Theta Smart Contracts | ThetaScan.io

Node:

Token Contract Details

Contract:

0x053cd0e05e6df3990ee35bd7a640b5aa92e77176

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Published Contract:

// SPDX-License-Identifier: MIT

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);
 }
}




/*
 * @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;
 }
}




/**
 * @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);
}














/**
 * @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;
}





/**
 * @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);
}







/**
 * @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);
}





/**
 * @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);
 }

 function _verifyCallResult(
 bool success,
 bytes memory returndata,
 string memory errorMessage
 ) private 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);
 }
 }
 }
}









/**
 * @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;
 }
}


/**
 * @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 {
 require(operator != _msgSender(), "ERC721: approve to caller");

 _operatorApprovals[_msgSender()][operator] = approved;
 emit ApprovalForAll(_msgSender(), operator, approved);
 }

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

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

 _transfer(from, to, tokenId);
 }

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

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

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

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

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

 /**
 * @dev 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 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(to).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 {}
}












/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
 /**
 * @dev Returns the total amount of tokens stored by the contract.
 */
 function totalSupply() external view returns (uint256);

 /**
 * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
 * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
 */
 function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

 /**
 * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
 * Use along with {totalSupply} to enumerate all tokens.
 */
 function tokenByIndex(uint256 index) external view returns (uint256);
}


/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
 // Mapping from owner to list of owned token IDs
 mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

 // Mapping from token ID to index of the owner tokens list
 mapping(uint256 => uint256) private _ownedTokensIndex;

 // Array with all token ids, used for enumeration
 uint256[] private _allTokens;

 // Mapping from token id to position in the allTokens array
 mapping(uint256 => uint256) private _allTokensIndex;

 /**
 * @dev See {IERC165-supportsInterface}.
 */
 function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
 return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
 }

 /**
 * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
 */
 function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
 require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
 return _ownedTokens[owner][index];
 }

 /**
 * @dev See {IERC721Enumerable-totalSupply}.
 */
 function totalSupply() public view virtual override returns (uint256) {
 return _allTokens.length;
 }

 /**
 * @dev See {IERC721Enumerable-tokenByIndex}.
 */
 function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
 require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
 return _allTokens[index];
 }

 /**
 * @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` cannot be the zero address.
 * - `to` cannot be the zero address.
 *
 * 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 override {
 super._beforeTokenTransfer(from, to, tokenId);

 if (from == address(0)) {
 _addTokenToAllTokensEnumeration(tokenId);
 } else if (from != to) {
 _removeTokenFromOwnerEnumeration(from, tokenId);
 }
 if (to == address(0)) {
 _removeTokenFromAllTokensEnumeration(tokenId);
 } else if (to != from) {
 _addTokenToOwnerEnumeration(to, tokenId);
 }
 }

 /**
 * @dev Private function to add a token to this extension's ownership-tracking data structures.
 * @param to address representing the new owner of the given token ID
 * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
 */
 function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
 uint256 length = ERC721.balanceOf(to);
 _ownedTokens[to][length] = tokenId;
 _ownedTokensIndex[tokenId] = length;
 }

 /**
 * @dev Private function to add a token to this extension's token tracking data structures.
 * @param tokenId uint256 ID of the token to be added to the tokens list
 */
 function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
 _allTokensIndex[tokenId] = _allTokens.length;
 _allTokens.push(tokenId);
 }

 /**
 * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
 * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
 * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
 * This has O(1) time complexity, but alters the order of the _ownedTokens array.
 * @param from address representing the previous owner of the given token ID
 * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
 */
 function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
 // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
 // then delete the last slot (swap and pop).

 uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
 uint256 tokenIndex = _ownedTokensIndex[tokenId];

 // When the token to delete is the last token, the swap operation is unnecessary
 if (tokenIndex != lastTokenIndex) {
 uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

 _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
 _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
 }

 // This also deletes the contents at the last position of the array
 delete _ownedTokensIndex[tokenId];
 delete _ownedTokens[from][lastTokenIndex];
 }

 /**
 * @dev Private function to remove a token from this extension's token tracking data structures.
 * This has O(1) time complexity, but alters the order of the _allTokens array.
 * @param tokenId uint256 ID of the token to be removed from the tokens list
 */
 function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
 // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
 // then delete the last slot (swap and pop).

 uint256 lastTokenIndex = _allTokens.length - 1;
 uint256 tokenIndex = _allTokensIndex[tokenId];

 // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
 // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
 // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
 uint256 lastTokenId = _allTokens[lastTokenIndex];

 _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
 _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

 // This also deletes the contents at the last position of the array
 delete _allTokensIndex[tokenId];
 _allTokens.pop();
 }
}








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












/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
 /**
 * @dev Emitted when the pause is triggered by `account`.
 */
 event Paused(address account);

 /**
 * @dev Emitted when the pause is lifted by `account`.
 */
 event Unpaused(address account);

 bool private _paused;

 /**
 * @dev Initializes the contract in unpaused state.
 */
 constructor() {
 _paused = false;
 }

 /**
 * @dev Returns true if the contract is paused, and false otherwise.
 */
 function paused() public view virtual returns (bool) {
 return _paused;
 }

 /**
 * @dev Modifier to make a function callable only when the contract is not paused.
 *
 * Requirements:
 *
 * - The contract must not be paused.
 */
 modifier whenNotPaused() {
 require(!paused(), "Pausable: paused");
 _;
 }

 /**
 * @dev Modifier to make a function callable only when the contract is paused.
 *
 * Requirements:
 *
 * - The contract must be paused.
 */
 modifier whenPaused() {
 require(paused(), "Pausable: not paused");
 _;
 }

 /**
 * @dev Triggers stopped state.
 *
 * Requirements:
 *
 * - The contract must not be paused.
 */
 function _pause() internal virtual whenNotPaused {
 _paused = true;
 emit Paused(_msgSender());
 }

 /**
 * @dev Returns to normal state.
 *
 * Requirements:
 *
 * - The contract must be paused.
 */
 function _unpause() internal virtual whenPaused {
 _paused = false;
 emit Unpaused(_msgSender());
 }
}


/**
 * @dev ERC721 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
abstract contract ERC721Pausable is ERC721, Pausable {
 /**
 * @dev See {ERC721-_beforeTokenTransfer}.
 *
 * Requirements:
 *
 * - the contract must not be paused.
 */
 function _beforeTokenTransfer(
 address from,
 address to,
 uint256 tokenId
 ) internal virtual override {
 super._beforeTokenTransfer(from, to, tokenId);

 require(!paused(), "ERC721Pausable: token transfer while paused");
 }
}













/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
 function hasRole(bytes32 role, address account) external view returns (bool);

 function getRoleAdmin(bytes32 role) external view returns (bytes32);

 function grantRole(bytes32 role, address account) external;

 function revokeRole(bytes32 role, address account) external;

 function renounceRole(bytes32 role, address account) external;
}

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 * require(hasRole(MY_ROLE, msg.sender));
 * ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
 struct RoleData {
 mapping(address => bool) members;
 bytes32 adminRole;
 }

 mapping(bytes32 => RoleData) private _roles;

 bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

 /**
 * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
 *
 * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
 * {RoleAdminChanged} not being emitted signaling this.
 *
 * _Available since v3.1._
 */
 event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

 /**
 * @dev Emitted when `account` is granted `role`.
 *
 * `sender` is the account that originated the contract call, an admin role
 * bearer except when using {_setupRole}.
 */
 event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

 /**
 * @dev Emitted when `account` is revoked `role`.
 *
 * `sender` is the account that originated the contract call:
 * - if using `revokeRole`, it is the admin role bearer
 * - if using `renounceRole`, it is the role bearer (i.e. `account`)
 */
 event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

 /**
 * @dev Modifier that checks that an account has a specific role. Reverts
 * with a standardized message including the required role.
 *
 * The format of the revert reason is given by the following regular expression:
 *
 * /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
 *
 * _Available since v4.1._
 */
 modifier onlyRole(bytes32 role) {
 _checkRole(role, _msgSender());
 _;
 }

 /**
 * @dev See {IERC165-supportsInterface}.
 */
 function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
 }

 /**
 * @dev Returns `true` if `account` has been granted `role`.
 */
 function hasRole(bytes32 role, address account) public view override returns (bool) {
 return _roles[role].members[account];
 }

 /**
 * @dev Revert with a standard message if `account` is missing `role`.
 *
 * The format of the revert reason is given by the following regular expression:
 *
 * /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
 */
 function _checkRole(bytes32 role, address account) internal view {
 if (!hasRole(role, account)) {
 revert(
 string(
 abi.encodePacked(
 "AccessControl: account ",
 Strings.toHexString(uint160(account), 20),
 " is missing role ",
 Strings.toHexString(uint256(role), 32)
 )
 )
 );
 }
 }

 /**
 * @dev Returns the admin role that controls `role`. See {grantRole} and
 * {revokeRole}.
 *
 * To change a role's admin, use {_setRoleAdmin}.
 */
 function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
 return _roles[role].adminRole;
 }

 /**
 * @dev Grants `role` to `account`.
 *
 * If `account` had not been already granted `role`, emits a {RoleGranted}
 * event.
 *
 * Requirements:
 *
 * - the caller must have ``role``'s admin role.
 */
 function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
 _grantRole(role, account);
 }

 /**
 * @dev Revokes `role` from `account`.
 *
 * If `account` had been granted `role`, emits a {RoleRevoked} event.
 *
 * Requirements:
 *
 * - the caller must have ``role``'s admin role.
 */
 function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
 _revokeRole(role, account);
 }

 /**
 * @dev Revokes `role` from the calling account.
 *
 * Roles are often managed via {grantRole} and {revokeRole}: this function's
 * purpose is to provide a mechanism for accounts to lose their privileges
 * if they are compromised (such as when a trusted device is misplaced).
 *
 * If the calling account had been granted `role`, emits a {RoleRevoked}
 * event.
 *
 * Requirements:
 *
 * - the caller must be `account`.
 */
 function renounceRole(bytes32 role, address account) public virtual override {
 require(account == _msgSender(), "AccessControl: can only renounce roles for self");

 _revokeRole(role, account);
 }

 /**
 * @dev Grants `role` to `account`.
 *
 * If `account` had not been already granted `role`, emits a {RoleGranted}
 * event. Note that unlike {grantRole}, this function doesn't perform any
 * checks on the calling account.
 *
 * [WARNING]
 * ====
 * This function should only be called from the constructor when setting
 * up the initial roles for the system.
 *
 * Using this function in any other way is effectively circumventing the admin
 * system imposed by {AccessControl}.
 * ====
 */
 function _setupRole(bytes32 role, address account) internal virtual {
 _grantRole(role, account);
 }

 /**
 * @dev Sets `adminRole` as ``role``'s admin role.
 *
 * Emits a {RoleAdminChanged} event.
 */
 function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
 emit RoleAdminChanged(role, getRoleAdmin(role), adminRole);
 _roles[role].adminRole = adminRole;
 }

 function _grantRole(bytes32 role, address account) private {
 if (!hasRole(role, account)) {
 _roles[role].members[account] = true;
 emit RoleGranted(role, account, _msgSender());
 }
 }

 function _revokeRole(bytes32 role, address account) private {
 if (hasRole(role, account)) {
 _roles[role].members[account] = false;
 emit RoleRevoked(role, account, _msgSender());
 }
 }
}





/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 * // Add the library methods
 * using EnumerableSet for EnumerableSet.AddressSet;
 *
 * // Declare a set state variable
 * EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
 // To implement this library for multiple types with as little code
 // repetition as possible, we write it in terms of a generic Set type with
 // bytes32 values.
 // The Set implementation uses private functions, and user-facing
 // implementations (such as AddressSet) are just wrappers around the
 // underlying Set.
 // This means that we can only create new EnumerableSets for types that fit
 // in bytes32.

 struct Set {
 // Storage of set values
 bytes32[] _values;
 // Position of the value in the `values` array, plus 1 because index 0
 // means a value is not in the set.
 mapping(bytes32 => uint256) _indexes;
 }

 /**
 * @dev Add a value to a set. O(1).
 *
 * Returns true if the value was added to the set, that is if it was not
 * already present.
 */
 function _add(Set storage set, bytes32 value) private returns (bool) {
 if (!_contains(set, value)) {
 set._values.push(value);
 // The value is stored at length-1, but we add 1 to all indexes
 // and use 0 as a sentinel value
 set._indexes[value] = set._values.length;
 return true;
 } else {
 return false;
 }
 }

 /**
 * @dev Removes a value from a set. O(1).
 *
 * Returns true if the value was removed from the set, that is if it was
 * present.
 */
 function _remove(Set storage set, bytes32 value) private returns (bool) {
 // We read and store the value's index to prevent multiple reads from the same storage slot
 uint256 valueIndex = set._indexes[value];

 if (valueIndex != 0) {
 // Equivalent to contains(set, value)
 // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
 // the array, and then remove the last element (sometimes called as 'swap and pop').
 // This modifies the order of the array, as noted in {at}.

 uint256 toDeleteIndex = valueIndex - 1;
 uint256 lastIndex = set._values.length - 1;

 if (lastIndex != toDeleteIndex) {
 bytes32 lastvalue = set._values[lastIndex];

 // Move the last value to the index where the value to delete is
 set._values[toDeleteIndex] = lastvalue;
 // Update the index for the moved value
 set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
 }

 // Delete the slot where the moved value was stored
 set._values.pop();

 // Delete the index for the deleted slot
 delete set._indexes[value];

 return true;
 } else {
 return false;
 }
 }

 /**
 * @dev Returns true if the value is in the set. O(1).
 */
 function _contains(Set storage set, bytes32 value) private view returns (bool) {
 return set._indexes[value] != 0;
 }

 /**
 * @dev Returns the number of values on the set. O(1).
 */
 function _length(Set storage set) private view returns (uint256) {
 return set._values.length;
 }

 /**
 * @dev Returns the value stored at position `index` in the set. O(1).
 *
 * Note that there are no guarantees on the ordering of values inside the
 * array, and it may change when more values are added or removed.
 *
 * Requirements:
 *
 * - `index` must be strictly less than {length}.
 */
 function _at(Set storage set, uint256 index) private view returns (bytes32) {
 return set._values[index];
 }

 // Bytes32Set

 struct Bytes32Set {
 Set _inner;
 }

 /**
 * @dev Add a value to a set. O(1).
 *
 * Returns true if the value was added to the set, that is if it was not
 * already present.
 */
 function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
 return _add(set._inner, value);
 }

 /**
 * @dev Removes a value from a set. O(1).
 *
 * Returns true if the value was removed from the set, that is if it was
 * present.
 */
 function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
 return _remove(set._inner, value);
 }

 /**
 * @dev Returns true if the value is in the set. O(1).
 */
 function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
 return _contains(set._inner, value);
 }

 /**
 * @dev Returns the number of values in the set. O(1).
 */
 function length(Bytes32Set storage set) internal view returns (uint256) {
 return _length(set._inner);
 }

 /**
 * @dev Returns the value stored at position `index` in the set. O(1).
 *
 * Note that there are no guarantees on the ordering of values inside the
 * array, and it may change when more values are added or removed.
 *
 * Requirements:
 *
 * - `index` must be strictly less than {length}.
 */
 function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
 return _at(set._inner, index);
 }

 // AddressSet

 struct AddressSet {
 Set _inner;
 }

 /**
 * @dev Add a value to a set. O(1).
 *
 * Returns true if the value was added to the set, that is if it was not
 * already present.
 */
 function add(AddressSet storage set, address value) internal returns (bool) {
 return _add(set._inner, bytes32(uint256(uint160(value))));
 }

 /**
 * @dev Removes a value from a set. O(1).
 *
 * Returns true if the value was removed from the set, that is if it was
 * present.
 */
 function remove(AddressSet storage set, address value) internal returns (bool) {
 return _remove(set._inner, bytes32(uint256(uint160(value))));
 }

 /**
 * @dev Returns true if the value is in the set. O(1).
 */
 function contains(AddressSet storage set, address value) internal view returns (bool) {
 return _contains(set._inner, bytes32(uint256(uint160(value))));
 }

 /**
 * @dev Returns the number of values in the set. O(1).
 */
 function length(AddressSet storage set) internal view returns (uint256) {
 return _length(set._inner);
 }

 /**
 * @dev Returns the value stored at position `index` in the set. O(1).
 *
 * Note that there are no guarantees on the ordering of values inside the
 * array, and it may change when more values are added or removed.
 *
 * Requirements:
 *
 * - `index` must be strictly less than {length}.
 */
 function at(AddressSet storage set, uint256 index) internal view returns (address) {
 return address(uint160(uint256(_at(set._inner, index))));
 }

 // UintSet

 struct UintSet {
 Set _inner;
 }

 /**
 * @dev Add a value to a set. O(1).
 *
 * Returns true if the value was added to the set, that is if it was not
 * already present.
 */
 function add(UintSet storage set, uint256 value) internal returns (bool) {
 return _add(set._inner, bytes32(value));
 }

 /**
 * @dev Removes a value from a set. O(1).
 *
 * Returns true if the value was removed from the set, that is if it was
 * present.
 */
 function remove(UintSet storage set, uint256 value) internal returns (bool) {
 return _remove(set._inner, bytes32(value));
 }

 /**
 * @dev Returns true if the value is in the set. O(1).
 */
 function contains(UintSet storage set, uint256 value) internal view returns (bool) {
 return _contains(set._inner, bytes32(value));
 }

 /**
 * @dev Returns the number of values on the set. O(1).
 */
 function length(UintSet storage set) internal view returns (uint256) {
 return _length(set._inner);
 }

 /**
 * @dev Returns the value stored at position `index` in the set. O(1).
 *
 * Note that there are no guarantees on the ordering of values inside the
 * array, and it may change when more values are added or removed.
 *
 * Requirements:
 *
 * - `index` must be strictly less than {length}.
 */
 function at(UintSet storage set, uint256 index) internal view returns (uint256) {
 return uint256(_at(set._inner, index));
 }
}


/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerable {
 function getRoleMember(bytes32 role, uint256 index) external view returns (address);

 function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl {
 using EnumerableSet for EnumerableSet.AddressSet;

 mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

 /**
 * @dev See {IERC165-supportsInterface}.
 */
 function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 return interfaceId == type(IAccessControlEnumerable).interfaceId || super.supportsInterface(interfaceId);
 }

 /**
 * @dev Returns one of the accounts that have `role`. `index` must be a
 * value between 0 and {getRoleMemberCount}, non-inclusive.
 *
 * Role bearers are not sorted in any particular way, and their ordering may
 * change at any point.
 *
 * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
 * you perform all queries on the same block. See the following
 * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
 * for more information.
 */
 function getRoleMember(bytes32 role, uint256 index) public view override returns (address) {
 return _roleMembers[role].at(index);
 }

 /**
 * @dev Returns the number of accounts that have `role`. Can be used
 * together with {getRoleMember} to enumerate all bearers of a role.
 */
 function getRoleMemberCount(bytes32 role) public view override returns (uint256) {
 return _roleMembers[role].length();
 }

 /**
 * @dev Overload {grantRole} to track enumerable memberships
 */
 function grantRole(bytes32 role, address account) public virtual override {
 super.grantRole(role, account);
 _roleMembers[role].add(account);
 }

 /**
 * @dev Overload {revokeRole} to track enumerable memberships
 */
 function revokeRole(bytes32 role, address account) public virtual override {
 super.revokeRole(role, account);
 _roleMembers[role].remove(account);
 }

 /**
 * @dev Overload {renounceRole} to track enumerable memberships
 */
 function renounceRole(bytes32 role, address account) public virtual override {
 super.renounceRole(role, account);
 _roleMembers[role].remove(account);
 }

 /**
 * @dev Overload {_setupRole} to track enumerable memberships
 */
 function _setupRole(bytes32 role, address account) internal virtual override {
 super._setupRole(role, account);
 _roleMembers[role].add(account);
 }
}






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

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

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

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

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


/**
 * @dev {ERC721} token, including:
 *
 * - ability for holders to burn (destroy) their tokens
 * - a minter role that allows for token minting (creation)
 * - a pauser role that allows to stop all token transfers
 * - token ID and URI autogeneration
 *
 * This contract uses {AccessControl} to lock permissioned functions using the
 * different roles - head to its documentation for details.
 *
 * The account that deploys the contract will be granted the minter and pauser
 * roles, as well as the default admin role, which will let it grant both minter
 * and pauser roles to other accounts.
 */
contract ThetaboardNFT is
Context,
AccessControlEnumerable,
ERC721Enumerable,
ERC721Burnable,
ERC721Pausable
{
 using Counters for Counters.Counter;

 bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
 bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

 Counters.Counter private _tokenIdTracker;

 string private _baseTokenURI;

 /**
 * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
 * account that deploys the contract.
 *
 * Token URIs will be autogenerated based on `baseURI` and their token IDs.
 * See {ERC721-tokenURI}.
 */
 constructor(
 string memory name,
 string memory symbol,
 string memory baseTokenURI
 ) ERC721(name, symbol) {
 _baseTokenURI = baseTokenURI;

 _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());

 _setupRole(MINTER_ROLE, _msgSender());
 _setupRole(PAUSER_ROLE, _msgSender());
 }

 function _baseURI() internal view virtual override returns (string memory) {
 return _baseTokenURI;
 }

 /**
 * @dev Creates a new token for `to`. Its token ID will be automatically
 * assigned (and available on the emitted {IERC721-Transfer} event), and the token
 * URI autogenerated based on the base URI passed at construction.
 *
 * See {ERC721-_mint}.
 *
 * Requirements:
 *
 * - the caller must have the `MINTER_ROLE`.
 */
 function mint(address to) public virtual {
 require(hasRole(MINTER_ROLE, _msgSender()), "ERC721PresetMinterPauserAutoId: must have minter role to mint");

 // We cannot just use balanceOf to create the new tokenId because tokens
 // can be burned (destroyed), so we need a separate counter.
 _mint(to, _tokenIdTracker.current());
 _tokenIdTracker.increment();
 }

 /**
 * @dev Pauses all token transfers.
 *
 * See {ERC721Pausable} and {Pausable-_pause}.
 *
 * Requirements:
 *
 * - the caller must have the `PAUSER_ROLE`.
 */
 function pause() public virtual {
 require(hasRole(PAUSER_ROLE, _msgSender()), "ERC721PresetMinterPauserAutoId: must have pauser role to pause");
 _pause();
 }

 /**
 * @dev Unpauses all token transfers.
 *
 * See {ERC721Pausable} and {Pausable-_unpause}.
 *
 * Requirements:
 *
 * - the caller must have the `PAUSER_ROLE`.
 */
 function unpause() public virtual {
 require(hasRole(PAUSER_ROLE, _msgSender()), "ERC721PresetMinterPauserAutoId: must have pauser role to unpause");
 _unpause();
 }

 function _beforeTokenTransfer(
 address from,
 address to,
 uint256 tokenId
 ) internal virtual override(ERC721, ERC721Enumerable, ERC721Pausable) {
 super._beforeTokenTransfer(from, to, tokenId);
 }

 /**
 * @dev See {IERC165-supportsInterface}.
 */
 function supportsInterface(bytes4 interfaceId)
 public
 view
 virtual
 override(AccessControlEnumerable, ERC721, ERC721Enumerable)
 returns (bool)
 {
 return super.supportsInterface(interfaceId);
 }
}

Contract ABI:

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