Contract 0xc3d01e6F6b1EDF8383CA3Ba6940F212BAEd28Ea6

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0 BTT
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0x75d332ae57dae6c50b2b72d8dec1b4c4ad8a2e5d9ad62c223408cedd3fee4caf0x60806040148422002022-11-22 8:05:3176 days 10 hrs ago0x31003c2d5685c7d28d7174c3255307eb9a0f3015 IN  Create: Membership0 BTT1,551.0996
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Contract Source Code Verified (Exact Match)

Contract Name:
Membership

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 17 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @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 2 of 17 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 3 of 17 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * 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 4 of 17 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// 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 5 of 17 : Address.sol
// SPDX-License-Identifier: MIT
// 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 6 of 17 : Context.sol
// SPDX-License-Identifier: MIT
// 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 7 of 17 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 8 of 17 : IERC165.sol
// SPDX-License-Identifier: MIT
// 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 9 of 17 : Math.sol
// SPDX-License-Identifier: MIT
// 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 10 of 17 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @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 11 of 17 : IERC3525.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

/**
 * @title ERC-3525 Semi-Fungible Token Standard
 * @dev See https://eips.ethereum.org/EIPS/eip-3525
 * Note: the ERC-165 identifier for this interface is 0xc97ae3d5.
 */
interface IERC3525 is IERC165, IERC721 {
    /**
     * @dev MUST emit when value of a token is transferred to another token with the same slot,
     *  including zero value transfers (_value == 0) as well as transfers when tokens are created
     *  (`_fromTokenId` == 0) or destroyed (`_toTokenId` == 0).
     * @param _fromTokenId The token id to transfer value from
     * @param _toTokenId The token id to transfer value to
     * @param _value The transferred value
     */
    event TransferValue(
        uint256 indexed _fromTokenId,
        uint256 indexed _toTokenId,
        uint256 _value
    );

    /**
     * @dev MUST emits when the approval value of a token is set or changed.
     * @param _tokenId The token to approve
     * @param _operator The operator to approve for
     * @param _value The maximum value that `_operator` is allowed to manage
     */
    event ApprovalValue(
        uint256 indexed _tokenId,
        address indexed _operator,
        uint256 _value
    );

    /**
     * @dev MUST emit when the slot of a token is set or changed.
     * @param _tokenId The token of which slot is set or changed
     * @param _oldSlot The previous slot of the token
     * @param _newSlot The updated slot of the token
     */
    event SlotChanged(
        uint256 indexed _tokenId,
        uint256 indexed _oldSlot,
        uint256 indexed _newSlot
    );

    /**
     * @notice Get the number of decimals the token uses for value - e.g. 6, means the user
     *  representation of the value of a token can be calculated by dividing it by 1,000,000.
     *  Considering the compatibility with third-party wallets, this function is defined as
     *  `valueDecimals()` instead of `decimals()` to avoid conflict with ERC20 tokens.
     * @return The number of decimals for value
     */
    function valueDecimals() external view returns (uint8);

    /**
     * @notice Get the value of a token.
     * @param _tokenId The token for which to query the balance
     * @return The value of `_tokenId`
     */
    function balanceOf(uint256 _tokenId) external view returns (uint256);

    /**
     * @notice Get the slot of a token.
     * @param _tokenId The identifier for a token
     * @return The slot of the token
     */
    function slotOf(uint256 _tokenId) external view returns (uint256);

    /**
     * @notice Allow an operator to manage the value of a token, up to the `_value` amount.
     * @dev MUST revert unless caller is the current owner, an authorized operator, or the approved
     *  address for `_tokenId`.
     *  MUST emit ApprovalValue event.
     * @param _tokenId The token to approve
     * @param _operator The operator to be approved
     * @param _value The maximum value of `_toTokenId` that `_operator` is allowed to manage
     */
    function approve(
        uint256 _tokenId,
        address _operator,
        uint256 _value
    ) external;

    /**
     * @notice Get the maximum value of a token that an operator is allowed to manage.
     * @param _tokenId The token for which to query the allowance
     * @param _operator The address of an operator
     * @return The current approval value of `_tokenId` that `_operator` is allowed to manage
     */
    function allowance(
        uint256 _tokenId,
        address _operator
    ) external view returns (uint256);

    /**
     * @notice Transfer value from a specified token to another specified token with the same slot.
     * @dev Caller MUST be the current owner, an authorized operator or an operator who has been
     *  approved the whole `_fromTokenId` or part of it.
     *  MUST revert if `_fromTokenId` or `_toTokenId` is zero token id or does not exist.
     *  MUST revert if slots of `_fromTokenId` and `_toTokenId` do not match.
     *  MUST revert if `_value` exceeds the balance of `_fromTokenId` or its allowance to the
     *  operator.
     *  MUST emit `TransferValue` event.
     * @param _fromTokenId The token to transfer value from
     * @param _toTokenId The token to transfer value to
     * @param _value The transferred value
     */
    function transferFrom(
        uint256 _fromTokenId,
        uint256 _toTokenId,
        uint256 _value
    ) external;

    /**
     * @notice Transfer value from a specified token to an address. The caller should confirm that
     *  `_to` is capable of receiving ERC3525 tokens.
     * @dev This function MUST create a new ERC3525 token with the same slot for `_to` to receive
     *  the transferred value.
     *  MUST revert if `_fromTokenId` is zero token id or does not exist.
     *  MUST revert if `_to` is zero address.
     *  MUST revert if `_value` exceeds the balance of `_fromTokenId` or its allowance to the
     *  operator.
     *  MUST emit `Transfer` and `TransferValue` events.
     * @param _fromTokenId The token to transfer value from
     * @param _to The address to transfer value to
     * @param _value The transferred value
     * @return ID of the new token created for `_to` which receives the transferred value
     */
    function transferFrom(
        uint256 _fromTokenId,
        address _to,
        uint256 _value
    ) external returns (uint256);
}

File 12 of 17 : IERC3525Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "./IERC3525.sol";

/**
 * @title ERC-3525 Semi-Fungible Token Standard, optional extension for metadata
 * @dev Interfaces for any contract that wants to support query of the Uniform Resource Identifier
 *  (URI) for the ERC3525 contract as well as a specified slot.
 *  Because of the higher reliability of data stored in smart contracts compared to data stored in
 *  centralized systems, it is recommended that metadata, including `contractURI`, `slotURI` and
 *  `tokenURI`, be directly returned in JSON format, instead of being returned with a url pointing
 *  to any resource stored in a centralized system.
 *  See https://eips.ethereum.org/EIPS/eip-3525
 * Note: the ERC-165 identifier for this interface is 0xe1600902.
 */
interface IERC3525Metadata is IERC3525, IERC721Metadata {
    /**
     * @notice Returns the Uniform Resource Identifier (URI) for the current ERC3525 contract.
     * @dev This function SHOULD return the URI for this contract in JSON format, starting with
     *  header `data:application/json;`.
     *  See https://eips.ethereum.org/EIPS/eip-3525 for the JSON schema for contract URI.
     * @return The JSON formatted URI of the current ERC3525 contract
     */
    function contractURI() external view returns (string memory);

    /**
     * @notice Returns the Uniform Resource Identifier (URI) for the specified slot.
     * @dev This function SHOULD return the URI for `_slot` in JSON format, starting with header
     *  `data:application/json;`.
     *  See https://eips.ethereum.org/EIPS/eip-3525 for the JSON schema for slot URI.
     * @return The JSON formatted URI of `_slot`
     */
    function slotURI(uint256 _slot) external view returns (string memory);
}

File 13 of 17 : IERC3525MetadataDescriptor.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IERC3525MetadataDescriptor {
    function constructContractURI() external view returns (string memory);

    function constructSlotURI(
        uint256 slot
    ) external view returns (string memory);

    function constructTokenURI(
        uint256 tokenId
    ) external view returns (string memory);
}

File 14 of 17 : IERC3525Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title EIP-3525 token receiver interface
 * @dev Interface for a smart contract that wants to be informed by EIP-3525 contracts when
 *  receiving values from ANY addresses or EIP-3525 tokens.
 * Note: the EIP-165 identifier for this interface is 0x009ce20b.
 */
interface IERC3525Receiver {
    /**
     * @notice Handle the receipt of an EIP-3525 token value.
     * @dev An EIP-3525 smart contract MUST check whether this function is implemented by the
     *  recipient contract, if the recipient contract implements this function, the EIP-3525
     *  contract MUST call this function after a value transfer (i.e. `transferFrom(uint256,
     *  uint256,uint256,bytes)`).
     *  MUST return 0x009ce20b (i.e. `bytes4(keccak256('onERC3525Received(address,uint256,uint256,
     *  uint256,bytes)'))`) if the transfer is accepted.
     *  MUST revert or return any value other than 0x009ce20b if the transfer is rejected.
     * @param _operator The address which triggered the transfer
     * @param _fromTokenId The token id to transfer value from
     * @param _toTokenId The token id to transfer value to
     * @param _value The transferred value
     * @param _data Additional data with no specified format
     * @return `bytes4(keccak256('onERC3525Received(address,uint256,uint256,uint256,bytes)'))`
     *  unless the transfer is rejected.
     */
    function onERC3525Received(
        address _operator,
        uint256 _fromTokenId,
        uint256 _toTokenId,
        uint256 _value,
        bytes calldata _data
    ) external returns (bytes4);
}

File 15 of 17 : IManagement.sol
// SPDX-License-Identifier: None
pragma solidity ^0.8.0;

/**
   @title IManagement contract
   @dev Provide interfaces that allow interaction to Management contract
*/
interface IManagement {
    function treasury() external view returns (address);

    function hasRole(
        bytes32 role,
        address account
    ) external view returns (bool);

    function paymentTokens(address _token) external view returns (bool);

    function paused() external view returns (bool);
}

File 16 of 17 : Membership.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./interfaces/IManagement.sol";
import "./utils/ERC3525.sol";

contract Membership is ERC3525 {
    bytes32 private constant MANAGER_ROLE = keccak256("MANAGER_ROLE");
    bytes32 private constant MINTER_ROLE = keccak256("MINTER_ROLE");

    IManagement public management;
    //  Max tier per type (loyalty_type => max_tier)
    mapping(uint256 => uint256) public maxTiers;

    //  Requiring points per tier (loyalty_type => tier_no => points)
    mapping(uint256 => mapping(uint256 => uint256)) public requirements;

    //  Mapping current Tier to an account (address => loyalty_type => tier_no)
    mapping(address => mapping(uint256 => uint256)) public tiers;

    //  TokenURI = baseURI + tokenId.toString()
    string public baseURI;

    modifier onlyManager() {
        require(management.hasRole(MANAGER_ROLE, _msgSender()), "Only Manager");
        _;
    }

    modifier onlyMinter() {
        require(management.hasRole(MINTER_ROLE, _msgSender()), "Only Minter");
        _;
    }

    modifier onPaused() {
        require(!management.paused(), "On Paused");
        _;
    }

    modifier disabled() {
        _;
        revert("Membership: transfer is disabled");
    }

    event Cancel(uint256 memberId);
    event Registration(
        address indexed member,
        uint256 indexed memberId,
        uint256 indexed typeOf,
        uint256 value
    );
    event UpdatePoint(uint256 indexed memberId, uint256 oValue, uint256 nValue);
    event Upgraded(
        address indexed member,
        uint256 indexed memberId,
        uint256 indexed typeOf,
        uint256 oTier,
        uint256 nTier
    );

    constructor(
        IManagement _management,
        string memory name,
        string memory symbol,
        string memory baseURI_,
        uint8 decimals_
    ) ERC3525(name, symbol, decimals_) {
        management = _management;
        baseURI = baseURI_;
    }

    function updateBaseURI(string calldata _uri) external onlyManager {
        baseURI = _uri;
    }

    function config(
        uint256 _type,
        uint256[] calldata _values
    ) external onlyManager {
        //  Should allow update tier's requirements ????
        uint256 _currentMaxTier = maxTiers[_type];
        uint256 _maxTiers = _values.length;
        uint256 _max;
        uint256 _value;
        for (uint256 i; i < _maxTiers; i++) {
            _value = _values[i];
            require(_value > _max, "Not ascending order");
            _max = _value;
            requirements[_type][i + 1] = _values[i];
        }

        maxTiers[_type] = _maxTiers;

        if (_maxTiers < _currentMaxTier) {
            _value = _currentMaxTier - _maxTiers;
            for (uint256 i; i < _value; i++)
                delete requirements[_type][_maxTiers + i + 1];
        }
    }

    function upgrade(uint256 _memberId) external {
        address _caller = _msgSender();
        require(ownerOf(_memberId) == _caller, "Member Id not owned by caller");

        uint256 _typeOf = slotOf(_memberId);
        uint256 _maxTiers = maxTiers[_typeOf];
        uint256 _tier = tiers[_caller][_typeOf];
        require(
            _tier < _maxTiers,
            "Cannot upgrade to the next tier. You have reached a max tier"
        );

        uint256 nextTier_ = _nextTier(
            balanceOf(_memberId),
            _typeOf,
            _tier,
            _maxTiers
        );
        require(nextTier_ > _tier, "Not enough points to upgrade");
        tiers[_caller][_typeOf] = nextTier_;

        emit Upgraded(_caller, _memberId, _typeOf, _tier, nextTier_);
    }

    function addMembership(
        address _account,
        uint256 _memberId,
        uint256 _type,
        uint256 _value
    ) external onlyMinter {
        _mint(_account, _memberId, _type, _value);

        emit Registration(_account, _memberId, _type, _value);
    }

    function updatePoint(
        uint256 _memberId,
        uint256 _value,
        bool _isAdded
    ) external onlyMinter {
        uint256 _oPoint = balanceOf(_memberId);
        if (_isAdded) _mintValue(_memberId, _value);
        else _burnValue(_memberId, _value);
        uint256 _nPoint = balanceOf(_memberId);

        emit UpdatePoint(_memberId, _oPoint, _nPoint);
    }

    function cancelMembership(uint256 _memberId) external onlyMinter {
        _burn(_memberId);

        emit Cancel(_memberId);
    }

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

    function _nextTier(
        uint256 _balance,
        uint256 _typeOf,
        uint256 _tier,
        uint256 _maxTiers
    ) private view returns (uint256) {
        uint256 _nextRequirement = requirements[_typeOf][_maxTiers];
        uint256 _mid;
        if (_balance >= _nextRequirement) return _maxTiers;

        uint256 _lo = _tier;
        uint256 _hi = _maxTiers;
        while (_lo <= _hi) {
            _mid = (_lo + _hi) / 2;
            _nextRequirement = requirements[_typeOf][_mid];
            if (_balance < _nextRequirement) {
                _hi = _mid - 1;
            } else if (_balance > _nextRequirement) {
                _lo = _mid + 1;
            } else {
                return _mid;
            }
        }
        return _hi;
    }

    function _beforeValueTransfer(
        address _from,
        address _to,
        uint256 _fromTokenId,
        uint256 _toTokenId,
        uint256 _slot,
        uint256 _value
    ) internal override onPaused {
        super._beforeValueTransfer(
            _from,
            _to,
            _fromTokenId,
            _toTokenId,
            _slot,
            _value
        );
    }

    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _memberId,
        bytes memory _data
    ) public override disabled {}

    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _memberId
    ) public override disabled {}

    function transferFrom(
        address _from,
        address _to,
        uint256 _memberId
    ) public override disabled {}

    function transferFrom(
        uint256 _fromMemberId,
        uint256 _toMemberId,
        uint256 _value
    ) public override disabled {}

    function transferFrom(
        uint256 _fromMemberId,
        address _to,
        uint256 _value
    ) public override disabled returns (uint256) {}
}

File 17 of 17 : ERC3525.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "../interfaces/IERC3525.sol";
import "../interfaces/IERC3525Receiver.sol";
import "../interfaces/IERC3525Metadata.sol";
import "../interfaces/IERC3525MetadataDescriptor.sol";

contract ERC3525 is Context, IERC3525Metadata, IERC721Enumerable {
    using Strings for address;
    using Strings for uint256;
    using Address for address;

    event SetMetadataDescriptor(address indexed metadataDescriptor);

    struct TokenData {
        uint256 id;
        uint256 slot;
        uint256 balance;
        address owner;
        address approved;
        address[] valueApprovals;
    }

    struct AddressData {
        uint256[] ownedTokens;
        mapping(uint256 => uint256) ownedTokensIndex;
        mapping(address => bool) approvals;
    }

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    mapping(uint256 => mapping(address => uint256)) private _approvedValues;
    TokenData[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;
    mapping(address => AddressData) private _addressData;
    IERC3525MetadataDescriptor public metadataDescriptor;

    constructor(string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
    }

    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override returns (bool) {
        return
            interfaceId == type(IERC165).interfaceId ||
            interfaceId == type(IERC3525).interfaceId ||
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC3525Metadata).interfaceId ||
            interfaceId == type(IERC721Enumerable).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function valueDecimals() public view virtual override returns (uint8) {
        return _decimals;
    }

    function balanceOf(
        uint256 tokenId_
    ) public view virtual override returns (uint256) {
        _requireMinted(tokenId_);
        return _allTokens[_allTokensIndex[tokenId_]].balance;
    }

    function ownerOf(
        uint256 tokenId_
    ) public view virtual override returns (address owner_) {
        _requireMinted(tokenId_);
        owner_ = _allTokens[_allTokensIndex[tokenId_]].owner;
        require(owner_ != address(0), "ERC3525: invalid token ID");
    }

    function slotOf(
        uint256 tokenId_
    ) public view virtual override returns (uint256) {
        _requireMinted(tokenId_);
        return _allTokens[_allTokensIndex[tokenId_]].slot;
    }

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

    function contractURI()
        public
        view
        virtual
        override
        returns (string memory)
    {
        string memory baseURI = _baseURI();
        return
            address(metadataDescriptor) != address(0)
                ? metadataDescriptor.constructContractURI()
                : bytes(baseURI).length > 0
                ? string(
                    abi.encodePacked(
                        baseURI,
                        "contract/",
                        Strings.toHexString(address(this))
                    )
                )
                : "";
    }

    function slotURI(
        uint256 slot_
    ) public view virtual override returns (string memory) {
        string memory baseURI = _baseURI();
        return
            address(metadataDescriptor) != address(0)
                ? metadataDescriptor.constructSlotURI(slot_)
                : bytes(baseURI).length > 0
                ? string(abi.encodePacked(baseURI, "slot/", slot_.toString()))
                : "";
    }

    function tokenURI(
        uint256 tokenId_
    ) public view virtual override returns (string memory) {
        _requireMinted(tokenId_);
        string memory baseURI = _baseURI();
        return
            address(metadataDescriptor) != address(0)
                ? metadataDescriptor.constructTokenURI(tokenId_)
                : bytes(baseURI).length > 0
                ? string(abi.encodePacked(baseURI, tokenId_.toString()))
                : "";
    }

    function approve(
        uint256 tokenId_,
        address to_,
        uint256 value_
    ) public virtual override {
        address owner = ERC3525.ownerOf(tokenId_);
        require(to_ != owner, "ERC3525: approval to current owner");

        require(
            _msgSender() == owner ||
                ERC3525.isApprovedForAll(owner, _msgSender()),
            "ERC3525: approve caller is not owner nor approved for all"
        );

        _approveValue(tokenId_, to_, value_);
    }

    function allowance(
        uint256 tokenId_,
        address operator_
    ) public view virtual override returns (uint256) {
        _requireMinted(tokenId_);
        return _approvedValues[tokenId_][operator_];
    }

    function transferFrom(
        uint256 fromTokenId_,
        address to_,
        uint256 value_
    ) public virtual override returns (uint256) {
        _spendAllowance(_msgSender(), fromTokenId_, value_);

        uint256 newTokenId = _createDerivedTokenId(fromTokenId_);
        _mint(to_, newTokenId, ERC3525.slotOf(fromTokenId_), 0);
        _transferValue(fromTokenId_, newTokenId, value_);

        return newTokenId;
    }

    function transferFrom(
        uint256 fromTokenId_,
        uint256 toTokenId_,
        uint256 value_
    ) public virtual override {
        _spendAllowance(_msgSender(), fromTokenId_, value_);
        _transferValue(fromTokenId_, toTokenId_, value_);
    }

    function balanceOf(
        address owner_
    ) public view virtual override returns (uint256 balance) {
        require(
            owner_ != address(0),
            "ERC3525: balance query for the zero address"
        );
        return _addressData[owner_].ownedTokens.length;
    }

    function transferFrom(
        address from_,
        address to_,
        uint256 tokenId_
    ) public virtual override {
        require(
            _isApprovedOrOwner(_msgSender(), tokenId_),
            "ERC3525: transfer caller is not owner nor approved"
        );
        _transferTokenId(from_, to_, tokenId_);
    }

    function safeTransferFrom(
        address from_,
        address to_,
        uint256 tokenId_,
        bytes memory data_
    ) public virtual override {
        require(
            _isApprovedOrOwner(_msgSender(), tokenId_),
            "ERC3525: transfer caller is not owner nor approved"
        );
        _safeTransferTokenId(from_, to_, tokenId_, data_);
    }

    function safeTransferFrom(
        address from_,
        address to_,
        uint256 tokenId_
    ) public virtual override {
        safeTransferFrom(from_, to_, tokenId_, "");
    }

    function approve(address to_, uint256 tokenId_) public virtual override {
        address owner = ERC3525.ownerOf(tokenId_);
        require(to_ != owner, "ERC3525: approval to current owner");

        require(
            _msgSender() == owner ||
                ERC3525.isApprovedForAll(owner, _msgSender()),
            "ERC3525: approve caller is not owner nor approved for all"
        );

        _approve(to_, tokenId_);
    }

    function getApproved(
        uint256 tokenId_
    ) public view virtual override returns (address) {
        _requireMinted(tokenId_);
        return _allTokens[_allTokensIndex[tokenId_]].approved;
    }

    function setApprovalForAll(
        address operator_,
        bool approved_
    ) public virtual override {
        _setApprovalForAll(_msgSender(), operator_, approved_);
    }

    function isApprovedForAll(
        address owner_,
        address operator_
    ) public view virtual override returns (bool) {
        return _addressData[owner_].approvals[operator_];
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    function tokenByIndex(
        uint256 index_
    ) public view virtual override returns (uint256) {
        require(
            index_ < ERC3525.totalSupply(),
            "ERC3525: global index out of bounds"
        );
        return _allTokens[index_].id;
    }

    function tokenOfOwnerByIndex(
        address owner_,
        uint256 index_
    ) public view virtual override returns (uint256) {
        require(
            index_ < ERC3525.balanceOf(owner_),
            "ERC3525: owner index out of bounds"
        );
        return _addressData[owner_].ownedTokens[index_];
    }

    function _setApprovalForAll(
        address owner_,
        address operator_,
        bool approved_
    ) internal virtual {
        require(owner_ != operator_, "ERC3525: approve to caller");

        _addressData[owner_].approvals[operator_] = approved_;

        emit ApprovalForAll(owner_, operator_, approved_);
    }

    function _isApprovedOrOwner(
        address operator_,
        uint256 tokenId_
    ) internal view virtual returns (bool) {
        _requireMinted(tokenId_);
        address owner = ERC3525.ownerOf(tokenId_);
        return (operator_ == owner ||
            ERC3525.isApprovedForAll(owner, operator_) ||
            ERC3525.getApproved(tokenId_) == operator_);
    }

    function _spendAllowance(
        address operator_,
        uint256 tokenId_,
        uint256 value_
    ) internal virtual {
        uint256 currentAllowance = ERC3525.allowance(tokenId_, operator_);
        if (
            !_isApprovedOrOwner(operator_, tokenId_) &&
            currentAllowance != type(uint256).max
        ) {
            require(
                currentAllowance >= value_,
                "ERC3525: insufficient allowance"
            );
            _approveValue(tokenId_, operator_, currentAllowance - value_);
        }
    }

    function _exists(uint256 tokenId_) internal view virtual returns (bool) {
        return
            _allTokens.length != 0 &&
            _allTokens[_allTokensIndex[tokenId_]].id == tokenId_;
    }

    function _requireMinted(uint256 tokenId_) internal view virtual {
        require(_exists(tokenId_), "ERC3525: invalid token ID");
    }

    function _mint(
        address to_,
        uint256 slot_,
        uint256 value_
    ) internal virtual returns (uint256) {
        uint256 tokenId = _createOriginalTokenId();
        _mint(to_, tokenId, slot_, value_);
        return tokenId;
    }

    function _mint(
        address to_,
        uint256 tokenId_,
        uint256 slot_,
        uint256 value_
    ) internal virtual {
        require(to_ != address(0), "ERC3525: mint to the zero address");
        require(tokenId_ != 0, "ERC3525: cannot mint zero tokenId");
        require(!_exists(tokenId_), "ERC3525: token already minted");

        _beforeValueTransfer(address(0), to_, 0, tokenId_, slot_, value_);
        __mintToken(to_, tokenId_, slot_);
        __mintValue(tokenId_, value_);
        _afterValueTransfer(address(0), to_, 0, tokenId_, slot_, value_);
    }

    function _mintValue(uint256 tokenId_, uint256 value_) internal virtual {
        _requireMinted(tokenId_);

        address owner = ERC3525.ownerOf(tokenId_);
        uint256 slot = ERC3525.slotOf(tokenId_);
        _beforeValueTransfer(address(0), owner, 0, tokenId_, slot, value_);
        __mintValue(tokenId_, value_);
        _afterValueTransfer(address(0), owner, 0, tokenId_, slot, value_);
    }

    function __mintValue(uint256 tokenId_, uint256 value_) private {
        _allTokens[_allTokensIndex[tokenId_]].balance += value_;
        emit TransferValue(0, tokenId_, value_);
    }

    function __mintToken(address to_, uint256 tokenId_, uint256 slot_) private {
        TokenData memory tokenData = TokenData({
            id: tokenId_,
            slot: slot_,
            balance: 0,
            owner: to_,
            approved: address(0),
            valueApprovals: new address[](0)
        });

        _addTokenToAllTokensEnumeration(tokenData);
        _addTokenToOwnerEnumeration(to_, tokenId_);

        emit Transfer(address(0), to_, tokenId_);
        emit SlotChanged(tokenId_, 0, slot_);
    }

    function _burn(uint256 tokenId_) internal virtual {
        _requireMinted(tokenId_);

        TokenData storage tokenData = _allTokens[_allTokensIndex[tokenId_]];
        address owner = tokenData.owner;
        uint256 slot = tokenData.slot;
        uint256 value = tokenData.balance;

        _beforeValueTransfer(owner, address(0), tokenId_, 0, slot, value);

        _clearApprovedValues(tokenId_);
        _removeTokenFromOwnerEnumeration(owner, tokenId_);
        _removeTokenFromAllTokensEnumeration(tokenId_);

        emit TransferValue(tokenId_, 0, value);
        emit SlotChanged(tokenId_, slot, 0);
        emit Transfer(owner, address(0), tokenId_);

        _afterValueTransfer(owner, address(0), tokenId_, 0, slot, value);
    }

    function _burnValue(uint256 tokenId_, uint256 burnValue_) internal virtual {
        _requireMinted(tokenId_);

        TokenData storage tokenData = _allTokens[_allTokensIndex[tokenId_]];
        address owner = tokenData.owner;
        uint256 slot = tokenData.slot;
        uint256 value = tokenData.balance;

        require(value >= burnValue_, "ERC3525: burn value exceeds balance");

        _beforeValueTransfer(owner, address(0), tokenId_, 0, slot, burnValue_);

        tokenData.balance -= burnValue_;
        emit TransferValue(tokenId_, 0, burnValue_);

        _afterValueTransfer(owner, address(0), tokenId_, 0, slot, burnValue_);
    }

    function _addTokenToOwnerEnumeration(
        address to_,
        uint256 tokenId_
    ) private {
        _allTokens[_allTokensIndex[tokenId_]].owner = to_;

        _addressData[to_].ownedTokensIndex[tokenId_] = _addressData[to_]
            .ownedTokens
            .length;
        _addressData[to_].ownedTokens.push(tokenId_);
    }

    function _removeTokenFromOwnerEnumeration(
        address from_,
        uint256 tokenId_
    ) private {
        _allTokens[_allTokensIndex[tokenId_]].owner = address(0);

        AddressData storage ownerData = _addressData[from_];
        uint256 lastTokenIndex = ownerData.ownedTokens.length - 1;
        uint256 lastTokenId = ownerData.ownedTokens[lastTokenIndex];
        uint256 tokenIndex = ownerData.ownedTokensIndex[tokenId_];

        ownerData.ownedTokens[tokenIndex] = lastTokenId;
        ownerData.ownedTokensIndex[lastTokenId] = tokenIndex;

        delete ownerData.ownedTokensIndex[tokenId_];
        ownerData.ownedTokens.pop();
    }

    function _addTokenToAllTokensEnumeration(
        TokenData memory tokenData_
    ) private {
        _allTokensIndex[tokenData_.id] = _allTokens.length;
        _allTokens.push(tokenData_);
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId_) private {
        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId_];

        TokenData memory lastTokenData = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenData;
        _allTokensIndex[lastTokenData.id] = tokenIndex;

        delete _allTokensIndex[tokenId_];
        _allTokens.pop();
    }

    function _approve(address to_, uint256 tokenId_) internal virtual {
        _allTokens[_allTokensIndex[tokenId_]].approved = to_;
        emit Approval(ERC3525.ownerOf(tokenId_), to_, tokenId_);
    }

    function _approveValue(
        uint256 tokenId_,
        address to_,
        uint256 value_
    ) internal virtual {
        require(
            to_ != address(0),
            "ERC3525: approve value to the zero address"
        );
        if (!_existApproveValue(to_, tokenId_)) {
            _allTokens[_allTokensIndex[tokenId_]].valueApprovals.push(to_);
        }
        _approvedValues[tokenId_][to_] = value_;

        emit ApprovalValue(tokenId_, to_, value_);
    }

    function _clearApprovedValues(uint256 tokenId_) internal virtual {
        TokenData storage tokenData = _allTokens[_allTokensIndex[tokenId_]];
        uint256 length = tokenData.valueApprovals.length;
        for (uint256 i = 0; i < length; i++) {
            address approval = tokenData.valueApprovals[i];
            delete _approvedValues[tokenId_][approval];
        }
    }

    function _existApproveValue(
        address to_,
        uint256 tokenId_
    ) internal view virtual returns (bool) {
        uint256 length = _allTokens[_allTokensIndex[tokenId_]]
            .valueApprovals
            .length;
        for (uint256 i = 0; i < length; i++) {
            if (
                _allTokens[_allTokensIndex[tokenId_]].valueApprovals[i] == to_
            ) {
                return true;
            }
        }
        return false;
    }

    function _transferValue(
        uint256 fromTokenId_,
        uint256 toTokenId_,
        uint256 value_
    ) internal virtual {
        require(
            _exists(fromTokenId_),
            "ERC3525: transfer from invalid token ID"
        );
        require(_exists(toTokenId_), "ERC3525: transfer to invalid token ID");

        TokenData storage fromTokenData = _allTokens[
            _allTokensIndex[fromTokenId_]
        ];
        TokenData storage toTokenData = _allTokens[_allTokensIndex[toTokenId_]];

        require(
            fromTokenData.balance >= value_,
            "ERC3525: insufficient balance for transfer"
        );
        require(
            fromTokenData.slot == toTokenData.slot,
            "ERC3525: transfer to token with different slot"
        );

        _beforeValueTransfer(
            fromTokenData.owner,
            toTokenData.owner,
            fromTokenId_,
            toTokenId_,
            fromTokenData.slot,
            value_
        );

        fromTokenData.balance -= value_;
        toTokenData.balance += value_;

        emit TransferValue(fromTokenId_, toTokenId_, value_);

        _afterValueTransfer(
            fromTokenData.owner,
            toTokenData.owner,
            fromTokenId_,
            toTokenId_,
            fromTokenData.slot,
            value_
        );

        require(
            _checkOnERC3525Received(fromTokenId_, toTokenId_, value_, ""),
            "ERC3525: transfer to non ERC3525Receiver"
        );
    }

    function _transferTokenId(
        address from_,
        address to_,
        uint256 tokenId_
    ) internal virtual {
        require(
            ERC3525.ownerOf(tokenId_) == from_,
            "ERC3525: transfer from invalid owner"
        );
        require(to_ != address(0), "ERC3525: transfer to the zero address");

        uint256 slot = ERC3525.slotOf(tokenId_);
        uint256 value = ERC3525.balanceOf(tokenId_);

        _beforeValueTransfer(from_, to_, tokenId_, tokenId_, slot, value);

        _approve(address(0), tokenId_);
        _clearApprovedValues(tokenId_);

        _removeTokenFromOwnerEnumeration(from_, tokenId_);
        _addTokenToOwnerEnumeration(to_, tokenId_);

        emit Transfer(from_, to_, tokenId_);

        _afterValueTransfer(from_, to_, tokenId_, tokenId_, slot, value);
    }

    function _safeTransferTokenId(
        address from_,
        address to_,
        uint256 tokenId_,
        bytes memory data_
    ) internal virtual {
        _transferTokenId(from_, to_, tokenId_);
        require(
            _checkOnERC721Received(from_, to_, tokenId_, data_),
            "ERC3525: transfer to non ERC721Receiver"
        );
    }

    function _checkOnERC3525Received(
        uint256 fromTokenId_,
        uint256 toTokenId_,
        uint256 value_,
        bytes memory data_
    ) private returns (bool) {
        address to = ERC3525.ownerOf(toTokenId_);
        if (
            to.isContract() &&
            IERC165(to).supportsInterface(type(IERC3525Receiver).interfaceId)
        ) {
            try
                IERC3525Receiver(to).onERC3525Received(
                    _msgSender(),
                    fromTokenId_,
                    toTokenId_,
                    value_,
                    data_
                )
            returns (bytes4 retval) {
                return retval == IERC3525Receiver.onERC3525Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC3525: transfer to non ERC3525Receiver");
                } else {
                    // solhint-disable-next-line
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    function _checkOnERC721Received(
        address from_,
        address to_,
        uint256 tokenId_,
        bytes memory data_
    ) private returns (bool) {
        if (
            to_.isContract() &&
            IERC165(to_).supportsInterface(type(IERC721Receiver).interfaceId)
        ) {
            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");
                } else {
                    // solhint-disable-next-line
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /* solhint-disable */
    function _beforeValueTransfer(
        address from_,
        address to_,
        uint256 fromTokenId_,
        uint256 toTokenId_,
        uint256 slot_,
        uint256 value_
    ) internal virtual {}

    function _afterValueTransfer(
        address from_,
        address to_,
        uint256 fromTokenId_,
        uint256 toTokenId_,
        uint256 slot_,
        uint256 value_
    ) internal virtual {}

    /* solhint-enable */

    function _setMetadataDescriptor(
        address metadataDescriptor_
    ) internal virtual {
        metadataDescriptor = IERC3525MetadataDescriptor(metadataDescriptor_);
        emit SetMetadataDescriptor(metadataDescriptor_);
    }

    function _createOriginalTokenId() internal virtual returns (uint256) {
        return _createDefaultTokenId();
    }

    function _createDerivedTokenId(
        uint256 fromTokenId_
    ) internal virtual returns (uint256) {
        fromTokenId_;
        return _createDefaultTokenId();
    }

    function _createDefaultTokenId() private view returns (uint256) {
        return ERC3525.totalSupply() + 1;
    }
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract ABI

[{"inputs":[{"internalType":"contract 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w","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_memberId","type":"uint256"}],"name":"cancelMembership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_type","type":"uint256"},{"internalType":"uint256[]","name":"_values","type":"uint256[]"}],"name":"config","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId_","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner_","type":"address"},{"internalType":"address","name":"operator_","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"management","outputs":[{"internalType":"contract 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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000002f295e191147d406bc7c1b732243ff5d437ce71600000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000001200000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000000f4d656d626572736869702054657374000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000044142434400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001368747470733a2f2f6578616d706c652e636f6d00000000000000000000000000

-----Decoded View---------------
Arg [0] : _management (address): 0x2f295e191147d406bc7c1b732243ff5d437ce716
Arg [1] : name (string): Membership Test
Arg [2] : symbol (string): ABCD
Arg [3] : baseURI_ (string): https://example.com
Arg [4] : decimals_ (uint8): 18

-----Encoded View---------------
11 Constructor Arguments found :
Arg [0] : 0000000000000000000000002f295e191147d406bc7c1b732243ff5d437ce716
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [5] : 000000000000000000000000000000000000000000000000000000000000000f
Arg [6] : 4d656d6265727368697020546573740000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [8] : 4142434400000000000000000000000000000000000000000000000000000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000013
Arg [10] : 68747470733a2f2f6578616d706c652e636f6d00000000000000000000000000


Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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