ETH Price: $3,387.56 (-1.57%)
Gas: 2 Gwei

Token

Pulse (PULSE)
 

Overview

Max Total Supply

4 PULSE

Holders

1

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A
Balance
4 PULSE
0xfa2238eeb4e2e5612853bf29f925a36f971f9010
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Minimal Proxy Contract for 0xa7904c92703375eacedbf81c223f9ec3b2a534ba

Contract Name:
ERC721Sovreign

Compiler Version
v0.8.19+commit.7dd6d404

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 11 : ERC721Sovreign.sol
/*----------------------------------------------------------*|
|*          ███    ██ ██ ███    ██ ███████  █████           *|
|*          ████   ██ ██ ████   ██ ██      ██   ██          *|
|*          ██ ██  ██ ██ ██ ██  ██ █████   ███████          *|
|*          ██  ██ ██ ██ ██  ██ ██ ██      ██   ██          *|
|*          ██   ████ ██ ██   ████ ██      ██   ██          *|
|*----------------------------------------------------------*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import "../extensions/ERC721Enumerable.sol";
import "../extensions/ERC721URIStorage.sol";
import "../extensions/ERC721Burnable.sol";
import "../../common/ERC2981NSovreign.sol";
import "../../../access/AccessControl.sol";

/*************************************************************
 * @title ERC721Sovreign                                     *
 *                                                           *
 * @notice Self-sovreign ERC-721 minter preset               *
 *                                                           *
 * @dev {ERC721} token                                       *
 *                                                           *
 * @custom:security-contact [email protected]                    *
 ************************************************************/

contract ERC721Sovreign is
    ERC721Enumerable,
    ERC721Burnable,
    ERC721URIStorage,
    ERC2981NSovreign,
    AccessControl
{
    /*----------------------------------------------------------*|
    |*  # ACCESS CONTROL                                        *|
    |*----------------------------------------------------------*/

    /**
     * @dev `MINTER_ROLE` is needed in case the deployer may want to use or allow other accounts to mint on their self-sovreign collection
     */
    bytes32 private constant MINTER_ROLE =
        0x9f2df0fed2c77648de5860a4cc508cd0818c85b8b8a1ab4ceeef8d981c8956a6; // keccak256("MINTER_ROLE");
    /**
     * @dev constant set at deployment of master contract, replaces `initializer` modifier reducing the cost of calling `initialize` from the factory contract when a new clone is deployed.
     */
    address private immutable _FACTORY;

    /*----------------------------------------------------------*|
    |*  # MINTING                                               *|
    |*----------------------------------------------------------*/

    /**
     * @dev Implements interface function {IERC721-mint}. Creates a new token for `msg.sender`. Its token ID will be automatically
     * assigned (and available on the emitted {IERC721-Transfer} event), and the token
     * URI autogenerated based on the base URI passed at construction.
     * @param _tokenURI Replaces deprecated Openzeppelin contracts v4.0 `ERC721URIStorage` extension
     *      See https://forum.openzeppelin.com/t/why-doesnt-openzeppelin-erc721-contain-settokenuri/6373 and https://forum.openzeppelin.com/t/function-settokenuri-in-erc721-is-gone-with-pragma-0-8-0/5978/2
     * @dev when minted for the first time, royalty recipient MUST be set to msg.sender, i.e. minter/artist;
     *      royalty receipient cannot and SHOULD not be set to an address different than the minter's such as a payment splitter or else `setRoyaltyRecipient` function will revert when called (unless receiver )
     */
    function mint(
        bytes32 _tokenURI,
        uint24 royaltyBps_,
        uint24[] calldata recipientsBps_,
        address[] calldata royaltyRecipients_
    ) public onlyRole(MINTER_ROLE) {
        /*----------------------------------------------------------*|
        |*  # MINT                                                  *|
        |*----------------------------------------------------------*/

        uint256 tokenId = _owners.length;
        _mint(msg.sender, tokenId);

        /*----------------------------------------------------------*|
        |*  # URI STORAGE                                           *|
        |*----------------------------------------------------------*/

        _setTokenURI(tokenId, _tokenURI);
        setRoyaltyInfo(
            tokenId,
            royaltyBps_,
            recipientsBps_,
            royaltyRecipients_
        );
    }

    /**
     * @dev Implements interface function {IERC721-mint}. Creates a new token for `msg.sender`. Its token ID will be automatically
     *      assigned (and available on the emitted {IERC721-Transfer} event), and the token
     *      URI autogenerated based on the base URI passed at construction.
     * @dev it is assumed that the caller is the minter and thus the owner of the token,
     *      therefore instead of calling the internal _transfer function, the tansfer logic has been reimplemented in this function
     *      in order to avoid unnecessary `require` statements.
     * @dev when minted for the first time, royalty recipient MUST be set to msg.sender, i.e. minter/artist;
     *      royalty receipient MUST not be set to an address different than the minter's such as a payment splitter or else this function will revert
     */
    function mintAndTransfer(
        address _to,
        bytes32 _tokenURI,
        uint24 royaltyBps_,
        uint24[] calldata recipientsBps_,
        address[] calldata royaltyRecipients_,
        bytes calldata _data
    ) external onlyRole(MINTER_ROLE) {
        /*----------------------------------------------------------*|
        |*  # MINT                                                  *|
        |*----------------------------------------------------------*/

        uint256 tokenId = _owners.length;
        _mintAndTransfer(msg.sender, _to, tokenId, _data);

        /*----------------------------------------------------------*|
        |*  # URI STORAGE                                           *|
        |*----------------------------------------------------------*/

        _setTokenURI(tokenId, _tokenURI);
        setRoyaltyInfo(
            tokenId,
            royaltyBps_,
            recipientsBps_,
            royaltyRecipients_
        );
    }

    /*----------------------------------------------------------*|
    |*  # ROYALTY INFO SETTER                                   *|
    |*----------------------------------------------------------*/

    function setRoyaltyInfo(
        uint256 tokenId_,
        uint24 royaltyBps_,
        uint24[] calldata recipientsBps_,
        address[] calldata royaltyRecipients_
    ) public onlyRole(MINTER_ROLE) {
        _setRoyalties(
            tokenId_,
            royaltyBps_,
            recipientsBps_,
            royaltyRecipients_
        );
    }

    /*----------------------------------------------------------*|
    |*  # URI STORAGE                                           *|
    |*----------------------------------------------------------*/

    function setBaseURI(string calldata baseURI_) external {
        require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender));
        _setBaseURI(baseURI_);
    }

    /*----------------------------------------------------------*|
    |*  # OVERRIDES                                             *|
    |*----------------------------------------------------------*/

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

    /*----------------------------------------------------------*|
    |*  # VIEW FUNCTIONS                                        *|
    |*----------------------------------------------------------*/

    /**
     * @dev same function interface as erc1155, so that external contracts, i.e. the marketplace, can check either erc without requiring an if/else statement
     */
    function exists(uint256 _id) external view returns (bool) {
        return _owners[_id] != address(0);
    }

    /*----------------------------------------------------------*|
    |*  # ERC-165                                               *|
    |*----------------------------------------------------------*/

    /**
     * @dev See {IERC165-supportsInterface}.
     * `supportsInterface()` was first implemented by all contracts and later all implementations removed, hardcoding interface IDs in order to save some gas and simplify the code.
     */
    function supportsInterface(
        bytes4 interfaceId
    ) external pure returns (bool) {
        return
            interfaceId == 0x80ac58cd || // type(IERC721).interfaceId
            interfaceId == 0x780e9d63 || // type(IERC721Enumerable).interfaceId
            interfaceId == 0x01ffc9a7 || // type(IERC165).interfaceId
            interfaceId == 0x2a55205a || // type(IERC2981).interfaceId
            interfaceId == 0x7965db0b; // type(IAccessControl).interfaceId;
    }

    /*----------------------------------------------------------*|
    |*  # INITIALIZATION                                        *|
    |*----------------------------------------------------------*/

    /**
     * @dev Grants `DEFAULT_ADMIN_ROLE` and `MINTER_ROLE` to the account that deploys the contract.
     *      `MINTER_ROLE` is needed in case the deployer may want to use or allow other accounts to mint on their self-sovreign collection
     */
    function initialize(bytes calldata _data) external {
        require(msg.sender == _FACTORY);

        address owner;
        (name, symbol, owner) = abi.decode(_data, (string, string, address));

        // setRoyaltyInfo(royaltyRecipient, royaltyBps);

        _grantRole(DEFAULT_ADMIN_ROLE, owner); // DEFAULT_ADMIN_ROLE is by default admin of all other roles, i.e. MINTER_ROLE, meaning it can assign MINTER_ROLE to other addresses _grantRole(MINTER_ROLE, msg.sender); // grant MINTER_ROLE to factory contract
        _grantRole(MINTER_ROLE, owner); // grant MINTER_ROLE to owner, this way minting requires only checking for MINTER_ROLE rather than DEFAULT_ADMIN_ROLE, allowing the deployer/admin to grant MINTER_ROLE to other addresses.
    }

    constructor(address factory_) {
        _FACTORY = factory_;
    }
}

File 2 of 11 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity 0.8.19;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

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

File 3 of 11 : DecodeTokenURI.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

/// @dev stripped down version of https://github.com/MrChico/verifyIPFS/
library DecodeTokenURI {
    bytes constant ALPHABET =
        "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";

    /**
     * @dev Converts hex string to base 58
     */
    function toBase58(
        bytes memory source
    ) internal pure returns (bytes memory) {
        if (source.length == 0) return new bytes(0);
        uint8[] memory digits = new uint8[](64);
        digits[0] = 0;
        uint8 digitlength = 1;
        for (uint256 i = 0; i < source.length; ++i) {
            uint256 carry = uint8(source[i]);
            for (uint256 j = 0; j < digitlength; ++j) {
                carry += uint256(digits[j]) * 256;
                digits[j] = uint8(carry % 58);
                carry = carry / 58;
            }

            while (carry > 0) {
                digits[digitlength] = uint8(carry % 58);
                digitlength++;
                carry = carry / 58;
            }
        }
        return toAlphabet(reverse(truncate(digits, digitlength)));
    }

    function toAlphabet(
        uint8[] memory indices
    ) private pure returns (bytes memory) {
        bytes memory output = new bytes(indices.length);
        for (uint256 i = 0; i < indices.length; i++) {
            output[i] = ALPHABET[indices[i]];
        }
        return output;
    }

    function truncate(
        uint8[] memory array,
        uint8 length
    ) private pure returns (uint8[] memory) {
        uint8[] memory output = new uint8[](length);
        for (uint256 i = 0; i < length; i++) {
            output[i] = array[i];
        }
        return output;
    }

    function reverse(
        uint8[] memory input
    ) private pure returns (uint8[] memory) {
        uint8[] memory output = new uint8[](input.length);
        for (uint256 i = 0; i < input.length; i++) {
            output[i] = input[input.length - 1 - i];
        }
        return output;
    }
}

File 4 of 11 : Address.sol
/*----------------------------------------------------------*|
|*          ███    ██ ██ ███    ██ ███████  █████           *|
|*          ████   ██ ██ ████   ██ ██      ██   ██          *|
|*          ██ ██  ██ ██ ██ ██  ██ █████   ███████          *|
|*          ██  ██ ██ ██ ██  ██ ██ ██      ██   ██          *|
|*          ██   ████ ██ ██   ████ ██      ██   ██          *|
|*----------------------------------------------------------*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        (bool success, ) = recipient.call{value: amount}("");
        require(success);
    }

    /**
     * @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.
     *
     */
    function functionCall(
        address target,
        bytes memory data
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.call(data);
        return verifyCallResult(success, returndata);
    }

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

    /**
     * @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.
     *
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata
    ) private pure returns (bytes memory) {
        if (success) return returndata;
        else revert();
    }

    /**
     * @notice Query if a contract implements an interface, does not check ERC165 support
     * @param account The address of the contract to query for support of an interface
     * @param encodedParams prepare staticcall; encoded function selector and parameters
     * @return true if the contract at account indicates support of the interface with
     * identifier interfaceId, false otherwise.
     * Note that this function returns the actual result of the query: it does not
     * `revert`, It is up to the caller to decide what to do in these cases.
     */
    function _staticcallUnchecked(
        bytes memory encodedParams,
        address account
    ) private view returns (bool) {
        /**
         * perform static call
         * `staticcall(g, a, in, insize, out, outsize)` identical to `call(g, a, 0, in, insize, out, outsize)` but do not allow state modifications.
         * call contract at address a with input mem[in…(in+insize)) providing g gas and v wei and output area mem[out…(out+outsize)) returning 0 on error (eg. out of gas) and 1 on success
         * - https://docs.soliditylang.org/en/latest/yul.html#yul-call-return-area
         * encoded params example: `bytes memory encodedParams = abi.encodeWithSelector(IERC165.supportsInterface.selector, interfaceId);`
         *
         */
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly {
            success := staticcall(
                30000, // gas
                account, // address
                add(encodedParams, 0x20), // encoded encodedParams input and offset indicating at which bytes index the string starts. Here 0x20 (in hex) = 32 (in decimals). add(encodedParams, 32) it moves the pointer to the raw encodedParams skipping the size field.
                mload(encodedParams), // input size. mload(encodedParams) read 32 bytes pointed by encodedParams (it returns the length of encodedParams)
                0x00, // output
                0x20 // output size
            )
            // Setting output and output size to 0 is due to historical reason. In early EVM versions you had to know the output size in advance, it was a limiting factor for some kind of operations (proxy contracts) so in the Bizantium fork new opcodes were introduced ReturnDataSize and ReturnDataCopy. This allow the caller to determine the output size after the call (ReturnDataSize) and allowing copying to memory (ReturnDataCopy).
            returnSize := returndatasize() // how much memory do we need to allocate for the response
            returnValue := mload(0x00)
        }
        return success && returnSize >= 0x20 && returnValue > 0;
    }
}

File 5 of 11 : ERC2981NSovreign.sol
/*----------------------------------------------------------*|
|*          ███    ██ ██ ███    ██ ███████  █████           *|
|*          ████   ██ ██ ████   ██ ██      ██   ██          *|
|*          ██ ██  ██ ██ ██ ██  ██ █████   ███████          *|
|*          ██  ██ ██ ██ ██  ██ ██ ██      ██   ██          *|
|*          ██   ████ ██ ██   ████ ██      ██   ██          *|
|*----------------------------------------------------------*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

/*************************************************************
 * @title ERC2981NSovreign                                    *
 *                                                           *
 * @notice adds ERC2981 support to ERC-721.                  *
 *                                                           *
 * @dev Royalties BPS and recipient are token level        *
 * and may be set by owner in child contract by writing      *
 * directly to internal storage variables                    *
 *                                                           *
 * @dev Royalty information can be specified globally for    *
 * all token ids via {ERC2981-_setDefaultRoyalty}, and/or    *
 * individually for specific token ids via                   *
 * {ERC2981-_setTokenRoyalty}. The latter takes precedence.  *
 *                                                           *
 * @custom:security-contact [email protected]                    *
 ************************************************************/

contract ERC2981NSovreign {
    struct Recipient {
        address recipient;
        uint24 bps;
    }

    struct RoyaltyInfoArray {
        address[] recipients;
        uint24[] bps;
        uint24 royaltyBps;
    }
    /**
     * @notice `royaltyRecipients` maps token ID to original artist, used for sending royalties to royaltyRecipients on all secondary sales.
     *      In self-sovreign editions there are token level royalty recipients
     * @dev "If you plan on having a contract where NFTs are created by multiple authors AND they can update royalty details after minting,
     *      you will need to record the original author of each token." - https://forum.openzeppelin.com/t/setting-erc2981/16065/2
     */

    mapping(uint256 => RoyaltyInfoArray) private _royaltyInfoArray;

    uint24 private constant TOTAL_SHARES = 10000; // 10,000 = 100% (total sale price)

    /**
     * @notice Called with the sale price to determine how much royalty
     *          is owed and to whom.
     * @param _tokenId - the NFT asset queried for royalty information
     * @param _salePrice - the sale price of the NFT asset specified by _tokenId
     * @return recipient - address of who should be sent the royalty payment
     * @return royaltyAmount - the royalty payment amount for _salePrice
     */
    function royaltyInfo(
        uint256 _tokenId,
        uint256 _salePrice
    ) external view returns (address recipient, uint256 royaltyAmount) {
        recipient = _royaltyInfoArray[_tokenId].recipients[0];
        royaltyAmount =
            (_salePrice * _royaltyInfoArray[_tokenId].royaltyBps) /
            TOTAL_SHARES;
    }

    function getRecipients(
        uint256 _tokenId
    ) external view returns (Recipient[] memory) {
        uint24[] memory _bps = _royaltyInfoArray[_tokenId].bps;
        address[] memory _recipients = _royaltyInfoArray[_tokenId].recipients;

        uint256 i = _recipients.length;

        Recipient[] memory _royaltyInfo = new Recipient[](i);

        do {
            --i;
            _royaltyInfo[i].recipient = _recipients[i];
            _royaltyInfo[i].bps = _bps[i];
        } while (i > 0);

        return _royaltyInfo;
    }

    /**
     * @notice Called with the sale price to determine how much royalty
     *          is owed and to whom.
     * @param _tokenId - the NFT asset queried for royalty information
     * @param royaltyBps_ - The actual royalty bps, calculated on the total sale amount
     * @param recipientsBps_ - array containing the bps of each recipient. This bps is calculated on the royalty amount and the sum of this array must be 10000 (100%)
     * @param royaltyRecipients_ - array of the recipients
     */
    function _setRoyalties(
        uint256 _tokenId,
        uint24 royaltyBps_,
        uint24[] calldata recipientsBps_,
        address[] calldata royaltyRecipients_
    ) internal {
        require(royaltyBps_ <= TOTAL_SHARES);
        uint256 i = recipientsBps_.length;
        require(i == royaltyRecipients_.length);

        uint24 sum;

        do {
            unchecked {
                --i;
                sum += recipientsBps_[i];
            }
        } while (i > 0);

        // the sum has to be equal to 100%
        require(sum == TOTAL_SHARES);

        _royaltyInfoArray[_tokenId].recipients = royaltyRecipients_;
        _royaltyInfoArray[_tokenId].bps = recipientsBps_;
        _royaltyInfoArray[_tokenId].royaltyBps = royaltyBps_;
    }

    function _resetTokenRoyalty(uint256 _tokenId) internal {
        delete _royaltyInfoArray[_tokenId];
    }
}

File 6 of 11 : ERC721URIStorage.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity 0.8.19;

import "../ERC721.sol";
import "../../../utils/DecodeTokenURI.sol";

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

    /**
     * @dev Hardcoded base URI in order to remove the need for a constructor, it can be set anytime by an admin (multisig).
     */
    string private _baseTokenURI = "ipfs://";

    /**
     * @dev Optional mapping for token URIs
     */
    mapping(uint256 => bytes32) private _tokenURIs;

    // using Strings for uint256;

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

    /**
     * @dev See {IERC721Metadata-tokenURI}. It needs to be overridden because the new OZ contracts concatenate _baseURI + tokenId instead of _baseURI + _tokenURI
     */
    function tokenURI(uint256 tokenId) external view returns (string memory) {
        require(_exists(tokenId), "ERC721: nonexistent token");

        return
            string( // once hex encoded base58 is converted to string, we get the initial IPFS hash
                abi.encodePacked(
                    _baseTokenURI,
                    abi
                    .encodePacked( // full bytes of base58 + hex encoded IPFS hash example.
                        bytes2(0x1220), // prepending 2 bytes IPFS hash identifier that was removed before storing the hash in order to fit in bytes32. 0x1220 is "Qm" base58 and hex encoded
                        _tokenURIs[tokenId] // tokenURI (IPFS hash) with its first 2 bytes truncated, base58 and hex encoded returned as bytes32
                    ).toBase58()
                )
            );
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     * @dev only called when a new token is minted, therefore `require(_exists(tokenId))` check was removed
     * Since Openzeppelin contracts v4.0 the _setTokenURI() function was removed, instead we must append the tokenID directly to this variable returned by _baseURI() internal function.
     * This contract implements all the required functionality from ERC721URIStorage, which is the OpenZeppelin extension for supporting _setTokenURI.
     * See https://forum.openzeppelin.com/t/why-doesnt-openzeppelin-erc721-contain-settokenuri/6373 and https://forum.openzeppelin.com/t/function-settokenuri-in-erc721-is-gone-with-pragma-0-8-0/5978/2
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, bytes32 _tokenURI) internal {
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @notice Optional function to set the base URI
     * @dev child contract MAY require access control to the external function implementation
     */
    function _setBaseURI(string calldata baseURI_) internal {
        // require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender));
        _baseTokenURI = baseURI_;
    }

    /**
     * @dev See {ERC721-_burn}.
     */
    function _burn(uint256 _tokenId) internal virtual override {
        super._burn(_tokenId);

        delete _tokenURIs[_tokenId];
    }

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

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

File 7 of 11 : ERC721Enumerable.sol
/*----------------------------------------------------------*|
|*          ███    ██ ██ ███    ██ ███████  █████           *|
|*          ████   ██ ██ ████   ██ ██      ██   ██          *|
|*          ██ ██  ██ ██ ██ ██  ██ █████   ███████          *|
|*          ██  ██ ██ ██ ██  ██ ██ ██      ██   ██          *|
|*          ██   ████ ██ ██   ████ ██      ██   ██          *|
|*----------------------------------------------------------*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import "../ERC721.sol";

/*************************************************************
 * @title ERC721Enumerable                                   *
 *                                                           *
 * @dev This implements an optional extension of {ERC721}    *
 *      defined in the EIP that adds enumerability of all    *
 *      the token ids in the contract as well as all token   *
 *      ids owned by each account.                           *
 *                                                           *
 * @custom:security-contact [email protected]                    *
 ************************************************************/
abstract contract ERC721Enumerable is ERC721 {
    function tokenOfOwnerByIndex(
        address _owner,
        uint256 _index
    ) external view returns (uint256) {
        require(_owner == ownerOf(_index));
        return _index;
    }

    /// @notice Count NFTs tracked by this contract
    /// @return A count of valid NFTs tracked by this contract, where each one of
    ///  them has an assigned and queryable owner not equal to the zero address
    function totalSupply() external view returns (uint256) {
        return _owners.length;
    }

    /// @notice Enumerate valid NFTs
    /// @dev Throws if `_index` >= `totalSupply()`.
    /// @param _index A counter less than `totalSupply()`
    /// @return The token identifier for the `_index`th NFT,
    ///  (sort order not specified)
    function tokenByIndex(uint256 _index) external view returns (uint256) {
        require(_exists(_index));
        return _index;
    }
}

File 8 of 11 : ERC721Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import "../ERC721.sol";

/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be burned (destroyed).
 */
abstract contract ERC721Burnable is ERC721 {
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 _tokenId) external {
        require(_isApprovedOrOwner(msg.sender, _tokenId));
        _burn(_tokenId);
    }
}

File 9 of 11 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

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

File 10 of 11 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import "./IERC721Receiver.sol";
import "../../utils/Address.sol";
import "../../utils/Strings.sol";

/**
 * @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}.
 * @dev removed constructor in order to allow name and symbol to be set by facory clones contracts via the `initialize` function instead.
 *      name and symbol should be set in most derived contract's constructor instead
 */
contract ERC721 {
    using Address for address;
    using Strings for uint256;

    // Token name
    string public name;

    // Token symbol
    string public symbol;

    // array of token owners, accessed in {NinfaERC721-totalSupply}
    address[] internal _owners;

    // 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 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 See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0));
        return owner;
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) external {
        address owner = ownerOf(tokenId);

        require(msg.sender == owner || _operatorApprovals[owner][msg.sender]);

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) external {
        _setApprovalForAll(msg.sender, operator, approved);
    }

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

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(msg.sender, tokenId));

        _transfer(from, to, tokenId);
    }

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

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes memory _data
    ) public {
        require(_isApprovedOrOwner(msg.sender, _tokenId));
        _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
    ) private {
        _transfer(_from, _to, _tokenId);
        require(_checkOnERC721Received(_from, _to, _tokenId, _data));
    }

    /**
     * @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.
     *      Emits a {Transfer} event.
     * @param _tokenId MUST exist.
     */
    function _burn(uint256 _tokenId) internal virtual {
        // Clear approvals
        delete _tokenApprovals[_tokenId];

        delete _owners[_tokenId]; // equivalent to Openzeppelin's `_balances[owner] -= 1`

        emit Transfer(msg.sender, address(0), _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 returns (bool) {
        return _owners[tokenId] != address(0);
    }

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

    /**
     * @dev Mints `tokenId` and transfers it to `to`. Doesn't support safe transfers while minting, i.e. doesn't call onErc721Received function because when minting the receiver is msg.sender.
     * We don’t need to zero address check because msg.sender is never the zero address.
     * Because the tokenId is always incremented, we don’t need to check if the token exists already.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address _to, uint256 _tokenId) internal {
        _owners.push(_to);

        emit Transfer(address(0), _to, _tokenId);
    }

    /**
     * @dev rather than calling the internal `_mint` function which would create a new owner like so `_owners.push(_to)`,
     *      however ownership will be reassigned/overridden with the buyer's address by the time the `lazyMint` function has finished executing
     *      therefore the `transfer` event is emitted in order to signal to DApps that a mint has occurred
     */
    function _mintAndTransfer(
        address _minter,
        address _recipient,
        uint256 _tokenId,
        bytes calldata _data
    ) internal {
        /*----------------------------------------------------------*|
        |*  # MINT                                                  *|
        |*----------------------------------------------------------*/

        emit Transfer(address(0), _minter, _tokenId);

        /*----------------------------------------------------------*|
        |*  # SAFE TRANSFER                                         *|
        |*----------------------------------------------------------*/

        _owners.push(_recipient);

        emit Transfer(_minter, _recipient, _tokenId);

        require(_checkOnERC721Received(_minter, _recipient, _tokenId, _data));
    }

    /**
     * @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) private {
        require(ownerOf(tokenId) == from);
        require(to != address(0));

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

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

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) private {
        require(owner != operator);
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @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 _to target address that will receive the tokens
     * @param _from address representing the previous owner of the given token ID
     * @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.code.length > 0)
            return
                IERC721Receiver(_to).onERC721Received(
                    msg.sender, // operator
                    _from, // from
                    _tokenId,
                    _data
                ) == 0x150b7a02;
        // IERC721Receiver.onERC721Received.selector,
        else return true;
    }

    /**
     * @dev WARNING this function SHOULD only be called by frontends due to unbound loop
     * @dev public visibility as it is needed by
     */
    function balanceOf(address owner) public view returns (uint256) {
        uint256 count = 0;
        uint256 totalSypply = _owners.length;
        for (uint256 i; i < totalSypply; i++) {
            if (owner == _owners[i]) count++;
        }
        return count;
    }

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning.
     *
     * 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.
     */
    function _afterTokenTransfer(
        address _from,
        address _to,
        uint256 _tokenId
    ) internal virtual {}
}

File 11 of 11 : AccessControl.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(
        bytes32 role,
        bytes32 previousAdminRole,
        bytes32 newAdminRole
    );

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

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

    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 internal constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, msg.sender);
        _;
    }

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

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert("Account is missing role");
        }
    }

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

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

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

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

        _revokeRole(role, account);
    }

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

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

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

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

Contract ABI

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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.