MATIC Price: $0.73 (-0.19%)
Gas: 135 GWei
 

Overview

Max Total Supply

1,550 CRF-CMI

Holders

1,379

Total Transfers

-

Market

Onchain Market Cap

$0.00

Circulating Supply Market Cap

-

Other Info

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Contract Source Code Verified (Exact Match)

Contract Name:
collection_contract

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2023-09-07
*/

// SPDX-License-Identifier: MIT AND UNLICENSED

// File @openzeppelin/contracts/utils/[email protected]

// Original license: 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 @openzeppelin/contracts/access/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


// File @openzeppelin/contracts/utils/introspection/[email protected]

// Original license: 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 @openzeppelin/contracts/interfaces/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 * _Available since v4.5._
 */
interface IERC2981 is IERC165 {
    /**
     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
     */
    function royaltyInfo(
        uint256 tokenId,
        uint256 salePrice
    ) external view returns (address receiver, uint256 royaltyAmount);
}


// File @openzeppelin/contracts/token/ERC721/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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/[email protected]

// Original license: SPDX_License_Identifier: MIT
// 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/[email protected]

// Original license: 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 @openzeppelin/contracts/utils/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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/utils/introspection/[email protected]

// Original license: SPDX_License_Identifier: MIT
// 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/utils/math/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 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 256, 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 << 3) < value ? 1 : 0);
        }
    }
}


// File @openzeppelin/contracts/utils/math/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}


// File @openzeppelin/contracts/utils/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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 `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @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);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}


// File @openzeppelin/contracts/token/ERC721/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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 {}

    /**
     * @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 {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }
}


// File @openzeppelin/contracts/utils/cryptography/[email protected]

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Calldata version of {verify}
     *
     * _Available since v4.7._
     */
    function verifyCalldata(bytes32[] calldata proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Calldata version of {processProof}
     *
     * _Available since v4.7._
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
     * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
     * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
     * respectively.
     *
     * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
     * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
     * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
     *
     * _Available since v4.7._
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Calldata version of {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}


// File contracts/certhis_struct.sol

// Original license: SPDX_License_Identifier: UNLICENSED

pragma solidity ^0.8.0;

interface certhis_struct {
    struct CERTHIS_DEFAULT {
        address default_certhis_payout; //payout address for certhis royalties (resale)
        address default_certhis_payout_mint; //payout address for certhis royalties (mint)
        bool freeze_label_creation; // freeze collection creation (emergency)
        bool freeze_collection_creation; // freeze label creation (emergency)
    }

    struct NFT {
        uint256 nft_id; //nft id
        uint256 collection_id; // collection id
        address owner_address; // owner of the nft
        address creator_address; // creator of the nft (minter)
        string token_uri; // token uri of the nft
        uint16 sellable_type; //0 not for sell - 1 : erc20 sell - 2 : Eth sell
        address sellable_currency; // currency for sell
        uint256 sellable_amount; // price if sell
        bool minted; // if the nft is minted (Bulk collection)
        uint16 royalties; // royalties for the creator (minter)
        address affiliation; // affiliate of the nft
    }

    struct Collection {
        uint256 label_id; // label id
        uint256 collection_id; // collection id
        address collection_address; // collection smart contract address
        address creator_address; // creator address
        string collection_uri; // url of nft folder
        bool collection_type; //private= true , public = false
        uint16 collection_tax; // royalties collection resale
        address collection_payout; // address payout for resale
        uint16 mintable_activate; // type mint (0 => free ; 1 => erc20 ; 2=> eth )
        address currency_for_mint; // if mintable_activate mint == 1 currency for mint
        uint256 price_for_mint; // price for mint
        address collection_payout_mint; // collection payout address for mint
        bytes32 root_price; // hash of nft price (bulk collection)
        uint16 collection_full; // 0 = Simple ; 1 = Standard ; 2 = Bulk ;
        bytes32 root; // hash of whitelisted address that can mint
        uint256 mint_start; // start of mint if equal 0 no time specify
        uint256 mint_end; // end of mint if equal 0 no time specify
        uint256 sell_id; // sales id (for the mint can resent max mint per wallet)
        uint256 max_mint; // max mint per_wallet
        uint256 max_mint_sell; // max mint for the sell (nft if maximum)
        uint256 max_supply; // max supply
        uint16 affiliation; //affiliation comission (same for mint and resale)
        uint16 share_royalties; // share royalties
        address tax_descativate; // desactivate royalties of sale for specific currency erc20 (just collection royalties)
        uint16 collection_certhis_tax; // royalties for certhis on resale
        uint16 collection_certhis_tax_mint; // royalties for certhis on the mint
        address check_contract; //check from outside contract if msg send is approve
        bool sbt_contract ; //all token emit by this collection are sbt or not
        bool burnable; // if the nft can be burn by an owner of an nft
    }

    struct Label {
        uint256 label_id; // label id
        uint16 label_tax; // label royalties for the resale
        address label_payout; // label payout address for resale
        uint16 label_tax_mint; // label royalties for mint
        address label_payout_mint; // label payout address for mint
        address creator_address; // creator of the label
    }

    struct mint_proof {
        uint256 price_for_mint; // price of the nft
        address currency_for_mint; //0x = eth else erc20
        bytes32[] proof_price; // proof for price
        bytes32[] proof_mint; // proof for mint
    }

    struct payment_split_infos {
        uint256 nft_id;
        uint256 salePrice;
        uint16 type_split;
        address affiliation;
    }

    struct payment_send {
        uint256 amount_to_send; // amount to send
        address address_payout; // address to send
    }
}


// File contracts/Icerthis_check.sol

// Original license: SPDX_License_Identifier: UNLICENSED

pragma solidity ^0.8.0;

interface Icerthis_check {
    //check validity
    function check(address _address,address _address2) external view returns (bool);
}


// File contracts/Icerthis_erc20.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}


// File contracts/Icerthis_main.sol

// Original license: SPDX_License_Identifier: UNLICENSED

pragma solidity ^0.8.0;

interface Icerthis_main {
    //get label
    function get_label(uint256 _label_id)
        external
        view
        returns (certhis_struct.Label memory);

    //get collection
    function get_collection(uint256 _collection_id)
        external
        view
        returns (certhis_struct.Collection memory);

    //get default_certhis_value
    function certhis_default()
        external
        view
        returns (certhis_struct.CERTHIS_DEFAULT memory);
}


// File contracts/certhis_collection.sol

// Original license: SPDX_License_Identifier: UNLICENSED

pragma solidity ^0.8.0;







contract collection_contract is ERC721, Ownable {
    certhis_struct.Collection collection_object;

    bool collection_init = false;

    bool freeze_mint = false; //  if mint is frozen

    bool freeze_buy = false; // if buy is frozen

    bool sbt = false; // if all token emit by this collection are sbt

    bool burnable = false; // if the nft can be burn by an owner of an nft

    uint16 collection_certhis_tax; // certhis royalties on resale

    uint16 collection_certhis_tax_mint; // certhis royalties on mint

    uint256 public index_nft; // current nft id

    uint256 public collection_id; // collection id

    uint256 public totalSupply; // collection type

    address certhis_contract; // certhis smart contract address

    //nft
    mapping(uint256 => certhis_struct.NFT) _nfts; // array of nfts object

    mapping(uint256 => mapping(address => uint256)) _max_mint; // max mint per waller by sell id



    /* 
      deploying certhis collection smart contract
      uint256 _collection_id  : collection id 
      address _owner : owner of the collection
      string memory _name_collection : name of the collection
      string  memory _symbol_collection : symbol of the collection
      uint256 _max_supply : max suply of the collection
    */
    constructor(
        uint256 _collection_id,
        address _owner,
        string memory _name_collection,
        string memory _symbol_collection
    ) ERC721(_name_collection, _symbol_collection) {
        certhis_contract = msg.sender;

        //atrribute collection id
        collection_id = _collection_id;

        //transfer ownership to the creator of the collection
        _transferOwnership(_owner);
    }

    //public function MAX_SUPPLY
    function MAX_SUPPLY() public view returns (uint256) {
        //check if collection is type 0
        if (collection_object.collection_full == 0) {
            return index_nft;
        } else {
            return collection_object.max_supply;
        }
    }

    function update_collection_object(
        certhis_struct.Collection memory _collection_object
    ) external {
        require(msg.sender == certhis_contract);

        //set information that can be change after
        if (collection_init == false) {
            //certhis tax can be changed by certhis contract factory
            collection_certhis_tax = _collection_object.collection_certhis_tax;
            collection_certhis_tax_mint = _collection_object
                .collection_certhis_tax;

            //sbt can be changed by certhis contract factory
            sbt = _collection_object.sbt_contract;

            //burnable can be changed by certhis contract factory
            burnable = _collection_object.burnable;

            collection_init = true;
        }

        collection_object = _collection_object;
    }

    // free mint and/or resale
    function freeze(bool _freez_mint, bool _freez_buy)
        external
        onlyOwner
        returns (bool)
    {
        freeze_mint = _freez_mint;
        freeze_buy = _freez_buy;
        return true;
    }

    // EIP-2981 royalties (return just certhis royalties information if certhis royalties > 0 else return collection royalties information)
    function royaltyInfo(uint256 _tokenId, uint256 _salePrice)
        external
        view
        returns (address, uint256)
    {
        certhis_struct.CERTHIS_DEFAULT memory certhis_default = Icerthis_main(
            certhis_contract
        ).certhis_default();

        address _receiver = certhis_default.default_certhis_payout;
        // check if certhis tax desactivate put collection tax
        uint256 return_royalties = collection_certhis_tax;
        if (collection_certhis_tax == 0) {
            return_royalties = collection_object.collection_tax;
            _receiver = collection_object.collection_payout;
        }

        return (
            _receiver,
            (_salePrice * return_royalties) / 10000 + (_tokenId * 0)
        );
    }

    /*
        Resale function 
        address _to : address who receive the nft
        uint256 _nft_id : nft id of the purchase
        address _affiliation : affiliate of the purchase
     */
    function buy_token(
        address _to,
        uint256 _nft_id,
        address _affiliation
    ) external payable returns (bool) {
        require(
            _nfts[_nft_id].nft_id == _nft_id &&
                _nfts[_nft_id].sellable_amount > 0 &&
                _nfts[_nft_id].owner_address != _to &&
                (_nfts[_nft_id].sellable_type == 1 ||
                    _nfts[_nft_id].sellable_type == 2) &&
                freeze_buy == false
        );

        bool success = false;
        if (_nfts[_nft_id].sellable_type != 2) {
            success = IERC20(_nfts[_nft_id].sellable_currency).transferFrom(
                msg.sender,
                address(this),
                _nfts[_nft_id].sellable_amount
            );
        }

        require(
            (success == true ||
                (msg.value >= _nfts[_nft_id].sellable_amount &&
                    _nfts[_nft_id].sellable_type == 2))
        );

        send_payouts(
            calculate_payouts(
                certhis_struct.payment_split_infos({
                    nft_id: _nft_id,
                    type_split: 1,
                    affiliation: _affiliation,
                    salePrice: _nfts[_nft_id].sellable_amount
                })
            ),
            _nfts[_nft_id].sellable_type,
            _nfts[_nft_id].sellable_currency
        );

        //transfer token to the buyer
        _transfer(_nfts[_nft_id].owner_address, _to, _nft_id);
        return true;
    }

    // get nft struct by nft id
    function get_nft(uint256 _nft_id)
        public
        view
        returns (certhis_struct.NFT memory)
    {
        require(
            _nft_id < index_nft ||
                ((collection_object.collection_full == 2 &&
                    _nft_id < collection_object.max_supply) ||
                    _nfts[_nft_id].minted == true)
        );

        certhis_struct.NFT memory nft_object = _nfts[_nft_id];

        nft_object.collection_id = collection_id;

        // detect if collection is not simple
        if (collection_object.collection_full > 0) {
            nft_object.token_uri = string(
                abi.encodePacked(
                    collection_object.collection_uri,
                    "/",
                    Strings.toString(_nft_id),
                    ".json"
                )
            );
            if (!_exists(_nft_id)) {
                nft_object.minted = false;
                nft_object.nft_id = _nft_id;
            }
        }

        return nft_object;
    }

    //standar token uri function
    function tokenURI(uint256 _nft_id)
        public
        view
        virtual
        override
        returns (string memory)
    {
        return get_nft(_nft_id).token_uri;
    }

    // current nft minted by address (based on current sell id)
    function current_minted(address _address) external view returns (uint256) {
        return _max_mint[collection_object.sell_id][_address];
    }

    /*
        
        Mint Nft function
        
        address _to : address who will receive the nft
        certhis_struct.NFT memory _nft : nft information
        certhis_struct.mint_proof memory _mint_proof : proof information
        
        */
    function safeMint(
        address _to,
        certhis_struct.NFT memory _nft,
        certhis_struct.mint_proof memory _mint_proof
    ) public payable returns (uint256) {
        certhis_struct.Collection storage collection_storage = collection_object;

        //limit royalties to 25% per nft
        require(_nft.royalties <= 2500 && freeze_mint == false);

        //if collection is bulk detect if nft not minted
        if (collection_storage.collection_full == 2) {
            require(!_exists(_nft.nft_id));
        }

        if (collection_storage.check_contract != address(0)) {
            require(
                Icerthis_check(collection_storage.check_contract).check(msg.sender,_to) ==
                    true
            );
        }

        //if collection is Standard valid parameter (max mint / max mint for all / mint start / mint end)
        if (
            collection_storage.collection_full == 1 ||
            collection_storage.collection_full == 2
        ) {
            uint256 sell_id_p_1 = _max_mint[collection_storage.sell_id][_to] + 1;
            bool return_error = false;
            if (
                (collection_storage.max_mint_sell != 0 &&
                    collection_storage.max_mint_sell < index_nft) ||
                (collection_storage.mint_start != 0 &&
                    collection_storage.mint_start > block.timestamp) ||
                (collection_storage.mint_end != 0 &&
                    collection_storage.mint_end < block.timestamp) ||
                collection_storage.max_supply <= index_nft ||
                (sell_id_p_1 > collection_storage.max_mint &&
                    collection_storage.max_mint != 0)
            ) {
                return_error = true;
            }

            require(return_error == false);

            _max_mint[collection_storage.sell_id][_to] =
                _max_mint[collection_storage.sell_id][_to] +
                1;
        }

        //if collection is private
        if (collection_storage.collection_type == true) {
            bytes32 leaf = keccak256(abi.encodePacked(msg.sender));
            require(
                MerkleProof.verify(
                    _mint_proof.proof_mint,
                    collection_storage.root,
                    leaf
                )
            );
        }
        address currency_for_mint = collection_storage.currency_for_mint;
        uint256 price_for_mint = collection_storage.price_for_mint;
        uint16 mintable_activate = collection_storage.mintable_activate;
        //for bulk collection check if valid price
        if (collection_storage.collection_full == 2) {
            bytes32 leaf = keccak256(
                abi.encodePacked(
                    _nft.nft_id,
                    _mint_proof.currency_for_mint,
                    _mint_proof.price_for_mint
                )
            );
            require(
                MerkleProof.verify(
                    _mint_proof.proof_price,
                    collection_storage.root_price,
                    leaf
                )
            );

            currency_for_mint = _mint_proof.currency_for_mint;
            price_for_mint = _mint_proof.price_for_mint;

            if (address(_mint_proof.currency_for_mint) == address(0)) {
                mintable_activate = 2;
            } else {
                mintable_activate = 1;
            }
        }
        //detect if is not free mint
        if (price_for_mint > 0) {

            bool success = false;
            // if erc 20 mint
            if (mintable_activate == 1) {
                success = IERC20(currency_for_mint)
                    .transferFrom(msg.sender, address(this), price_for_mint);
            }

            require(
                success ||
                    (msg.value >= price_for_mint &&
                        mintable_activate != 1)
            );

            // send paiement
            send_payouts(
                calculate_payouts(
                    certhis_struct.payment_split_infos({
                        nft_id: 0,
                        type_split: 2,
                        affiliation: _nft.affiliation,
                        salePrice: price_for_mint
                    })
                ),
                mintable_activate,
                currency_for_mint
            );
        }

        uint256 new_nft_id;
        if (collection_storage.collection_full == 2) {
            new_nft_id = _nft.nft_id;
        } else {
            new_nft_id = index_nft;
        }

        _nfts[new_nft_id] = _nft;
        _nfts[new_nft_id].collection_id = collection_storage.collection_id;
        _nfts[new_nft_id].owner_address = _to;
        _nfts[new_nft_id].creator_address = msg.sender;
        _nfts[new_nft_id].minted = true;

        if (collection_storage.collection_full == 0) {
            _nfts[new_nft_id].royalties = _nft.royalties;
            _nfts[new_nft_id].token_uri = _nft.token_uri;
        } else if (collection_storage.share_royalties > 0) {
            _nfts[new_nft_id].royalties = collection_storage.share_royalties;
        }

        _safeMint(_to, new_nft_id);
        _nfts[new_nft_id].nft_id = new_nft_id;

        index_nft = index_nft + 1;
        totalSupply = totalSupply + 1;
        return new_nft_id;
    }

    /*
        loop of safeMint Function
    */

    function mint_p1(
        uint16 nb_mint,
        address _to,
        certhis_struct.NFT memory _nft,
        certhis_struct.mint_proof memory _mint_proof
    ) external payable returns (bool) {
        for (uint256 i = 1; i <= nb_mint; i++) {
            safeMint(_to, _nft, _mint_proof);
        }
        return true;
    }

    //edit nft price
    function edit_nft(
        uint256 _nft_id,
        uint16 _sellable_type,
        address _sellable_currency,
        uint256 _sellable_amount
    ) external returns (bool) {
        require(_nfts[_nft_id].owner_address == msg.sender);
        _nfts[_nft_id].sellable_type = _sellable_type;
        _nfts[_nft_id].sellable_currency = _sellable_currency;
        _nfts[_nft_id].sellable_amount = _sellable_amount;
        return true;
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 _token_id,
        uint256 batchSize
    ) internal override(ERC721) {
        _nfts[_token_id].owner_address = to;
        //reset price of nft when the nft is transfered
        if (from != address(0)) {
            _nfts[_token_id].sellable_type = 0;
            _nfts[_token_id].sellable_currency = address(0);
            _nfts[_token_id].sellable_amount = 0;
        }

        //detect if the collection emit just sbt token
        require(from == address(0) || sbt == false);

        super._beforeTokenTransfer(from, to, _token_id, batchSize);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721)
        returns (bool)
    {
        return
            interfaceId == type(IERC2981).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    //calculation paiment splitting
    function calculate_payouts(
        certhis_struct.payment_split_infos memory payment_split_infos
    ) public view returns (certhis_struct.payment_send[] memory) {
        certhis_struct.CERTHIS_DEFAULT memory certhis_default = Icerthis_main(
            certhis_contract
        ).certhis_default();

        certhis_struct.Label memory label_object = Icerthis_main(
            certhis_contract
        ).get_label(collection_object.label_id);

        uint16 certhis_tax = collection_certhis_tax;

        uint16 label_tax = label_object.label_tax;
        if (owner() != label_object.creator_address) {
            label_tax = 0;
        }

        uint16 type_split = payment_split_infos.type_split;

        //0 certhis
        //1 affiliation nft
        //2 label
        //3 nft creator
        //4 nft owner
        //5 collection
        certhis_struct.payment_send[]
            memory members_payout = new certhis_struct.payment_send[](6);

        members_payout[2].address_payout = label_object.label_payout;
        members_payout[0].address_payout = certhis_default
            .default_certhis_payout;
        if (type_split == 2) {
            certhis_tax = collection_certhis_tax_mint;

            label_tax = label_object.label_tax_mint;
            if (owner() != label_object.creator_address) {
                label_tax = 0;
            }
            members_payout[2].address_payout = label_object.label_payout_mint;
            members_payout[0].address_payout = certhis_default
                .default_certhis_payout_mint;
        }

        uint256 salePrice = payment_split_infos.salePrice;
        uint256 rest = salePrice;
        uint256 for_certhis = (salePrice * certhis_tax) / 10000;
        rest = rest - for_certhis;
        members_payout[0].amount_to_send = for_certhis;

        if (
            collection_object.affiliation > 0 &&
            payment_split_infos.affiliation != address(0)
        ) {
            members_payout[1].amount_to_send =
                (salePrice * collection_object.affiliation) /
                10000;

            members_payout[1].address_payout = payment_split_infos.affiliation;

            rest = rest - members_payout[1].amount_to_send;
        }

        //label royalties
        if (label_tax > 0) {
            members_payout[2].amount_to_send = (salePrice * label_tax) / 10000;

            rest = rest - members_payout[2].amount_to_send;
        }

        //collection royalties buy
        uint256 for_collection;

        if (type_split != 2) {
            uint256 nft_id = payment_split_infos.nft_id;
            certhis_struct.NFT memory nft_object = _nfts[nft_id];

            bool _disabled_tax_collection = false;

            if (
                type_split != 3 &&
                nft_object.sellable_type == 1 &&
                collection_object.tax_descativate ==
                nft_object.sellable_currency
            ) {
                _disabled_tax_collection = true;
            }

            if (
                collection_object.collection_tax > 0 &&
                _disabled_tax_collection == false
            ) {
                for_collection =
                    (salePrice * collection_object.collection_tax) /
                    10000;
                rest = rest - for_collection;
            }

            if (nft_object.royalties > 0) {
                members_payout[3].amount_to_send =
                    (salePrice * nft_object.royalties) /
                    10000;
                rest = rest - members_payout[3].amount_to_send;

                members_payout[3].address_payout = nft_object.creator_address;
            }

            if (type_split != 3) {
                members_payout[4].amount_to_send = rest;
                members_payout[4].address_payout = nft_object.owner_address;
            }
            members_payout[5].address_payout = collection_object
                .collection_payout;
        } else {
            members_payout[5].address_payout = collection_object
                .collection_payout_mint;
            for_collection = rest;
        }

        members_payout[5].amount_to_send = for_collection;

        return members_payout;
    }

    //send paiments
    function send_payouts(
        certhis_struct.payment_send[] memory _members,
        uint16 _type_sending,
        address _currency
    ) internal returns (bool) {
        for (uint256 i = 0; i <= 5; i++) {
            if (_members[i].amount_to_send > 0) {
                if (_type_sending == 1) {
                    require(
                        IERC20(_currency).transfer(
                            _members[i].address_payout,
                            _members[i].amount_to_send
                        )
                    );
                } else if (_type_sending == 2) {
                    payable(_members[i].address_payout).transfer(
                        _members[i].amount_to_send
                    );
                }
            }
        }

        return true;
    }

    //burnable funtion
    function burn(uint256 _nft_id) external returns (bool) {
        require(
            (_nfts[_nft_id].owner_address == msg.sender ||
                getApproved(_nft_id) == msg.sender) && burnable == true
        );
        _burn(_nft_id);
        totalSupply = totalSupply - 1;
        delete _nfts[_nft_id];
        return true;
    }
}

Contract Security Audit

Contract ABI

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certhis_struct.payment_split_infos","name":"payment_split_infos","type":"tuple"}],"name":"calculate_payouts","outputs":[{"components":[{"internalType":"uint256","name":"amount_to_send","type":"uint256"},{"internalType":"address","name":"address_payout","type":"address"}],"internalType":"struct certhis_struct.payment_send[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"collection_id","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"current_minted","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_nft_id","type":"uint256"},{"internalType":"uint16","name":"_sellable_type","type":"uint16"},{"internalType":"address","name":"_sellable_currency","type":"address"},{"internalType":"uint256","name":"_sellable_amount","type":"uint256"}],"name":"edit_nft","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_freez_mint","type":"bool"},{"internalType":"bool","name":"_freez_buy","type":"bool"}],"name":"freeze","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_nft_id","type":"uint256"}],"name":"get_nft","outputs":[{"components":[{"internalType":"uint256","name":"nft_id","type":"uint256"},{"internalType":"uint256","name":"collection_id","type":"uint256"},{"internalType":"address","name":"owner_address","type":"address"},{"internalType":"address","name":"creator_address","type":"address"},{"internalType":"string","name":"token_uri","type":"string"},{"internalType":"uint16","name":"sellable_type","type":"uint16"},{"internalType":"address","name":"sellable_currency","type":"address"},{"internalType":"uint256","name":"sellable_amount","type":"uint256"},{"internalType":"bool","name":"minted","type":"bool"},{"internalType":"uint16","name":"royalties","type":"uint16"},{"internalType":"address","name":"affiliation","type":"address"}],"internalType":"struct certhis_struct.NFT","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"index_nft","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":[{"internalType":"uint16","name":"nb_mint","type":"uint16"},{"internalType":"address","name":"_to","type":"address"},{"components":[{"internalType":"uint256","name":"nft_id","type":"uint256"},{"internalType":"uint256","name":"collection_id","type":"uint256"},{"internalType":"address","name":"owner_address","type":"address"},{"internalType":"address","name":"creator_address","type":"address"},{"internalType":"string","name":"token_uri","type":"string"},{"internalType":"uint16","name":"sellable_type","type":"uint16"},{"internalType":"address","name":"sellable_currency","type":"address"},{"internalType":"uint256","name":"sellable_amount","type":"uint256"},{"internalType":"bool","name":"minted","type":"bool"},{"internalType":"uint16","name":"royalties","type":"uint16"},{"internalType":"address","name":"affiliation","type":"address"}],"internalType":"struct certhis_struct.NFT","name":"_nft","type":"tuple"},{"components":[{"internalType":"uint256","name":"price_for_mint","type":"uint256"},{"internalType":"address","name":"currency_for_mint","type":"address"},{"internalType":"bytes32[]","name":"proof_price","type":"bytes32[]"},{"internalType":"bytes32[]","name":"proof_mint","type":"bytes32[]"}],"internalType":"struct certhis_struct.mint_proof","name":"_mint_proof","type":"tuple"}],"name":"mint_p1","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint256","name":"_salePrice","type":"uint256"}],"name":"royaltyInfo","outputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"components":[{"internalType":"uint256","name":"nft_id","type":"uint256"},{"internalType":"uint256","name":"collection_id","type":"uint256"},{"internalType":"address","name":"owner_address","type":"address"},{"internalType":"address","name":"creator_address","type":"address"},{"internalType":"string","name":"token_uri","type":"string"},{"internalType":"uint16","name":"sellable_type","type":"uint16"},{"internalType":"address","name":"sellable_currency","type":"address"},{"internalType":"uint256","name":"sellable_amount","type":"uint256"},{"internalType":"bool","name":"minted","type":"bool"},{"internalType":"uint16","name":"royalties","type":"uint16"},{"internalType":"address","name":"affiliation","type":"address"}],"internalType":"struct certhis_struct.NFT","name":"_nft","type":"tuple"},{"components":[{"internalType":"uint256","name":"price_for_mint","type":"uint256"},{"internalType":"address","name":"currency_for_mint","type":"address"},{"internalType":"bytes32[]","name":"proof_price","type":"bytes32[]"},{"internalType":"bytes32[]","name":"proof_mint","type":"bytes32[]"}],"internalType":"struct certhis_struct.mint_proof","name":"_mint_proof","type":"tuple"}],"name":"safeMint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_nft_id","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"label_id","type":"uint256"},{"internalType":"uint256","name":"collection_id","type":"uint256"},{"internalType":"address","name":"collection_address","type":"address"},{"internalType":"address","name":"creator_address","type":"address"},{"internalType":"string","name":"collection_uri","type":"string"},{"internalType":"bool","name":"collection_type","type":"bool"},{"internalType":"uint16","name":"collection_tax","type":"uint16"},{"internalType":"address","name":"collection_payout","type":"address"},{"internalType":"uint16","name":"mintable_activate","type":"uint16"},{"internalType":"address","name":"currency_for_mint","type":"address"},{"internalType":"uint256","name":"price_for_mint","type":"uint256"},{"internalType":"address","name":"collection_payout_mint","type":"address"},{"internalType":"bytes32","name":"root_price","type":"bytes32"},{"internalType":"uint16","name":"collection_full","type":"uint16"},{"internalType":"bytes32","name":"root","type":"bytes32"},{"internalType":"uint256","name":"mint_start","type":"uint256"},{"internalType":"uint256","name":"mint_end","type":"uint256"},{"internalType":"uint256","name":"sell_id","type":"uint256"},{"internalType":"uint256","name":"max_mint","type":"uint256"},{"internalType":"uint256","name":"max_mint_sell","type":"uint256"},{"internalType":"uint256","name":"max_supply","type":"uint256"},{"internalType":"uint16","name":"affiliation","type":"uint16"},{"internalType":"uint16","name":"share_royalties","type":"uint16"},{"internalType":"address","name":"tax_descativate","type":"address"},{"internalType":"uint16","name":"collection_certhis_tax","type":"uint16"},{"internalType":"uint16","name":"collection_certhis_tax_mint","type":"uint16"},{"internalType":"address","name":"check_contract","type":"address"},{"internalType":"bool","name":"sbt_contract","type":"bool"},{"internalType":"bool","name":"burnable","type":"bool"}],"internalType":"struct certhis_struct.Collection","name":"_collection_object","type":"tuple"}],"name":"update_collection_object","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _collection_id (uint256): 4
Arg [1] : _owner (address): 0x2c3478B8A1761dF511Bd6017e27397aa460275f9
Arg [2] : _name_collection (string): Le Petit Marseillais x NFBEEs Coast Mission
Arg [3] : _symbol_collection (string): CRF-CMI

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [1] : 0000000000000000000000002c3478b8a1761df511bd6017e27397aa460275f9
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [4] : 000000000000000000000000000000000000000000000000000000000000002b
Arg [5] : 4c65205065746974204d61727365696c6c6169732078204e464245457320436f
Arg [6] : 617374204d697373696f6e000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [8] : 4352462d434d4900000000000000000000000000000000000000000000000000


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