Token

Proof Of Stake Pages (PoSp)

Feature Tip: Add private address tag to any address under My Name Tag !

ERC-721

Overview

Max Total Supply

71,842 PoSp

Holders

71,842

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A

Other Info

Token Contract

0x5bf5bcc5362f88721167c1068b58c60cad075aac

Filtered by Token Holder

0x31d61dD86904f012BC736791c2E3E94D50a43C0c

Balance

1 PoSp

0x31d61dd86904f012bc736791c2e3e94d50a43c0c

OVERVIEW

Vitalik is committed to supporting open-source public goods, he's releasing a book on September 13. We're pre-gaming by raising funds for public goods with a truly unique NFT, where Vitalik signs a message directly on your token. This token is then inserted into your digital copy upon the books release!

#	Exchange	Pair	Price	24H Volume	% Volume

Contract Source Code Verified (Exact Match)

Contract Name:

ProofOfStake_Pages

Compiler Version

v0.8.12+commit.f00d7308

Optimization Enabled:

Yes with 100 runs

Other Settings:

default evmVersion, Apache-2.0 license

Contract Source Code (Solidity Standard Json-Input format)

IDE

File 1 of 17 : ProofOfStake_Pages.sol

pragma solidity >=0.8.0 <0.9.0;

//SPDX-License-Identifier: Apache-2.0
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import {Base64} from "base64-sol/base64.sol";
import {Transforms} from "./libs/Transforms.sol";

error Soulbound();
error PledgingDisabled();
error NotMinimumPledge();
error SendFailed();
error InvalidSignature();
error ZeroSignature();
error DoesNotExist();

abstract contract ENS_Resolver {
    function getNames(address[] calldata addresses)
        external
        view
        virtual
        returns (string[] memory);
}

contract ProofOfStake_Pages is ERC721Enumerable, Ownable, ReentrancyGuard {
    ENS_Resolver res = ENS_Resolver(0x3671aE578E63FdF66ad4F3E12CC0c0d71Ac7510C);

    using Counters for Counters.Counter;
    using Strings for uint256;

    /*///////////////////////////////////////////////////////////////
                            TOKEN STORAGE
    //////////////////////////////////////////////////////////////*/

    Counters.Counter private _tokenIds;

    bool public pledgeOpen;

    // confirm with team
    uint256 internal constant price = 0.0001337 ether;

    uint256 internal constant tokenlimitperuser = 1;

    uint256 internal constant publisherSplit = 10;

    mapping(address => uint256) public pledgeLimit;

    mapping(address => uint256) public udonationTotal;

    //prettier-ignore
    address internal immutable gitcoin = 0xde21F729137C5Af1b01d73aF1dC21eFfa2B8a0d6;

    //prettier-ignore
    address internal immutable sevenStories = 0x209D3040C2dEdcb7124be89Fc6849423621EdeaC;

    string public contractAddressString =
        Transforms.toAsciiString(address(this));

    string public currentMessage;

    struct Token {
        string recipient;
        address rAddress;
        string sigValue;
        string timestamp;
        string writtenMsg;
    }

    Token[] private tokens;

    /*///////////////////////////////////////////////////////////////
                               EVENTS
    //////////////////////////////////////////////////////////////*/

    event Pledge(address indexed pledgee, uint256 indexed pledgeValue);

    /*///////////////////////////////////////////////////////////////
                           EIP-712 STORAGE
    //////////////////////////////////////////////////////////////*/

    //prettier-ignore
    address internal immutable vitalik = 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045;

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    bytes32 public constant AUTOGRAPH_TYPEHASH =
        keccak256(
            "signature(address sender,address recipient,string pledge,string timestamp,string msg)"
        );

    /*///////////////////////////////////////////////////////////////
                              STRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(address[] memory _donors, uint256[] memory _amounts)
        ERC721("Proof Of Stake Pages", "PoSp")
    {
        transferOwnership(0xb010ca9Be09C382A9f31b79493bb232bCC319f01);

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();

        for (uint256 i = 0; i < _donors.length; ++i) {
            pledgeLimit[_donors[i]] = pledgeLimit[_donors[i]] + 1;

            string memory resolved = resolveENS(_donors[i]);

            udonationTotal[_donors[i]] += _amounts[i];

            _tokenIds.increment();
            uint256 id = _tokenIds.current();

            _mint(_donors[i], id);

            tokens.push(
                Token({
                    recipient: resolved,
                    rAddress: _donors[i],
                    sigValue: _amounts[i].toString(),
                    timestamp: block.timestamp.toString(),
                    writtenMsg: "Thank you for believing."
                })
            );

            emit Pledge(_donors[i], _amounts[i]);
        }
    }

    /*///////////////////////////////////////////////////////////////
                             PLEDGE LOGIC
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Pledges ETH to GTC & "whitelists" pledger
     */
    //prettier-ignore
    function pledge() public payable nonReentrant {
        if (pledgeOpen == false) revert PledgingDisabled();
        
        if (msg.value < price) revert NotMinimumPledge();

        string memory resolved = resolveENS(msg.sender);

        uint sShare = (msg.value * publisherSplit) / 100;

        if (pledgeLimit[msg.sender] >= tokenlimitperuser) {
        (bool success3, ) = gitcoin.call{value: msg.value - sShare}("");
        if (!success3) revert SendFailed();
        
        (bool success4, ) = sevenStories.call{value: sShare}("");
        if (!success4) revert SendFailed();
        
        udonationTotal[msg.sender] +=  msg.value;

        pledgeLimit[msg.sender] = pledgeLimit[msg.sender] + 1;

        return;
        }

        (bool success, ) = gitcoin.call{value: msg.value - sShare}("");
        if (!success) revert SendFailed();

        (bool success2, ) = sevenStories.call{value: sShare}("");
        if (!success2) revert SendFailed();

        udonationTotal[msg.sender] +=  msg.value;

        pledgeLimit[msg.sender] = pledgeLimit[msg.sender] + 1;

        _tokenIds.increment();
        uint256 id = _tokenIds.current();

        _mint(msg.sender, id);

        tokens.push(Token({
                recipient: resolved,
                rAddress: msg.sender,
                sigValue: msg.value.toString(),
                timestamp: block.timestamp.toString(),
                writtenMsg: currentMessage
            }));

        emit Pledge(msg.sender, msg.value);
    }

    function setMessage(string calldata _message) external {
        require(msg.sender == vitalik);
        require(bytes(_message).length <= 60);

        currentMessage = _message;
    }

    function resolveENS(address _user) internal view returns (string memory) {
        string memory resolved;

        address[] memory forCall = new address[](1);

        forCall[0] = _user;

        string[] memory callres = res.getNames(forCall);

        if (bytes(callres[0]).length == 0) {
            resolved = string.concat("0x", Transforms.toAsciiString(_user));
        } else {
            resolved = callres[0];
        }

        return resolved;
    }

    /**
     * @notice Updates the user token if we have a valid msg from Vitalik
     */
    //prettier-ignore
    function updateIfSigned(
        bytes calldata _signature,
        string calldata _sigValue,
        string calldata _timestamp,
        string calldata _message
    ) external nonReentrant {

        (uint8 v, bytes32 r, bytes32 s) = Transforms.splitSignature(_signature);

        bytes32 hashStruct = keccak256(
            abi.encode(
                AUTOGRAPH_TYPEHASH,
                // Will be wockis address in live v
                vitalik,
                // Signature will be invalid if it isn't to caller &&
                // EIP712: "Addresses are encoded as uint160"
                uint160(msg.sender),
                // EIP712: "values bytes and string are encoded as a keccak256 hash"
                keccak256(bytes(_sigValue)),
                keccak256(bytes(_timestamp)),
                keccak256(bytes(_message))
            )
        );

        bytes32 hash = keccak256(
            abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR(), hashStruct)
        );
        address signer = ecrecover(hash, v, r, s);

        if (signer != vitalik) revert InvalidSignature();
        if (signer == address(0)) revert ZeroSignature();

        uint256 tokenid = tokenOfOwnerByIndex(msg.sender, 0) - 1;

        tokens[tokenid].writtenMsg = _message;
    }

    /**
     * @notice Toggles Pledging On / Off
     */
    function togglePledging() public onlyOwner {
        pledgeOpen == false ? pledgeOpen = true : pledgeOpen = false;
    }

    /*///////////////////////////////////////////////////////////////
                            TOKEN LOGIC
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice SOULBOUND: Block transfers.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override(ERC721Enumerable) {
        require(
            from == address(0) || to == address(0),
            "SOULBOUND: Non-Transferable"
        );
        super._beforeTokenTransfer(from, to, tokenId);
    }

    /**
     * @notice SOULBOUND: Block approvals.
     */
    function setApprovalForAll(address operator, bool _approved)
        public
        virtual
        override(ERC721, IERC721)
    {
        revert Soulbound();
    }

    /**
     * @notice SOULBOUND: Block approvals.
     */
    function approve(address to, uint256 tokenId)
        public
        virtual
        override(ERC721, IERC721)
    {
        revert Soulbound();
    }

    /**
     * @notice Generate SVG using tParams by index
     */
    function generateSVG(uint256 id) private view returns (bytes memory) {
        bytes memory eth;

        bytes memory message;

        if (bytes(tokens[id].writtenMsg).length == 0) {
            message = bytes.concat(
                abi.encodePacked(
                    '<tspan text-anchor="middle" x="37.5%" y="120">',
                    "</tspan>"
                )
            );
        } else {
            message = bytes.concat(
                abi.encodePacked(
                    '<tspan text-anchor="middle" x="37.5%" y="120">"',
                    tokens[id].writtenMsg,
                    '"</tspan>'
                )
            );
        }

        uint256 eth1 = udonationTotal[tokens[id].rAddress];

        uint256 eth3 = eth1 / 1 ether;

        if (eth1 <= 999999999999999999) {
            eth = bytes.concat(
                abi.encodePacked(
                    '<tspan text-anchor="middle" x="37.5%" y="260">',
                    eth1.toString(),
                    " (wei)",
                    "</tspan>"
                )
            );
        } else {
            eth = bytes.concat(
                abi.encodePacked(
                    '<tspan text-anchor="middle" x="37.5%" y="260">',
                    eth3.toString(),
                    " (eth)",
                    "</tspan>"
                )
            );
        }

        return
            bytes.concat(
                abi.encodePacked(
                    '<svg xmlns="http://www.w3.org/2000/svg" width="606.2" height="819.4" viewBox="0 0 606.2 819.4"><defs><style>.a{fill:#fff;}.b{fill:none;stroke:#d9c8db;stroke-miterlimit:10;stroke-width:2px;}.c,.d,.e,.f,.g,.h,.i,.j,.k,.l,.m,.n,.o{isolation:isolate;}.c,.d,.e,.f,.g,.i,.j,.k{font-size:55px;}.c,.e{fill:#e96b5d;}.c,.d,.e,.f,.g,.k{font-family:LustDisplay-Didone, Lust Didone;}.d,.f{fill:#9b4a8d;}.e{letter-spacing:0.02em;}.f{letter-spacing:0.02em;}.g{fill:#9b4a8c;}.h{font-size:45px;fill:#0cb6ea;font-family:Lust-Italic, Lust;font-style:italic;}.i,.k{fill:#50ae58;}.i,.j{font-family:Lust-Regular, Lust;letter-spacing:0.05em;}.j{fill:#ef8916;}.l,.m{font-size:29.99px;}.l,.n{font-family:Arial-BoldMT, Arial;font-weight:700;}.m,.o{font-family:ArialMT, Arial; margin-left: auto; margin-right: auto; width: 40%;}.n{font-size:20px;}.o{font-size:18px;}</style></defs><rect class="a" width="606.2" height="819.4"/><text class="n"><tspan class="n" text-anchor="middle" x="50%" y="42%">',
                    tokens[id].recipient,
                    '</tspan></text><text transform="translate(75 352.85)" font-size="18" font-family="ArialMT, Arial"><tspan text-anchor="middle" x="37.5%" y="200">',
                    tokens[id].timestamp,
                    "</tspan>",
                    eth
                ),
                abi.encodePacked(
                    '<tspan text-anchor="middle" x="37.5%" y="320">0x',
                    contractAddressString,
                    "</tspan>",
                    message,
                    '<tspan text-anchor="middle" x="37.5%" y="220">mint timestamp</tspan>',
                    '<tspan text-anchor="middle" x="37.5%" y="340">contract</tspan>',
                    '<tspan text-anchor="middle" x="37.5%" y="280">value</tspan><tspan text-anchor="middle" x="37.5%" y="140"></tspan></text>',
                    '<rect class="b" x="21.9" y="169.5" width="562.4" height="562.4"/><g style="isolation:isolate"><path d="M46.66,98.93v-.28h4.89V60.71H46.66v-.28H65.91c12,0,18.42,3.19,18.42,11.17,0,9.4-11.77,11.27-19.85,11.27h-1.6V98.65h5.83v.28ZM62.88,82.6h1.6c5.83,0,7.75-3.47,7.75-11s-1.92-10.89-7.75-10.89h-1.6Z" style="fill:#e96b5d"/></g><g style="isolation:isolate"><path d="M135,91.84c0,5.16-2.26,7.53-9.21,7.53-6.74,0-9.43-2.28-11.55-8.63C113,87,112.44,79.52,107.52,79.52h-1.6V98.65h5.28v.28H89.7v-.28h4.89V60.71H89.7v-.28H109c5.66,0,18.47.22,18.47,9.46,0,7.54-10.77,9.27-17.32,9.54v.09c10.75,0,13.94,3.52,16.58,9.15,3.33,7.12,4.13,8.17,5.53,8.17,2.2,0,2.47-3.35,2.47-5Zm-29-12.6h1.6c5.44,0,7.81-2.86,7.81-9.35,0-5.11-1.82-9.18-7.79-9.18h-1.62Z" style="fill:#9b4a8d"/></g><g style="isolation:isolate"><path d="M178.65,79.68c0,12.54-8.85,19.69-19.71,19.69s-19.72-7.15-19.72-19.69S148.07,60,158.94,60,178.65,67.14,178.65,79.68Zm-11.8,0c0-8.41-.52-19.41-7.91-19.41S151,71.27,151,79.68s.52,19.41,7.92,19.41S166.85,88.1,166.85,79.68Z" style="fill:#e96b5d"/></g><g style="isolation:isolate"><path d="M226.68,79.68c0,12.54-8.9,19.69-19.83,19.69S187,92.22,187,79.68,195.92,60,206.85,60,226.68,67.14,226.68,79.68Zm-11.87,0c0-8.41-.52-19.41-8-19.41s-8,11-8,19.41.52,19.41,8,19.41S214.81,88.1,214.81,79.68Z" style="fill:#9b4a8d"/></g><g style="isolation:isolate"><path d="M236.69,98.93v-.28h4.89V60.71h-4.89v-.28h33.93L272,73.69h-.27l-.11-1c-.8-7.56-6.82-12-14.3-12h-4.4V79.13h.61c6.18,0,10.2-2.58,10.5-7.72l.05-1h.28l-.93,17.77h-.28l.05-1c.28-5.12-3.49-7.81-9.67-7.81h-.61V98.65h5.83v.28Z" style="fill:#9b4a8c"/></g><g style="isolation:isolate"><path d="M307.71,87.38c0,7.47-6.75,14.17-14.76,14.17-6.43,0-10.89-4.27-10.89-10.21,0-7.7,6.62-14.18,14.72-14.18C303.26,77.16,307.71,81.44,307.71,87.38Zm-8.23-4.64c0-2.65-.5-5.22-2.75-5.22-5,0-6.43,13.86-6.43,18.54,0,2.66.49,5.13,2.7,5.13C298,101.19,299.48,88.05,299.48,82.74Z" style="fill:#0cb6ea"/></g><g style="isolation:isolate"><path d="M300.13,105.46a4.61,4.61,0,0,1,4.68-4.77,3.93,3.93,0,0,1,4.09,4.18,3.26,3.26,0,0,0-2.7,3.29c0,1.08.45,1.93,1.71,1.93,2.12,0,4-2.34,4-5.76,0-2.07-.67-4.32-4-5.49l3.37-22H307.6l0-.36h3.65c.31-6.7,2.52-11.88,9.18-11.88,4.5,0,6.57,2.48,6.57,5.27a4.75,4.75,0,0,1-4.82,5c-2.2,0-4-1.44-4-4.27a3.09,3.09,0,0,0,2.88-3.2c0-1.35-.58-2.29-2.07-2.29-5.31,0-6.84,11.38,1.44,11.38h3.2l0,.36h-4.27L316,98.75c-.86,5.4-3.47,12-9.77,12C302.29,110.72,300.13,108.2,300.13,105.46Z" style="fill:#0cb6ea"/></g><g style="isolation:isolate"><path d="M345.85,98.1l-4.07,1.16-.88-16h.44c.88,6.44,4.45,15.62,14.35,15.62,5,0,9-1.76,9-5.83,0-9.24-24-8.41-24-21.72C340.68,64,347.77,60,356.57,60a39.37,39.37,0,0,1,8.75,1.26l4.18-1.16.71,13.53h-.44c-.88-6.21-4.34-13.19-13.2-13.19-4.4,0-7.42,2.08-7.42,5.66,0,8.41,24,7.09,24,20.79,0,7.75-8.13,12.48-17.43,12.48A41.65,41.65,0,0,1,345.85,98.1Z" style="fill:#50ae58"/><path d="M384.62,98.93v-.44c5.72,0,6.27-3,6.27-9.46V60.88c-8.91,0-12.87,5.33-13.8,13.63h-.44l1.48-14.07H415l1.48,14.07H416c-.93-8.3-4.89-13.63-13.8-13.63V89c0,6.44.55,9.46,6.27,9.46v.44Z" style="fill:#50ae58"/></g><g style="isolation:isolate"><path d="M455.54,88.43c3.46,7.2,5.11,10.06,9.07,10.06v.44H442.18v-.44c5.22,0,4.18-4.18,1.48-9.95l-1.39-3H429.18c-4,8.38-2.59,12.92,3.43,12.92v.44H417.1v-.44c4,0,7.42-4.67,11.71-13.36l12.71-25.79ZM429.45,85H442l-6.11-13.08Z" style="fill:#ef8916"/><path d="M504.71,87.66c4.29,9.51,5.5,10.39,8.14,10.11v.45a36.94,36.94,0,0,1-8.75,1.26c-6.76,0-9.4-2.58-11.43-8.74-1.76-5.34-3.25-11.44-6.77-11.44a4.07,4.07,0,0,0-1.81.46V89c0,6.44.49,9.46,4.56,9.46v.44H467.26v-.44c5.5,0,5.5-3,5.5-9.46V70.33c0-6.65,0-9.46-5.5-9.46v-.43h21.39v.43c-4.07,0-4.56,3-4.56,9.46V79.1l7-7.67c2.36-2.53,5.39-6.16,5.39-8.41,0-1.49-1-2.15-3.63-2.15v-.43h16.66v.43c-7,0-14.68,7.32-18,10.95l-6.48,7a18,18,0,0,1,8.24-2c5.56,0,8.19,3.3,11.44,10.84Z" style="fill:#ef8916"/></g><g style="isolation:isolate"><path d="M552.2,73.69h-.28l-.11-1c-.8-7.56-6.82-12-14.3-12H532V79.13h.61c6.18,0,10.2-2.58,10.5-7.72l.06-1h.27l-.93,17.77h-.28l.06-1c.27-5.12-3.5-7.81-9.68-7.81H532V92c0,5.33.61,6.7,4.4,6.7,9.87,0,16-6.15,17.35-15l.2-1.24h.27l-2.64,16.5h-35.8v-.28h4.89V60.71h-4.89v-.27h35Z" style="fill:#50ae58"/></g><text class="l" transform="translate(235.15 265)">vitalik.eth</text> <text class="m" transform="translate(263.48 295)">signer</text> <text class="m" transform="translate(245.64 373)">recipient</text></svg>'
                )
            );
    }

    /**
     * @notice Generate SVG, b64 encode it, construct an ERC721 token URI.
     */
    function constructTokenURI(uint256 id)
        private
        view
        returns (string memory)
    {
        // prettier-ignore

        uint256 cID = id - 1;

        string memory pageSVG = Base64.encode(bytes(generateSVG(cID)));

        return
            string(
                abi.encodePacked(
                    "data:application/json;base64,",
                    Base64.encode(
                        bytes(
                            abi.encodePacked(
                                '{"signed_to":"',
                                tokens[cID].recipient,
                                '", "external_url":"',
                                "https://proofofstake.gitcoin.co/",
                                '", "timestamp":"',
                                tokens[cID].timestamp,
                                '", "pledge":"',
                                udonationTotal[tokens[cID].rAddress].toString(),
                                '", "message":"',
                                tokens[cID].writtenMsg,
                                '", "image": "',
                                "data:image/svg+xml;base64,",
                                pageSVG,
                                '"}'
                            )
                        )
                    )
                )
            );
    }

    /**
     * @notice Receives json from constructTokenURI
     */
    // prettier-ignore
    function tokenURI(uint256 id)
        public
        view
        override
        returns (string memory)
    {
        if (!_exists(id)) revert DoesNotExist();
        return constructTokenURI(id);
    }

    function contractURI() external pure returns (string memory) {
        return
            string(
                abi.encodePacked(
                    "data:application/json;base64,",
                    Base64.encode(
                        bytes(
                            abi.encodePacked(
                                "{",
                                '"name":"',
                                "Proof of Stake",
                                '",'
                                '"description":"',
                                "Vitalik is committed to supporting open-source public goods, he's releasing a book on September 13. We're pre-gaming by raising funds for public goods with a truly unique NFT, where Vitalik signs a message directly on your token. This token is then inserted into your digital copy upon the books release!",
                                '",'
                                '"image_data":"',
                                // Yeah, looks like CORS may not be letting this resolve, fix l8r
                                "",
                                '",'
                                '"external_link":"',
                                "https://proofofstake.gitcoin.co/",
                                '",'
                                '"seller_fee_basis_points":"',
                                "0",
                                '",'
                                '"fee_recipient":"',
                                "0x00",
                                '"}'
                            )
                        )
                    )
                )
            );
    }

    /*///////////////////////////////////////////////////////////////
                             SIG LOGIC
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice https://eips.ethereum.org/EIPS/eip-712
     */
    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return
            block.chainid == INITIAL_CHAIN_ID
                ? INITIAL_DOMAIN_SEPARATOR
                : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256(
                        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                    ),
                    keccak256(bytes("ProofOfStake_Pages")),
                    keccak256(bytes("0")),
                    block.chainid,
                    address(this)
                )
            );
    }
}

File 2 of 17 : Ownable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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() {
        _setOwner(_msgSender());
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 3 of 17 : ReentrancyGuard.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 4 of 17 : ERC721.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.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}.
 */
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: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        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) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        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 overriden 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 owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_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: transfer caller is not owner nor 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: transfer caller is not owner nor 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 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 _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 virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, 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);

        _balances[to] += 1;
        _owners[tokenId] = to;

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

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

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

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

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

    /**
     * @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 of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

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

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

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

    /**
     * @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 {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 5 of 17 : IERC721.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, 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 be 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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * 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 Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

    /**
     * @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;
}

File 6 of 17 : IERC721Receiver.sol

// SPDX-License-Identifier: MIT

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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 7 of 17 : ERC721Enumerable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 8 of 17 : IERC721Enumerable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 9 of 17 : IERC721Metadata.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

File 10 of 17 : Address.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 11 of 17 : Context.sol

// SPDX-License-Identifier: MIT

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 12 of 17 : Counters.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 13 of 17 : Strings.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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 14 of 17 : ERC165.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

File 15 of 17 : IERC165.sol

// SPDX-License-Identifier: MIT

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 16 of 17 : base64.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0;

/// @title Base64
/// @author Brecht Devos - <[email protected]>
/// @notice Provides functions for encoding/decoding base64
library Base64 {
    string internal constant TABLE_ENCODE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    bytes  internal constant TABLE_DECODE = hex"0000000000000000000000000000000000000000000000000000000000000000"
                                            hex"00000000000000000000003e0000003f3435363738393a3b3c3d000000000000"
                                            hex"00000102030405060708090a0b0c0d0e0f101112131415161718190000000000"
                                            hex"001a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132330000000000";

    function encode(bytes memory data) internal pure returns (string memory) {
        if (data.length == 0) return '';

        // load the table into memory
        string memory table = TABLE_ENCODE;

        // multiply by 4/3 rounded up
        uint256 encodedLen = 4 * ((data.length + 2) / 3);

        // add some extra buffer at the end required for the writing
        string memory result = new string(encodedLen + 32);

        assembly {
            // set the actual output length
            mstore(result, encodedLen)

            // prepare the lookup table
            let tablePtr := add(table, 1)

            // input ptr
            let dataPtr := data
            let endPtr := add(dataPtr, mload(data))

            // result ptr, jump over length
            let resultPtr := add(result, 32)

            // run over the input, 3 bytes at a time
            for {} lt(dataPtr, endPtr) {}
            {
                // read 3 bytes
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)

                // write 4 characters
                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(shr( 6, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(        input,  0x3F))))
                resultPtr := add(resultPtr, 1)
            }

            // padding with '='
            switch mod(mload(data), 3)
            case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }
            case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) }
        }

        return result;
    }

    function decode(string memory _data) internal pure returns (bytes memory) {
        bytes memory data = bytes(_data);

        if (data.length == 0) return new bytes(0);
        require(data.length % 4 == 0, "invalid base64 decoder input");

        // load the table into memory
        bytes memory table = TABLE_DECODE;

        // every 4 characters represent 3 bytes
        uint256 decodedLen = (data.length / 4) * 3;

        // add some extra buffer at the end required for the writing
        bytes memory result = new bytes(decodedLen + 32);

        assembly {
            // padding with '='
            let lastBytes := mload(add(data, mload(data)))
            if eq(and(lastBytes, 0xFF), 0x3d) {
                decodedLen := sub(decodedLen, 1)
                if eq(and(lastBytes, 0xFFFF), 0x3d3d) {
                    decodedLen := sub(decodedLen, 1)
                }
            }

            // set the actual output length
            mstore(result, decodedLen)

            // prepare the lookup table
            let tablePtr := add(table, 1)

            // input ptr
            let dataPtr := data
            let endPtr := add(dataPtr, mload(data))

            // result ptr, jump over length
            let resultPtr := add(result, 32)

            // run over the input, 4 characters at a time
            for {} lt(dataPtr, endPtr) {}
            {
               // read 4 characters
               dataPtr := add(dataPtr, 4)
               let input := mload(dataPtr)

               // write 3 bytes
               let output := add(
                   add(
                       shl(18, and(mload(add(tablePtr, and(shr(24, input), 0xFF))), 0xFF)),
                       shl(12, and(mload(add(tablePtr, and(shr(16, input), 0xFF))), 0xFF))),
                   add(
                       shl( 6, and(mload(add(tablePtr, and(shr( 8, input), 0xFF))), 0xFF)),
                               and(mload(add(tablePtr, and(        input , 0xFF))), 0xFF)
                    )
                )
                mstore(resultPtr, shl(232, output))
                resultPtr := add(resultPtr, 3)
            }
        }

        return result;
    }
}

File 17 of 17 : Transforms.sol

pragma solidity >=0.8.0 <0.9.0;

//SPDX-License-Identifier: MIT

library Transforms {
    function splitSignature(bytes memory sig)
        internal
        pure
        returns (
            uint8 v,
            bytes32 r,
            bytes32 s
        )
    {
        require(sig.length == 65);

        assembly {
            // first 32 bytes, after the length prefix.
            r := mload(add(sig, 32))
            // second 32 bytes.
            s := mload(add(sig, 64))
            // final byte (first byte of the next 32 bytes).
            v := byte(0, mload(add(sig, 96)))
        }

        return (v, r, s);
    }

    /*///////////////////////////////////////////////////////////////
                             TYPE LOGIC
    //////////////////////////////////////////////////////////////*/

    function toAsciiString(address x) internal pure returns (string memory) {
        bytes memory s = new bytes(40);
        for (uint256 i = 0; i < 20; i++) {
            bytes1 b = bytes1(uint8(uint256(uint160(x)) / (2**(8 * (19 - i)))));
            bytes1 hi = bytes1(uint8(b) / 16);
            bytes1 lo = bytes1(uint8(b) - 16 * uint8(hi));
            s[2 * i] = char(hi);
            s[2 * i + 1] = char(lo);
        }
        return string(s);
    }

    function char(bytes1 b) internal pure returns (bytes1 c) {
        if (uint8(b) < 10) return bytes1(uint8(b) + 0x30);
        else return bytes1(uint8(b) + 0x57);
    }
}

Settings

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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Contract ABI

[{"inputs":[{"internalType":"address[]","name":"_donors","type":"address[]"},{"internalType":"uint256[]","name":"_amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"DoesNotExist","type":"error"},{"inputs":[],"name":"InvalidSignature","type":"error"},{"inputs":[],"name":"NotMinimumPledge","type":"error"},{"inputs":[],"name":"PledgingDisabled","type":"error"},{"inputs":[],"name":"SendFailed","type":"error"},{"inputs":[],"name":"Soulbound","type":"error"},{"inputs":[],"name":"ZeroSignature","type":"error"},{"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":"pledgee","type":"address"},{"indexed":true,"internalType":"uint256","name":"pledgeValue","type":"uint256"}],"name":"Pledge","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":"AUTOGRAPH_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"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":[],"name":"contractAddressString","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"currentMessage","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"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":"pledge","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"pledgeLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pledgeOpen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","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":"string","name":"_message","type":"string"}],"name":"setMessage","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":[],"name":"togglePledging","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"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":[{"internalType":"address","name":"","type":"address"}],"name":"udonationTotal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"_signature","type":"bytes"},{"internalType":"string","name":"_sigValue","type":"string"},{"internalType":"string","name":"_timestamp","type":"string"},{"internalType":"string","name":"_message","type":"string"}],"name":"updateIfSigned","outputs":[],"stateMutability":"nonpayable","type":"function"}]

Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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

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

-----Decoded View---------------
Arg [0] : _donors (address[]): 0xb010ca9Be09C382A9f31b79493bb232bCC319f01,0x09E08a6c3015FA2c0DBafF4Ee2EB659Efd9fe31c,0xB0CCf43adA6CBaA26dcf4907117b496d49f74242,0x8913b99d5efD9e391AdE59168230F6425813D90A,0x1A50a6238eb67285cCD4DF17f75CCe430BAAE2A4,0xA4ca1b15fE81F57cb2d3f686c7B13309906cd37B,0xBFc7CAE0Fad9B346270Ae8fde24827D2D779eF07,0x69d95FfCeCe36DC3f2e9f5e42EB270a0BcD98665,0x2fD39e6741b1446C51e8A120aB1D69F645e10e0E,0x149986E1b481D9E026A3C4F472C0B86A7D5DF08D
Arg [1] : _amounts (uint256[]): 133700000000000020,133800000000000000,133700200000000000,133700200000000000,133700200000000000,133700200000000000,133700000000000000,133700200000000000,133700000000000000,133700000000000000

-----Encoded View---------------
24 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [3] : 000000000000000000000000b010ca9be09c382a9f31b79493bb232bcc319f01
Arg [4] : 00000000000000000000000009e08a6c3015fa2c0dbaff4ee2eb659efd9fe31c
Arg [5] : 000000000000000000000000b0ccf43ada6cbaa26dcf4907117b496d49f74242
Arg [6] : 0000000000000000000000008913b99d5efd9e391ade59168230f6425813d90a
Arg [7] : 0000000000000000000000001a50a6238eb67285ccd4df17f75cce430baae2a4
Arg [8] : 000000000000000000000000a4ca1b15fe81f57cb2d3f686c7b13309906cd37b
Arg [9] : 000000000000000000000000bfc7cae0fad9b346270ae8fde24827d2d779ef07
Arg [10] : 00000000000000000000000069d95ffcece36dc3f2e9f5e42eb270a0bcd98665
Arg [11] : 0000000000000000000000002fd39e6741b1446c51e8a120ab1d69f645e10e0e
Arg [12] : 000000000000000000000000149986e1b481d9e026a3c4f472c0b86a7d5df08d
Arg [13] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [14] : 00000000000000000000000000000000000000000000000001daff710e784014
Arg [15] : 00000000000000000000000000000000000000000000000001db5a641ef28000
Arg [16] : 00000000000000000000000000000000000000000000000001daff9f9f661000
Arg [17] : 00000000000000000000000000000000000000000000000001daff9f9f661000
Arg [18] : 00000000000000000000000000000000000000000000000001daff9f9f661000
Arg [19] : 00000000000000000000000000000000000000000000000001daff9f9f661000
Arg [20] : 00000000000000000000000000000000000000000000000001daff710e784000
Arg [21] : 00000000000000000000000000000000000000000000000001daff9f9f661000
Arg [22] : 00000000000000000000000000000000000000000000000001daff710e784000
Arg [23] : 00000000000000000000000000000000000000000000000001daff710e784000

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.

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