// ##############################################################
// ##############################################################
// ##############################################################
// ######"          ""### "" "###################################
// ####                        ##### ------------------------- ##
// #### ........              ###### ACTUAL            GENESIS ##
// ###########"             ######## BY           NEU × REGIME ##
// ########"        .      #########                           ##
// ######       .###        ########    https://actual.gallery ##
// #####        ####        "#######            @actualgallery ##
// ####       #####          "######                           ##
// ###         ""              #####        https://neuregi.me ##
// ###               #          "###               @neuxregime ##
// ###.           .#####.       .### ------------------------- ##
// #####........#########......##################################
// ##############################################################
// ##############################################################
// ##     "NEVER BEFORE HAS THERE BEEN SO MUCH LIGHT" - M.     ##
// ##############################################################
// ##############################################################

// SPDX-License-Identifier: Unlicensed

// Sources flattened with hardhat v2.8.0 https://hardhat.org

// File @openzeppelin/contracts/utils/introspection/IERC165.sol@v4.4.1

// 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 @openzeppelin/contracts/token/ERC721/IERC721.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

/**
 * @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 @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
  /**
   * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
   * by `operator` from `from`, this function is called.
   *
   * It must return its Solidity selector to confirm the token transfer.
   * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
   *
   * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
   */
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external returns (bytes4);
}

// File @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

/**
 * @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 @openzeppelin/contracts/utils/Address.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
  /**
   * @dev Returns true if `account` is a contract.
   *
   * [IMPORTANT]
   * ====
   * It is unsafe to assume that an address for which this function returns
   * false is an externally-owned account (EOA) and not a contract.
   *
   * Among others, `isContract` will return false for the following
   * types of addresses:
   *
   *  - an externally-owned account
   *  - a contract in construction
   *  - an address where a contract will be created
   *  - an address where a contract lived, but was destroyed
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // This method relies on extcodesize, which returns 0 for contracts in
    // construction, since the code is only stored at the end of the
    // constructor execution.

    uint256 size;
    assembly {
      size := extcodesize(account)
    }
    return size > 0;
  }

  /**
   * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
   * `recipient`, forwarding all available gas and reverting on errors.
   *
   * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
   * of certain opcodes, possibly making contracts go over the 2300 gas limit
   * imposed by `transfer`, making them unable to receive funds via
   * `transfer`. {sendValue} removes this limitation.
   *
   * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
   *
   * IMPORTANT: because control is transferred to `recipient`, care must be
   * taken to not create reentrancy vulnerabilities. Consider using
   * {ReentrancyGuard} or the
   * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
   */
  function sendValue(address payable recipient, uint256 amount) internal {
    require(address(this).balance >= amount, 'Address: insufficient balance');

    (bool success, ) = recipient.call{value: amount}('');
    require(
      success,
      'Address: unable to send value, recipient may have reverted'
    );
  }

  /**
   * @dev Performs a Solidity function call using a low level `call`. A
   * plain `call` is an unsafe replacement for a function call: use this
   * function instead.
   *
   * If `target` reverts with a revert reason, it is bubbled up by this
   * function (like regular Solidity function calls).
   *
   * Returns the raw returned data. To convert to the expected return value,
   * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
   *
   * Requirements:
   *
   * - `target` must be a contract.
   * - calling `target` with `data` must not revert.
   *
   * _Available since v3.1._
   */
  function functionCall(address target, bytes memory data)
    internal
    returns (bytes memory)
  {
    return functionCall(target, data, 'Address: low-level call failed');
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
   * `errorMessage` as a fallback revert reason when `target` reverts.
   *
   * _Available since v3.1._
   */
  function functionCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal returns (bytes memory) {
    return functionCallWithValue(target, data, 0, errorMessage);
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
   * but also transferring `value` wei to `target`.
   *
   * Requirements:
   *
   * - the calling contract must have an ETH balance of at least `value`.
   * - the called Solidity function must be `payable`.
   *
   * _Available since v3.1._
   */
  function functionCallWithValue(
    address target,
    bytes memory data,
    uint256 value
  ) internal returns (bytes memory) {
    return
      functionCallWithValue(
        target,
        data,
        value,
        'Address: low-level call with value failed'
      );
  }

  /**
   * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
   * with `errorMessage` as a fallback revert reason when `target` reverts.
   *
   * _Available since v3.1._
   */
  function functionCallWithValue(
    address target,
    bytes memory data,
    uint256 value,
    string memory errorMessage
  ) internal returns (bytes memory) {
    require(
      address(this).balance >= value,
      'Address: insufficient balance for call'
    );
    require(isContract(target), 'Address: call to non-contract');

    (bool success, bytes memory returndata) = target.call{value: value}(data);
    return verifyCallResult(success, returndata, errorMessage);
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
   * but performing a static call.
   *
   * _Available since v3.3._
   */
  function functionStaticCall(address target, bytes memory data)
    internal
    view
    returns (bytes memory)
  {
    return
      functionStaticCall(target, data, 'Address: low-level static call failed');
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
   * but performing a static call.
   *
   * _Available since v3.3._
   */
  function functionStaticCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal view returns (bytes memory) {
    require(isContract(target), 'Address: static call to non-contract');

    (bool success, bytes memory returndata) = target.staticcall(data);
    return verifyCallResult(success, returndata, errorMessage);
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
   * but performing a delegate call.
   *
   * _Available since v3.4._
   */
  function functionDelegateCall(address target, bytes memory data)
    internal
    returns (bytes memory)
  {
    return
      functionDelegateCall(
        target,
        data,
        'Address: low-level delegate call failed'
      );
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
   * but performing a delegate call.
   *
   * _Available since v3.4._
   */
  function functionDelegateCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal returns (bytes memory) {
    require(isContract(target), 'Address: delegate call to non-contract');

    (bool success, bytes memory returndata) = target.delegatecall(data);
    return verifyCallResult(success, returndata, errorMessage);
  }

  /**
   * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
   * revert reason using the provided one.
   *
   * _Available since v4.3._
   */
  function verifyCallResult(
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal pure returns (bytes memory) {
    if (success) {
      return returndata;
    } else {
      // Look for revert reason and bubble it up if present
      if (returndata.length > 0) {
        // The easiest way to bubble the revert reason is using memory via assembly

        assembly {
          let returndata_size := mload(returndata)
          revert(add(32, returndata), returndata_size)
        }
      } else {
        revert(errorMessage);
      }
    }
  }
}

// File @openzeppelin/contracts/utils/Context.sol@v4.4.1

// 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 @openzeppelin/contracts/utils/Strings.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
  bytes16 private constant _HEX_SYMBOLS = '0123456789abcdef';

  /**
   * @dev Converts a `uint256` to its ASCII `string` decimal representation.
   */
  function toString(uint256 value) internal pure returns (string memory) {
    // Inspired by OraclizeAPI's implementation - MIT licence
    // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

    if (value == 0) {
      return '0';
    }
    uint256 temp = value;
    uint256 digits;
    while (temp != 0) {
      digits++;
      temp /= 10;
    }
    bytes memory buffer = new bytes(digits);
    while (value != 0) {
      digits -= 1;
      buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
      value /= 10;
    }
    return string(buffer);
  }

  /**
   * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
   */
  function toHexString(uint256 value) internal pure returns (string memory) {
    if (value == 0) {
      return '0x00';
    }
    uint256 temp = value;
    uint256 length = 0;
    while (temp != 0) {
      length++;
      temp >>= 8;
    }
    return toHexString(value, length);
  }

  /**
   * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
   */
  function toHexString(uint256 value, uint256 length)
    internal
    pure
    returns (string memory)
  {
    bytes memory buffer = new bytes(2 * length + 2);
    buffer[0] = '0';
    buffer[1] = 'x';
    for (uint256 i = 2 * length + 1; i > 1; --i) {
      buffer[i] = _HEX_SYMBOLS[value & 0xf];
      value >>= 4;
    }
    require(value == 0, 'Strings: hex length insufficient');
    return string(buffer);
  }
}

// File @openzeppelin/contracts/utils/introspection/ERC165.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

/**
 * @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 @openzeppelin/contracts/token/ERC721/ERC721.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
  using Address for address;
  using Strings for uint256;

  // Token name
  string private _name;

  // Token symbol
  string private _symbol;

  // Mapping from token ID to owner address
  mapping(uint256 => address) private _owners;

  // Mapping owner address to token count
  mapping(address => uint256) private _balances;

  // Mapping from token ID to approved address
  mapping(uint256 => address) private _tokenApprovals;

  // Mapping from owner to operator approvals
  mapping(address => mapping(address => bool)) private _operatorApprovals;

  /**
   * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
   */
  constructor(string memory name_, string memory symbol_) {
    _name = name_;
    _symbol = symbol_;
  }

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override(ERC165, IERC165)
    returns (bool)
  {
    return
      interfaceId == type(IERC721).interfaceId ||
      interfaceId == type(IERC721Metadata).interfaceId ||
      super.supportsInterface(interfaceId);
  }

  /**
   * @dev See {IERC721-balanceOf}.
   */
  function balanceOf(address owner)
    public
    view
    virtual
    override
    returns (uint256)
  {
    require(owner != address(0), 'ERC721: balance query for the zero address');
    return _balances[owner];
  }

  /**
   * @dev See {IERC721-ownerOf}.
   */
  function ownerOf(uint256 tokenId)
    public
    view
    virtual
    override
    returns (address)
  {
    address owner = _owners[tokenId];
    require(owner != address(0), 'ERC721: owner query for nonexistent token');
    return owner;
  }

  /**
   * @dev See {IERC721Metadata-name}.
   */
  function name() public view virtual override returns (string memory) {
    return _name;
  }

  /**
   * @dev See {IERC721Metadata-symbol}.
   */
  function symbol() public view virtual override returns (string memory) {
    return _symbol;
  }

  /**
   * @dev See {IERC721Metadata-tokenURI}.
   */
  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)
  {
    require(
      _exists(tokenId),
      'ERC721Metadata: URI query for nonexistent token'
    );

    string memory baseURI = _baseURI();
    return
      bytes(baseURI).length > 0
        ? string(abi.encodePacked(baseURI, tokenId.toString()))
        : '';
  }

  /**
   * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
   * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
   * by default, can be overriden in child contracts.
   */
  function _baseURI() internal view virtual returns (string memory) {
    return '';
  }

  /**
   * @dev See {IERC721-approve}.
   */
  function approve(address to, uint256 tokenId) public virtual override {
    address owner = ERC721.ownerOf(tokenId);
    require(to != owner, 'ERC721: approval to current owner');

    require(
      _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
      'ERC721: approve caller is not owner nor approved for all'
    );

    _approve(to, tokenId);
  }

  /**
   * @dev See {IERC721-getApproved}.
   */
  function getApproved(uint256 tokenId)
    public
    view
    virtual
    override
    returns (address)
  {
    require(_exists(tokenId), 'ERC721: approved query for nonexistent token');

    return _tokenApprovals[tokenId];
  }

  /**
   * @dev See {IERC721-setApprovalForAll}.
   */
  function setApprovalForAll(address operator, bool approved)
    public
    virtual
    override
  {
    _setApprovalForAll(_msgSender(), operator, approved);
  }

  /**
   * @dev See {IERC721-isApprovedForAll}.
   */
  function isApprovedForAll(address owner, address operator)
    public
    view
    virtual
    override
    returns (bool)
  {
    return _operatorApprovals[owner][operator];
  }

  /**
   * @dev See {IERC721-transferFrom}.
   */
  function transferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public virtual override {
    //solhint-disable-next-line max-line-length
    require(
      _isApprovedOrOwner(_msgSender(), tokenId),
      'ERC721: transfer caller is not owner nor approved'
    );

    _transfer(from, to, tokenId);
  }

  /**
   * @dev See {IERC721-safeTransferFrom}.
   */
  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public virtual override {
    safeTransferFrom(from, to, tokenId, '');
  }

  /**
   * @dev See {IERC721-safeTransferFrom}.
   */
  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId,
    bytes memory _data
  ) public virtual override {
    require(
      _isApprovedOrOwner(_msgSender(), tokenId),
      'ERC721: transfer caller is not owner nor approved'
    );
    _safeTransfer(from, to, tokenId, _data);
  }

  /**
   * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
   * are aware of the ERC721 protocol to prevent tokens from being forever locked.
   *
   * `_data` is additional data, it has no specified format and it is sent in call to `to`.
   *
   * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
   * implement alternative mechanisms to perform token transfer, such as signature-based.
   *
   * Requirements:
   *
   * - `from` cannot be the zero address.
   * - `to` cannot be the zero address.
   * - `tokenId` token must exist and be owned by `from`.
   * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
   *
   * Emits a {Transfer} event.
   */
  function _safeTransfer(
    address from,
    address to,
    uint256 tokenId,
    bytes memory _data
  ) internal virtual {
    _transfer(from, to, tokenId);
    require(
      _checkOnERC721Received(from, to, tokenId, _data),
      'ERC721: transfer to non ERC721Receiver implementer'
    );
  }

  /**
   * @dev Returns whether `tokenId` exists.
   *
   * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
   *
   * Tokens start existing when they are minted (`_mint`),
   * and stop existing when they are burned (`_burn`).
   */
  function _exists(uint256 tokenId) internal view virtual returns (bool) {
    return _owners[tokenId] != address(0);
  }

  /**
   * @dev Returns whether `spender` is allowed to manage `tokenId`.
   *
   * Requirements:
   *
   * - `tokenId` must exist.
   */
  function _isApprovedOrOwner(address spender, uint256 tokenId)
    internal
    view
    virtual
    returns (bool)
  {
    require(_exists(tokenId), 'ERC721: operator query for nonexistent token');
    address owner = ERC721.ownerOf(tokenId);
    return (spender == owner ||
      getApproved(tokenId) == spender ||
      isApprovedForAll(owner, spender));
  }

  /**
   * @dev Safely mints `tokenId` and transfers it to `to`.
   *
   * Requirements:
   *
   * - `tokenId` must not exist.
   * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
   *
   * Emits a {Transfer} event.
   */
  function _safeMint(address to, uint256 tokenId) internal virtual {
    _safeMint(to, tokenId, '');
  }

  /**
   * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
   * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
   */
  function _safeMint(
    address to,
    uint256 tokenId,
    bytes memory _data
  ) internal virtual {
    _mint(to, tokenId);
    require(
      _checkOnERC721Received(address(0), to, tokenId, _data),
      'ERC721: transfer to non ERC721Receiver implementer'
    );
  }

  /**
   * @dev Mints `tokenId` and transfers it to `to`.
   *
   * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
   *
   * Requirements:
   *
   * - `tokenId` must not exist.
   * - `to` cannot be the zero address.
   *
   * Emits a {Transfer} event.
   */
  function _mint(address to, uint256 tokenId) internal virtual {
    require(to != address(0), 'ERC721: mint to the zero address');
    require(!_exists(tokenId), 'ERC721: token already minted');

    _beforeTokenTransfer(address(0), to, tokenId);

    _balances[to] += 1;
    _owners[tokenId] = to;

    emit Transfer(address(0), to, tokenId);
  }

  /**
   * @dev Destroys `tokenId`.
   * The approval is cleared when the token is burned.
   *
   * Requirements:
   *
   * - `tokenId` must exist.
   *
   * Emits a {Transfer} event.
   */
  function _burn(uint256 tokenId) internal virtual {
    address owner = ERC721.ownerOf(tokenId);

    _beforeTokenTransfer(owner, address(0), tokenId);

    // Clear approvals
    _approve(address(0), tokenId);

    _balances[owner] -= 1;
    delete _owners[tokenId];

    emit Transfer(owner, address(0), tokenId);
  }

  /**
   * @dev Transfers `tokenId` from `from` to `to`.
   *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
   *
   * Requirements:
   *
   * - `to` cannot be the zero address.
   * - `tokenId` token must be owned by `from`.
   *
   * Emits a {Transfer} event.
   */
  function _transfer(
    address from,
    address to,
    uint256 tokenId
  ) internal virtual {
    require(
      ERC721.ownerOf(tokenId) == from,
      'ERC721: transfer of token that is not own'
    );
    require(to != address(0), 'ERC721: transfer to the zero address');

    _beforeTokenTransfer(from, to, tokenId);

    // Clear approvals from the previous owner
    _approve(address(0), tokenId);

    _balances[from] -= 1;
    _balances[to] += 1;
    _owners[tokenId] = to;

    emit Transfer(from, to, tokenId);
  }

  /**
   * @dev Approve `to` to operate on `tokenId`
   *
   * Emits a {Approval} event.
   */
  function _approve(address to, uint256 tokenId) internal virtual {
    _tokenApprovals[tokenId] = to;
    emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
  }

  /**
   * @dev Approve `operator` to operate on all of `owner` tokens
   *
   * Emits a {ApprovalForAll} event.
   */
  function _setApprovalForAll(
    address owner,
    address operator,
    bool approved
  ) internal virtual {
    require(owner != operator, 'ERC721: approve to caller');
    _operatorApprovals[owner][operator] = approved;
    emit ApprovalForAll(owner, operator, approved);
  }

  /**
   * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
   * The call is not executed if the target address is not a contract.
   *
   * @param from address representing the previous owner of the given token ID
   * @param to target address that will receive the tokens
   * @param tokenId uint256 ID of the token to be transferred
   * @param _data bytes optional data to send along with the call
   * @return bool whether the call correctly returned the expected magic value
   */
  function _checkOnERC721Received(
    address from,
    address to,
    uint256 tokenId,
    bytes memory _data
  ) private returns (bool) {
    if (to.isContract()) {
      try
        IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data)
      returns (bytes4 retval) {
        return retval == IERC721Receiver.onERC721Received.selector;
      } catch (bytes memory reason) {
        if (reason.length == 0) {
          revert('ERC721: transfer to non ERC721Receiver implementer');
        } else {
          assembly {
            revert(add(32, reason), mload(reason))
          }
        }
      }
    } else {
      return true;
    }
  }

  /**
   * @dev Hook that is called before any token transfer. This includes minting
   * and burning.
   *
   * Calling conditions:
   *
   * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
   * transferred to `to`.
   * - When `from` is zero, `tokenId` will be minted for `to`.
   * - When `to` is zero, ``from``'s `tokenId` will be burned.
   * - `from` and `to` are never both zero.
   *
   * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
   */
  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 tokenId
  ) internal virtual {}
}

// File @openzeppelin/contracts/access/Ownable.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
  address private _owner;

  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );

  /**
   * @dev Initializes the contract setting the deployer as the initial owner.
   */
  constructor() {
    _transferOwnership(_msgSender());
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() public view virtual returns (address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(owner() == _msgSender(), 'Ownable: caller is not the owner');
    _;
  }

  /**
   * @dev Leaves the contract without owner. It will not be possible to call
   * `onlyOwner` functions anymore. Can only be called by the current owner.
   *
   * NOTE: Renouncing ownership will leave the contract without an owner,
   * thereby removing any functionality that is only available to the owner.
   */
  function renounceOwnership() public virtual onlyOwner {
    _transferOwnership(address(0));
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Can only be called by the current owner.
   */
  function transferOwnership(address newOwner) public virtual onlyOwner {
    require(newOwner != address(0), 'Ownable: new owner is the zero address');
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Internal function without access restriction.
   */
  function _transferOwnership(address newOwner) internal virtual {
    address oldOwner = _owner;
    _owner = newOwner;
    emit OwnershipTransferred(oldOwner, newOwner);
  }
}

// File @openzeppelin/contracts/utils/cryptography/ECDSA.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
  enum RecoverError {
    NoError,
    InvalidSignature,
    InvalidSignatureLength,
    InvalidSignatureS,
    InvalidSignatureV
  }

  function _throwError(RecoverError error) private pure {
    if (error == RecoverError.NoError) {
      return; // no error: do nothing
    } else if (error == RecoverError.InvalidSignature) {
      revert('ECDSA: invalid signature');
    } else if (error == RecoverError.InvalidSignatureLength) {
      revert('ECDSA: invalid signature length');
    } else if (error == RecoverError.InvalidSignatureS) {
      revert("ECDSA: invalid signature 's' value");
    } else if (error == RecoverError.InvalidSignatureV) {
      revert("ECDSA: invalid signature 'v' value");
    }
  }

  /**
   * @dev Returns the address that signed a hashed message (`hash`) with
   * `signature` or error string. This address can then be used for verification purposes.
   *
   * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
   * this function rejects them by requiring the `s` value to be in the lower
   * half order, and the `v` value to be either 27 or 28.
   *
   * IMPORTANT: `hash` _must_ be the result of a hash operation for the
   * verification to be secure: it is possible to craft signatures that
   * recover to arbitrary addresses for non-hashed data. A safe way to ensure
   * this is by receiving a hash of the original message (which may otherwise
   * be too long), and then calling {toEthSignedMessageHash} on it.
   *
   * Documentation for signature generation:
   * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
   * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
   *
   * _Available since v4.3._
   */
  function tryRecover(bytes32 hash, bytes memory signature)
    internal
    pure
    returns (address, RecoverError)
  {
    // Check the signature length
    // - case 65: r,s,v signature (standard)
    // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
    if (signature.length == 65) {
      bytes32 r;
      bytes32 s;
      uint8 v;
      // ecrecover takes the signature parameters, and the only way to get them
      // currently is to use assembly.
      assembly {
        r := mload(add(signature, 0x20))
        s := mload(add(signature, 0x40))
        v := byte(0, mload(add(signature, 0x60)))
      }
      return tryRecover(hash, v, r, s);
    } else if (signature.length == 64) {
      bytes32 r;
      bytes32 vs;
      // ecrecover takes the signature parameters, and the only way to get them
      // currently is to use assembly.
      assembly {
        r := mload(add(signature, 0x20))
        vs := mload(add(signature, 0x40))
      }
      return tryRecover(hash, r, vs);
    } else {
      return (address(0), RecoverError.InvalidSignatureLength);
    }
  }

  /**
   * @dev Returns the address that signed a hashed message (`hash`) with
   * `signature`. This address can then be used for verification purposes.
   *
   * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
   * this function rejects them by requiring the `s` value to be in the lower
   * half order, and the `v` value to be either 27 or 28.
   *
   * IMPORTANT: `hash` _must_ be the result of a hash operation for the
   * verification to be secure: it is possible to craft signatures that
   * recover to arbitrary addresses for non-hashed data. A safe way to ensure
   * this is by receiving a hash of the original message (which may otherwise
   * be too long), and then calling {toEthSignedMessageHash} on it.
   */
  function recover(bytes32 hash, bytes memory signature)
    internal
    pure
    returns (address)
  {
    (address recovered, RecoverError error) = tryRecover(hash, signature);
    _throwError(error);
    return recovered;
  }

  /**
   * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
   *
   * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
   *
   * _Available since v4.3._
   */
  function tryRecover(
    bytes32 hash,
    bytes32 r,
    bytes32 vs
  ) internal pure returns (address, RecoverError) {
    bytes32 s;
    uint8 v;
    assembly {
      s := and(
        vs,
        0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
      )
      v := add(shr(255, vs), 27)
    }
    return tryRecover(hash, v, r, s);
  }

  /**
   * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
   *
   * _Available since v4.2._
   */
  function recover(
    bytes32 hash,
    bytes32 r,
    bytes32 vs
  ) internal pure returns (address) {
    (address recovered, RecoverError error) = tryRecover(hash, r, vs);
    _throwError(error);
    return recovered;
  }

  /**
   * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
   * `r` and `s` signature fields separately.
   *
   * _Available since v4.3._
   */
  function tryRecover(
    bytes32 hash,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) internal pure returns (address, RecoverError) {
    // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
    // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
    // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
    // signatures from current libraries generate a unique signature with an s-value in the lower half order.
    //
    // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
    // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
    // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
    // these malleable signatures as well.
    if (
      uint256(s) >
      0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
    ) {
      return (address(0), RecoverError.InvalidSignatureS);
    }
    if (v != 27 && v != 28) {
      return (address(0), RecoverError.InvalidSignatureV);
    }

    // If the signature is valid (and not malleable), return the signer address
    address signer = ecrecover(hash, v, r, s);
    if (signer == address(0)) {
      return (address(0), RecoverError.InvalidSignature);
    }

    return (signer, RecoverError.NoError);
  }

  /**
   * @dev Overload of {ECDSA-recover} that receives the `v`,
   * `r` and `s` signature fields separately.
   */
  function recover(
    bytes32 hash,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) internal pure returns (address) {
    (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
    _throwError(error);
    return recovered;
  }

  /**
   * @dev Returns an Ethereum Signed Message, created from a `hash`. This
   * produces hash corresponding to the one signed with the
   * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
   * JSON-RPC method as part of EIP-191.
   *
   * See {recover}.
   */
  function toEthSignedMessageHash(bytes32 hash)
    internal
    pure
    returns (bytes32)
  {
    // 32 is the length in bytes of hash,
    // enforced by the type signature above
    return
      keccak256(abi.encodePacked('\x19Ethereum Signed Message:\n32', hash));
  }

  /**
   * @dev Returns an Ethereum Signed Message, created from `s`. This
   * produces hash corresponding to the one signed with the
   * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
   * JSON-RPC method as part of EIP-191.
   *
   * See {recover}.
   */
  function toEthSignedMessageHash(bytes memory s)
    internal
    pure
    returns (bytes32)
  {
    return
      keccak256(
        abi.encodePacked(
          '\x19Ethereum Signed Message:\n',
          Strings.toString(s.length),
          s
        )
      );
  }

  /**
   * @dev Returns an Ethereum Signed Typed Data, created from a
   * `domainSeparator` and a `structHash`. This produces hash corresponding
   * to the one signed with the
   * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
   * JSON-RPC method as part of EIP-712.
   *
   * See {recover}.
   */
  function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash)
    internal
    pure
    returns (bytes32)
  {
    return keccak256(abi.encodePacked('\x19\x01', domainSeparator, structHash));
  }
}

// File @openzeppelin/contracts/utils/cryptography/draft-EIP712.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
  /* solhint-disable var-name-mixedcase */
  // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
  // invalidate the cached domain separator if the chain id changes.
  bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
  uint256 private immutable _CACHED_CHAIN_ID;
  address private immutable _CACHED_THIS;

  bytes32 private immutable _HASHED_NAME;
  bytes32 private immutable _HASHED_VERSION;
  bytes32 private immutable _TYPE_HASH;

  /* solhint-enable var-name-mixedcase */

  /**
   * @dev Initializes the domain separator and parameter caches.
   *
   * The meaning of `name` and `version` is specified in
   * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
   *
   * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
   * - `version`: the current major version of the signing domain.
   *
   * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
   * contract upgrade].
   */
  constructor(string memory name, string memory version) {
    bytes32 hashedName = keccak256(bytes(name));
    bytes32 hashedVersion = keccak256(bytes(version));
    bytes32 typeHash = keccak256(
      'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'
    );
    _HASHED_NAME = hashedName;
    _HASHED_VERSION = hashedVersion;
    _CACHED_CHAIN_ID = block.chainid;
    _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(
      typeHash,
      hashedName,
      hashedVersion
    );
    _CACHED_THIS = address(this);
    _TYPE_HASH = typeHash;
  }

  /**
   * @dev Returns the domain separator for the current chain.
   */
  function _domainSeparatorV4() internal view returns (bytes32) {
    if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
      return _CACHED_DOMAIN_SEPARATOR;
    } else {
      return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
    }
  }

  function _buildDomainSeparator(
    bytes32 typeHash,
    bytes32 nameHash,
    bytes32 versionHash
  ) private view returns (bytes32) {
    return
      keccak256(
        abi.encode(
          typeHash,
          nameHash,
          versionHash,
          block.chainid,
          address(this)
        )
      );
  }

  /**
   * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
   * function returns the hash of the fully encoded EIP712 message for this domain.
   *
   * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
   *
   * ```solidity
   * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
   *     keccak256("Mail(address to,string contents)"),
   *     mailTo,
   *     keccak256(bytes(mailContents))
   * )));
   * address signer = ECDSA.recover(digest, signature);
   * ```
   */
  function _hashTypedDataV4(bytes32 structHash)
    internal
    view
    virtual
    returns (bytes32)
  {
    return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
  }
}

// File contracts/ActualGenesis.sol

// ███████████████████████████████
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// ██████████▀`           ╓███████
// ███████▀^     ╓▓▄      ████████
// █████▌      ▄███▌      ║███████
// ████╨     ,▓████M       ▀██████
// ███       █████╛         ▀█████
// ██M       ╨▀▀'            ╚████
// ██              ╓█▓         ▀██
// ██           ,▄█████,        ██
// ██▓▄     ,▄▄█████████▓▄,   ▄▓██
// ███████████████████████████████
// ██▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀██
// ██ █▀▀▀▀▀█ █  ▄▄▄▀▀█ █▀▀▀▀▀█ ██
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// ██ ▀▀▀▀▀▀▀ ▀   ▀▀ ▀ ▀▀   ▀▀▀ ██
// ██ ------------------------- ██
// ██ ACTUAL            GENESIS ██
// ██ BY           NEU × REGIME ██
// ██                           ██
// ██    https://actual.gallery ██
// ██            @actualgallery ██
// ██                           ██
// ██        https://neuregi.me ██
// ██               @neuxregime ██
// ██ ------------------------- ██
// ██▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄██
// ███████████████████████████████
// ██ "NEVER BEFORE, HAS THERE  ██
// ██ BEEN SO MUCH LIGHT" ████████
// ██ -M. ████████████████████████
// ██████████ ENCODING REQUIRES ██
// ██ POWERLINE SUPPORTING FONT ██
// ███████████████████████████████
// ███████████████ JAN. 6, 2022 ██
// ███████████████████████████████

pragma solidity ^0.8.4;

error TokenURILocked();
error ArweaveIDLocked();
error SaleIsLocked();
error AllArtworksSold();
error ArtworkAlreadyMinted();
error ArtworkDoesNotExist();
error NewMaxNumberLowerThanCurrentNumberOfMintedArtworks();
error NewMaxNumberGreaterThanTotalSupply();
error AmountMoreThanSetPrice();
error AmountLessThanSetPrice();
error MoreThanOneArtworkExistsAlready();
error SenderIsDifferentFromOwner();
error ArtworkWithProvidedTokenIdDoesNotExist();
error DirectMintDisallowedSignatureMismatch();
error WithdrawalFailed();

contract ActualGenesis is ERC721, EIP712, Ownable {
  string public tokenBaseURI;
  bool public tokenURILocked;

  string public arweaveID;
  bool public arweaveIDLocked;

  string public tokenURISuffix = '';

  bool public saleLocked;
  uint256 public totalSupply;
  uint256 public maxNumberOfArtworks;
  uint256 public numberOfMintedArtworks;
  uint256 public pricePerArtwork;
  uint256 public artistProofs = 10;

  mapping(uint256 => bool) private tokenIdToIsArtworkPrivate;
  mapping(uint256 => address) private tokenIdToAddressArtworkIsLentTo;

  event Purchase(address indexed buyer, uint256 price, uint256 indexed tokenId);
  event Gift(address indexed receiver, uint256 indexed tokenId);
  event Lend(
    address indexed from,
    address indexed receiver,
    uint256 indexed tokenId
  );
  event ArweaveIdUpdated(string newArweaveId);

  constructor(
    string memory _tokenBaseURI,
    bool _saleLocked,
    uint256 _totalSupply,
    uint256 _maxNumberOfArtworks,
    uint256 _pricePerArtwork
  ) ERC721('Actual Genesis', 'ACTUAL') EIP712('Actual Genesis', '1.0.0') {
    tokenBaseURI = _tokenBaseURI;
    saleLocked = _saleLocked;
    totalSupply = _totalSupply;
    maxNumberOfArtworks = _maxNumberOfArtworks;
    pricePerArtwork = _pricePerArtwork;
  }

  /**
   * @dev Checks whether th eprovided `tokenId` exists.
   *
   * @param tokenId artwork token id
   *
   * @return true if artwork exists (has been minted
   * already), false otherwise
   */
  function exists(uint256 tokenId) public view returns (bool) {
    return _exists(tokenId);
  }

  /**
   * @dev Base URI for computing {tokenURI}. The resulting
   * tokenURI for each token will be the concatenation of
   * the `baseURI` and the `tokenId`.
   */
  function _baseURI() internal view override returns (string memory) {
    return tokenBaseURI;
  }

  /**
   * @dev Changes `baseURI`, useful when freezing the
   * contract.
   *
   * @notice that value cannot be changed if `tokenURILocked`
   * is locked.
   *
   * @param newBaseURI new URI replacing the old one
   */
  function setTokenBaseURI(string memory newBaseURI) public onlyOwner {
    if (tokenURILocked == true) revert TokenURILocked();
    tokenBaseURI = newBaseURI;
  }

  /**
   * @dev Overriden `tokenURI` with the ability to add a
   * suffix to URI. This is particularly helpful if
   * if metadata is "baked" as static .json files.
   *
   * @notice calls ERC721 `tokenURI` first and concatenates
   * the returned value with `tokenURISuffix`
   *
   * @param tokenId id of token to retrive URI for
   */
  function tokenURI(uint256 tokenId)
    public
    view
    override
    returns (string memory)
  {
    string memory tokenURIBasename = super.tokenURI(tokenId);

    return
      bytes(tokenURIBasename).length > 0
        ? string(abi.encodePacked(tokenURIBasename, tokenURISuffix))
        : '';
  }

  /**
   * @dev Lock the `baseURI` preventing any changes to
   * be committed to it. Useful when freezing the contract.
   */
  function lockTokenURI() public onlyOwner {
    tokenURILocked = true;
  }

  /**
   * @dev Changes `tokenURISuffix`, useful when freezing the
   * contract after all assets have been decentralized.
   *
   * @param newTokenURISuffix new suffix replacing the old one
   */
  function setTokenURISuffix(string memory newTokenURISuffix) public onlyOwner {
    tokenURISuffix = newTokenURISuffix;
  }

  /**
   * @dev Changes `arweaveID`, useful when freezing the
   * contract after all assets have been decentralized.
   *
   * @notice that value cannot be changed if `arweaveIDLocked`
   * is locked.
   *
   * @param newArweaveID new ID replacing the old one
   */
  function setArweaveID(string memory newArweaveID) public onlyOwner {
    if (arweaveIDLocked == true) revert ArweaveIDLocked();
    arweaveID = newArweaveID;
  }

  /**
   * @dev Lock the `arweaveID` preventing any changes to be
   * committed to it. Useful when freezing the contract.
   */
  function lockArweaveID() public onlyOwner {
    arweaveIDLocked = true;
  }

  /**
   * @dev Collects balance sum and transfers to sender.
   */
  function collectSum() public onlyOwner {
    (bool success, ) = payable(msg.sender).call{value: address(this).balance}(
      ''
    );
    if (success == false) revert WithdrawalFailed();
  }

  /**
   * @dev Permits lending of an artwork to an arbitrary
   * address 'addressToLendTo'. This functionality is to be
   * used in conjuction with setArtworkPublic/Private
   *
   * Requirements:
   * - `tokenID` must be owned by msg.sender
   * - `tokenID` must be already minted
   *
   * @param tokenID id of token that will be lent
   * @param addressToLendTo address of the borrower
   *
   * Emits a {Lend} event.
   */
  function lend(uint256 tokenID, address addressToLendTo) public {
    if (!_exists(tokenID)) revert ArtworkDoesNotExist();
    if (ownerOf(tokenID) != msg.sender) revert SenderIsDifferentFromOwner();

    emit Lend(ownerOf(tokenID), addressToLendTo, tokenID);
    tokenIdToAddressArtworkIsLentTo[tokenID] = addressToLendTo;
  }

  /**
   * @dev Checks the address to which `tokenID` is lent to.
   *
   * Requirements:
   * - `tokenID` must be already minted
   *
   * @param tokenID id of token that is lent
   * @return address of the borrower of `tokenID`
   */
  function getLentToAddress(uint256 tokenID) public view returns (address) {
    if (!_exists(tokenID)) revert ArtworkDoesNotExist();
    return tokenIdToAddressArtworkIsLentTo[tokenID];
  }

  /**
   * @dev Makes an artwork with `tokenID` public
   *
   * Requirements:
   * - `tokenID` must be owned by msg.sender
   * - `tokenID` must be already minted
   *
   * @param tokenID id of token that will be made public
   */
  function setArtworkPublic(uint256 tokenID) public {
    setArtworkPrivateState(tokenID, false);
  }

  /**
   * @dev Makes an artwork with `tokenID` private
   *
   * Requirements:
   * - `tokenID` must be owned by msg.sender
   * - `tokenID` must be already minted
   *
   * @param tokenID id of token that will be made private
   */
  function setArtworkPrivate(uint256 tokenID) public {
    setArtworkPrivateState(tokenID, true);
  }

  /**
   * @dev Checks if an artwork with `tokenID` is public or
   * private.
   *
   * Requirements:
   * - `tokenID` must be already minted
   *
   * @param tokenID id of artwork to check
   * @return true if private, false if public
   */
  function isArtworkPrivate(uint256 tokenID) public view returns (bool) {
    if (!_exists(tokenID)) revert ArtworkDoesNotExist();
    return tokenIdToIsArtworkPrivate[tokenID];
  }

  /**
   * @dev Helper function to modify the private/public state
   * of `tokenID`.
   *
   * Requirements:
   * - `tokenID` must be owned by msg.sender
   * - `tokenID` must be already minted
   *
   * @param tokenID id of token to be made private/public
   * @param flag true to make private, false to make public
   */
  function setArtworkPrivateState(uint256 tokenID, bool flag) private {
    if (!_exists(tokenID)) revert ArtworkDoesNotExist();
    if (ownerOf(tokenID) != msg.sender) revert SenderIsDifferentFromOwner();

    tokenIdToIsArtworkPrivate[tokenID] = flag;
  }

  /**
   * @dev Checks the number of artworks available for minting.
   *
   * @return the number of artworks available for minting
   */
  function artworksLeft() public view returns (uint256) {
    return maxNumberOfArtworks - numberOfMintedArtworks;
  }

  /**
   * @dev Changes the maximum number of artworks available for
   * minting.
   *
   * Requirements:
   * - new maximum must be < than total number of artworks
   * - new maximum must be > than  artworks minted so far
   *
   * @param newMaxNumberOfArtworks new maximum
   */
  function setMaxNumberOfArtworks(uint256 newMaxNumberOfArtworks)
    public
    onlyOwner
  {
    if (newMaxNumberOfArtworks < numberOfMintedArtworks)
      revert NewMaxNumberLowerThanCurrentNumberOfMintedArtworks();
    if (newMaxNumberOfArtworks >= totalSupply)
      revert NewMaxNumberGreaterThanTotalSupply();

    maxNumberOfArtworks = newMaxNumberOfArtworks;
  }

  /**
   * @dev Modifier ensuring that the minting tx is valid.
   *
   * Requirements:
   * - sale is not locked
   * - there are artworks left to be minted
   * - artwork is not already minted
   * - artwork `tokenId` is valid and <= total supply
   * - transaction value is exactly same as the base price
   *
   * @param newTokenId new token ID that will be minted
   */
  modifier isSaleValid(uint256 newTokenId) {
    if (msg.sender != owner() && saleLocked == true) revert SaleIsLocked();

    if (artworksLeft() == 0) revert AllArtworksSold();

    if (_exists(newTokenId)) revert ArtworkAlreadyMinted();

    if (newTokenId > totalSupply)
      revert ArtworkWithProvidedTokenIdDoesNotExist();

    if (msg.value < pricePerArtwork && msg.sender != owner())
      revert AmountLessThanSetPrice();

    if (msg.value > pricePerArtwork && msg.sender != owner())
      revert AmountMoreThanSetPrice();

    _;
  }

  /**
   * @dev Mints `artistProofs` number of artworks with
   * `tokenID` starting at 1 (inclusive) and increasing
   * to `artistProofs` (inclusive).
   *
   * Requirements:
   * - No artworks have been sold/minted already
   */
  function mintArtistProofs() public onlyOwner {
    if (numberOfMintedArtworks > 0) revert MoreThanOneArtworkExistsAlready();
    for (uint256 i = 1; i <= artistProofs; i++) {
      mintArtistProof(i);
    }
  }

  /**
   * @dev Helper function to mint artist proofs
   */
  function mintArtistProof(uint256 newTokenId) private isSaleValid(newTokenId) {
    emit Purchase(msg.sender, msg.value, newTokenId);
    _mintPiece(newTokenId, msg.sender);
  }

  /**
   * @dev Computes EIP 712 hash of typed structure of
   * `account` and `tokenID`
   *
   * @param account msg.sender of minting transaction
   * @param newTokenId artwork to be minted
   *
   * @return the hash of the fully encoded EIP712 message
   * for this domain.
   */
  function _hash(address account, uint256 newTokenId)
    internal
    view
    returns (bytes32)
  {
    return
      _hashTypedDataV4(
        keccak256(
          abi.encode(
            keccak256('NFT(uint256 Artwork,address Buyer)'),
            newTokenId,
            account
          )
        )
      );
  }

  /**
   * @dev Compares an EIP 712 signed message of
   * `account`and `newTokenId` with one provided by the `buy`
   * function (incoming from client/wallet app).
   *
   * @param account msg.sender of minting transaction
   * @param newTokenId artwork to be minted
   * @param signature provided by the client/wallet
   *
   * @return true if contract-computed signature matches the
   * client/wallet signature, otherwise false, meaning that
   * the msg.sender is different from the wallet account that
   * signed the message.
   */
  function matchAddressSigner(
    address account,
    uint256 newTokenId,
    bytes memory signature
  ) private view returns (bool) {
    return account == ECDSA.recover(_hash(account, newTokenId), signature);
    // return _hash(account, newTokenId) == signature;
  }

  /**
   * @dev Mints an artwork with `newTokenId`
   *
   * Requirements:
   * - see isSaleValid(uint256 newTokenId)
   * - see matchAddressSigner(...)
   *
   * @param signature client-provided wallet-signed keccak256
   * hash of msg.sender and `newTokenId`
   * @param newTokenId artwork to be minted
   *
   * Emits a {Transfer} and {Purchase} event.
   */
  function buy(bytes memory signature, uint256 newTokenId)
    public
    payable
    isSaleValid(newTokenId)
  {
    if (matchAddressSigner(msg.sender, newTokenId, signature) == false)
      revert DirectMintDisallowedSignatureMismatch();

    emit Purchase(msg.sender, msg.value, newTokenId);
    _mintPiece(newTokenId, msg.sender);
  }

  /**
   * @dev Gifting/airdrop functionality for owner
   *
   * Requirements:
   * - see isSaleValid(uint256 newTokenId)
   * - see onlyOwner(...)
   *
   * @param receiver address that will receive the artwork
   * @param newTokenId artwork to be minted
   *
   * Emits a {Transfer} and {Gift} event.
   */
  function gift(uint256 newTokenId, address receiver)
    public
    payable
    onlyOwner
    isSaleValid(newTokenId)
  {
    emit Gift(receiver, newTokenId);
    _mintPiece(newTokenId, receiver);
  }

  /**
   * @dev Helper function to mint artworks. Used in gift, buy,
   *and mintArtistProof.
   *
   * By defaults sets:
   * - the artwork to be public
   * - lent to the address of the owner (msg.sender)
   * - increments `numberOfMintedArtworks`, the number of
   *   artworks minted so far
   *
   * @param toAddress address that will own the artwork
   * @param newTokenId artwork to be minted
   *
   * Emits a {Transfer} event.
   */
  function _mintPiece(uint256 newTokenId, address toAddress) private {
    tokenIdToIsArtworkPrivate[newTokenId] = false;
    tokenIdToAddressArtworkIsLentTo[newTokenId] = msg.sender;
    numberOfMintedArtworks += 1;

    _safeMint(toAddress, newTokenId);
  }

  /**
   * @dev Locks public sale
   *
   * Requirements:
   * - see onlyOwner(...)
   */
  function lockSale() public onlyOwner {
    saleLocked = true;
  }

  /**
   * @dev Unlocks public sale
   *
   * Requirements:
   * - see onlyOwner(...)
   */
  function unlockSale() public onlyOwner {
    saleLocked = false;
  }

  /**
   * @dev Getter function to determine if public sale is
   * locked or not.
   *
   * @return true if sale is locked, false otherwise
   */
  function getSaleLocked() public view returns (bool) {
    return saleLocked;
  }
}