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Outline

•  contract NiftyEntity
• interface NiftyRegistry
•    - function isValidNiftySender(address s ...
• interface IERC165
•    - function supportsInterface(bytes4 int ...
• interface IERC721 is IERC165
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function safeTransferFrom(address fro ...
•    - function transferFrom(address from, a ...
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address own ...
•    - function safeTransferFrom(address fro ...
• interface IERC721Receiver
•    - function onERC721Received(address ope ...
• interface IERC721Metadata is IERC721
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 tokenId)
•    - function _msgSender()
• library Strings
•    - function toString(uint256 value)
•    - function supportsInterface(bytes4 int ...
•  contract ERC721 is NiftyEntity, Co ...
•    - function supportsInterface(bytes4 int ...
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 tokenId)
•    - function tokenIPFSHash(uint256 tokenI ...
•    - function _getNiftyTypeId(uint256 toke ...
•    - function tokenName(uint256 tokenId)
•    - function _setTokenIPFSHashNiftyType(u ...
•    - function _setNiftyTypeName(uint256 ni ...
•    - function _setBaseURI(string memory ba ...
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address own ...
•    - function transferFrom(address from, a ...
•    - function safeTransferFrom(address fro ...
•    - function safeTransferFrom(address fro ...
•    - function _safeTransfer(address from, ...
•    - function _exists(uint256 tokenId)
•    - function _isApprovedOrOwner(address s ...
•    - function _burn(uint256 tokenId)
•    - function _transfer(address from, addr ...
•    - function _approve(address to, uint256 ...
•    - function _checkOnERC721Received(addre ...
•    - function isContract(address account)
•    - function burn(uint256 tokenId)
•  contract NiftyBuilderInstance is E ... *
•    - function _encodeTokenId(uint256 nifty ...
•    - function _getFinalized(uint256 niftyT ...
•    - function setFinalized(uint256 niftyTy ...
•    - function creator()
•    - function setBaseURI(string memory bas ...
•    - function setNiftyName(uint256 niftyTy ...
•    - function setNiftyIPFSHash(uint256 nif ...
•    - function mintNifty(uint256 niftyType, ...
•  contract BuilderShop is NiftyEntit ...
•    - function setDefaultOwner(address defa ...
•    - function isValidBuilderInstance(addre ...
•    - function createNewBuilderInstance(

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/**
 *Submitted for verification at Etherscan.io on 2023-03-10
*/

// File: contracts/core/NiftyEntity.sol

/**
 * @dev Authenticator of state mutating operations for Nifty Gateway contracts. 
 *
 * addresses for stateful operations. 
 *
 * Rinkeby: 0xCefBf44ff649B6E0Bc63785699c6F1690b8cF73b
 * Mainnet: 0x6e53130dDfF21E3BC963Ee902005223b9A202106
 */
contract NiftyEntity {
   
   // Address of {NiftyRegistry} contract. 
   address internal immutable niftyRegistryContract;
   
   /**
    * @dev Determines whether accounts are allowed to invoke state mutating operations on child contracts.
    */
    modifier onlyValidSender() {
        NiftyRegistry niftyRegistry = NiftyRegistry(niftyRegistryContract);
        bool isValid = niftyRegistry.isValidNiftySender(msg.sender);
        require(isValid, "NiftyEntity: Invalid msg.sender");
        _;
    }
    
   /**
    * @param _niftyRegistryContract Points to the repository of authenticated
    */
    constructor(address _niftyRegistryContract) {
        niftyRegistryContract = _niftyRegistryContract;
    }
}

/**
 * @dev Defined to mediate interaction with externally deployed {NiftyRegistry} dependency. 
 */
interface NiftyRegistry {
   function isValidNiftySender(address sending_key) external view returns (bool);
}

// File: contracts/interface/IERC165.sol

/**
 * @title IERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
interface IERC165 {

  /**
   * @notice Query if a contract implements an interface
   * @param interfaceId The interface identifier, as specified in ERC-165
   * @dev Interface identification is specified in ERC-165. This function
   * uses less than 30,000 gas.
   */
  function supportsInterface(bytes4 interfaceId)
    external
    view
    returns (bool);
}

// File: contracts/interface/IERC721.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: contracts/interface/IERC721Receiver.sol

/**
 * @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: contracts/interface/IERC721Metadata.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: contracts/util/Context.sol

/*
 * @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;
    }
}

// File: contracts/util/Strings.sol

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

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

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

}

// File: contracts/standard/ERC165.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: contracts/core/ERC721.sol

/**
 * @dev Nifty Gateway implementation of Non-Fungible Token Standard.
 */
contract ERC721 is NiftyEntity, Context, ERC165, IERC721, IERC721Metadata {

    // Tracked individual instance spawned by {BuilderShop} contract. 
    uint immutable public _id;

    // Number of distinct NFTs housed in this contract. 
    uint immutable public _typeCount;

    // Intial receiver of all newly minted NFTs.
    address immutable public _defaultOwner;

    // Component(s) of 'tokenId' calculation. 
    uint immutable internal topLevelMultiplier;
    uint immutable internal midLevelMultiplier;

    // Token name.
    string private _name;

    // Token symbol.
    string private _symbol;

    // Token artifact location.
    string private _baseURI;

    // Mapping from Nifty type to name of token.
    mapping(uint256 => string) private _niftyTypeName;

    // Mapping from Nifty type to IPFS hash of canonical artifcat file.
    mapping(uint256 => string) private _niftyTypeIPFSHashes;

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

    // Mapping owner address to token count, by aggregating all _typeCount NFTs in the contact.
    mapping (address => uint256) internal _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 token collection.
     *
     * @param name_ Of the collection being deployed.
     * @param symbol_ Shorthand token identifier, for wallets, etc.
     * @param id_ Number instance deployed by {BuilderShop} contract.
     * @param baseURI_ The location where the artifact assets are stored.
     * @param typeCount_ The number of different Nifty types (different 
     * individual NFTs) associated with the deployed collection.
     * @param defaultOwner_ Intial receiver of all newly minted NFTs.
     * @param niftyRegistryContract Points to the repository of authenticated
     * addresses for stateful operations. 
     */
    constructor(string memory name_, 
                string memory symbol_,
                uint256 id_,
                string memory baseURI_,
                uint256 typeCount_,
                address defaultOwner_, 
                address niftyRegistryContract) NiftyEntity(niftyRegistryContract) {
        _name = name_;
        _symbol = symbol_;
        _id = id_;
        _baseURI = baseURI_;
        _typeCount = typeCount_;
        _defaultOwner = defaultOwner_;

        midLevelMultiplier = 10000;
        topLevelMultiplier = id_ * 100000000;
    }

    /**
     * @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 Returns the link to artificat location for a given token by 'tokenId'.
     * Throws if the token ID does not exist. May return an empty string.
     * @param tokenId uint256 ID of the token to query.
     * @return The location where the artifact assets are stored.
     */
    function tokenURI(uint256 tokenId) external view override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        string memory tokenIdStr = Strings.toString(tokenId);
        return string(abi.encodePacked(_baseURI, tokenIdStr));
    }

    /**
     * @dev Returns an IPFS hash for a given token ID.
     * Throws if the token ID does not exist. May return an empty string.
     * @param tokenId uint256 ID of the token to query.
     * @return IPFS hash for this (_typeCount) NFT. 
     */
    function tokenIPFSHash(uint256 tokenId) external view returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: IPFS hash query for nonexistent token");
        uint256 niftyType = _getNiftyTypeId(tokenId);
        return _niftyTypeIPFSHashes[niftyType];
    }
    
    /**
     * @dev Determine which NFT in the contract (_typeCount) is associated 
     * with this 'tokenId'.
     */
    function _getNiftyTypeId(uint256 tokenId) private view returns (uint256) {
        return (tokenId - topLevelMultiplier) / midLevelMultiplier;
    }

    /**
     * @dev Returns the Name for a given token ID.
     * Throws if the token ID does not exist. May return an empty string.
     * @param tokenId uint256 ID of the token to query
     */
    function tokenName(uint256 tokenId) external view returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: Name query for nonexistent token");
        uint256 niftyType = _getNiftyTypeId(tokenId);
        return _niftyTypeName[niftyType];
    }
   
    /**
     * @dev Internal function to set the token IPFS hash for a nifty type.
     * @param niftyType uint256 ID component of the token to set its IPFS hash
     * @param ipfs_hash string IPFS link to assign
     */
    function _setTokenIPFSHashNiftyType(uint256 niftyType, string memory ipfs_hash) internal {
        require(bytes(_niftyTypeIPFSHashes[niftyType]).length == 0, "ERC721Metadata: IPFS hash already set");
        _niftyTypeIPFSHashes[niftyType] = ipfs_hash;
    }

    /**
     * @dev Internal function to set the name for a nifty type.
     * @param niftyType uint256 of nifty type name to be set
     * @param nifty_type_name name of nifty type
     */
    function _setNiftyTypeName(uint256 niftyType, string memory nifty_type_name) internal {
        _niftyTypeName[niftyType] = nifty_type_name;
    }

    /**
     * @dev Base URI for computing {tokenURI}.
     */
    function _setBaseURI(string memory baseURI_) internal {
        _baseURI = baseURI_;
    }

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

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

        _approve(to, tokenId);
    }

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

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

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

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

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

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

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

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

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

    /**
     * @dev 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);

        // 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");

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

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

        emit Transfer(from, to, tokenId);
    }

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

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (isContract(to)) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

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

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

// File: contracts/standard/ERC721Burnable.sol

/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be irreversibly burned (destroyed).
 */
abstract contract ERC721Burnable is Context, ERC721 {
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
        _burn(tokenId);
    }
}

// File: contracts/core/NiftyBuilderInstance.sol

/** 
 * XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 * XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  .***   XXXXXXXXXXXXXXXXXX
 * XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  ,*********  XXXXXXXXXXXXXXXX
 * XXXXXXXXXXXXXXXXXXXXXXXXXXXX  ***************  XXXXXXXXXXXXX
 * XXXXXXXXXXXXXXXXXXXXXXXXX  .*******************  XXXXXXXXXXX
 * XXXXXXXXXXXXXXXXXXXXXXX  ***********    **********  XXXXXXXX
 * XXXXXXXXXXXXXXXXXXXX   ***********       ***********  XXXXXX
 * XXXXXXXXXXXXXXXXXX  ***********         ***************  XXX
 * XXXXXXXXXXXXXXXX  ***********           ****    ********* XX
 * XXXXXXXXXXXXXXXX *********      ***    ***      *********  X
 * XXXXXXXXXXXXXXXX  **********  *****          *********** XXX
 * XXXXXXXXXXXX   /////.*************         ***********  XXXX
 * XXXXXXXXX  /////////...***********      ************  XXXXXX
 * XXXXXXX/ ///////////..... /////////   ///////////   XXXXXXXX
 * XXXXXX  /    //////.........///////////////////   XXXXXXXXXX
 * XXXXXXXXXX .///////...........//////////////   XXXXXXXXXXXXX
 * XXXXXXXXX .///////.....//..////  /////////  XXXXXXXXXXXXXXXX
 * XXXXXXX# /////////////////////  XXXXXXXXXXXXXXXXXXXXXXXXXXXX
 * XXXXX   ////////////////////   XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 * XX   ////////////// //////   XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 * XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 *
 * @dev Nifty Gateway extension of customized NFT contract, encapsulates
 * logic for minting new tokens, and concluding the minting process. 
 */
contract NiftyBuilderInstance is ERC721, ERC721Burnable {

    // The artist associated with the collection.
    string private _creator;

    // Number of NFTs minted for a given 'typeCount'. 
    mapping (uint256 => uint256) public _mintCount;

    /**
     * @dev Serves as a gas cost optimized boolean flag 
     * to indicate whether the minting process has been 
     * concluded for a given 'typeCount', correspinds 
     * to the {_getFinalized} and {setFinalized}.
     */
    mapping (uint256 => bytes32) private _finalized;

    /**
     * @dev Emitted when tokens are created.
     */
    event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed fromAddress, address indexed toAddress);

    /**
     * @dev Ultimate instantiation of a Nifty Gateway NFT collection. 
     * 
     * @param name Of the collection being deployed.
     * @param symbol Shorthand token identifier, for wallets, etc.
     * @param id Number instance deployed by {BuilderShop} contract.
     * @param typeCount The number of different Nifty types (different 
     * individual NFTs) associated with the deployed collection.
     * @param baseURI The location where the artifact assets are stored.
     * @param creator_ The artist associated with the collection.
     * @param niftyRegistryContract Points to the repository of authenticated
     * addresses for stateful operations. 
     * @param defaultOwner Intial receiver of all newly minted NFTs.
     */
    constructor(
        string memory name,
        string memory symbol,
        uint256 id,
        uint256 typeCount,
        string memory baseURI,
        string memory creator_,
        address niftyRegistryContract,
        address defaultOwner) ERC721(name, symbol, id, baseURI, typeCount, defaultOwner, niftyRegistryContract) {

        _creator = creator_;
    }

    /**
     * @dev Generate canonical Nifty Gateway token representation. 
     * Nifty contracts have a data model called a 'niftyType' (typeCount) 
     * The 'niftyType' refers to a specific nifty in our contract, note 
     * that it gives no information about the edition size. In a given 
     * contract, 'niftyType' 1 could be an edition of 10, while 'niftyType' 
     * 2 is a 1/1, etc.
     * The token IDs are encoded as follows: {id}{niftyType}{edition #}
     * 'niftyType' has 4 digits, and edition number does as well, to allow 
     * for 9999 possible 'niftyType' and 9999 of each edition in each contract.
     * Example token id: [500010270]
     * This is from contract #5, it is 'niftyType' 1 in the contract, and it is 
     * edition #270 of 'niftyType' 1.
     */
    function _encodeTokenId(uint256 niftyType, uint256 tokenNumber) private view returns (uint256) {
        return (topLevelMultiplier + (niftyType * midLevelMultiplier) + tokenNumber);
    }

    /**
     * @dev Determine whether it is possible to mint additional NFTs for this 'niftyType'.
     */
    function _getFinalized(uint256 niftyType) public view returns (bool) {
        bytes32 chunk = _finalized[niftyType / 256];
        return (chunk & bytes32(1 << (niftyType % 256))) != 0x0;
    }

    /**
     * @dev Prevent the minting of additional NFTs of this 'niftyType'.
     */
    function setFinalized(uint256 niftyType) public onlyValidSender {
        uint256 quotient = niftyType / 256;
        bytes32 chunk = _finalized[quotient];
        _finalized[quotient] = chunk | bytes32(1 << (niftyType % 256));
    }

    /**
     * @dev The artist of this collection.
     */
    function creator() public view virtual returns (string memory) {
        return _creator;
    }

    /**
     * @dev Assign the root location where the artifact assets are stored.
     */
    function setBaseURI(string memory baseURI) public onlyValidSender {
        _setBaseURI(baseURI);
    }

    /**
     * @dev Allow owner to change nifty name, by 'niftyType'.
     */
    function setNiftyName(uint256 niftyType, string memory niftyName) public onlyValidSender {
        _setNiftyTypeName(niftyType, niftyName);
    }

    /**
     * @dev Assign the IPFS hash of canonical artifcat file, by 'niftyType'.
     */   
    function setNiftyIPFSHash(uint256 niftyType, string memory hashIPFS) public onlyValidSender {
        _setTokenIPFSHashNiftyType(niftyType, hashIPFS);
    }

    /**
     * @dev Create specified number of nifties en masse.
     * Once an NFT collection is spawned by the factory contract, we make calls to set the IPFS
     * hash (above) for each Nifty type in the collection. 
     * Subsequently calls are issued to this function to mint the appropriate number of tokens 
     * for the project.
     */
    function mintNifty(uint256 niftyType, uint256 count) public onlyValidSender {
        require(!_getFinalized(niftyType), "NiftyBuilderInstance: minting concluded for nifty type");
            
        uint256 tokenNumber = _mintCount[niftyType] + 1;
        uint256 tokenId00 = _encodeTokenId(niftyType, tokenNumber);
        uint256 tokenId01 = tokenId00 + count - 1;
        
        for (uint256 tokenId = tokenId00; tokenId <= tokenId01; tokenId++) {
            _owners[tokenId] = _defaultOwner;
        }
        _mintCount[niftyType] += count;
        _balances[_defaultOwner] += count;

        emit ConsecutiveTransfer(tokenId00, tokenId01, address(0), _defaultOwner);
    }

}

// File: contracts/core/BuilderShop.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;



/**
 *   ::::::::::::::::::::::::::::::::::::::::::::
 * ::::::::::::::::::::::::::::::::::::::::::::::::
 * ::::::::::::::::::::::::::::::::::::::::::::::::
 * ::::::::::::NNNNNNNNN:::::::NNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNNNN::::::NNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNNNNN:::::NNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNNNNNN::::NNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNNNNNNN:::NNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNNNNNNNN::NNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNN:NNNNNN:NNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNN::NNNNNNNNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNN:::NNNNNNNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNN::::NNNNNNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNN:::::NNNNNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNN::::::NNNNNNNNNN::::::::::::
 * ::::::::::::NNNNNNNN:::::::NNNNNNNNN::::::::::::
 * ::::::::::::::::::::::::::::::::::::::::::::::::
 * ::::::::::::::::::::::::::::::::::::::::::::::::
 *   ::::::::::::::::::::::::::::::::::::::::::::
 *  
 * @dev Nexus of the Nifty Gateway smartcontract constellation.
 * {BuilderShop} is a factory contract, when a new collection
 * is slated for deployment, a call is made to this factory 
 * contract to create it. 
 */
contract BuilderShop is NiftyEntity {

    /**
     * @dev Tracks the latest {NiftyBuilderInstance} deployment, supplied as constructor 
     * argument. Every time a new contract is deployed from this "master" factory contract, 
     * it is given a contract id that is one higher than the previous contract deployed.
     */
    uint public _id;

    // Provided as a argument to {NiftyBuilderInstance} deployment.
    address public _defaultOwner;

    // Reference for validation of posible {NiftyBuilderInstance} by address.
    mapping (address => bool) public validBuilderInstance;

    // Log the creation of each {NiftyBuilderInstance} deployment. 
    event BuilderInstanceCreated(address instanceAddress, uint id);

    /**
     * @param niftyRegistryContract Points to the mainnet repository of addresses
     * allowed to invoke state mutating operations via the modifier 'onlyValidSender'.
     * @param defaultOwner_ The address to which all tokens are initially minted.
     */
    constructor(address niftyRegistryContract,
                address defaultOwner_) NiftyEntity(niftyRegistryContract) {
        _defaultOwner = defaultOwner_;
    }

    /**
     * @dev Configurable address for defaultOwner.
     * @param defaultOwner account to which newly minted tokens are allocated.
     */ 
    function setDefaultOwner(address defaultOwner) onlyValidSender external {
        _defaultOwner = defaultOwner;
    }

    /**
     * @dev Allow anyone to check if a contract address is a valid nifty gateway contract.
     * @param instanceAddress address of potential spawned {NiftyBuilderInstance}.
     * @return bool whether or not the contract was initialized by this {BuilderShop}.
     */
    function isValidBuilderInstance(address instanceAddress) external view returns (bool) {
        return (validBuilderInstance[instanceAddress]);
    }

    /**
     * @dev Collections on the platform are associated with a call to this 
     * function which will generate a {NiftyBuilderInstance} to house the 
     * NFTs for that particular artist release. 
     * 
     * @param name Of the collection being deployed.
     * @param symbol Shorthand token identifier, for wallets, etc.
     * @param typeCount The number of different Nifty types (different 
     * individual NFTs) associated with the deployed collection.
     * @param baseURI The location where the artifact assets are stored.
     * @param creator The artist associated with the collection.
     */
    function createNewBuilderInstance(
        string memory name,
        string memory symbol,
        uint256 typeCount,
        string memory baseURI,
        string memory creator) external onlyValidSender { 
        
        _id += 1;

        NiftyBuilderInstance instance = new NiftyBuilderInstance(
            name,
            symbol,
            _id,
            typeCount,
            baseURI,
            creator,
            niftyRegistryContract,
            _defaultOwner
        );
        address instanceAddress = address(instance);
        validBuilderInstance[instanceAddress] = true;

        emit BuilderInstanceCreated(instanceAddress, _id);
    }
   
}

• No Contract Security Audit Submitted- Submit Audit Here

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-----Decoded View---------------
Arg [0] : name (string): Destroy To Create Open Editions by Vhils
Arg [1] : symbol (string): DESTROYTOCREATEOPENEDITIONSBYVHILS
Arg [2] : id (uint256): 131
Arg [3] : typeCount (uint256): 2
Arg [4] : baseURI (string): https://api.niftygateway.com/vhilsdestroyopen/
Arg [5] : creator_ (string): Vhils
Arg [6] : niftyRegistryContract (address): 0x6e53130dDfF21E3BC963Ee902005223b9A202106
Arg [7] : defaultOwner (address): 0xE052113bd7D7700d623414a0a4585BCaE754E9d5

-----Encoded View---------------
19 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000160
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000083
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [4] : 00000000000000000000000000000000000000000000000000000000000001c0
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000220
Arg [6] : 0000000000000000000000006e53130ddff21e3bc963ee902005223b9a202106
Arg [7] : 000000000000000000000000e052113bd7d7700d623414a0a4585bcae754e9d5
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000028
Arg [9] : 44657374726f7920546f20437265617465204f70656e2045646974696f6e7320
Arg [10] : 6279205668696c73000000000000000000000000000000000000000000000000
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000022
Arg [12] : 44455354524f59544f4352454154454f50454e45444954494f4e534259564849
Arg [13] : 4c53000000000000000000000000000000000000000000000000000000000000
Arg [14] : 000000000000000000000000000000000000000000000000000000000000002e
Arg [15] : 68747470733a2f2f6170692e6e69667479676174657761792e636f6d2f766869
Arg [16] : 6c7364657374726f796f70656e2f000000000000000000000000000000000000
Arg [17] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [18] : 5668696c73000000000000000000000000000000000000000000000000000000