{
  "language": "Solidity",
  "sources": {
    "contracts/ERC721Storage.sol": {
      "content": "// SPDX-License-Identifier: Unlicense\n// Creator: 0xVeryBased\n\npragma solidity ^0.8.9;\n\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\nimport \"@openzeppelin/contracts/utils/Address.sol\";\nimport \"@openzeppelin/contracts/utils/Strings.sol\";\nimport \"@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol\";\n\ncontract ERC721Storage is Ownable {\n    using Address for address;\n    using Strings for uint256;\n\n    // Tracker for calculating number minted/total supply and assigning token indices\n    uint256 private currentIndex = 0;\n\n    // Token name\n    string private _name;\n\n    // Token symbol\n    string private _symbol;\n\n    // Token owners and token balances\n    mapping(uint256 => address) private _ownerships;\n    mapping(address => uint256) private _balances;\n\n    // Burn address and counter\n    address public immutable burnAddress = 0x000000000000000000000000000000000000dEaD;\n    uint256 private numTokensBurned;\n\n    // Mapping from token ID to approved address\n    mapping(uint256 => address) private _tokenApprovals;\n\n    // Mapping from owner to operator approvals\n    mapping(address => mapping(address => bool)) private _operatorApprovals;\n\n    // Mapping from operators to whether or not they are restricted\n    mapping(address => bool) private _operatorRestrictions;\n    // Bool indicating whether one can still restrict an operator or not\n    bool private _canRestrict;\n\n    ERC721TopLevelProto public topLevelContract;\n\n    constructor(\n        string memory name_,\n        string memory symbol_\n    ) {\n        _name = name_;\n        _symbol = symbol_;\n//        topLevelContract = ERC721TopLevelProto(msg.sender);\n    }\n\n    function setTopLevelContract(address _topLevelContract) public onlyOwner {\n        topLevelContract = ERC721TopLevelProto(_topLevelContract);\n        transferOwnership(_topLevelContract);\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-totalSupply}.\n    **/\n    function storage_totalSupply() public view returns (uint256) {\n        return (currentIndex - numTokensBurned);\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-tokenByIndex}.\n    **/\n    function storage_tokenByIndex(uint256 index) public view returns (uint256) {\n        require(index < storage_totalSupply(), \"g\");\n        require(storage_ownerOf(index) != burnAddress, \"b\");\n        return index;\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n     * This read function is O(totalSupply). If calling from a separate contract, be sure to test gas first.\n     * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.\n    **/\n    function storage_tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {\n        require(index < storage_balanceOf(owner), \"b\");\n        uint256 numMintedSoFar = storage_totalSupply();\n        uint256 tokenIdsIdx = 0;\n        address currOwnershipAddr = address(0);\n        for (uint256 i = 0; i < numMintedSoFar; i++) {\n            address ownership = _ownerships[i];\n            if (ownership != address(0)) {\n                currOwnershipAddr = ownership;\n            }\n            if (currOwnershipAddr == owner) {\n                if (tokenIdsIdx == index) {\n                    return i;\n                }\n                tokenIdsIdx++;\n            }\n        }\n        revert(\"u\");\n    }\n\n    function storage_tokenOfOwnerByIndexStepped(address owner, uint256 index, uint256 lastToken, uint256 lastIndex) public view returns (uint256) {\n        require(index < storage_balanceOf(owner), \"b\");\n        uint256 numTokenIds = currentIndex;\n        uint256 tokenIdsIdx = ((lastIndex == 0) ? 0 : (lastIndex + 1));\n        address currOwnershipAddr = address(0);\n        for (uint256 i = ((lastToken == 0) ? 0 : (lastToken + 1)); i < numTokenIds; i++) {\n            address ownership = _ownerships[i];\n            if (ownership != address(0)) {\n                currOwnershipAddr = ownership;\n            }\n            if (currOwnershipAddr == owner) {\n                if (tokenIdsIdx == index) {\n                    return i;\n                }\n                tokenIdsIdx++;\n            }\n        }\n        revert(\"u\");\n    }\n\n//    /**\n//     * @dev See {IERC165-supportsInterface}.\n//    **/\n//    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {\n//        return (interfaceId == type(IERC721).interfaceId ||\n//        interfaceId == type(IERC721Metadata).interfaceId ||\n//        interfaceId == type(IERC721Enumerable).interfaceId ||\n//        super.supportsInterface(interfaceId));\n//    }\n\n    /**\n     * @dev See {IERC721-balanceOf}.\n    **/\n    function storage_balanceOf(address owner) public view returns (uint256) {\n        require(owner != address(0), \"0\");\n        return uint256(_balances[owner]);\n    }\n\n    /**\n     * @dev See {IERC721-ownerOf}.\n    **/\n    function storage_ownerOf(uint256 tokenId) public view returns (address) {\n        require(tokenId < currentIndex, \"t\");\n\n        for (uint256 curr = tokenId; curr >= 0; curr--) {\n            address ownership = _ownerships[curr];\n            if (ownership != address(0)) {\n                return ownership;\n            }\n        }\n\n        revert(\"o\");\n    }\n\n    /**\n     * @dev See {IERC721Metadata-name}.\n    **/\n    function storage_name() public view virtual returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev See {IERC721Metadata-symbol}.\n    **/\n    function storage_symbol() public view virtual returns (string memory) {\n        return _symbol;\n    }\n\n    /**\n     * @dev See {IERC721-approve}.\n    **/\n    function storage_approve(address to, uint256 tokenId, address msgSender) public onlyOwner {\n        address owner = ERC721Storage.storage_ownerOf(tokenId);\n        require(to != owner, \"o\");\n\n        require(\n            msgSender == owner || storage_isApprovedForAll(owner, msgSender),\n            \"a\"\n        );\n\n        _approve(to, tokenId, owner);\n    }\n\n    /**\n     * @dev See {IERC721-getApproved}.\n    **/\n    function storage_getApproved(uint256 tokenId) public view returns (address) {\n        require(_exists(tokenId), \"a\");\n\n        return _tokenApprovals[tokenId];\n    }\n\n    /**\n     * @dev See {IERC721-setApprovalForAll}.\n    **/\n    function storage_setApprovalForAll(address operator, bool approved, address msgSender) public {\n        //        require(operator != msgSender && !(operatorRestrict[operator]), \"a;r\");\n        require(operator != msgSender, \"a\");\n\n        _operatorApprovals[msgSender][operator] = approved;\n        topLevelContract.emitApprovalForAll(msgSender, operator, approved);\n    }\n\n    /**\n     * @dev See {IERC721-isApprovedForAll}.\n    **/\n    function storage_isApprovedForAll(address owner, address operator) public view virtual returns (bool) {\n        return _operatorApprovals[owner][operator];\n    }\n\n    /**\n     * @dev See {IERC721-transferFrom}.\n    **/\n    function storage_transferFrom(\n        address from,\n        address to,\n        uint256 tokenId,\n        address msgSender\n    ) public onlyOwner {\n        _transfer(from, to, tokenId, msgSender);\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n    **/\n    function storage_safeTransferFrom(\n        address from,\n        address to,\n        uint256 tokenId,\n        address msgSender\n    ) public onlyOwner {\n        storage_safeTransferFrom(from, to, tokenId, \"\", msgSender);\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n    **/\n    function storage_safeTransferFrom(\n        address from,\n        address to,\n        uint256 tokenId,\n        bytes memory _data,\n        address msgSender\n    ) public onlyOwner {\n        _transfer(from, to, tokenId, msgSender);\n        require(\n            _checkOnERC721Received(from, to, tokenId, _data, msgSender),\n            \"z\"\n        );\n    }\n\n    /**\n     * @dev Burns a token to the designated burn address\n    **/\n    function storage_burnToken(uint256 tokenId, address msgSender) public onlyOwner {\n        _transfer(storage_ownerOf(tokenId), burnAddress, tokenId, msgSender);\n        numTokensBurned++;\n    }\n\n    /**\n     * @dev Returns whether `tokenId` exists.\n     *\n     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\n     *\n     * Tokens start existing when they are minted (`_mint`),\n    **/\n    function _exists(uint256 tokenId) internal view returns (bool) {\n        return (tokenId < currentIndex && storage_ownerOf(tokenId) != burnAddress);\n    }\n\n    function storage_exists(uint256 tokenId) public view returns (bool) {\n        return _exists(tokenId);\n    }\n\n    function storage_safeMint(address to, uint256 quantity, address msgSender) public onlyOwner {\n        storage_safeMint(to, quantity, \"\", msgSender);\n    }\n\n    function storage_safeMint(\n        address to,\n        uint256 quantity,\n        bytes memory _data,\n        address msgSender\n    ) public onlyOwner {\n        storage_mint(to, quantity);\n        require(_checkOnERC721Received(address(0), to, currentIndex - 1, _data, msgSender), \"z\");\n    }\n\n    function storage_mint(address to, uint256 quantity) public onlyOwner {\n        uint256 startTokenId = currentIndex;\n        require(to != address(0), \"0\");\n        // We know if the first token in the batch doesn't exist, the other ones don't as well, because of serial ordering.\n        require(!_exists(startTokenId), \"a\");\n\n        _balances[to] = _balances[to] + quantity;\n        _ownerships[startTokenId] = to;\n\n        uint256 updatedIndex = startTokenId;\n\n        for (uint256 i = 0; i < quantity; i++) {\n            topLevelContract.emitTransfer(address(0), to, updatedIndex);\n            updatedIndex++;\n        }\n\n        currentIndex = updatedIndex;\n    }\n\n    function storage_contractURI(string memory _description, string memory _img, string memory _self) public view returns (string memory) {\n        return string(\n            abi.encodePacked(\n                \"data:application/json;utf8,{\\\"name\\\":\\\"\", storage_name(),\"\\\",\",\n                \"\\\"description\\\":\\\"\", _description, \"\\\",\",\n                \"\\\"image\\\":\\\"\", _img, \"\\\",\",\n                \"\\\"external_link\\\":\\\"https://crudeborne.wtf\\\",\",\n                \"\\\"seller_fee_basis_points\\\":420,\\\"fee_recipient\\\":\\\"\",\n                _self, \"\\\"}\"\n            )\n        );\n    }\n\n    function _transfer(\n        address from,\n        address to,\n        uint256 tokenId,\n        address msgSender\n    ) private {\n        address prevOwnership = storage_ownerOf(tokenId);\n\n        bool isApprovedOrOwner = (msgSender == prevOwnership ||\n        storage_getApproved(tokenId) == msgSender ||\n        storage_isApprovedForAll(prevOwnership, msgSender));\n\n        require(isApprovedOrOwner && prevOwnership == from, \"a\");\n        require(prevOwnership == from, \"o\");\n        require(to != address(0), \"0\");\n\n        // Clear approvals from the previous owner\n        _approve(address(0), tokenId, prevOwnership);\n\n        _balances[from] -= 1;\n        _balances[to] += 1;\n        _ownerships[tokenId] = to;\n\n        // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.\n        // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.\n        uint256 nextTokenId = tokenId + 1;\n        if (_ownerships[nextTokenId] == address(0)) {\n            if (_exists(nextTokenId)) {\n                _ownerships[nextTokenId] = prevOwnership;\n            }\n        }\n\n        topLevelContract.emitTransfer(from, to, tokenId);\n    }\n\n    function _approve(\n        address to,\n        uint256 tokenId,\n        address owner\n    ) private {\n        _tokenApprovals[tokenId] = to;\n        topLevelContract.emitApproval(owner, to, tokenId);\n    }\n\n    function _checkOnERC721Received(\n        address from,\n        address to,\n        uint256 tokenId,\n        bytes memory _data,\n        address msgSender\n    ) private returns (bool) {\n        if (to.isContract()) {\n            try IERC721Receiver(to).onERC721Received(msgSender, from, tokenId, _data) returns (bytes4 retVal) {\n                return retVal == IERC721Receiver(to).onERC721Received.selector;\n            } catch (bytes memory reason) {\n                if (reason.length == 0) {\n                    revert(\"z\");\n                } else {\n                    assembly {\n                        revert(add(32, reason), mload(reason))\n                    }\n                }\n            }\n        } else {\n            return true;\n        }\n    }\n}\n\n////////////////////\n\nabstract contract ERC721TopLevelProto {\n    function emitTransfer(address from, address to, uint256 tokenId) public virtual;\n    function emitApproval(address owner, address approved, uint256 tokenId) public virtual;\n    function emitApprovalForAll(address owner, address operator, bool approved) public virtual;\n}\n\n////////////////////////////////////////\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
    },
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    constructor() {\n        _transferOwnership(_msgSender());\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        _checkOwner();\n        _;\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if the sender is not the owner.\n     */\n    function _checkOwner() internal view virtual {\n        require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions anymore. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby removing any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        _transferOwnership(address(0));\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        _transferOwnership(newOwner);\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Internal function without access restriction.\n     */\n    function _transferOwnership(address newOwner) internal virtual {\n        address oldOwner = _owner;\n        _owner = newOwner;\n        emit OwnershipTransferred(oldOwner, newOwner);\n    }\n}\n"
    },
    "@openzeppelin/contracts/utils/Address.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     * ====\n     *\n     * [IMPORTANT]\n     * ====\n     * You shouldn't rely on `isContract` to protect against flash loan attacks!\n     *\n     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n     * constructor.\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize/address.code.length, which returns 0\n        // for contracts in construction, since the code is only stored at the end\n        // of the constructor execution.\n\n        return account.code.length > 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain `call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionCall(target, data, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(address(this).balance >= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal view returns (bytes memory) {\n        require(isContract(target), \"Address: static call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.staticcall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(isContract(target), \"Address: delegate call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.delegatecall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the\n     * revert reason using the provided one.\n     *\n     * _Available since v4.3._\n     */\n    function verifyCallResult(\n        bool success,\n        bytes memory returndata,\n        string memory errorMessage\n    ) internal pure returns (bytes memory) {\n        if (success) {\n            return returndata;\n        } else {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length > 0) {\n                // The easiest way to bubble the revert reason is using memory via assembly\n                /// @solidity memory-safe-assembly\n                assembly {\n                    let returndata_size := mload(returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert(errorMessage);\n            }\n        }\n    }\n}\n"
    },
    "@openzeppelin/contracts/utils/Strings.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n    bytes16 private constant _HEX_SYMBOLS = \"0123456789abcdef\";\n    uint8 private constant _ADDRESS_LENGTH = 20;\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` decimal representation.\n     */\n    function toString(uint256 value) internal pure returns (string memory) {\n        // Inspired by OraclizeAPI's implementation - MIT licence\n        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\n\n        if (value == 0) {\n            return \"0\";\n        }\n        uint256 temp = value;\n        uint256 digits;\n        while (temp != 0) {\n            digits++;\n            temp /= 10;\n        }\n        bytes memory buffer = new bytes(digits);\n        while (value != 0) {\n            digits -= 1;\n            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\n            value /= 10;\n        }\n        return string(buffer);\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\n     */\n    function toHexString(uint256 value) internal pure returns (string memory) {\n        if (value == 0) {\n            return \"0x00\";\n        }\n        uint256 temp = value;\n        uint256 length = 0;\n        while (temp != 0) {\n            length++;\n            temp >>= 8;\n        }\n        return toHexString(value, length);\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n     */\n    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\n        bytes memory buffer = new bytes(2 * length + 2);\n        buffer[0] = \"0\";\n        buffer[1] = \"x\";\n        for (uint256 i = 2 * length + 1; i > 1; --i) {\n            buffer[i] = _HEX_SYMBOLS[value & 0xf];\n            value >>= 4;\n        }\n        require(value == 0, \"Strings: hex length insufficient\");\n        return string(buffer);\n    }\n\n    /**\n     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.\n     */\n    function toHexString(address addr) internal pure returns (string memory) {\n        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);\n    }\n}\n"
    },
    "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n    /**\n     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n     * by `operator` from `from`, this function is called.\n     *\n     * It must return its Solidity selector to confirm the token transfer.\n     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.\n     *\n     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.\n     */\n    function onERC721Received(\n        address operator,\n        address from,\n        uint256 tokenId,\n        bytes calldata data\n    ) external returns (bytes4);\n}\n"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes calldata) {\n        return msg.data;\n    }\n}\n"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "libraries": {}
  }
}