MATIC Price: $0.72 (-1.16%)
Gas: 244 GWei
 

Overview

Max Total Supply

414 MM

Holders

397

Total Transfers

-

Market

Onchain Market Cap

$0.00

Circulating Supply Market Cap

-

Other Info

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xf048248D...2ccE67351
The constructor portion of the code might be different and could alter the actual behaviour of the contract

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

[{"inputs":[{"internalType":"uint256","name":"_collection_id","type":"uint256"},{"internalType":"address","name":"_owner","type":"address"},{"internalType":"string","name":"_name_collection","type":"string"},{"internalType":"string","name":"_symbol_collection","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"MAX_SUPPLY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_nft_id","type":"uint256"}],"name":"burn","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_nft_id","type":"uint256"},{"internalType":"address","name":"_affiliation","type":"address"}],"name":"buy_token","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"nft_id","type":"uint256"},{"internalType":"uint256","name":"salePrice","type":"uint256"},{"internalType":"uint16","name":"type_split","type":"uint16"},{"internalType":"address","name":"affiliation","type":"address"}],"internalType":"struct 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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