Theta Smart Contracts | ThetaScan.io

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Published Contract:

// File: @openzeppelin/contracts/access/IAccessControl.sol


// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
 /**
 * @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 {AccessControl-_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 Returns `true` if `account` has been granted `role`.
 */
 function hasRole(bytes32 role, address account) external view returns (bool);

 /**
 * @dev Returns the admin role that controls `role`. See {grantRole} and
 * {revokeRole}.
 *
 * To change a role's admin, use {AccessControl-_setRoleAdmin}.
 */
 function getRoleAdmin(bytes32 role) external view returns (bytes32);

 /**
 * @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) external;

 /**
 * @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) external;

 /**
 * @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) external;
}

// File: @openzeppelin/contracts/utils/math/Math.sol


// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/Strings.sol


// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;


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

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

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

 /**
 * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
 */
 function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
 bytes memory buffer = new bytes(2 * length + 2);
 buffer[0] = "0";
 buffer[1] = "x";
 for (uint256 i = 2 * length + 1; i > 1; --i) {
 buffer[i] = _SYMBOLS[value & 0xf];
 value >>= 4;
 }
 require(value == 0, "Strings: hex length insufficient");
 return string(buffer);
 }

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

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol


// OpenZeppelin Contracts (last updated v4.8.0) (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 // Deprecated in v4.8
 }

 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");
 }
 }

 /**
 * @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) {
 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.
 /// @solidity memory-safe-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 {
 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 = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
 uint8 v = uint8((uint256(vs) >> 255) + 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 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:
32", 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:
", 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/EIP712.sol


// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/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: @openzeppelin/contracts/utils/Context.sol


// 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/security/Pausable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;


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

 /**
 * @dev Modifier to make a function callable only when the contract is paused.
 *
 * Requirements:
 *
 * - The contract must be paused.
 */
 modifier whenPaused() {
 _requirePaused();
 _;
 }

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

 /**
 * @dev Throws if the contract is paused.
 */
 function _requireNotPaused() internal view virtual {
 require(!paused(), "Pausable: paused");
 }

 /**
 * @dev Throws if the contract is not paused.
 */
 function _requirePaused() internal view virtual {
 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());
 }
}

// File: @openzeppelin/contracts/utils/Address.sol


// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
 /**
 * @dev Returns true if `account` is a contract.
 *
 * [IMPORTANT]
 * ====
 * It is unsafe to assume that an address for which this function returns
 * false is an externally-owned account (EOA) and not a contract.
 *
 * Among others, `isContract` will return false for the following
 * types of addresses:
 *
 * - an externally-owned account
 * - a contract in construction
 * - an address where a contract will be created
 * - an address where a contract lived, but was destroyed
 * ====
 *
 * [IMPORTANT]
 * ====
 * You shouldn't rely on `isContract` to protect against flash loan attacks!
 *
 * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
 * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
 * constructor.
 * ====
 */
 function isContract(address account) internal view returns (bool) {
 // This method relies on extcodesize/address.code.length, which returns 0
 // for contracts in construction, since the code is only stored at the end
 // of the constructor execution.

 return account.code.length > 0;
 }

 /**
 * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
 * `recipient`, forwarding all available gas and reverting on errors.
 *
 * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
 * of certain opcodes, possibly making contracts go over the 2300 gas limit
 * imposed by `transfer`, making them unable to receive funds via
 * `transfer`. {sendValue} removes this limitation.
 *
 * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
 *
 * IMPORTANT: because control is transferred to `recipient`, care must be
 * taken to not create reentrancy vulnerabilities. Consider using
 * {ReentrancyGuard} or the
 * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
 */
 function sendValue(address payable recipient, uint256 amount) internal {
 require(address(this).balance >= amount, "Address: insufficient balance");

 (bool success, ) = recipient.call{value: amount}("");
 require(success, "Address: unable to send value, recipient may have reverted");
 }

 /**
 * @dev Performs a Solidity function call using a low level `call`. A
 * plain `call` is an unsafe replacement for a function call: use this
 * function instead.
 *
 * If `target` reverts with a revert reason, it is bubbled up by this
 * function (like regular Solidity function calls).
 *
 * Returns the raw returned data. To convert to the expected return value,
 * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
 *
 * Requirements:
 *
 * - `target` must be a contract.
 * - calling `target` with `data` must not revert.
 *
 * _Available since v3.1._
 */
 function functionCall(address target, bytes memory data) internal returns (bytes memory) {
 return functionCallWithValue(target, data, 0, "Address: low-level call failed");
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
 * `errorMessage` as a fallback revert reason when `target` reverts.
 *
 * _Available since v3.1._
 */
 function functionCall(
 address target,
 bytes memory data,
 string memory errorMessage
 ) internal returns (bytes memory) {
 return functionCallWithValue(target, data, 0, errorMessage);
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
 * but also transferring `value` wei to `target`.
 *
 * Requirements:
 *
 * - the calling contract must have an ETH balance of at least `value`.
 * - the called Solidity function must be `payable`.
 *
 * _Available since v3.1._
 */
 function functionCallWithValue(
 address target,
 bytes memory data,
 uint256 value
 ) internal returns (bytes memory) {
 return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
 }

 /**
 * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
 * with `errorMessage` as a fallback revert reason when `target` reverts.
 *
 * _Available since v3.1._
 */
 function functionCallWithValue(
 address target,
 bytes memory data,
 uint256 value,
 string memory errorMessage
 ) internal returns (bytes memory) {
 require(address(this).balance >= value, "Address: insufficient balance for call");
 (bool success, bytes memory returndata) = target.call{value: value}(data);
 return verifyCallResultFromTarget(target, success, returndata, errorMessage);
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
 * but performing a static call.
 *
 * _Available since v3.3._
 */
 function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
 return functionStaticCall(target, data, "Address: low-level static call failed");
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
 * but performing a static call.
 *
 * _Available since v3.3._
 */
 function functionStaticCall(
 address target,
 bytes memory data,
 string memory errorMessage
 ) internal view returns (bytes memory) {
 (bool success, bytes memory returndata) = target.staticcall(data);
 return verifyCallResultFromTarget(target, success, returndata, errorMessage);
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
 * but performing a delegate call.
 *
 * _Available since v3.4._
 */
 function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
 return functionDelegateCall(target, data, "Address: low-level delegate call failed");
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
 * but performing a delegate call.
 *
 * _Available since v3.4._
 */
 function functionDelegateCall(
 address target,
 bytes memory data,
 string memory errorMessage
 ) internal returns (bytes memory) {
 (bool success, bytes memory returndata) = target.delegatecall(data);
 return verifyCallResultFromTarget(target, success, returndata, errorMessage);
 }

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

 /**
 * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
 * revert reason or using the provided one.
 *
 * _Available since v4.3._
 */
 function verifyCallResult(
 bool success,
 bytes memory returndata,
 string memory errorMessage
 ) internal pure returns (bytes memory) {
 if (success) {
 return returndata;
 } else {
 _revert(returndata, errorMessage);
 }
 }

 function _revert(bytes memory returndata, string memory errorMessage) private pure {
 // Look for revert reason and bubble it up if present
 if (returndata.length > 0) {
 // The easiest way to bubble the revert reason is using memory via assembly
 /// @solidity memory-safe-assembly
 assembly {
 let returndata_size := mload(returndata)
 revert(add(32, returndata), returndata_size)
 }
 } else {
 revert(errorMessage);
 }
 }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
 /**
 * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
 * by `operator` from `from`, this function is called.
 *
 * It must return its Solidity selector to confirm the token transfer.
 * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
 *
 * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
 */
 function onERC721Received(
 address operator,
 address from,
 uint256 tokenId,
 bytes calldata data
 ) external returns (bytes4);
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol


// 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/utils/introspection/ERC165.sol


// 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/access/AccessControl.sol


// OpenZeppelin Contracts (last updated v4.8.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;





/**
 * @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 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]{40}) is missing role (0x[0-9a-f]{64})$/
 *
 * _Available since v4.1._
 */
 modifier onlyRole(bytes32 role) {
 _checkRole(role);
 _;
 }

 /**
 * @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 virtual override returns (bool) {
 return _roles[role].members[account];
 }

 /**
 * @dev Revert with a standard message if `_msgSender()` is missing `role`.
 * Overriding this function changes the behavior of the {onlyRole} modifier.
 *
 * Format of the revert message is described in {_checkRole}.
 *
 * _Available since v4.6._
 */
 function _checkRole(bytes32 role) internal view virtual {
 _checkRole(role, _msgSender());
 }

 /**
 * @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]{40}) is missing role (0x[0-9a-f]{64})$/
 */
 function _checkRole(bytes32 role, address account) internal view virtual {
 if (!hasRole(role, account)) {
 revert(
 string(
 abi.encodePacked(
 "AccessControl: account ",
 Strings.toHexString(account),
 " 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 virtual 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.
 *
 * May emit a {RoleGranted} event.
 */
 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.
 *
 * May emit a {RoleRevoked} event.
 */
 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 revoked `role`, emits a {RoleRevoked}
 * event.
 *
 * Requirements:
 *
 * - the caller must be `account`.
 *
 * May emit a {RoleRevoked} event.
 */
 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.
 *
 * May emit a {RoleGranted} event.
 *
 * [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}.
 * ====
 *
 * NOTE: This function is deprecated in favor of {_grantRole}.
 */
 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 {
 bytes32 previousAdminRole = getRoleAdmin(role);
 _roles[role].adminRole = adminRole;
 emit RoleAdminChanged(role, previousAdminRole, adminRole);
 }

 /**
 * @dev Grants `role` to `account`.
 *
 * Internal function without access restriction.
 *
 * May emit a {RoleGranted} event.
 */
 function _grantRole(bytes32 role, address account) internal virtual {
 if (!hasRole(role, account)) {
 _roles[role].members[account] = true;
 emit RoleGranted(role, account, _msgSender());
 }
 }

 /**
 * @dev Revokes `role` from `account`.
 *
 * Internal function without access restriction.
 *
 * May emit a {RoleRevoked} event.
 */
 function _revokeRole(bytes32 role, address account) internal virtual {
 if (hasRole(role, account)) {
 _roles[role].members[account] = false;
 emit RoleRevoked(role, account, _msgSender());
 }
 }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol


// OpenZeppelin Contracts (last updated v4.8.0) (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`.
 *
 * Requirements:
 *
 * - `from` cannot be the zero address.
 * - `to` cannot be the zero address.
 * - `tokenId` token must exist and be owned by `from`.
 * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
 * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
 *
 * Emits a {Transfer} event.
 */
 function safeTransferFrom(
 address from,
 address to,
 uint256 tokenId,
 bytes calldata data
 ) external;

 /**
 * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
 * are aware of the ERC721 protocol to prevent tokens from being forever locked.
 *
 * Requirements:
 *
 * - `from` cannot be the zero address.
 * - `to` cannot be the zero address.
 * - `tokenId` token must exist and be owned by `from`.
 * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
 * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
 *
 * Emits a {Transfer} event.
 */
 function safeTransferFrom(
 address from,
 address to,
 uint256 tokenId
 ) external;

 /**
 * @dev Transfers `tokenId` token from `from` to `to`.
 *
 * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
 * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
 * understand this adds an external call which potentially creates a reentrancy vulnerability.
 *
 * Requirements:
 *
 * - `from` cannot be the zero address.
 * - `to` cannot be the zero address.
 * - `tokenId` token must be owned by `from`.
 * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
 *
 * Emits a {Transfer} event.
 */
 function transferFrom(
 address from,
 address to,
 uint256 tokenId
 ) external;

 /**
 * @dev Gives permission to `to` to transfer `tokenId` token to another account.
 * The approval is cleared when the token is transferred.
 *
 * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
 *
 * Requirements:
 *
 * - The caller must own the token or be an approved operator.
 * - `tokenId` must exist.
 *
 * Emits an {Approval} event.
 */
 function approve(address to, uint256 tokenId) external;

 /**
 * @dev Approve or remove `operator` as an operator for the caller.
 * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
 *
 * Requirements:
 *
 * - The `operator` cannot be the caller.
 *
 * Emits an {ApprovalForAll} event.
 */
 function setApprovalForAll(address operator, bool _approved) external;

 /**
 * @dev Returns the account approved for `tokenId` token.
 *
 * Requirements:
 *
 * - `tokenId` must exist.
 */
 function getApproved(uint256 tokenId) external view returns (address operator);

 /**
 * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
 *
 * See {setApprovalForAll}
 */
 function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;


/**
 * @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);

 /**
 * @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);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol


// 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/token/ERC721/ERC721.sol


// OpenZeppelin Contracts (last updated v4.8.0) (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: address zero is not a valid owner");
 return _balances[owner];
 }

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

 /**
 * @dev See {IERC721Metadata-name}.
 */
 function name() public view virtual override returns (string memory) {
 return _name;
 }

 /**
 * @dev See {IERC721Metadata-symbol}.
 */
 function symbol() public view virtual override returns (string memory) {
 return _symbol;
 }

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

 string memory baseURI = _baseURI();
 return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
 }

 /**
 * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
 * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
 * by default, can be overridden in child contracts.
 */
 function _baseURI() internal view virtual returns (string memory) {
 return "";
 }

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

 require(
 _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
 "ERC721: approve caller is not token owner or approved for all"
 );

 _approve(to, tokenId);
 }

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

 return _tokenApprovals[tokenId];
 }

 /**
 * @dev See {IERC721-setApprovalForAll}.
 */
 function setApprovalForAll(address operator, bool approved) public virtual override {
 _setApprovalForAll(_msgSender(), operator, approved);
 }

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

 /**
 * @dev See {IERC721-transferFrom}.
 */
 function transferFrom(
 address from,
 address to,
 uint256 tokenId
 ) public virtual override {
 //solhint-disable-next-line max-line-length
 require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

 _transfer(from, to, tokenId);
 }

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

 /**
 * @dev See {IERC721-safeTransferFrom}.
 */
 function safeTransferFrom(
 address from,
 address to,
 uint256 tokenId,
 bytes memory data
 ) public virtual override {
 require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
 _safeTransfer(from, to, tokenId, data);
 }

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

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

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

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

 /**
 * @dev Safely mints `tokenId` and transfers it to `to`.
 *
 * Requirements:
 *
 * - `tokenId` must not exist.
 * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
 *
 * Emits a {Transfer} event.
 */
 function _safeMint(address to, uint256 tokenId) internal virtual {
 _safeMint(to, tokenId, "");
 }

 /**
 * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
 * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
 */
 function _safeMint(
 address to,
 uint256 tokenId,
 bytes memory data
 ) internal virtual {
 _mint(to, tokenId);
 require(
 _checkOnERC721Received(address(0), to, tokenId, data),
 "ERC721: transfer to non ERC721Receiver implementer"
 );
 }

 /**
 * @dev Mints `tokenId` and transfers it to `to`.
 *
 * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
 *
 * Requirements:
 *
 * - `tokenId` must not exist.
 * - `to` cannot be the zero address.
 *
 * Emits a {Transfer} event.
 */
 function _mint(address to, uint256 tokenId) internal virtual {
 require(to != address(0), "ERC721: mint to the zero address");
 require(!_exists(tokenId), "ERC721: token already minted");

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

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

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

 _owners[tokenId] = to;

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

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

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

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

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

 // Clear approvals
 delete _tokenApprovals[tokenId];

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

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

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

 /**
 * @dev Transfers `tokenId` from `from` to `to`.
 * As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
 *
 * Requirements:
 *
 * - `to` cannot be the zero address.
 * - `tokenId` token must be owned by `from`.
 *
 * Emits a {Transfer} event.
 */
 function _transfer(
 address from,
 address to,
 uint256 tokenId
 ) internal virtual {
 require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
 require(to != address(0), "ERC721: transfer to the zero address");

 _beforeTokenTransfer(from, to, tokenId, 1);

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

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

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

 emit Transfer(from, to, tokenId);

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

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

 /**
 * @dev Approve `operator` to operate on all of `owner` tokens
 *
 * Emits an {ApprovalForAll} event.
 */
 function _setApprovalForAll(
 address owner,
 address operator,
 bool approved
 ) internal virtual {
 require(owner != operator, "ERC721: approve to caller");
 _operatorApprovals[owner][operator] = approved;
 emit ApprovalForAll(owner, operator, approved);
 }

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

 /**
 * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
 * The call is not executed if the target address is not a contract.
 *
 * @param from address representing the previous owner of the given token ID
 * @param to target address that will receive the tokens
 * @param tokenId uint256 ID of the token to be transferred
 * @param data bytes optional data to send along with the call
 * @return bool whether the call correctly returned the expected magic value
 */
 function _checkOnERC721Received(
 address from,
 address to,
 uint256 tokenId,
 bytes memory data
 ) private returns (bool) {
 if (to.isContract()) {
 try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
 return retval == IERC721Receiver.onERC721Received.selector;
 } catch (bytes memory reason) {
 if (reason.length == 0) {
 revert("ERC721: transfer to non ERC721Receiver implementer");
 } else {
 /// @solidity memory-safe-assembly
 assembly {
 revert(add(32, reason), mload(reason))
 }
 }
 }
 } else {
 return true;
 }
 }

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

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

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol


// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Burnable.sol)

pragma solidity ^0.8.0;



/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be 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), "ERC721: caller is not token owner or approved");
 _burn(tokenId);
 }
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;


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

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

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

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

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

 return super.tokenURI(tokenId);
 }

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

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

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

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol


// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;



/**
 * @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 See {ERC721-_beforeTokenTransfer}.
 */
 function _beforeTokenTransfer(
 address from,
 address to,
 uint256 firstTokenId,
 uint256 batchSize
 ) internal virtual override {
 super._beforeTokenTransfer(from, to, firstTokenId, batchSize);

 if (batchSize > 1) {
 // Will only trigger during construction. Batch transferring (minting) is not available afterwards.
 revert("ERC721Enumerable: consecutive transfers not supported");
 }

 uint256 tokenId = firstTokenId;

 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();
 }
}

// File: contract-tkgt.sol
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;
pragma abicoder v2;

contract TinyKnightGamesTokens is ERC721, ERC721Enumerable, ERC721URIStorage, Pausable, AccessControl, ERC721Burnable, EIP712 {
 bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
 bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
 string private constant SIGNING_DOMAIN = "TinyKnightGamesTokens-Voucher";
 string private constant SIGNATURE_VERSION = "1";

 mapping (address => uint256) pendingWithdrawals;

 address payable public owner;

 constructor(address payable minter) 
 ERC721("Tiny Knight Games Tokens", "TKGT") 
 EIP712(SIGNING_DOMAIN, SIGNATURE_VERSION) 
 {
 owner = payable(msg.sender);
 _setupRole(DEFAULT_ADMIN_ROLE, owner);
 _setupRole(MINTER_ROLE, owner);
 _setupRole(PAUSER_ROLE, owner);

 _setupRole(MINTER_ROLE, minter);
 }

 /// @notice Represents an un-minted NFT, which has not yet been recorded into the blockchain. A signed voucher can be redeemed for a real NFT using the redeem function.
 struct NFTVoucher {
 /// @notice The id of the token to be redeemed. Must be unique - if another token with this ID already exists, the redeem function will revert.
 uint256 tokenId;

 /// @notice The minimum price (in wei) that the NFT creator is willing to accept for the initial sale of this NFT.
 uint256 minPrice;

 /// @notice The metadata URI to associate with this token.
 string uri;

 /// @notice the EIP-712 signature of all other fields in the NFTVoucher struct. For a voucher to be valid, it must be signed by an account with the MINTER_ROLE.
 bytes signature;
 }

 /// @notice Redeems an NFTVoucher for an actual NFT, creating it in the process.
 /// @param redeemer The address of the account which will receive the NFT upon success.
 /// @param voucher A signed NFTVoucher that describes the NFT to be redeemed.
 function redeem(address redeemer, NFTVoucher calldata voucher) public payable returns (uint256) {
 // make sure signature is valid and get the address of the signer
 address signer = _verify(voucher);

 // make sure that the signer is authorized to mint NFTs
 require(hasRole(MINTER_ROLE, signer), "Signature invalid or unauthorized");

 // make sure that the redeemer is paying enough to cover the buyer's cost
 require(msg.value >= voucher.minPrice, "Insufficient funds to redeem");

 // first assign the token to the signer, to establish provenance on-chain
 _mint(signer, voucher.tokenId);
 _setTokenURI(voucher.tokenId, voucher.uri);
 
 // transfer the token to the redeemer
 _transfer(signer, redeemer, voucher.tokenId);

 // record payment to owner's withdrawal balance
 pendingWithdrawals[owner] += msg.value;

 return voucher.tokenId;
 }

 /// @notice Transfers all pending withdrawal balance to the caller. Reverts if the caller is not an authorized minter.
 function withdraw() public {
 require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "Only authorized users can withdraw");
 
 uint amount = pendingWithdrawals[owner];
 // zero account before transfer to prevent re-entrancy attack
 pendingWithdrawals[owner] = 0;
 owner.transfer(amount);
 }

 /// @notice Retuns the amount of Ether available to the caller to withdraw.
 function availableToWithdraw() public view returns (uint256) {
 return pendingWithdrawals[msg.sender];
 }

 /// @notice Returns a hash of the given NFTVoucher, prepared using EIP712 typed data hashing rules.
 /// @param voucher An NFTVoucher to hash.
 function _hash(NFTVoucher calldata voucher) internal view returns (bytes32) {
 return _hashTypedDataV4(keccak256(abi.encode(
 keccak256("NFTVoucher(uint256 tokenId,uint256 minPrice,string uri)"),
 voucher.tokenId,
 voucher.minPrice,
 keccak256(bytes(voucher.uri))
 )));
 }

 /// @notice Returns the chain id of the current blockchain.
 /// @dev This is used to workaround an issue with ganache returning different values from the on-chain chainid() function and
 /// the eth_chainId RPC method. See https://github.com/protocol/nft-website/issues/121 for context.
 function getChainID() external view returns (uint256) {
 uint256 id;
 assembly {
 id := chainid()
 }
 return id;
 }

 /// @notice Verifies the signature for a given NFTVoucher, returning the address of the signer.
 /// @dev Will revert if the signature is invalid. Does not verify that the signer is authorized to mint NFTs.
 /// @param voucher An NFTVoucher describing an unminted NFT.
 function _verify(NFTVoucher calldata voucher) internal view returns (address) {
 bytes32 digest = _hash(voucher);
 return ECDSA.recover(digest, voucher.signature);
 }

 function pause() public onlyRole(PAUSER_ROLE) {
 _pause();
 }

 function unpause() public onlyRole(PAUSER_ROLE) {
 _unpause();
 }

 function safeMint(address to, uint256 tokenId, string memory uri)
 public
 onlyRole(DEFAULT_ADMIN_ROLE)
 {
 _safeMint(to, tokenId);
 _setTokenURI(tokenId, uri);
 }

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

 // The following functions are overrides required by Solidity.

 function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
 super._burn(tokenId);
 }

 function tokenURI(uint256 tokenId)
 public
 view
 override(ERC721, ERC721URIStorage)
 returns (string memory)
 {
 return super.tokenURI(tokenId);
 }

 function supportsInterface(bytes4 interfaceId)
 public
 view
 virtual
 override(ERC721, ERC721Enumerable, AccessControl)
 returns (bool)
 {
 return super.supportsInterface(interfaceId);
 }
}

Contract ABI:

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