0 MATIC0.01762484.13417918
Unlist NFT492922442023-10-29 11:25:29150 days ago1698578729IN
0xa481bD21...4A072ad86
0 MATIC0.0102129680
List NFT490228942023-10-22 14:59:41157 days ago1697986781IN
0xa481bD21...4A072ad86
0 MATIC0.0165283978.90391064
Unlist NFT490228762023-10-22 14:59:03157 days ago1697986743IN
0xa481bD21...4A072ad86
0 MATIC0.0104682882
List NFT468129322023-08-27 10:23:20214 days ago1693131800IN
0xa481bD21...4A072ad86
0 MATIC0.02382519113.73764543
List NFT468129062023-08-27 10:22:24214 days ago1693131744IN
0xa481bD21...4A072ad86
0 MATIC0.02157468103
Unlist NFT467427472023-08-25 16:10:14215 days ago1692979814IN
0xa481bD21...4A072ad86
0 MATIC0.0124297897.36478712
Execute NFT Trad...467425262023-08-25 16:02:24215 days ago1692979344IN
0xa481bD21...4A072ad86
5 MATIC0.03595823134
List NFT467424962023-08-25 16:01:22215 days ago1692979282IN
0xa481bD21...4A072ad86
0 MATIC0.02649653126.49744315
Unlist NFT467423012023-08-25 15:53:54215 days ago1692978834IN
0xa481bD21...4A072ad86
0 MATIC0.0125057697.95998491
List NFT453983182023-07-22 22:06:33249 days ago1690063593IN
0xa481bD21...4A072ad86
0 MATIC0.0038228440
Unlist NFT451334452023-07-16 4:05:42256 days ago1689480342IN
0xa481bD21...4A072ad86
0 MATIC0.0084383100.66095944
Unlist NFT451334452023-07-16 4:05:42256 days ago1689480342IN
0xa481bD21...4A072ad86
0 MATIC0.0056171244
Execute NFT Trad...445516512023-07-01 10:23:40271 days ago1688207020IN
0xa481bD21...4A072ad86
120 MATIC0.04087214155.08601591
Execute NFT Trad...445218842023-06-30 15:55:21271 days ago1688140521IN
0xa481bD21...4A072ad86
200 MATIC0.06799461258
List NFT445216822023-06-30 15:48:13271 days ago1688140093IN
0xa481bD21...4A072ad86
0 MATIC0.06001197286.48750683
Execute NFT Trad...445077092023-06-30 7:26:48272 days ago1688110008IN
0xa481bD21...4A072ad86
210 MATIC0.04911287175
Unlist NFT444821312023-06-29 15:47:12272 days ago1688053632IN
0xa481bD21...4A072ad86
0 MATIC0.02234085175
List NFT444797832023-06-29 14:20:46272 days ago1688048446IN
0xa481bD21...4A072ad86
0 MATIC0.05606366267.65426297
Unlist NFT444685682023-06-29 7:24:22273 days ago1688023462IN
0xa481bD21...4A072ad86
0 MATIC0.02661344208.46805065
View all transactions

Latest 25 internal transactions (View All)

Parent Txn Hash Block From To Value
467425262023-08-25 16:02:24215 days ago1692979344
0xa481bD21...4A072ad86
4.375 MATIC
467425262023-08-25 16:02:24215 days ago1692979344
0xa481bD21...4A072ad86
0.125 MATIC
467425262023-08-25 16:02:24215 days ago1692979344
0xa481bD21...4A072ad86
0.5 MATIC
445516512023-07-01 10:23:40271 days ago1688207020
0xa481bD21...4A072ad86
105 MATIC
445516512023-07-01 10:23:40271 days ago1688207020
0xa481bD21...4A072ad86
3 MATIC
445516512023-07-01 10:23:40271 days ago1688207020
0xa481bD21...4A072ad86
12 MATIC
445218842023-06-30 15:55:21271 days ago1688140521
0xa481bD21...4A072ad86
175 MATIC
445218842023-06-30 15:55:21271 days ago1688140521
0xa481bD21...4A072ad86
5 MATIC
445218842023-06-30 15:55:21271 days ago1688140521
0xa481bD21...4A072ad86
20 MATIC
445077092023-06-30 7:26:48272 days ago1688110008
0xa481bD21...4A072ad86
183.75 MATIC
445077092023-06-30 7:26:48272 days ago1688110008
0xa481bD21...4A072ad86
5.25 MATIC
445077092023-06-30 7:26:48272 days ago1688110008
0xa481bD21...4A072ad86
21 MATIC
416851082023-04-18 20:57:21344 days ago1681851441
0xa481bD21...4A072ad86
87.5 MATIC
416851082023-04-18 20:57:21344 days ago1681851441
0xa481bD21...4A072ad86
2.5 MATIC
416851082023-04-18 20:57:21344 days ago1681851441
0xa481bD21...4A072ad86
10 MATIC
406288872023-03-22 7:19:00372 days ago1679469540
0xa481bD21...4A072ad86
4.375 MATIC
406288872023-03-22 7:19:00372 days ago1679469540
0xa481bD21...4A072ad86
0.125 MATIC
406288872023-03-22 7:19:00372 days ago1679469540
0xa481bD21...4A072ad86
0.5 MATIC
406287452023-03-22 7:13:58372 days ago1679469238
0xa481bD21...4A072ad86
4.375 MATIC
406287452023-03-22 7:13:58372 days ago1679469238
0xa481bD21...4A072ad86
0.125 MATIC
406287452023-03-22 7:13:58372 days ago1679469238
0xa481bD21...4A072ad86
0.5 MATIC
404983492023-03-18 18:02:54375 days ago1679162574
0xa481bD21...4A072ad86
6.125 MATIC
404983492023-03-18 18:02:54375 days ago1679162574
0xa481bD21...4A072ad86
0.175 MATIC
404983492023-03-18 18:02:54375 days ago1679162574
0xa481bD21...4A072ad86
0.7 MATIC
404982112023-03-18 17:56:58375 days ago1679162218
0xa481bD21...4A072ad86
6.125 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
SCTrading

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 18 : SCTrading.sol
// Contract based on https://docs.openzeppelin.com/contracts/4.x/erc721
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "./SCNFT.sol";
import "./SCWhitelist.sol";
import "./extensions/Royalties.sol";

contract SCTrading is Context, Ownable{

    struct ListedNFT {
        address contractAddress;
        uint256 tokenId;
        uint256 price;
    }

    mapping(string => ListedNFT) private _listedNFTs;

    address private _marketFeeAccount;
    uint256 private _marketFee;

    constructor(address marketFeeAccount, uint256 marketFee){
        _marketFee = marketFee;
        _marketFeeAccount = marketFeeAccount;
    }

    function listNFT(address scnftContractAddress, uint256 tokenId, uint256 listPrice) external {
        
        // Check if token exists
        require(SCNFT(scnftContractAddress).isValidToken(tokenId), "SCTrading: Token does not exist");
        
        // Add access restrictions
        address owner = ERC721(scnftContractAddress).ownerOf(tokenId);
        require(
            _msgSender() == owner || ERC721(scnftContractAddress).isApprovedForAll(owner, _msgSender()),
            "SCTrading: List NFT caller is not token owner or approved for all"
        );

        Status collectionStatus = SCNFT(scnftContractAddress).getSaleStatus();
        bool isTokenPrimarySaleCompleted = SCNFT(scnftContractAddress).getTokenPrimarySale(tokenId);

        require(collectionStatus!=Status.HOLD, "SCTrading: Collection on hold");

        require(isTokenPrimarySaleCompleted && collectionStatus==Status.SECONDARY
            || !isTokenPrimarySaleCompleted, 
            "SCTrading: Collection secondary sale not enabled or on hold");
        
        SCNFT(scnftContractAddress).approve(address(this),tokenId);
        // Check if NFT if approve for this contract
        require(SCNFT(scnftContractAddress).getApproved(tokenId) == address(this), "SCTrading: Token not approved for snowcrash trading contract");
        // check if NFT is listed
        require(!isNFTListed(scnftContractAddress, tokenId), "SCTrading: NFT already listed.");
        string memory listedNFTsKey = string.concat(_toString(scnftContractAddress),_toString(tokenId));
        _listedNFTs[listedNFTsKey] = ListedNFT(
            scnftContractAddress,
            tokenId,
            listPrice
        );
    }

    function unlistNFT(address scnftContractAddress, uint256 tokenId) external {
        address owner = ERC721(scnftContractAddress).ownerOf(tokenId);
        require(
            _msgSender() == owner || ERC721(scnftContractAddress).isApprovedForAll(owner, _msgSender()),
            "SCTrading: List NFT caller is not token owner or approved for all"
        );
        ListedNFT memory listedNft = getNFTListed(scnftContractAddress, tokenId);
        require(listedNft.contractAddress != address(0), "SCTrading: NFT not listed for sale");
        _deleteListedNFT(scnftContractAddress, tokenId);
    }

    function updateListedNFT(address scnftContractAddress, uint256 tokenId, uint256 listPrice) external {
        
        address owner = ERC721(scnftContractAddress).ownerOf(tokenId);
        require(
            _msgSender() == owner || ERC721(scnftContractAddress).isApprovedForAll(owner, _msgSender()),
            "SCTrading: List NFT caller is not token owner or approved for all"
        );
        ListedNFT memory listedNft = getNFTListed(scnftContractAddress, tokenId);
        require(listedNft.contractAddress != address(0), "SCTrading: NFT not listed for sale");

        string memory listedNFTsKey = string.concat(_toString(scnftContractAddress),_toString(tokenId));
        _listedNFTs[listedNFTsKey] = ListedNFT(
            scnftContractAddress,
            tokenId,
            listPrice
        );
    }

    function getNFTListed(address scnftContractAddress, uint256 tokenId) public view returns(ListedNFT memory){
        string memory listedNFTsKey = string.concat(_toString(scnftContractAddress),_toString(tokenId));
        return _listedNFTs[listedNFTsKey];
    }

    function isNFTListed(address scnftContractAddress, uint256 tokenId) public view returns(bool){
        string memory listedNFTsKey = string.concat(_toString(scnftContractAddress),_toString(tokenId));
        return _listedNFTs[listedNFTsKey].contractAddress != address(0);
    }

    function executeNFTTrade(address scnftContractAddress, address to, uint256 tokenId) external payable {
        
        Status collectionStatus = SCNFT(scnftContractAddress).getSaleStatus();

        require(collectionStatus!=Status.PREP, "SCTrading: Collection is not yet ready");
        require(collectionStatus!=Status.HOLD, "SCTrading: Collection on hold");

        // check KYC WHITELIST
        address whitelistContractAddress = SCNFT(scnftContractAddress).getWhitelistContract();
        if(whitelistContractAddress != address(0)){
            require(SCWhitelist(whitelistContractAddress).isUserKYCWhitelisted(scnftContractAddress, to)
                ,"SCTrading: User not KYCed");
        }
        
        if(collectionStatus == Status.PRESALE){
            // check PRESALE WHITELIST
            if(whitelistContractAddress != address(0)){
                require(SCWhitelist(whitelistContractAddress).isUserKYCWhitelisted(scnftContractAddress, to)
                    ,"SCTrading: User not whitelisted for presale");
            }
        }
        
        ListedNFT memory listedNft = getNFTListed(scnftContractAddress, tokenId);
        require(listedNft.contractAddress != address(0), "SCTrading: NFT not listed for sale");
        require(msg.value == listedNft.price, "SCTrading: Exact listed price needs to be transfered in value");
        
        // transfer based on royalities data and primary sale flag
        _transferBasedOnRoyalties(scnftContractAddress, tokenId, listedNft.price);

        // Unfreeze token
        SCNFT(scnftContractAddress).unFreezeToken(tokenId);

        // transfer NFT
        address owner = ERC721(scnftContractAddress).ownerOf(tokenId);
        SCNFT(scnftContractAddress).transferFrom(owner, to, tokenId);

        // Freeze NFT to owner
        SCNFT(scnftContractAddress).freezeToken(tokenId);

        // Remove from listing 
        _deleteListedNFT(scnftContractAddress, tokenId);
    }

    function claimBalance(address toAddress) external onlyOwner{
        (bool sent,) = payable(toAddress).call{value: address(this).balance}("");
        require(sent, "SCTrading: Transfer balance failed");
    }

    function updateMarketFeeAndAccount(address marketFeeAccount, uint256 marketFee) external onlyOwner{
        _marketFeeAccount = marketFeeAccount;
        _marketFee = marketFee;
    }

    function _transferBasedOnRoyalties(address scnftContractAddress, uint256 tokenId, uint256 listPrice) internal {
        bool isPrimarySaleCompleted = SCNFT(scnftContractAddress).getTokenPrimarySale(tokenId);
        uint256 feeDenominator = SCNFT(scnftContractAddress).feeDenominator();
        bool sent;
        if(isPrimarySaleCompleted){
            RoyaltyInfo[] memory ri =  SCNFT(scnftContractAddress).getSecondaryRoyaltyInfo(tokenId);
            uint256 royaltyBasisPoints =  SCNFT(scnftContractAddress).getRoyaltyBasisPoints(tokenId);
            uint256 royaltyShare = listPrice * royaltyBasisPoints / feeDenominator;
            for(uint256 i=0; i < ri.length; i++) {
                address payable receiver = payable(ri[i].receiver);
                (sent,) = receiver.call{value: ri[i].royaltyFraction * royaltyShare / feeDenominator}("");
                require(sent, "SCTrading: Transfer royalty failed");
            }
            uint256 marketFeeShare = listPrice * _marketFee / feeDenominator;
            (sent,) = payable(_marketFeeAccount).call{value: marketFeeShare}("");
            require(sent, "SCTrading: Transfer market fee failed");
            address payable owner = payable(ERC721(scnftContractAddress).ownerOf(tokenId));
            (sent,) = owner.call{value: listPrice - royaltyShare - marketFeeShare}("");
            require(sent, "SCTrading: Transfer to owner failed");
        }else{
            RoyaltyInfo[] memory ri =  SCNFT(scnftContractAddress).getPrimaryRoyaltyInfo(tokenId);
            for(uint256 i=0; i < ri.length; i++) {
                address payable receiver = payable(ri[i].receiver);
                (sent,) = receiver.call{value: (ri[i].royaltyFraction * listPrice / feeDenominator)}("");
                require(sent, "SCTrading: Transfer primary share failed");
            }
            SCNFT(scnftContractAddress).setTokenPrimarySale(tokenId);
        }
        
    }

    function _deleteListedNFT(address scnftContractAddress, uint256 tokenId) internal{
        string memory listedNFTsKey = string.concat(_toString(scnftContractAddress),_toString(tokenId));
        delete _listedNFTs[listedNFTsKey];
    }

    function _toString(address account) internal pure returns(string memory) {
        return _toString(abi.encodePacked(account));
    }

    function _toString(uint256 value) internal pure returns(string memory) {
        return _toString(abi.encodePacked(value));
    }

    function _toString(bytes memory data) internal pure returns(string memory) {
        bytes memory alphabet = "0123456789abcdef";

        bytes memory str = new bytes(2 + data.length * 2);
        str[0] = "0";
        str[1] = "x";
        for (uint i = 0; i < data.length; i++) {
            str[2+i*2] = alphabet[uint(uint8(data[i] >> 4))];
            str[3+i*2] = alphabet[uint(uint8(data[i] & 0x0f))];
        }
        return string(str);
    }

}

File 2 of 18 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 3 of 18 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        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) {
        _requireMinted(tokenId);

        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 overridden 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 token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        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: caller is not token owner or 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: caller is not token owner or 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 the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @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 _ownerOf(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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

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

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

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

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @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 from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {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 an {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 Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @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 {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256, /* firstTokenId */
        uint256 batchSize
    ) internal virtual {
        if (batchSize > 1) {
            if (from != address(0)) {
                _balances[from] -= batchSize;
            }
            if (to != address(0)) {
                _balances[to] += batchSize;
            }
        }
    }

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}
}

File 4 of 18 : ERC721URIStorage.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

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

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev See {ERC721-_burn}. This override additionally checks to see if a
     * token-specific URI was set for the token, and if so, it deletes the token URI from
     * the storage mapping.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

File 5 of 18 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 6 of 18 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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`.
     *
     * 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;

    /**
     * @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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * 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 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 the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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);
}

File 7 of 18 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 8 of 18 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

File 9 of 18 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 10 of 18 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 11 of 18 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 12 of 18 : Math.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

File 13 of 18 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @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] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

File 14 of 18 : Freezible.sol
// Contract based on https://docs.openzeppelin.com/contracts/4.x/erc721
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

abstract contract Freezible {

    address private freezeAuthority;

    mapping(uint256 => bool) private tokenFreezeStatuses;

    function _freezeToken(uint256 tokenId) internal {
        tokenFreezeStatuses[tokenId] = true;
    }

    function _unFreezeToken(uint256 tokenId) internal {
        tokenFreezeStatuses[tokenId] = false;
    }

    function _isTokenFrozen(uint256 tokenId) internal view virtual returns(bool) {
        return tokenFreezeStatuses[tokenId];
    }

    function _setFreezeAuthority(address freezeAuth) internal {
        freezeAuthority = freezeAuth;
    }

    function _getFreezeAuthority() internal view returns(address){
        return freezeAuthority;
    }

    function _burnFreezeData(uint256 tokenId) internal {
        delete tokenFreezeStatuses[tokenId];
    }

}

File 15 of 18 : Royalties.sol
// Contract based on https://docs.openzeppelin.com/contracts/4.x/erc721
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

struct RoyaltyInfo {
    address receiver;
    uint96 royaltyFraction;
}

abstract contract Royalties {

    mapping(uint256 => RoyaltyInfo[]) private _tokenPrimaryRoyaltyInfo;
    mapping(uint256 => RoyaltyInfo[]) private _tokenSecondaryRoyaltyInfo;

    mapping(uint256 => bool) private _isTokenPrimarySaleCompeted;

    mapping(uint256 => uint256) private _tokenRoyaltyBasisPoint;

    function _setPrimaryRoyaltyInfo(uint256 tokenId, RoyaltyInfo[] memory primaryRoyaltyInfo) internal {
        
        for(uint256 i=0; i < primaryRoyaltyInfo.length; i++) {
            _tokenPrimaryRoyaltyInfo[tokenId].push(RoyaltyInfo(
                primaryRoyaltyInfo[i].receiver,
                primaryRoyaltyInfo[i].royaltyFraction
            ));
        }
    }

    function getPrimaryRoyaltyInfo(uint256 tokenId) public view returns(RoyaltyInfo[] memory){
        return _tokenPrimaryRoyaltyInfo[tokenId];
    }

    function _setSecondaryRoyaltyInfo(uint256 tokenId, RoyaltyInfo[] memory secondaryRoyaltyInfo) internal {
        for(uint256 i=0; i < secondaryRoyaltyInfo.length; i++) {
            _tokenSecondaryRoyaltyInfo[tokenId].push(RoyaltyInfo(
                secondaryRoyaltyInfo[i].receiver,
                secondaryRoyaltyInfo[i].royaltyFraction
            ));
        }
    }

    function getSecondaryRoyaltyInfo(uint256 tokenId) public view returns(RoyaltyInfo[] memory){
        return _tokenSecondaryRoyaltyInfo[tokenId];
    }

    function setTokenPrimarySale(uint256 tokenId) public {
        _isTokenPrimarySaleCompeted[tokenId] = true;
    }

    function getTokenPrimarySale(uint256 tokenId) public view returns(bool){
        return _isTokenPrimarySaleCompeted[tokenId];
    }

    function _setRoyaltyBasisPoints(uint256 tokenId, uint256 royaltyBasisPoints) internal {
        _tokenRoyaltyBasisPoint[tokenId] = royaltyBasisPoints;
    }

    function getRoyaltyBasisPoints(uint256 tokenId) public view returns(uint256){
        return _tokenRoyaltyBasisPoint[tokenId];
    }

    function _burnRoyaltyData(uint256 tokenId) internal {
        delete _tokenRoyaltyBasisPoint[tokenId];
        delete _tokenSecondaryRoyaltyInfo[tokenId];
        delete _tokenPrimaryRoyaltyInfo[tokenId];
        delete _isTokenPrimarySaleCompeted[tokenId];
    }
    
    /**
     * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a
     * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an
     * override.
     */
    function feeDenominator() public pure virtual returns (uint96) {
        return 10000;
    }
}

File 16 of 18 : Library.sol
// Contract based on https://docs.openzeppelin.com/contracts/4.x/erc721
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

enum Status { 
    PREP, 
    PRESALE, 
    PRIMARY,
    SECONDARY, 
    HOLD 
}

File 17 of 18 : SCNFT.sol
// Contract based on https://docs.openzeppelin.com/contracts/4.x/erc721
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "./extensions/Freezible.sol";
import "./extensions/Royalties.sol";
import "./lib/Library.sol";


contract SCNFT is Context, ERC721URIStorage, Ownable, Freezible, Royalties {

    Status private _saleStatus;

    address private _whitelistContractAddress;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;
    
    constructor(string memory name_, string memory symbol_ ) ERC721(name_, symbol_) {
        _saleStatus = Status.PREP;
    }


     /**
     * Mints NFT with provided `tokenId` and transfers it to receipent provided.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `recipient` cannot be the zero address.
     * - `tokenURI` URI points to Snowcrash NFT Metadata
     *
     */
    function mintNFTWithTokenIdAndRoyalities(
        address recipient, 
        string memory tokenURI, 
        uint256 tokenId,
        RoyaltyInfo[] memory primaryRoyaltyInfo,
        RoyaltyInfo[] memory secondaryRoyaltyInfo,
        uint256 royaltyBasisPoints)
        external onlyOwner
        returns (uint256)
    {
        _safeMint(recipient, tokenId);
        _setTokenURI(tokenId, tokenURI);
        _freezeToken(tokenId);
        _setPrimaryRoyaltyInfo(tokenId, primaryRoyaltyInfo);
        _setSecondaryRoyaltyInfo(tokenId, secondaryRoyaltyInfo);
        _setRoyaltyBasisPoints(tokenId, royaltyBasisPoints);
        _addTokenToTokensEnumeration(tokenId);
        return tokenId;
        
    }

    function updateTokenURI(string memory tokenURI, 
        uint256 tokenId) external onlyOwner{
        _setTokenURI(tokenId, tokenURI);
    }

    function burnToken(uint256 tokenId) external onlyOwner{
        _requireMinted(tokenId);
        _burn(tokenId);
        _burnFreezeData(tokenId);
        _burnRoyaltyData(tokenId);
        _burnTokenFromTokensEnumeration(tokenId);
    }

    function setFreezeAuthority(address freezeAuth) external onlyOwner {
        _setFreezeAuthority(freezeAuth);
    }

    function freezeToken(uint256 tokenId) external {
        _requireMinted(tokenId);
        require(
            _msgSender() == _getFreezeAuthority() || _msgSender() == owner(),
            "SCNFT: Snowcrash authority required to freeze"
        );
        _freezeToken(tokenId);
    }

    function unFreezeToken(uint256 tokenId) external {
        _requireMinted(tokenId);
        require(
            _msgSender() == _getFreezeAuthority() || _msgSender() == owner(),
            "SCNFT: Snowcrash authority required to unfreeze"
        );
        _unFreezeToken(tokenId);
    }

    function isTokenFrozen(uint256 tokenId) external view returns(bool) {
        _requireMinted(tokenId);
        require(
            _msgSender() == _getFreezeAuthority() || _msgSender() == owner(),
            "SCNFT: Snowcrash authority required to view freeze status"
        );
        return _isTokenFrozen(tokenId);
    }

    function _transfer(
        address from,
        address to,
        uint256 tokenId
    )internal override{
        require(!_isTokenFrozen(tokenId), "SCNFT: NFT frozen to wallet. Can only be tradable on snowcrash.com");
        super._transfer(from, to, tokenId);
    }

    function airdropTo(address from, address to, uint256 tokenId) public onlyOwner{
        _unFreezeToken(tokenId);
        transferFrom(from, to, tokenId);
        _freezeToken(tokenId);
        setTokenPrimarySale(tokenId);
    }

    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");
        _approve(to, tokenId);
    }

    function _approve(address to, uint256 tokenId) internal  override {
         require(
            _msgSender() == _getFreezeAuthority() || _msgSender() == owner(),
            "SCNFT: Snowcrash authority required to approve"
        );
        super._approve(to, tokenId);
    }

    function isValidToken(uint256 tokenId) view external returns(bool){
        _requireMinted(tokenId);
        return true;
    }

    function setSaleStatus(Status status) external onlyOwner {
        _saleStatus = status;
    }
    
    function getSaleStatus() view external returns(Status){
        return _saleStatus;
    }

    function setWhitelistContract(address whitelistContractAdddress) external onlyOwner {
        _whitelistContractAddress = whitelistContractAdddress;
    }

    function getWhitelistContract() view external returns(address) {
        require(
            _msgSender() == _getFreezeAuthority() || _msgSender() == owner(),
            "SCNFT: Snowcrash authority required"
        );
        return _whitelistContractAddress;
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual returns (uint256) {
        return _allTokens.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 _addTokenToTokensEnumeration(uint256 tokenId) private {
        _allTokens.push(tokenId);
    }

    function _burnTokenFromTokensEnumeration(uint256 tokenId) private {
        delete _allTokens[tokenId];
    }

}

File 18 of 18 : SCWhitelist.sol
// Contract based on https://docs.openzeppelin.com/contracts/4.x/erc721
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Context.sol";

contract SCWhitelist is Context, Ownable {

    mapping(string => bool) private _kycWhitelist;
    mapping(string => bool) private _presaleWhitelist;

    function addKYCUser(address scnftContractAddress, address userAccountAddress) public onlyOwner{
        string memory mapKey = string.concat(_toString(scnftContractAddress),_toString(userAccountAddress));
        _kycWhitelist[mapKey] = true;
    }

    function removeKYCUser(address scnftContractAddress, address userAccountAddress) public onlyOwner{
        string memory mapKey = string.concat(_toString(scnftContractAddress),_toString(userAccountAddress));
        delete _kycWhitelist[mapKey];
    }

    function isUserKYCWhitelisted(address scnftContractAddress, address userAccountAddress) public view returns(bool){
        string memory mapKey = string.concat(_toString(scnftContractAddress),_toString(userAccountAddress));
        return _kycWhitelist[mapKey];
    }

    function addPresaleUser(address scnftContractAddress, address userAccountAddress) public onlyOwner{
        string memory mapKey = string.concat(_toString(scnftContractAddress),_toString(userAccountAddress));
        _presaleWhitelist[mapKey] = true;
    }

    function removePresaleUser(address scnftContractAddress, address userAccountAddress) public onlyOwner{
        string memory mapKey = string.concat(_toString(scnftContractAddress),_toString(userAccountAddress));
        delete _presaleWhitelist[mapKey];
    }

    function isUserPresaleWhitelisted(address scnftContractAddress, address userAccountAddress) public view returns(bool){
        string memory mapKey = string.concat(_toString(scnftContractAddress),_toString(userAccountAddress));
        return _presaleWhitelist[mapKey];
    }


    function _toString(address account) internal pure returns(string memory) {
        return _toString(abi.encodePacked(account));
    }

    function _toString(uint256 value) internal pure returns(string memory) {
        return _toString(abi.encodePacked(value));
    }

    function _toString(bytes memory data) internal pure returns(string memory) {
        bytes memory alphabet = "0123456789abcdef";

        bytes memory str = new bytes(2 + data.length * 2);
        str[0] = "0";
        str[1] = "x";
        for (uint i = 0; i < data.length; i++) {
            str[2+i*2] = alphabet[uint(uint8(data[i] >> 4))];
            str[3+i*2] = alphabet[uint(uint8(data[i] & 0x0f))];
        }
        return string(str);
    }

}

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

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"marketFeeAccount","type":"address"},{"internalType":"uint256","name":"marketFee","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"toAddress","type":"address"}],"name":"claimBalance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"scnftContractAddress","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"executeNFTTrade","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"scnftContractAddress","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getNFTListed","outputs":[{"components":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct SCTrading.ListedNFT","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"scnftContractAddress","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"isNFTListed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"scnftContractAddress","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"listPrice","type":"uint256"}],"name":"listNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"scnftContractAddress","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"unlistNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"scnftContractAddress","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"listPrice","type":"uint256"}],"name":"updateListedNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"marketFeeAccount","type":"address"},{"internalType":"uint256","name":"marketFee","type":"uint256"}],"name":"updateMarketFeeAndAccount","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000006a1bc3bbcf58bb96a472bb5cc83ce28d51a6c0c600000000000000000000000000000000000000000000000000000000000000fa

-----Decoded View---------------
Arg [0] : marketFeeAccount (address): 0x6a1Bc3BBCf58bB96A472bb5cC83Ce28D51a6c0C6
Arg [1] : marketFee (uint256): 250

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000006a1bc3bbcf58bb96a472bb5cc83ce28d51a6c0c6
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000fa


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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.