ETH Price: $2,483.51 (+2.76%)

Token

XEN Torrent (opXENT)

Overview

Max Total Supply

0 opXENT

Holders

7,737

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A
Balance
15 opXENT
0xa4e96146aef74472f7459acd087d622992611207
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Contract Source Code Verified (Exact Match)

Contract Name:
XENTorrent

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
Yes with 20 runs

Other Settings:
london EvmVersion
File 1 of 38 : XENFT.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/interfaces/IERC2981.sol";
import "@openzeppelin/contracts/utils/Base64.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@faircrypto/xen-crypto/contracts/XENCrypto.sol";
import "@faircrypto/xen-crypto/contracts/interfaces/IBurnableToken.sol";
import "@faircrypto/xen-crypto/contracts/interfaces/IBurnRedeemable.sol";
import "operator-filter-registry/src/DefaultOperatorFilterer.sol";
import "./libs/ERC2771Context.sol";
import "./interfaces/IERC2771.sol";
import "./interfaces/IXENTorrent.sol";
import "./interfaces/IXENProxying.sol";
import "./libs/MintInfo.sol";
import "./libs/Metadata.sol";
import "./libs/Array.sol";

/*

        \\      //   |||||||||||   |\      ||       A CRYPTOCURRENCY FOR THE MASSES
         \\    //    ||            |\\     ||
          \\  //     ||            ||\\    ||       PRINCIPLES OF XEN:
           \\//      ||            || \\   ||       - No pre-mint; starts with zero supply
            XX       ||||||||      ||  \\  ||       - No admin keys
           //\\      ||            ||   \\ ||       - Immutable contract
          //  \\     ||            ||    \\||
         //    \\    ||            ||     \\|
        //      \\   |||||||||||   ||      \|       Copyright (C) FairCrypto Foundation 2022


    XENFT XEN Torrent props:
    - count: number of VMUs
    - mintInfo: (term, maturityTs, cRank start, AMP,  EAA, apex, limited, group, redeemed)
 */
contract XENTorrent is
    DefaultOperatorFilterer, // required to support OpenSea royalties
    IXENTorrent,
    IXENProxying,
    IBurnableToken,
    IBurnRedeemable,
    ERC2771Context, // required to support meta transactions
    IERC2981, // required to support NFT royalties
    ERC721("XEN Torrent", "opXENT")
{
    // HELPER LIBRARIES

    using Strings for uint256;
    using MintInfo for uint256;
    using Array for uint256[];

    // PUBLIC CONSTANTS

    // XENFT common business logic
    uint256 public constant BLACKOUT_TERM = 7 * 24 * 3600; /* 7 days in sec */

    // XENFT categories' params
    uint256 public constant COMMON_CATEGORY_COUNTER = 10_001;
    uint256 public constant SPECIAL_CATEGORIES_VMU_THRESHOLD = 99;
    uint256 public constant LIMITED_CATEGORY_TIME_THRESHOLD = 3_600 * 24 * 365;

    uint256 public constant POWER_GROUP_SIZE = 7_500;

    string public constant AUTHORS = "@MrJackLevin @lbelyaev faircrypto.org";

    uint256 public constant ROYALTY_BP = 500;

    // PUBLIC MUTABLE STATE

    // increasing counters for NFT tokenIds, also used as salt for proxies' spinning
    uint256 public tokenIdCounter = COMMON_CATEGORY_COUNTER;

    // Indexing of params by categories and classes:
    // 0: Collector
    // 1: Limited
    // 2: Rare
    // 3: Epic
    // 4: Legendary
    // 5: Exotic
    // 6: Xunicorn
    // [0, B1, B2, B3, B4, B5, B6]
    uint256[] public specialClassesBurnRates;
    // [0, 0, R1, R2, R3, R4, R5]
    uint256[] public specialClassesTokenLimits;
    // [0, 0, 0 + 1, R1+1, R2+1, R3+1, R4+1]
    uint256[] public specialClassesCounters;

    // mapping: NFT tokenId => count of Virtual Mining Units
    mapping(uint256 => uint256) public vmuCount;
    // mapping: NFT tokenId => burned XEN
    mapping(uint256 => uint256) public xenBurned;
    // mapping: NFT tokenId => MintInfo (used in tokenURI generation)
    // MintInfo encoded as:
    //      term (uint16)
    //      | maturityTs (uint64)
    //      | rank (uint128)
    //      | amp (uint16)
    //      | eaa (uint16)
    //      | class (uint8):
    //          [7] isApex
    //          [6] isLimited
    //          [0-5] powerGroupIdx
    //      | redeemed (uint8)
    mapping(uint256 => uint256) public mintInfo;

    // PUBLIC IMMUTABLE STATE

    // pointer to XEN Crypto contract
    XENCrypto public immutable xenCrypto;
    // genesisTs for the contract
    uint256 public immutable genesisTs;
    // start of operations block number
    uint256 public immutable startBlockNumber;

    // PRIVATE STATE

    // original contract marking to distinguish from proxy copies
    address private immutable _original;
    // original deployer address to be used for setting trusted forwarder
    address private immutable _deployer;
    // address to be used for royalties' tracking
    address private immutable _royaltyReceiver;

    // reentrancy guard constants and state
    // using non-zero constants to save gas avoiding repeated initialization
    uint256 private constant _NOT_USED = 2**256 - 1; // 0xFF..FF
    uint256 private constant _USED = _NOT_USED - 1; // 0xFF..FE
    // used as both
    // - reentrancy guard (_NOT_USED > _USED > _NOT_USED)
    // - for keeping state while awaiting for OnTokenBurned callback (_NOT_USED > tokenId > _NOT_USED)
    uint256 private _tokenId;

    // mapping Address => tokenId[]
    mapping(address => uint256[]) private _ownedTokens;

    /**
        @dev    Constructor. Creates XEN Torrent contract, setting immutable parameters
     */
    constructor(
        address xenCrypto_,
        uint256[] memory burnRates_,
        uint256[] memory tokenLimits_,
        uint256 startBlockNumber_,
        address forwarder_,
        address royaltyReceiver_
    ) ERC2771Context(forwarder_) {
        require(xenCrypto_ != address(0), "bad address");
        require(burnRates_.length == tokenLimits_.length && burnRates_.length > 0, "params mismatch");
        _tokenId = _NOT_USED;
        _original = address(this);
        _deployer = msg.sender;
        _royaltyReceiver = royaltyReceiver_ == address(0) ? msg.sender : royaltyReceiver_;
        startBlockNumber = startBlockNumber_;
        genesisTs = block.timestamp;
        xenCrypto = XENCrypto(xenCrypto_);
        specialClassesBurnRates = burnRates_;
        specialClassesTokenLimits = tokenLimits_;
        specialClassesCounters = new uint256[](tokenLimits_.length);
        for (uint256 i = 2; i < specialClassesBurnRates.length - 1; i++) {
            specialClassesCounters[i] = specialClassesTokenLimits[i + 1] + 1;
        }
        specialClassesCounters[specialClassesBurnRates.length - 1] = 1;
    }

    /**
        @dev    Call Reentrancy Guard
    */
    modifier nonReentrant() {
        require(_tokenId == _NOT_USED, "XENFT: Reentrancy detected");
        _tokenId = _USED;
        _;
        _tokenId = _NOT_USED;
    }

    /**
        @dev    Start of Operations Guard
    */
    modifier notBeforeStart() {
        require(block.number > startBlockNumber, "XENFT: Not active yet");
        _;
    }

    // INTERFACES & STANDARDS
    // IERC165 IMPLEMENTATION

    /**
        @dev confirms support for IERC-165, IERC-721, IERC2981, IERC2771 and IBurnRedeemable interfaces
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return
            interfaceId == type(IBurnRedeemable).interfaceId ||
            interfaceId == type(IERC2981).interfaceId ||
            interfaceId == type(IERC2771).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    // ERC2771 IMPLEMENTATION

    /**
        @dev use ERC2771Context implementation of _msgSender()
     */
    function _msgSender() internal view virtual override(Context, ERC2771Context) returns (address) {
        return ERC2771Context._msgSender();
    }

    /**
        @dev use ERC2771Context implementation of _msgData()
     */
    function _msgData() internal view virtual override(Context, ERC2771Context) returns (bytes calldata) {
        return ERC2771Context._msgData();
    }

    // OWNABLE IMPLEMENTATION

    /**
        @dev public getter to check for deployer / owner (Opensea, etc.)
     */
    function owner() external view returns (address) {
        return _deployer;
    }

    // ERC-721 METADATA IMPLEMENTATION
    /**
        @dev compliance with ERC-721 standard (NFT); returns NFT metadata, including SVG-encoded image
     */
    function tokenURI(uint256 tokenId) public view override returns (string memory) {
        uint256 count = vmuCount[tokenId];
        uint256 info = mintInfo[tokenId];
        uint256 burned = xenBurned[tokenId];
        require(count > 0);
        bytes memory dataURI = abi.encodePacked(
            "{",
            '"name": "XEN Torrent #',
            tokenId.toString(),
            '",',
            '"description": "XENFT: XEN Crypto Minting Torrent",',
            '"image": "',
            "data:image/svg+xml;base64,",
            Base64.encode(Metadata.svgData(tokenId, count, info, address(xenCrypto), burned)),
            '",',
            '"attributes": ',
            Metadata.attributes(count, burned, info),
            "}"
        );
        return string(abi.encodePacked("data:application/json;base64,", Base64.encode(dataURI)));
    }

    // IMPLEMENTATION OF XENProxying INTERFACE
    // FUNCTIONS IN PROXY COPY CONTRACTS (VMUs), CALLING ORIGINAL XEN CRYPTO CONTRACT
    /**
        @dev function callable only in proxy contracts from the original one => XENCrypto.claimRank(term)
     */
    function callClaimRank(uint256 term) external {
        require(msg.sender == _original, "XEN Proxy: unauthorized");
        bytes memory callData = abi.encodeWithSignature("claimRank(uint256)", term);
        (bool success, ) = address(xenCrypto).call(callData);
        require(success, "call failed");
    }

    /**
        @dev function callable only in proxy contracts from the original one => XENCrypto.claimMintRewardAndShare()
     */
    function callClaimMintReward(address to) external {
        require(msg.sender == _original, "XEN Proxy: unauthorized");
        bytes memory callData = abi.encodeWithSignature("claimMintRewardAndShare(address,uint256)", to, uint256(100));
        (bool success, ) = address(xenCrypto).call(callData);
        require(success, "call failed");
    }

    /**
        @dev function callable only in proxy contracts from the original one => destroys the proxy contract
     */
    function powerDown() external {
        require(msg.sender == _original, "XEN Proxy: unauthorized");
        selfdestruct(payable(address(0)));
    }

    // OVERRIDING OF ERC-721 IMPLEMENTATION
    // ENFORCEMENT OF TRANSFER BLACKOUT PERIOD

    /**
        @dev overrides OZ ERC-721 before transfer hook to check if there's no blackout period
     */
    function _beforeTokenTransfer(
        address from,
        address,
        uint256 tokenId
    ) internal virtual override {
        if (from != address(0)) {
            uint256 maturityTs = mintInfo[tokenId].getMaturityTs();
            uint256 delta = maturityTs > block.timestamp ? maturityTs - block.timestamp : block.timestamp - maturityTs;
            require(delta > BLACKOUT_TERM, "XENFT: transfer prohibited in blackout period");
        }
    }

    /**
        @dev overrides OZ ERC-721 after transfer hook to allow token enumeration for owner
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        _ownedTokens[from].removeItem(tokenId);
        _ownedTokens[to].addItem(tokenId);
    }

    // IBurnRedeemable IMPLEMENTATION

    /**
        @dev implements IBurnRedeemable interface for burning XEN and completing Bulk Mint for limited series
     */
    function onTokenBurned(address user, uint256 burned) external {
        require(_tokenId != _NOT_USED, "XENFT: illegal callback state");
        require(msg.sender == address(xenCrypto), "XENFT: illegal callback caller");
        _ownedTokens[user].addItem(_tokenId);
        xenBurned[_tokenId] = burned;
        _safeMint(user, _tokenId);
        emit StartTorrent(user, vmuCount[_tokenId], mintInfo[_tokenId].getTerm());
        _tokenId = _NOT_USED;
    }

    // IBurnableToken IMPLEMENTATION

    /**
        @dev burns XENTorrent XENFT which can be used by connected contracts services
     */
    function burn(address user, uint256 tokenId) public notBeforeStart nonReentrant {
        require(
            IERC165(_msgSender()).supportsInterface(type(IBurnRedeemable).interfaceId),
            "XENFT burn: not a supported contract"
        );
        require(user != address(0), "XENFT burn: illegal owner address");
        require(tokenId > 0, "XENFT burn: illegal tokenId");
        require(_isApprovedOrOwner(_msgSender(), tokenId), "XENFT burn: not an approved operator");
        require(ownerOf(tokenId) == user, "XENFT burn: user is not tokenId owner");
        _ownedTokens[user].removeItem(tokenId);
        _burn(tokenId);
        IBurnRedeemable(_msgSender()).onTokenBurned(user, tokenId);
    }

    // OVERRIDING ERC-721 IMPLEMENTATION TO ALLOW OPENSEA ROYALTIES ENFORCEMENT PROTOCOL

    /**
        @dev implements `setApprovalForAll` with additional approved Operator checking
     */
    function setApprovalForAll(address operator, bool approved) public override onlyAllowedOperatorApproval(operator) {
        super.setApprovalForAll(operator, approved);
    }

    /**
        @dev implements `approve` with additional approved Operator checking
     */
    function approve(address operator, uint256 tokenId) public override onlyAllowedOperatorApproval(operator) {
        super.approve(operator, tokenId);
    }

    /**
        @dev implements `transferFrom` with additional approved Operator checking
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public override onlyAllowedOperator(from) {
        super.transferFrom(from, to, tokenId);
    }

    /**
        @dev implements `safeTransferFrom` with additional approved Operator checking
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public override onlyAllowedOperator(from) {
        super.safeTransferFrom(from, to, tokenId);
    }

    /**
        @dev implements `safeTransferFrom` with additional approved Operator checking
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public override onlyAllowedOperator(from) {
        super.safeTransferFrom(from, to, tokenId, data);
    }

    // SUPPORT FOR ERC2771 META-TRANSACTIONS

    /**
        @dev Implements setting a `Trusted Forwarder` for meta-txs. Settable only once
     */
    function addForwarder(address trustedForwarder) external {
        require(msg.sender == _deployer, "XENFT: not an deployer");
        require(_trustedForwarder == address(0), "XENFT: Forwarder is already set");
        _trustedForwarder = trustedForwarder;
    }

    // SUPPORT FOR ERC2981 ROYALTY INFO

    /**
        @dev Implements getting Royalty Info by supported operators. ROYALTY_BP is expressed in basis points
     */
    function royaltyInfo(uint256, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount) {
        receiver = _royaltyReceiver;
        royaltyAmount = (salePrice * ROYALTY_BP) / 10_000;
    }

    // XEN TORRENT PRIVATE / INTERNAL HELPERS

    /**
        @dev Sets specified XENFT as redeemed
     */
    function _setRedeemed(uint256 tokenId) private {
        mintInfo[tokenId] = mintInfo[tokenId] | uint256(1);
    }

    /**
        @dev Determines power group index for Collector Category
     */
    function _powerGroup(uint256 vmus, uint256 term) private pure returns (uint256) {
        return (vmus * term) / POWER_GROUP_SIZE;
    }

    /**
        @dev calculates Collector Class index
    */
    function _classIdx(uint256 count, uint256 term) private pure returns (uint256 index) {
        if (_powerGroup(count, term) > 7) return 7;
        return _powerGroup(count, term);
    }

    /**
        @dev internal helper to determine special class tier based on XEN to be burned
     */
    function _specialTier(uint256 burning) private view returns (uint256) {
        for (uint256 i = specialClassesBurnRates.length - 1; i > 0; i--) {
            if (specialClassesBurnRates[i] == 0) {
                return 0;
            }
            if (burning > specialClassesBurnRates[i] - 1) {
                return i;
            }
        }
        return 0;
    }

    /**
        @dev internal helper to collect params and encode MintInfo
     */
    function _mintInfo(
        address proxy,
        uint256 count,
        uint256 term,
        uint256 burning,
        uint256 tokenId
    ) private view returns (uint256) {
        bool apex = isApex(tokenId);
        uint256 _class = _classIdx(count, term);
        if (apex) _class = uint8(7 + _specialTier(burning)) | 0x80; // Apex Class
        if (burning > 0 && !apex) _class = uint8(8) | 0x40; // Limited Class
        (, , uint256 maturityTs, uint256 rank, uint256 amp, uint256 eaa) = xenCrypto.userMints(proxy);
        return MintInfo.encodeMintInfo(term, maturityTs, rank, amp, eaa, _class, false);
    }

    /**
        @dev internal torrent interface. initiates Bulk Mint (Torrent) Operation
     */
    function _bulkClaimRank(
        uint256 count,
        uint256 term,
        uint256 tokenId,
        uint256 burning
    ) private {
        bytes memory bytecode = bytes.concat(
            bytes20(0x3D602d80600A3D3981F3363d3d373d3D3D363d73),
            bytes20(address(this)),
            bytes15(0x5af43d82803e903d91602b57fd5bf3)
        );
        bytes memory callData = abi.encodeWithSignature("callClaimRank(uint256)", term);
        address proxy;
        bool succeeded;
        for (uint256 i = 1; i < count + 1; i++) {
            bytes32 salt = keccak256(abi.encodePacked(i, tokenId));
            assembly {
                proxy := create2(0, add(bytecode, 0x20), mload(bytecode), salt)
                succeeded := call(gas(), proxy, 0, add(callData, 0x20), mload(callData), 0, 0)
            }
            require(succeeded, "XENFT: Error while claiming rank");
            if (i == 1) {
                mintInfo[tokenId] = _mintInfo(proxy, count, term, burning, tokenId);
            }
        }
        vmuCount[tokenId] = count;
    }

    /**
        @dev internal helper to claim tokenId (limited / ordinary)
     */
    function _getTokenId(uint256 count, uint256 burning) private returns (uint256) {
        // burn possibility has already been verified
        uint256 tier = _specialTier(burning);
        if (tier == 1) {
            require(count > SPECIAL_CATEGORIES_VMU_THRESHOLD, "XENFT: under req VMU count");
            require(block.timestamp < genesisTs + LIMITED_CATEGORY_TIME_THRESHOLD, "XENFT: limited time expired");
            return tokenIdCounter++;
        }
        if (tier > 1) {
            require(_msgSender() == tx.origin, "XENFT: only EOA allowed for this category");
            require(count > SPECIAL_CATEGORIES_VMU_THRESHOLD, "XENFT: under req VMU count");
            require(specialClassesCounters[tier] < specialClassesTokenLimits[tier] + 1, "XENFT: class sold out");
            return specialClassesCounters[tier]++;
        }
        return tokenIdCounter++;
    }

    // PUBLIC GETTERS

    /**
        @dev public getter for tokens owned by address
     */
    function ownedTokens() external view returns (uint256[] memory) {
        return _ownedTokens[_msgSender()];
    }

    /**
        @dev determines if tokenId corresponds to Limited Category
     */
    function isApex(uint256 tokenId) public pure returns (bool apex) {
        apex = tokenId < COMMON_CATEGORY_COUNTER;
    }

    // PUBLIC TRANSACTIONAL INTERFACE

    /**
        @dev    public XEN Torrent interface
                initiates Bulk Mint (Torrent) Operation (Common Category)
     */
    function bulkClaimRank(uint256 count, uint256 term) public notBeforeStart returns (uint256 tokenId) {
        require(_tokenId == _NOT_USED, "XENFT: reentrancy detected");
        require(count > 0, "XENFT: Illegal count");
        require(term > 0, "XENFT: Illegal term");
        _tokenId = _getTokenId(count, 0);
        _bulkClaimRank(count, term, _tokenId, 0);
        _ownedTokens[_msgSender()].addItem(_tokenId);
        _safeMint(_msgSender(), _tokenId);
        emit StartTorrent(_msgSender(), count, term);
        tokenId = _tokenId;
        _tokenId = _NOT_USED;
    }

    /**
        @dev public torrent interface. initiates Bulk Mint (Torrent) Operation (Special Category)
     */
    function bulkClaimRankLimited(
        uint256 count,
        uint256 term,
        uint256 burning
    ) public notBeforeStart returns (uint256) {
        require(_tokenId == _NOT_USED, "XENFT: reentrancy detected");
        require(count > 0, "XENFT: Illegal count");
        require(term > 0, "XENFT: Illegal term");
        require(burning > specialClassesBurnRates[1] - 1, "XENFT: not enough burn amount");
        uint256 balance = IERC20(xenCrypto).balanceOf(_msgSender());
        require(balance > burning - 1, "XENFT: not enough XEN balance");
        uint256 approved = IERC20(xenCrypto).allowance(_msgSender(), address(this));
        require(approved > burning - 1, "XENFT: not enough XEN balance approved for burn");
        _tokenId = _getTokenId(count, burning);
        _bulkClaimRank(count, term, _tokenId, burning);
        IBurnableToken(xenCrypto).burn(_msgSender(), burning);
        return _tokenId;
    }

    /**
        @dev public torrent interface. initiates Mint Reward claim and collection and terminates Torrent Operation
     */
    function bulkClaimMintReward(uint256 tokenId, address to) external notBeforeStart nonReentrant {
        require(ownerOf(tokenId) == _msgSender(), "XENFT: Incorrect owner");
        require(to != address(0), "XENFT: Illegal address");
        require(!mintInfo[tokenId].getRedeemed(), "XENFT: Already redeemed");
        bytes memory bytecode = bytes.concat(
            bytes20(0x3D602d80600A3D3981F3363d3d373d3D3D363d73),
            bytes20(address(this)),
            bytes15(0x5af43d82803e903d91602b57fd5bf3)
        );
        uint256 end = vmuCount[tokenId] + 1;
        bytes memory callData = abi.encodeWithSignature("callClaimMintReward(address)", to);
        bytes memory callData1 = abi.encodeWithSignature("powerDown()");
        for (uint256 i = 1; i < end; i++) {
            bytes32 salt = keccak256(abi.encodePacked(i, tokenId));
            bool succeeded;
            bytes32 hash = keccak256(abi.encodePacked(hex"ff", address(this), salt, keccak256(bytecode)));
            address proxy = address(uint160(uint256(hash)));
            assembly {
                succeeded := call(gas(), proxy, 0, add(callData, 0x20), mload(callData), 0, 0)
            }
            require(succeeded, "XENFT: Error while claiming rewards");
            assembly {
                succeeded := call(gas(), proxy, 0, add(callData1, 0x20), mload(callData1), 0, 0)
            }
            require(succeeded, "XENFT: Error while powering down");
        }
        _setRedeemed(tokenId);
        emit EndTorrent(_msgSender(), tokenId, to);
    }
}

File 2 of 38 : StringData.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

/*
    Extra XEN quotes:

    "When you realize nothing is lacking, the whole world belongs to you." - Lao Tzu
    "Each morning, we are born again. What we do today is what matters most." - Buddha
    "If you are depressed, you are living in the past." - Lao Tzu
    "In true dialogue, both sides are willing to change." - Thich Nhat Hanh
    "The spirit of the individual is determined by his domination thought habits." - Bruce Lee
    "Be the path. Do not seek it." - Yara Tschallener
    "Bow to no one but your own divinity." - Satya
    "With insight there is hope for awareness, and with awareness there can be change." - Tom Kenyon
    "The opposite of depression isn't happiness, it is purpose." - Derek Sivers
    "If you can't, you must." - Tony Robbins
    “When you are grateful, fear disappears and abundance appears.” - Lao Tzu
    “It is in your moments of decision that your destiny is shaped.” - Tony Robbins
    "Surmounting difficulty is the crucible that forms character." - Tony Robbins
    "Three things cannot be long hidden: the sun, the moon, and the truth." - Buddha
    "What you are is what you have been. What you’ll be is what you do now." - Buddha
    "The best way to take care of our future is to take care of the present moment." - Thich Nhat Hanh
*/

/**
   @dev  a library to supply a XEN string data based on params
*/
library StringData {
    uint256 public constant QUOTES_COUNT = 12;
    uint256 public constant QUOTE_LENGTH = 66;
    bytes public constant QUOTES =
        bytes(
            '"If you realize you have enough, you are truly rich." - Lao Tzu   '
            '"The real meditation is how you live your life." - Jon Kabat-Zinn '
            '"To know that you do not know is the best." - Lao Tzu             '
            '"An over-sharpened sword cannot last long." - Lao Tzu             '
            '"When you accept yourself, the whole world accepts you." - Lao Tzu'
            '"Music in the soul can be heard by the universe." - Lao Tzu       '
            '"As soon as you have made a thought, laugh at it." - Lao Tzu      '
            '"The further one goes, the less one knows." - Lao Tzu             '
            '"Stop thinking, and end your problems." - Lao Tzu                 '
            '"Reliability is the foundation of commitment." - Unknown          '
            '"Your past does not equal your future." - Tony Robbins            '
            '"Be the path. Do not seek it." - Yara Tschallener                 '
        );
    uint256 public constant CLASSES_COUNT = 14;
    uint256 public constant CLASSES_NAME_LENGTH = 10;
    bytes public constant CLASSES =
        bytes(
            "Ruby      "
            "Opal      "
            "Topaz     "
            "Emerald   "
            "Aquamarine"
            "Sapphire  "
            "Amethyst  "
            "Xenturion "
            "Limited   "
            "Rare      "
            "Epic      "
            "Legendary "
            "Exotic    "
            "Xunicorn  "
        );

    /**
        @dev    Solidity doesn't yet support slicing of byte arrays anywhere outside of calldata,
                therefore we make a hack by supplying our local constant packed string array as calldata
    */
    function getQuote(bytes calldata quotes, uint256 index) external pure returns (string memory) {
        if (index > QUOTES_COUNT - 1) return string(quotes[0:QUOTE_LENGTH]);
        return string(quotes[index * QUOTE_LENGTH:(index + 1) * QUOTE_LENGTH]);
    }

    function getClassName(bytes calldata names, uint256 index) external pure returns (string memory) {
        if (index < CLASSES_COUNT) return string(names[index * CLASSES_NAME_LENGTH:(index + 1) * CLASSES_NAME_LENGTH]);
        return "";
    }
}

File 3 of 38 : SVG.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts/utils/Strings.sol";
import "./DateTime.sol";
import "./StringData.sol";
import "./FormattedStrings.sol";

/*
    @dev        Library to create SVG image for XENFT metadata
    @dependency depends on DataTime.sol and StringData.sol libraries
 */
library SVG {
    // Type to encode all data params for SVG image generation
    struct SvgParams {
        string symbol;
        address xenAddress;
        uint256 tokenId;
        uint256 term;
        uint256 rank;
        uint256 count;
        uint256 maturityTs;
        uint256 amp;
        uint256 eaa;
        uint256 xenBurned;
        bool redeemed;
        string series;
    }

    // Type to encode SVG gradient stop color on HSL color scale
    struct Color {
        uint256 h;
        uint256 s;
        uint256 l;
        uint256 a;
        uint256 off;
    }

    // Type to encode SVG gradient
    struct Gradient {
        Color[] colors;
        uint256 id;
        uint256[4] coords;
    }

    using DateTime for uint256;
    using Strings for uint256;
    using FormattedStrings for uint256;
    using Strings for address;

    string private constant _STYLE =
        "<style> "
        ".base {fill: #ededed;font-family:Montserrat,arial,sans-serif;font-size:30px;font-weight:400;} "
        ".series {text-transform: uppercase} "
        ".logo {font-size:200px;font-weight:100;} "
        ".meta {font-size:12px;} "
        ".small {font-size:8px;} "
        ".burn {font-weight:500;font-size:16px;} }"
        "</style>";

    string private constant _COLLECTOR =
        "<g>"
        "<path "
        'stroke="#ededed" '
        'fill="none" '
        'transform="translate(265,418)" '
        'd="m 0 0 L -20 -30 L -12.5 -38.5 l 6.5 7 L 0 -38.5 L 6.56 -31.32 L 12.5 -38.5 L 20 -30 L 0 0 L -7.345 -29.955 L 0 -38.5 L 7.67 -30.04 L 0 0 Z M 0 0 L -20.055 -29.955 l 7.555 -8.545 l 24.965 -0.015 L 20 -30 L -20.055 -29.955"/>'
        "</g>";

    string private constant _LIMITED =
        "<g> "
        '<path fill="#ededed" '
        'transform="scale(0.4) translate(600, 940)" '
        'd="M66,38.09q.06.9.18,1.71v.05c1,7.08,4.63,11.39,9.59,13.81,5.18,2.53,11.83,3.09,18.48,2.61,1.49-.11,3-.27,4.39-.47l1.59-.2c4.78-.61,11.47-1.48,13.35-5.06,1.16-2.2,1-5,0-8a38.85,38.85,0,0,0-6.89-11.73A32.24,32.24,0,0,0,95,21.46,21.2,21.2,0,0,0,82.3,20a23.53,23.53,0,0,0-12.75,7,15.66,15.66,0,0,0-2.35,3.46h0a20.83,20.83,0,0,0-1,2.83l-.06.2,0,.12A12,12,0,0,0,66,37.9l0,.19Zm26.9-3.63a5.51,5.51,0,0,1,2.53-4.39,14.19,14.19,0,0,0-5.77-.59h-.16l.06.51a5.57,5.57,0,0,0,2.89,4.22,4.92,4.92,0,0,0,.45.24ZM88.62,28l.94-.09a13.8,13.8,0,0,1,8,1.43,7.88,7.88,0,0,1,3.92,6.19l0,.43a.78.78,0,0,1-.66.84A19.23,19.23,0,0,1,98,37a12.92,12.92,0,0,1-6.31-1.44A7.08,7.08,0,0,1,88,30.23a10.85,10.85,0,0,1-.1-1.44.8.8,0,0,1,.69-.78ZM14.15,10c-.06-5.86,3.44-8.49,8-9.49C26.26-.44,31.24.16,34.73.7A111.14,111.14,0,0,1,56.55,6.4a130.26,130.26,0,0,1,22,10.8,26.25,26.25,0,0,1,3-.78,24.72,24.72,0,0,1,14.83,1.69,36,36,0,0,1,13.09,10.42,42.42,42.42,0,0,1,7.54,12.92c1.25,3.81,1.45,7.6-.23,10.79-2.77,5.25-10.56,6.27-16.12,7l-1.23.16a54.53,54.53,0,0,1-2.81,12.06A108.62,108.62,0,0,1,91.3,84v25.29a9.67,9.67,0,0,1,9.25,10.49c0,.41,0,.81,0,1.18a1.84,1.84,0,0,1-1.84,1.81H86.12a8.8,8.8,0,0,1-5.1-1.56,10.82,10.82,0,0,1-3.35-4,2.13,2.13,0,0,1-.2-.46L73.53,103q-2.73,2.13-5.76,4.16c-1.2.8-2.43,1.59-3.69,2.35l.6.16a8.28,8.28,0,0,1,5.07,4,15.38,15.38,0,0,1,1.71,7.11V121a1.83,1.83,0,0,1-1.83,1.83h-53c-2.58.09-4.47-.52-5.75-1.73A6.49,6.49,0,0,1,9.11,116v-11.2a42.61,42.61,0,0,1-6.34-11A38.79,38.79,0,0,1,1.11,70.29,37,37,0,0,1,13.6,50.54l.1-.09a41.08,41.08,0,0,1,11-6.38c7.39-2.9,17.93-2.77,26-2.68,5.21.06,9.34.11,10.19-.49a4.8,4.8,0,0,0,1-.91,5.11,5.11,0,0,0,.56-.84c0-.26,0-.52-.07-.78a16,16,0,0,1-.06-4.2,98.51,98.51,0,0,0-18.76-3.68c-7.48-.83-15.44-1.19-23.47-1.41l-1.35,0c-2.59,0-4.86,0-7.46-1.67A9,9,0,0,1,8,23.68a9.67,9.67,0,0,1-.91-5A10.91,10.91,0,0,1,8.49,14a8.74,8.74,0,0,1,3.37-3.29A8.2,8.2,0,0,1,14.15,10ZM69.14,22a54.75,54.75,0,0,1,4.94-3.24,124.88,124.88,0,0,0-18.8-9A106.89,106.89,0,0,0,34.17,4.31C31,3.81,26.44,3.25,22.89,4c-2.55.56-4.59,1.92-5,4.79a134.49,134.49,0,0,1,26.3,3.8,115.69,115.69,0,0,1,25,9.4ZM64,28.65c.21-.44.42-.86.66-1.28a15.26,15.26,0,0,1,1.73-2.47,146.24,146.24,0,0,0-14.92-6.2,97.69,97.69,0,0,0-15.34-4A123.57,123.57,0,0,0,21.07,13.2c-3.39-.08-6.3.08-7.47.72a5.21,5.21,0,0,0-2,1.94,7.3,7.3,0,0,0-1,3.12,6.1,6.1,0,0,0,.55,3.11,5.43,5.43,0,0,0,2,2.21c1.73,1.09,3.5,1.1,5.51,1.12h1.43c8.16.23,16.23.59,23.78,1.42a103.41,103.41,0,0,1,19.22,3.76,17.84,17.84,0,0,1,.85-2Zm-.76,15.06-.21.16c-1.82,1.3-6.48,1.24-12.35,1.17C42.91,45,32.79,44.83,26,47.47a37.41,37.41,0,0,0-10,5.81l-.1.08A33.44,33.44,0,0,0,4.66,71.17a35.14,35.14,0,0,0,1.5,21.32A39.47,39.47,0,0,0,12.35,103a1.82,1.82,0,0,1,.42,1.16v12a3.05,3.05,0,0,0,.68,2.37,4.28,4.28,0,0,0,3.16.73H67.68a10,10,0,0,0-1.11-3.69,4.7,4.7,0,0,0-2.87-2.32,15.08,15.08,0,0,0-4.4-.38h-26a1.83,1.83,0,0,1-.15-3.65c5.73-.72,10.35-2.74,13.57-6.25,3.06-3.34,4.91-8.1,5.33-14.45v-.13A18.88,18.88,0,0,0,46.35,75a20.22,20.22,0,0,0-7.41-4.42,23.54,23.54,0,0,0-8.52-1.25c-4.7.19-9.11,1.83-12,4.83a1.83,1.83,0,0,1-2.65-2.52c3.53-3.71,8.86-5.73,14.47-6a27.05,27.05,0,0,1,9.85,1.44,24,24,0,0,1,8.74,5.23,22.48,22.48,0,0,1,6.85,15.82v.08a2.17,2.17,0,0,1,0,.36c-.47,7.25-2.66,12.77-6.3,16.75a21.24,21.24,0,0,1-4.62,3.77H57.35q4.44-2.39,8.39-5c2.68-1.79,5.22-3.69,7.63-5.67a1.82,1.82,0,0,1,2.57.24,1.69,1.69,0,0,1,.35.66L81,115.62a7,7,0,0,0,2.16,2.62,5.06,5.06,0,0,0,3,.9H96.88a6.56,6.56,0,0,0-1.68-4.38,7.19,7.19,0,0,0-4.74-1.83c-.36,0-.69,0-1,0a1.83,1.83,0,0,1-1.83-1.83V83.6a1.75,1.75,0,0,1,.23-.88,105.11,105.11,0,0,0,5.34-12.46,52,52,0,0,0,2.55-10.44l-1.23.1c-7.23.52-14.52-.12-20.34-3A20,20,0,0,1,63.26,43.71Z"/>'
        "</g>";

    string private constant _APEX =
        '<g transform="scale(0.5) translate(533, 790)">'
        '<circle r="39" stroke="#ededed" fill="transparent"/>'
        '<path fill="#ededed" '
        'd="M0,38 a38,38 0 0 1 0,-76 a19,19 0 0 1 0,38 a19,19 0 0 0 0,38 z m -5 -57 a 5,5 0 1,0 10,0 a 5,5 0 1,0 -10,0 z" '
        'fill-rule="evenodd"/>'
        '<path fill="#ededed" '
        'd="m -5, 19 a 5,5 0 1,0 10,0 a 5,5 0 1,0 -10,0"/>'
        "</g>";

    string private constant _LOGO =
        '<path fill="#ededed" '
        'd="M122.7,227.1 l-4.8,0l55.8,-74l0,3.2l-51.8,-69.2l5,0l48.8,65.4l-1.2,0l48.8,-65.4l4.8,0l-51.2,68.4l0,-1.6l55.2,73.2l-5,0l-52.8,-70.2l1.2,0l-52.8,70.2z" '
        'vector-effect="non-scaling-stroke" />';

    /**
        @dev internal helper to create HSL-encoded color prop for SVG tags
     */
    function colorHSL(Color memory c) internal pure returns (bytes memory) {
        return abi.encodePacked("hsl(", c.h.toString(), ", ", c.s.toString(), "%, ", c.l.toString(), "%)");
    }

    /**
        @dev internal helper to create `stop` SVG tag
     */
    function colorStop(Color memory c) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                '<stop stop-color="',
                colorHSL(c),
                '" stop-opacity="',
                c.a.toString(),
                '" offset="',
                c.off.toString(),
                '%"/>'
            );
    }

    /**
        @dev internal helper to encode position for `Gradient` SVG tag
     */
    function pos(uint256[4] memory coords) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                'x1="',
                coords[0].toString(),
                '%" '
                'y1="',
                coords[1].toString(),
                '%" '
                'x2="',
                coords[2].toString(),
                '%" '
                'y2="',
                coords[3].toString(),
                '%" '
            );
    }

    /**
        @dev internal helper to create `Gradient` SVG tag
     */
    function linearGradient(
        Color[] memory colors,
        uint256 id,
        uint256[4] memory coords
    ) internal pure returns (bytes memory) {
        string memory stops = "";
        for (uint256 i = 0; i < colors.length; i++) {
            if (colors[i].h != 0) {
                stops = string.concat(stops, string(colorStop(colors[i])));
            }
        }
        return
            abi.encodePacked(
                "<linearGradient  ",
                pos(coords),
                'id="g',
                id.toString(),
                '">',
                stops,
                "</linearGradient>"
            );
    }

    /**
        @dev internal helper to create `Defs` SVG tag
     */
    function defs(Gradient memory grad) internal pure returns (bytes memory) {
        return abi.encodePacked("<defs>", linearGradient(grad.colors, 0, grad.coords), "</defs>");
    }

    /**
        @dev internal helper to create `Rect` SVG tag
     */
    function rect(uint256 id) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                "<rect "
                'width="100%" '
                'height="100%" '
                'fill="url(#g',
                id.toString(),
                ')" '
                'rx="10px" '
                'ry="10px" '
                'stroke-linejoin="round" '
                "/>"
            );
    }

    /**
        @dev internal helper to create border `Rect` SVG tag
     */
    function border() internal pure returns (string memory) {
        return
            "<rect "
            'width="94%" '
            'height="96%" '
            'fill="transparent" '
            'rx="10px" '
            'ry="10px" '
            'stroke-linejoin="round" '
            'x="3%" '
            'y="2%" '
            'stroke-dasharray="1,6" '
            'stroke="white" '
            "/>";
    }

    /**
        @dev internal helper to create group `G` SVG tag
     */
    function g(uint256 gradientsCount) internal pure returns (bytes memory) {
        string memory background = "";
        for (uint256 i = 0; i < gradientsCount; i++) {
            background = string.concat(background, string(rect(i)));
        }
        return abi.encodePacked("<g>", background, border(), "</g>");
    }

    /**
        @dev internal helper to create XEN logo line pattern with 2 SVG `lines`
     */
    function logo() internal pure returns (bytes memory) {
        return abi.encodePacked();
    }

    /**
        @dev internal helper to create `Text` SVG tag with XEN Crypto contract data
     */
    function contractData(string memory symbol, address xenAddress) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                "<text "
                'x="50%" '
                'y="5%" '
                'class="base small" '
                'dominant-baseline="middle" '
                'text-anchor="middle">',
                symbol,
                unicode"・",
                xenAddress.toHexString(),
                "</text>"
            );
    }

    /**
        @dev internal helper to create cRank range string
     */
    function rankAndCount(uint256 rank, uint256 count) internal pure returns (bytes memory) {
        if (count == 1) return abi.encodePacked(rank.toString());
        return abi.encodePacked(rank.toString(), "..", (rank + count - 1).toString());
    }

    /**
        @dev internal helper to create 1st part of metadata section of SVG
     */
    function meta1(
        uint256 tokenId,
        uint256 count,
        uint256 eaa,
        string memory series,
        uint256 xenBurned
    ) internal pure returns (bytes memory) {
        bytes memory part1 = abi.encodePacked(
            "<text "
            'x="50%" '
            'y="50%" '
            'class="base " '
            'dominant-baseline="middle" '
            'text-anchor="middle">'
            "XEN CRYPTO"
            "</text>"
            "<text "
            'x="50%" '
            'y="56%" '
            'class="base burn" '
            'text-anchor="middle" '
            'dominant-baseline="middle"> ',
            xenBurned > 0 ? string.concat((xenBurned / 10**18).toFormattedString(), " X") : "",
            "</text>"
            "<text "
            'x="18%" '
            'y="62%" '
            'class="base meta" '
            'dominant-baseline="middle"> '
            "#",
            tokenId.toString(),
            "</text>"
            "<text "
            'x="82%" '
            'y="62%" '
            'class="base meta series" '
            'dominant-baseline="middle" '
            'text-anchor="end" >',
            series,
            "</text>"
        );
        bytes memory part2 = abi.encodePacked(
            "<text "
            'x="18%" '
            'y="68%" '
            'class="base meta" '
            'dominant-baseline="middle" >'
            "VMU: ",
            count.toString(),
            "</text>"
            "<text "
            'x="18%" '
            'y="72%" '
            'class="base meta" '
            'dominant-baseline="middle" >'
            "EAA: ",
            (eaa / 10).toString(),
            "%"
            "</text>"
        );
        return abi.encodePacked(part1, part2);
    }

    /**
        @dev internal helper to create 2nd part of metadata section of SVG
     */
    function meta2(
        uint256 maturityTs,
        uint256 amp,
        uint256 term,
        uint256 rank,
        uint256 count
    ) internal pure returns (bytes memory) {
        bytes memory part3 = abi.encodePacked(
            "<text "
            'x="18%" '
            'y="76%" '
            'class="base meta" '
            'dominant-baseline="middle" >'
            "AMP: ",
            amp.toString(),
            "</text>"
            "<text "
            'x="18%" '
            'y="80%" '
            'class="base meta" '
            'dominant-baseline="middle" >'
            "Term: ",
            term.toString()
        );
        bytes memory part4 = abi.encodePacked(
            " days"
            "</text>"
            "<text "
            'x="18%" '
            'y="84%" '
            'class="base meta" '
            'dominant-baseline="middle" >'
            "cRank: ",
            rankAndCount(rank, count),
            "</text>"
            "<text "
            'x="18%" '
            'y="88%" '
            'class="base meta" '
            'dominant-baseline="middle" >'
            "Maturity: ",
            maturityTs.asString(),
            "</text>"
        );
        return abi.encodePacked(part3, part4);
    }

    /**
        @dev internal helper to create `Text` SVG tag for XEN quote
     */
    function quote(uint256 idx) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                "<text "
                'x="50%" '
                'y="95%" '
                'class="base small" '
                'dominant-baseline="middle" '
                'text-anchor="middle" >',
                StringData.getQuote(StringData.QUOTES, idx),
                "</text>"
            );
    }

    /**
        @dev internal helper to generate `Redeemed` stamp
     */
    function stamp(bool redeemed) internal pure returns (bytes memory) {
        if (!redeemed) return "";
        return
            abi.encodePacked(
                "<rect "
                'x="50%" '
                'y="77.5%" '
                'width="100" '
                'height="40" '
                'stroke="black" '
                'stroke-width="1" '
                'fill="none" '
                'rx="5px" '
                'ry="5px" '
                'transform="translate(-50,-20) '
                'rotate(-20,0,400)" />',
                "<text "
                'x="50%" '
                'y="77.5%" '
                'stroke="black" '
                'class="base meta" '
                'dominant-baseline="middle" '
                'text-anchor="middle" '
                'transform="translate(0,0) rotate(-20,-45,380)" >'
                "Redeemed"
                "</text>"
            );
    }

    /**
        @dev main internal helper to create SVG file representing XENFT
     */
    function image(
        SvgParams memory params,
        Gradient[] memory gradients,
        uint256 idx,
        bool apex,
        bool limited
    ) internal pure returns (bytes memory) {
        string memory mark = limited ? _LIMITED : apex ? _APEX : _COLLECTOR;
        bytes memory graphics = abi.encodePacked(defs(gradients[0]), _STYLE, g(gradients.length), _LOGO, mark);
        bytes memory metadata = abi.encodePacked(
            contractData(params.symbol, params.xenAddress),
            meta1(params.tokenId, params.count, params.eaa, params.series, params.xenBurned),
            meta2(params.maturityTs, params.amp, params.term, params.rank, params.count),
            quote(idx),
            stamp(params.redeemed)
        );
        return
            abi.encodePacked(
                "<svg "
                'xmlns="http://www.w3.org/2000/svg" '
                'preserveAspectRatio="xMinYMin meet" '
                'viewBox="0 0 350 566">',
                graphics,
                metadata,
                "</svg>"
            );
    }
}

File 4 of 38 : MintInfo.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

// mapping: NFT tokenId => MintInfo (used in tokenURI generation)
// MintInfo encoded as:
//      term (uint16)
//      | maturityTs (uint64)
//      | rank (uint128)
//      | amp (uint16)
//      | eaa (uint16)
//      | class (uint8):
//          [7] isApex
//          [6] isLimited
//          [0-5] powerGroupIdx
//      | redeemed (uint8)
library MintInfo {
    /**
        @dev helper to convert Bool to U256 type and make compiler happy
     */
    function toU256(bool x) internal pure returns (uint256 r) {
        assembly {
            r := x
        }
    }

    /**
        @dev encodes MintInfo record from its props
     */
    function encodeMintInfo(
        uint256 term,
        uint256 maturityTs,
        uint256 rank,
        uint256 amp,
        uint256 eaa,
        uint256 class_,
        bool redeemed
    ) public pure returns (uint256 info) {
        info = info | (toU256(redeemed) & 0xFF);
        info = info | ((class_ & 0xFF) << 8);
        info = info | ((eaa & 0xFFFF) << 16);
        info = info | ((amp & 0xFFFF) << 32);
        info = info | ((rank & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF) << 48);
        info = info | ((maturityTs & 0xFFFFFFFFFFFFFFFF) << 176);
        info = info | ((term & 0xFFFF) << 240);
    }

    /**
        @dev decodes MintInfo record and extracts all of its props
     */
    function decodeMintInfo(uint256 info)
        public
        pure
        returns (
            uint256 term,
            uint256 maturityTs,
            uint256 rank,
            uint256 amp,
            uint256 eaa,
            uint256 class,
            bool apex,
            bool limited,
            bool redeemed
        )
    {
        term = uint16(info >> 240);
        maturityTs = uint64(info >> 176);
        rank = uint128(info >> 48);
        amp = uint16(info >> 32);
        eaa = uint16(info >> 16);
        class = uint8(info >> 8) & 0x3F;
        apex = (uint8(info >> 8) & 0x80) > 0;
        limited = (uint8(info >> 8) & 0x40) > 0;
        redeemed = uint8(info) == 1;
    }

    /**
        @dev extracts `term` prop from encoded MintInfo
     */
    function getTerm(uint256 info) public pure returns (uint256 term) {
        (term, , , , , , , , ) = decodeMintInfo(info);
    }

    /**
        @dev extracts `maturityTs` prop from encoded MintInfo
     */
    function getMaturityTs(uint256 info) public pure returns (uint256 maturityTs) {
        (, maturityTs, , , , , , , ) = decodeMintInfo(info);
    }

    /**
        @dev extracts `rank` prop from encoded MintInfo
     */
    function getRank(uint256 info) public pure returns (uint256 rank) {
        (, , rank, , , , , , ) = decodeMintInfo(info);
    }

    /**
        @dev extracts `AMP` prop from encoded MintInfo
     */
    function getAMP(uint256 info) public pure returns (uint256 amp) {
        (, , , amp, , , , , ) = decodeMintInfo(info);
    }

    /**
        @dev extracts `EAA` prop from encoded MintInfo
     */
    function getEAA(uint256 info) public pure returns (uint256 eaa) {
        (, , , , eaa, , , , ) = decodeMintInfo(info);
    }

    /**
        @dev extracts `redeemed` prop from encoded MintInfo
     */
    function getClass(uint256 info)
        public
        pure
        returns (
            uint256 class_,
            bool apex,
            bool limited
        )
    {
        (, , , , , class_, apex, limited, ) = decodeMintInfo(info);
    }

    /**
        @dev extracts `redeemed` prop from encoded MintInfo
     */
    function getRedeemed(uint256 info) public pure returns (bool redeemed) {
        (, , , , , , , , redeemed) = decodeMintInfo(info);
    }
}

File 5 of 38 : Metadata.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "./MintInfo.sol";
import "./DateTime.sol";
import "./FormattedStrings.sol";
import "./SVG.sol";

/**
    @dev Library contains methods to generate on-chain NFT metadata
*/
library Metadata {
    using DateTime for uint256;
    using MintInfo for uint256;
    using Strings for uint256;

    uint256 public constant POWER_GROUP_SIZE = 7_500;
    uint256 public constant MAX_POWER = 52_500;

    uint256 public constant COLORS_FULL_SCALE = 300;
    uint256 public constant SPECIAL_LUMINOSITY = 45;
    uint256 public constant BASE_SATURATION = 75;
    uint256 public constant BASE_LUMINOSITY = 38;
    uint256 public constant GROUP_SATURATION = 100;
    uint256 public constant GROUP_LUMINOSITY = 50;
    uint256 public constant DEFAULT_OPACITY = 1;
    uint256 public constant NO_COLOR = 360;

    // PRIVATE HELPERS

    // The following pure methods returning arrays are workaround to use array constants,
    // not yet available in Solidity

    function _powerGroupColors() private pure returns (uint256[8] memory) {
        return [uint256(360), 1, 30, 60, 120, 180, 240, 300];
    }

    function _huesApex() private pure returns (uint256[3] memory) {
        return [uint256(169), 210, 305];
    }

    function _huesLimited() private pure returns (uint256[3] memory) {
        return [uint256(263), 0, 42];
    }

    function _stopOffsets() private pure returns (uint256[3] memory) {
        return [uint256(10), 50, 90];
    }

    function _gradColorsRegular() private pure returns (uint256[4] memory) {
        return [uint256(150), 150, 20, 20];
    }

    function _gradColorsBlack() private pure returns (uint256[4] memory) {
        return [uint256(100), 100, 20, 20];
    }

    function _gradColorsSpecial() private pure returns (uint256[4] memory) {
        return [uint256(100), 100, 0, 0];
    }

    /**
        @dev private helper to determine XENFT group index by its power
             (power = count of VMUs * mint term in days)
     */
    function _powerGroup(uint256 vmus, uint256 term) private pure returns (uint256) {
        return (vmus * term) / POWER_GROUP_SIZE;
    }

    /**
        @dev private helper to generate SVG gradients for special XENFT categories
     */
    function _specialClassGradients(bool rare) private pure returns (SVG.Gradient[] memory gradients) {
        uint256[3] memory specialColors = rare ? _huesApex() : _huesLimited();
        SVG.Color[] memory colors = new SVG.Color[](3);
        for (uint256 i = 0; i < colors.length; i++) {
            colors[i] = SVG.Color({
                h: specialColors[i],
                s: BASE_SATURATION,
                l: SPECIAL_LUMINOSITY,
                a: DEFAULT_OPACITY,
                off: _stopOffsets()[i]
            });
        }
        gradients = new SVG.Gradient[](1);
        gradients[0] = SVG.Gradient({colors: colors, id: 0, coords: _gradColorsSpecial()});
    }

    /**
        @dev private helper to generate SVG gradients for common XENFT category
     */
    function _commonCategoryGradients(uint256 vmus, uint256 term)
        private
        pure
        returns (SVG.Gradient[] memory gradients)
    {
        SVG.Color[] memory colors = new SVG.Color[](2);
        uint256 powerHue = term * vmus > MAX_POWER ? NO_COLOR : 1 + (term * vmus * COLORS_FULL_SCALE) / MAX_POWER;
        // group
        uint256 groupHue = _powerGroupColors()[_powerGroup(vmus, term) > 7 ? 7 : _powerGroup(vmus, term)];
        colors[0] = SVG.Color({
            h: groupHue,
            s: groupHue == NO_COLOR ? 0 : GROUP_SATURATION,
            l: groupHue == NO_COLOR ? 0 : GROUP_LUMINOSITY,
            a: DEFAULT_OPACITY,
            off: _stopOffsets()[0]
        });
        // power
        colors[1] = SVG.Color({
            h: powerHue,
            s: powerHue == NO_COLOR ? 0 : BASE_SATURATION,
            l: powerHue == NO_COLOR ? 0 : BASE_LUMINOSITY,
            a: DEFAULT_OPACITY,
            off: _stopOffsets()[2]
        });
        gradients = new SVG.Gradient[](1);
        gradients[0] = SVG.Gradient({
            colors: colors,
            id: 0,
            coords: groupHue == NO_COLOR ? _gradColorsBlack() : _gradColorsRegular()
        });
    }

    // PUBLIC INTERFACE

    /**
        @dev public interface to generate SVG image based on XENFT params
     */
    function svgData(
        uint256 tokenId,
        uint256 count,
        uint256 info,
        address token,
        uint256 burned
    ) external view returns (bytes memory) {
        string memory symbol = IERC20Metadata(token).symbol();
        (uint256 classIds, bool rare, bool limited) = info.getClass();
        SVG.SvgParams memory params = SVG.SvgParams({
            symbol: symbol,
            xenAddress: token,
            tokenId: tokenId,
            term: info.getTerm(),
            rank: info.getRank(),
            count: count,
            maturityTs: info.getMaturityTs(),
            amp: info.getAMP(),
            eaa: info.getEAA(),
            xenBurned: burned,
            series: StringData.getClassName(StringData.CLASSES, classIds),
            redeemed: info.getRedeemed()
        });
        uint256 quoteIdx = uint256(keccak256(abi.encode(info))) % StringData.QUOTES_COUNT;
        if (rare || limited) {
            return SVG.image(params, _specialClassGradients(rare), quoteIdx, rare, limited);
        }
        return SVG.image(params, _commonCategoryGradients(count, info.getTerm()), quoteIdx, rare, limited);
    }

    function _attr1(
        uint256 count,
        uint256 rank,
        uint256 class_
    ) private pure returns (bytes memory) {
        return
            abi.encodePacked(
                '{"trait_type":"Class","value":"',
                StringData.getClassName(StringData.CLASSES, class_),
                '"},'
                '{"trait_type":"VMUs","value":"',
                count.toString(),
                '"},'
                '{"trait_type":"cRank","value":"',
                rank.toString(),
                '"},'
            );
    }

    function _attr2(
        uint256 amp,
        uint256 eaa,
        uint256 maturityTs
    ) private pure returns (bytes memory) {
        (uint256 year, string memory month) = DateTime.yearAndMonth(maturityTs);
        return
            abi.encodePacked(
                '{"trait_type":"AMP","value":"',
                amp.toString(),
                '"},'
                '{"trait_type":"EAA (%)","value":"',
                (eaa / 10).toString(),
                '"},'
                '{"trait_type":"Maturity Year","value":"',
                year.toString(),
                '"},'
                '{"trait_type":"Maturity Month","value":"',
                month,
                '"},'
            );
    }

    function _attr3(
        uint256 maturityTs,
        uint256 term,
        uint256 burned
    ) private pure returns (bytes memory) {
        return
            abi.encodePacked(
                '{"trait_type":"Maturity DateTime","value":"',
                maturityTs.asString(),
                '"},'
                '{"trait_type":"Term","value":"',
                term.toString(),
                '"},'
                '{"trait_type":"XEN Burned","value":"',
                (burned / 10**18).toString(),
                '"},'
            );
    }

    function _attr4(bool apex, bool limited) private pure returns (bytes memory) {
        string memory category = "Collector";
        if (limited) category = "Limited";
        if (apex) category = "Apex";
        return abi.encodePacked('{"trait_type":"Category","value":"', category, '"}');
    }

    /**
        @dev private helper to construct attributes portion of NFT metadata
     */
    function attributes(
        uint256 count,
        uint256 burned,
        uint256 mintInfo
    ) external pure returns (bytes memory) {
        (
            uint256 term,
            uint256 maturityTs,
            uint256 rank,
            uint256 amp,
            uint256 eaa,
            uint256 series,
            bool apex,
            bool limited,

        ) = MintInfo.decodeMintInfo(mintInfo);
        return
            abi.encodePacked(
                "[",
                _attr1(count, rank, series),
                _attr2(amp, eaa, maturityTs),
                _attr3(maturityTs, term, burned),
                _attr4(apex, limited),
                "]"
            );
    }

    function formattedString(uint256 n) public pure returns (string memory) {
        return FormattedStrings.toFormattedString(n);
    }
}

File 6 of 38 : FormattedStrings.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

library FormattedStrings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
            Base on OpenZeppelin `toString` method from `String` library
     */
    function toFormattedString(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;
        }
        uint256 pos;
        uint256 comas = digits / 3;
        digits = digits + (digits % 3 == 0 ? comas - 1 : comas);
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            if (pos == 3) {
                buffer[digits] = ",";
                pos = 0;
            } else {
                buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
                value /= 10;
                pos++;
            }
        }
        return string(buffer);
    }
}

File 7 of 38 : ERC2771Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (metatx/ERC2771Context.sol)

pragma solidity ^0.8.10;

import "@openzeppelin/contracts/utils/Context.sol";

/**
 * @dev Context variant with ERC2771 support.
 */
abstract contract ERC2771Context is Context {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    // one-time settable var
    address internal _trustedForwarder;

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor(address trustedForwarder) {
        _trustedForwarder = trustedForwarder;
    }

    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
        return forwarder == _trustedForwarder;
    }

    function _msgSender() internal view virtual override returns (address sender) {
        if (isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            /// @solidity memory-safe-assembly
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 20)))
            }
        } else {
            return super._msgSender();
        }
    }

    function _msgData() internal view virtual override returns (bytes calldata) {
        if (isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 20];
        } else {
            return super._msgData();
        }
    }
}

File 8 of 38 : DateTime.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts/utils/Strings.sol";
import "./BokkyPooBahsDateTimeLibrary.sol";

/*
    @dev        Library to convert epoch timestamp to a human-readable Date-Time string
    @dependency uses BokkyPooBahsDateTimeLibrary.sol library internally
 */
library DateTime {
    using Strings for uint256;

    bytes public constant MONTHS = bytes("JanFebMarAprMayJunJulAugSepOctNovDec");

    /**
     *   @dev returns month as short (3-letter) string
     */
    function monthAsString(uint256 idx) internal pure returns (string memory) {
        require(idx > 0, "bad idx");
        bytes memory str = new bytes(3);
        uint256 offset = (idx - 1) * 3;
        str[0] = bytes1(MONTHS[offset]);
        str[1] = bytes1(MONTHS[offset + 1]);
        str[2] = bytes1(MONTHS[offset + 2]);
        return string(str);
    }

    /**
     *   @dev returns string representation of number left-padded for 2 symbols
     */
    function asPaddedString(uint256 n) internal pure returns (string memory) {
        if (n == 0) return "00";
        if (n < 10) return string.concat("0", n.toString());
        return n.toString();
    }

    /**
     *   @dev returns string of format 'Jan 01, 2022 18:00 UTC' for a given timestamp
     */
    function asString(uint256 ts) external pure returns (string memory) {
        (uint256 year, uint256 month, uint256 day, uint256 hour, uint256 minute, ) = BokkyPooBahsDateTimeLibrary
            .timestampToDateTime(ts);
        return
            string(
                abi.encodePacked(
                    monthAsString(month),
                    " ",
                    day.toString(),
                    ", ",
                    year.toString(),
                    " ",
                    asPaddedString(hour),
                    ":",
                    asPaddedString(minute),
                    " UTC"
                )
            );
    }

    /**
     *   @dev returns (year, month as string) components of a date by timestamp
     */
    function yearAndMonth(uint256 ts) external pure returns (uint256, string memory) {
        (uint256 year, uint256 month, , , , ) = BokkyPooBahsDateTimeLibrary.timestampToDateTime(ts);
        return (year, monthAsString(month));
    }
}

File 9 of 38 : BokkyPooBahsDateTimeLibrary.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

// ----------------------------------------------------------------------------
// BokkyPooBah's DateTime Library v1.01
//
// A gas-efficient Solidity date and time library
//
// https://github.com/bokkypoobah/BokkyPooBahsDateTimeLibrary
//
// Tested date range 1970/01/01 to 2345/12/31
//
// Conventions:
// Unit      | Range         | Notes
// :-------- |:-------------:|:-----
// timestamp | >= 0          | Unix timestamp, number of seconds since 1970/01/01 00:00:00 UTC
// year      | 1970 ... 2345 |
// month     | 1 ... 12      |
// day       | 1 ... 31      |
// hour      | 0 ... 23      |
// minute    | 0 ... 59      |
// second    | 0 ... 59      |
// dayOfWeek | 1 ... 7       | 1 = Monday, ..., 7 = Sunday
//
//
// Enjoy. (c) BokkyPooBah / Bok Consulting Pty Ltd 2018-2019. The MIT Licence.
// ----------------------------------------------------------------------------

library BokkyPooBahsDateTimeLibrary {
    uint256 constant _SECONDS_PER_DAY = 24 * 60 * 60;
    uint256 constant _SECONDS_PER_HOUR = 60 * 60;
    uint256 constant _SECONDS_PER_MINUTE = 60;
    int256 constant _OFFSET19700101 = 2440588;

    uint256 constant _DOW_FRI = 5;
    uint256 constant _DOW_SAT = 6;

    // ------------------------------------------------------------------------
    // Calculate the number of days from 1970/01/01 to year/month/day using
    // the date conversion algorithm from
    //   https://aa.usno.navy.mil/faq/JD_formula.html
    // and subtracting the offset 2440588 so that 1970/01/01 is day 0
    //
    // days = day
    //      - 32075
    //      + 1461 * (year + 4800 + (month - 14) / 12) / 4
    //      + 367 * (month - 2 - (month - 14) / 12 * 12) / 12
    //      - 3 * ((year + 4900 + (month - 14) / 12) / 100) / 4
    //      - offset
    // ------------------------------------------------------------------------
    function _daysFromDate(
        uint256 year,
        uint256 month,
        uint256 day
    ) private pure returns (uint256 _days) {
        require(year >= 1970);
        int256 _year = int256(year);
        int256 _month = int256(month);
        int256 _day = int256(day);

        int256 __days = _day -
            32075 +
            (1461 * (_year + 4800 + (_month - 14) / 12)) /
            4 +
            (367 * (_month - 2 - ((_month - 14) / 12) * 12)) /
            12 -
            (3 * ((_year + 4900 + (_month - 14) / 12) / 100)) /
            4 -
            _OFFSET19700101;

        _days = uint256(__days);
    }

    // ------------------------------------------------------------------------
    // Calculate year/month/day from the number of days since 1970/01/01 using
    // the date conversion algorithm from
    //   http://aa.usno.navy.mil/faq/docs/JD_Formula.php
    // and adding the offset 2440588 so that 1970/01/01 is day 0
    //
    // int L = days + 68569 + offset
    // int N = 4 * L / 146097
    // L = L - (146097 * N + 3) / 4
    // year = 4000 * (L + 1) / 1461001
    // L = L - 1461 * year / 4 + 31
    // month = 80 * L / 2447
    // dd = L - 2447 * month / 80
    // L = month / 11
    // month = month + 2 - 12 * L
    // year = 100 * (N - 49) + year + L
    // ------------------------------------------------------------------------
    function _daysToDate(uint256 _days)
        private
        pure
        returns (
            uint256 year,
            uint256 month,
            uint256 day
        )
    {
        int256 __days = int256(_days);

        int256 L = __days + 68569 + _OFFSET19700101;
        int256 N = (4 * L) / 146097;
        L = L - (146097 * N + 3) / 4;
        int256 _year = (4000 * (L + 1)) / 1461001;
        L = L - (1461 * _year) / 4 + 31;
        int256 _month = (80 * L) / 2447;
        int256 _day = L - (2447 * _month) / 80;
        L = _month / 11;
        _month = _month + 2 - 12 * L;
        _year = 100 * (N - 49) + _year + L;

        year = uint256(_year);
        month = uint256(_month);
        day = uint256(_day);
    }

    function timestampFromDate(
        uint256 year,
        uint256 month,
        uint256 day
    ) internal pure returns (uint256 timestamp) {
        timestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY;
    }

    function timestampFromDateTime(
        uint256 year,
        uint256 month,
        uint256 day,
        uint256 hour,
        uint256 minute,
        uint256 second
    ) internal pure returns (uint256 timestamp) {
        timestamp =
            _daysFromDate(year, month, day) *
            _SECONDS_PER_DAY +
            hour *
            _SECONDS_PER_HOUR +
            minute *
            _SECONDS_PER_MINUTE +
            second;
    }

    function timestampToDate(uint256 timestamp)
        internal
        pure
        returns (
            uint256 year,
            uint256 month,
            uint256 day
        )
    {
        (year, month, day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
    }

    function timestampToDateTime(uint256 timestamp)
        internal
        pure
        returns (
            uint256 year,
            uint256 month,
            uint256 day,
            uint256 hour,
            uint256 minute,
            uint256 second
        )
    {
        (year, month, day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
        uint256 secs = timestamp % _SECONDS_PER_DAY;
        hour = secs / _SECONDS_PER_HOUR;
        secs = secs % _SECONDS_PER_HOUR;
        minute = secs / _SECONDS_PER_MINUTE;
        second = secs % _SECONDS_PER_MINUTE;
    }

    function isValidDate(
        uint256 year,
        uint256 month,
        uint256 day
    ) internal pure returns (bool valid) {
        if (year >= 1970 && month > 0 && month <= 12) {
            uint256 daysInMonth = _getDaysInMonth(year, month);
            if (day > 0 && day <= daysInMonth) {
                valid = true;
            }
        }
    }

    function isValidDateTime(
        uint256 year,
        uint256 month,
        uint256 day,
        uint256 hour,
        uint256 minute,
        uint256 second
    ) internal pure returns (bool valid) {
        if (isValidDate(year, month, day)) {
            if (hour < 24 && minute < 60 && second < 60) {
                valid = true;
            }
        }
    }

    function isLeapYear(uint256 timestamp) internal pure returns (bool leapYear) {
        (uint256 year, , ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
        leapYear = _isLeapYear(year);
    }

    function _isLeapYear(uint256 year) private pure returns (bool leapYear) {
        leapYear = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
    }

    function isWeekDay(uint256 timestamp) internal pure returns (bool weekDay) {
        weekDay = getDayOfWeek(timestamp) <= _DOW_FRI;
    }

    function isWeekEnd(uint256 timestamp) internal pure returns (bool weekEnd) {
        weekEnd = getDayOfWeek(timestamp) >= _DOW_SAT;
    }

    function getDaysInMonth(uint256 timestamp) internal pure returns (uint256 daysInMonth) {
        (uint256 year, uint256 month, ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
        daysInMonth = _getDaysInMonth(year, month);
    }

    function _getDaysInMonth(uint256 year, uint256 month) private pure returns (uint256 daysInMonth) {
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
            daysInMonth = 31;
        } else if (month != 2) {
            daysInMonth = 30;
        } else {
            daysInMonth = _isLeapYear(year) ? 29 : 28;
        }
    }

    // 1 = Monday, 7 = Sunday
    function getDayOfWeek(uint256 timestamp) internal pure returns (uint256 dayOfWeek) {
        uint256 _days = timestamp / _SECONDS_PER_DAY;
        dayOfWeek = ((_days + 3) % 7) + 1;
    }

    function getYear(uint256 timestamp) internal pure returns (uint256 year) {
        (year, , ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
    }

    function getMonth(uint256 timestamp) internal pure returns (uint256 month) {
        (, month, ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
    }

    function getDay(uint256 timestamp) internal pure returns (uint256 day) {
        (, , day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
    }

    function getHour(uint256 timestamp) internal pure returns (uint256 hour) {
        uint256 secs = timestamp % _SECONDS_PER_DAY;
        hour = secs / _SECONDS_PER_HOUR;
    }

    function getMinute(uint256 timestamp) internal pure returns (uint256 minute) {
        uint256 secs = timestamp % _SECONDS_PER_HOUR;
        minute = secs / _SECONDS_PER_MINUTE;
    }

    function getSecond(uint256 timestamp) internal pure returns (uint256 second) {
        second = timestamp % _SECONDS_PER_MINUTE;
    }

    function addYears(uint256 timestamp, uint256 _years) internal pure returns (uint256 newTimestamp) {
        (uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
        year += _years;
        uint256 daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
        require(newTimestamp >= timestamp);
    }

    function addMonths(uint256 timestamp, uint256 _months) internal pure returns (uint256 newTimestamp) {
        (uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
        month += _months;
        year += (month - 1) / 12;
        month = ((month - 1) % 12) + 1;
        uint256 daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
        require(newTimestamp >= timestamp);
    }

    function addDays(uint256 timestamp, uint256 _days) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp + _days * _SECONDS_PER_DAY;
        require(newTimestamp >= timestamp);
    }

    function addHours(uint256 timestamp, uint256 _hours) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp + _hours * _SECONDS_PER_HOUR;
        require(newTimestamp >= timestamp);
    }

    function addMinutes(uint256 timestamp, uint256 _minutes) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp + _minutes * _SECONDS_PER_MINUTE;
        require(newTimestamp >= timestamp);
    }

    function addSeconds(uint256 timestamp, uint256 _seconds) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp + _seconds;
        require(newTimestamp >= timestamp);
    }

    function subYears(uint256 timestamp, uint256 _years) internal pure returns (uint256 newTimestamp) {
        (uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
        year -= _years;
        uint256 daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
        require(newTimestamp <= timestamp);
    }

    function subMonths(uint256 timestamp, uint256 _months) internal pure returns (uint256 newTimestamp) {
        (uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
        uint256 yearMonth = year * 12 + (month - 1) - _months;
        year = yearMonth / 12;
        month = (yearMonth % 12) + 1;
        uint256 daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
        require(newTimestamp <= timestamp);
    }

    function subDays(uint256 timestamp, uint256 _days) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp - _days * _SECONDS_PER_DAY;
        require(newTimestamp <= timestamp);
    }

    function subHours(uint256 timestamp, uint256 _hours) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp - _hours * _SECONDS_PER_HOUR;
        require(newTimestamp <= timestamp);
    }

    function subMinutes(uint256 timestamp, uint256 _minutes) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp - _minutes * _SECONDS_PER_MINUTE;
        require(newTimestamp <= timestamp);
    }

    function subSeconds(uint256 timestamp, uint256 _seconds) internal pure returns (uint256 newTimestamp) {
        newTimestamp = timestamp - _seconds;
        require(newTimestamp <= timestamp);
    }

    function diffYears(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _years) {
        require(fromTimestamp <= toTimestamp);
        (uint256 fromYear, , ) = _daysToDate(fromTimestamp / _SECONDS_PER_DAY);
        (uint256 toYear, , ) = _daysToDate(toTimestamp / _SECONDS_PER_DAY);
        _years = toYear - fromYear;
    }

    function diffMonths(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _months) {
        require(fromTimestamp <= toTimestamp);
        (uint256 fromYear, uint256 fromMonth, ) = _daysToDate(fromTimestamp / _SECONDS_PER_DAY);
        (uint256 toYear, uint256 toMonth, ) = _daysToDate(toTimestamp / _SECONDS_PER_DAY);
        _months = toYear * 12 + toMonth - fromYear * 12 - fromMonth;
    }

    function diffDays(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _days) {
        require(fromTimestamp <= toTimestamp);
        _days = (toTimestamp - fromTimestamp) / _SECONDS_PER_DAY;
    }

    function diffHours(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _hours) {
        require(fromTimestamp <= toTimestamp);
        _hours = (toTimestamp - fromTimestamp) / _SECONDS_PER_HOUR;
    }

    function diffMinutes(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _minutes) {
        require(fromTimestamp <= toTimestamp);
        _minutes = (toTimestamp - fromTimestamp) / _SECONDS_PER_MINUTE;
    }

    function diffSeconds(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _seconds) {
        require(fromTimestamp <= toTimestamp);
        _seconds = toTimestamp - fromTimestamp;
    }
}

File 10 of 38 : Array.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

library Array {
    function idx(uint256[] memory arr, uint256 item) internal pure returns (uint256 i) {
        for (i = 1; i <= arr.length; i++) {
            if (arr[i - 1] == item) {
                return i;
            }
        }
        i = 0;
    }

    function addItem(uint256[] storage arr, uint256 item) internal {
        if (idx(arr, item) == 0) {
            arr.push(item);
        }
    }

    function removeItem(uint256[] storage arr, uint256 item) internal {
        uint256 i = idx(arr, item);
        if (i > 0) {
            arr[i - 1] = arr[arr.length - 1];
            arr.pop();
        }
    }

    function contains(uint256[] memory container, uint256[] memory items) internal pure returns (bool) {
        if (items.length == 0) return true;
        for (uint256 i = 0; i < items.length; i++) {
            bool itemIsContained = false;
            for (uint256 j = 0; j < container.length; j++) {
                itemIsContained = items[i] == container[j];
            }
            if (!itemIsContained) return false;
        }
        return true;
    }

    function asSingletonArray(uint256 element) internal pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;
        return array;
    }

    function hasDuplicatesOrZeros(uint256[] memory array) internal pure returns (bool) {
        for (uint256 i = 0; i < array.length; i++) {
            if (array[i] == 0) return true;
            for (uint256 j = 0; j < array.length; j++) {
                if (array[i] == array[j] && i != j) return true;
            }
        }
        return false;
    }

    function hasRoguesOrZeros(uint256[] memory array) internal pure returns (bool) {
        uint256 _first = array[0];
        for (uint256 i = 0; i < array.length; i++) {
            if (array[i] == 0 || array[i] != _first) return true;
        }
        return false;
    }
}

File 11 of 38 : IXENTorrent.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IXENTorrent {
    event StartTorrent(address indexed user, uint256 count, uint256 term);
    event EndTorrent(address indexed user, uint256 tokenId, address to);

    function bulkClaimRank(uint256 count, uint256 term) external returns (uint256);

    function bulkClaimMintReward(uint256 tokenId, address to) external;
}

File 12 of 38 : IXENProxying.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IXENProxying {
    function callClaimRank(uint256 term) external;

    function callClaimMintReward(address to) external;

    function powerDown() external;
}

File 13 of 38 : IERC2771.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IERC2771 {
    function isTrustedForwarder(address forwarder) external;
}

File 14 of 38 : OperatorFilterer.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {IOperatorFilterRegistry} from "./IOperatorFilterRegistry.sol";

/**
 * @title  OperatorFilterer
 * @notice Abstract contract whose constructor automatically registers and optionally subscribes to or copies another
 *         registrant's entries in the OperatorFilterRegistry.
 * @dev    This smart contract is meant to be inherited by token contracts so they can use the following:
 *         - `onlyAllowedOperator` modifier for `transferFrom` and `safeTransferFrom` methods.
 *         - `onlyAllowedOperatorApproval` modifier for `approve` and `setApprovalForAll` methods.
 */
abstract contract OperatorFilterer {
    error OperatorNotAllowed(address operator);

    IOperatorFilterRegistry public constant OPERATOR_FILTER_REGISTRY =
        IOperatorFilterRegistry(0x000000000000AAeB6D7670E522A718067333cd4E);

    constructor(address subscriptionOrRegistrantToCopy, bool subscribe) {
        // If an inheriting token contract is deployed to a network without the registry deployed, the modifier
        // will not revert, but the contract will need to be registered with the registry once it is deployed in
        // order for the modifier to filter addresses.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            if (subscribe) {
                OPERATOR_FILTER_REGISTRY.registerAndSubscribe(address(this), subscriptionOrRegistrantToCopy);
            } else {
                if (subscriptionOrRegistrantToCopy != address(0)) {
                    OPERATOR_FILTER_REGISTRY.registerAndCopyEntries(address(this), subscriptionOrRegistrantToCopy);
                } else {
                    OPERATOR_FILTER_REGISTRY.register(address(this));
                }
            }
        }
    }

    modifier onlyAllowedOperator(address from) virtual {
        // Allow spending tokens from addresses with balance
        // Note that this still allows listings and marketplaces with escrow to transfer tokens if transferred
        // from an EOA.
        if (from != msg.sender) {
            _checkFilterOperator(msg.sender);
        }
        _;
    }

    modifier onlyAllowedOperatorApproval(address operator) virtual {
        _checkFilterOperator(operator);
        _;
    }

    function _checkFilterOperator(address operator) internal view virtual {
        // Check registry code length to facilitate testing in environments without a deployed registry.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), operator)) {
                revert OperatorNotAllowed(operator);
            }
        }
    }
}

File 15 of 38 : IOperatorFilterRegistry.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IOperatorFilterRegistry {
    function isOperatorAllowed(address registrant, address operator) external view returns (bool);
    function register(address registrant) external;
    function registerAndSubscribe(address registrant, address subscription) external;
    function registerAndCopyEntries(address registrant, address registrantToCopy) external;
    function unregister(address addr) external;
    function updateOperator(address registrant, address operator, bool filtered) external;
    function updateOperators(address registrant, address[] calldata operators, bool filtered) external;
    function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;
    function updateCodeHashes(address registrant, bytes32[] calldata codeHashes, bool filtered) external;
    function subscribe(address registrant, address registrantToSubscribe) external;
    function unsubscribe(address registrant, bool copyExistingEntries) external;
    function subscriptionOf(address addr) external returns (address registrant);
    function subscribers(address registrant) external returns (address[] memory);
    function subscriberAt(address registrant, uint256 index) external returns (address);
    function copyEntriesOf(address registrant, address registrantToCopy) external;
    function isOperatorFiltered(address registrant, address operator) external returns (bool);
    function isCodeHashOfFiltered(address registrant, address operatorWithCode) external returns (bool);
    function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);
    function filteredOperators(address addr) external returns (address[] memory);
    function filteredCodeHashes(address addr) external returns (bytes32[] memory);
    function filteredOperatorAt(address registrant, uint256 index) external returns (address);
    function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);
    function isRegistered(address addr) external returns (bool);
    function codeHashOf(address addr) external returns (bytes32);
}

File 16 of 38 : DefaultOperatorFilterer.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {OperatorFilterer} from "./OperatorFilterer.sol";

/**
 * @title  DefaultOperatorFilterer
 * @notice Inherits from OperatorFilterer and automatically subscribes to the default OpenSea subscription.
 */
abstract contract DefaultOperatorFilterer is OperatorFilterer {
    address constant DEFAULT_SUBSCRIPTION = address(0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6);

    constructor() OperatorFilterer(DEFAULT_SUBSCRIPTION, true) {}
}

File 17 of 38 : ABDKMath64x64.sol
// SPDX-License-Identifier: BSD-4-Clause
/*
 * ABDK Math 64.64 Smart Contract Library.  Copyright © 2019 by ABDK Consulting.
 * Author: Mikhail Vladimirov <[email protected]>
 */
pragma solidity ^0.8.0;

/**
 * Smart contract library of mathematical functions operating with signed
 * 64.64-bit fixed point numbers.  Signed 64.64-bit fixed point number is
 * basically a simple fraction whose numerator is signed 128-bit integer and
 * denominator is 2^64.  As long as denominator is always the same, there is no
 * need to store it, thus in Solidity signed 64.64-bit fixed point numbers are
 * represented by int128 type holding only the numerator.
 */
library ABDKMath64x64 {
  /*
   * Minimum value signed 64.64-bit fixed point number may have. 
   */
  int128 private constant MIN_64x64 = -0x80000000000000000000000000000000;

  /*
   * Maximum value signed 64.64-bit fixed point number may have. 
   */
  int128 private constant MAX_64x64 = 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

  /**
   * Convert signed 256-bit integer number into signed 64.64-bit fixed point
   * number.  Revert on overflow.
   *
   * @param x signed 256-bit integer number
   * @return signed 64.64-bit fixed point number
   */
  function fromInt (int256 x) internal pure returns (int128) {
    unchecked {
      require (x >= -0x8000000000000000 && x <= 0x7FFFFFFFFFFFFFFF);
      return int128 (x << 64);
    }
  }

  /**
   * Convert signed 64.64 fixed point number into signed 64-bit integer number
   * rounding down.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64-bit integer number
   */
  function toInt (int128 x) internal pure returns (int64) {
    unchecked {
      return int64 (x >> 64);
    }
  }

  /**
   * Convert unsigned 256-bit integer number into signed 64.64-bit fixed point
   * number.  Revert on overflow.
   *
   * @param x unsigned 256-bit integer number
   * @return signed 64.64-bit fixed point number
   */
  function fromUInt (uint256 x) internal pure returns (int128) {
    unchecked {
      require (x <= 0x7FFFFFFFFFFFFFFF);
      return int128 (int256 (x << 64));
    }
  }

  /**
   * Convert signed 64.64 fixed point number into unsigned 64-bit integer
   * number rounding down.  Revert on underflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @return unsigned 64-bit integer number
   */
  function toUInt (int128 x) internal pure returns (uint64) {
    unchecked {
      require (x >= 0);
      return uint64 (uint128 (x >> 64));
    }
  }

  /**
   * Convert signed 128.128 fixed point number into signed 64.64-bit fixed point
   * number rounding down.  Revert on overflow.
   *
   * @param x signed 128.128-bin fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function from128x128 (int256 x) internal pure returns (int128) {
    unchecked {
      int256 result = x >> 64;
      require (result >= MIN_64x64 && result <= MAX_64x64);
      return int128 (result);
    }
  }

  /**
   * Convert signed 64.64 fixed point number into signed 128.128 fixed point
   * number.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 128.128 fixed point number
   */
  function to128x128 (int128 x) internal pure returns (int256) {
    unchecked {
      return int256 (x) << 64;
    }
  }

  /**
   * Calculate x + y.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @param y signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function add (int128 x, int128 y) internal pure returns (int128) {
    unchecked {
      int256 result = int256(x) + y;
      require (result >= MIN_64x64 && result <= MAX_64x64);
      return int128 (result);
    }
  }

  /**
   * Calculate x - y.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @param y signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function sub (int128 x, int128 y) internal pure returns (int128) {
    unchecked {
      int256 result = int256(x) - y;
      require (result >= MIN_64x64 && result <= MAX_64x64);
      return int128 (result);
    }
  }

  /**
   * Calculate x * y rounding down.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @param y signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function mul (int128 x, int128 y) internal pure returns (int128) {
    unchecked {
      int256 result = int256(x) * y >> 64;
      require (result >= MIN_64x64 && result <= MAX_64x64);
      return int128 (result);
    }
  }

  /**
   * Calculate x * y rounding towards zero, where x is signed 64.64 fixed point
   * number and y is signed 256-bit integer number.  Revert on overflow.
   *
   * @param x signed 64.64 fixed point number
   * @param y signed 256-bit integer number
   * @return signed 256-bit integer number
   */
  function muli (int128 x, int256 y) internal pure returns (int256) {
    unchecked {
      if (x == MIN_64x64) {
        require (y >= -0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF &&
          y <= 0x1000000000000000000000000000000000000000000000000);
        return -y << 63;
      } else {
        bool negativeResult = false;
        if (x < 0) {
          x = -x;
          negativeResult = true;
        }
        if (y < 0) {
          y = -y; // We rely on overflow behavior here
          negativeResult = !negativeResult;
        }
        uint256 absoluteResult = mulu (x, uint256 (y));
        if (negativeResult) {
          require (absoluteResult <=
            0x8000000000000000000000000000000000000000000000000000000000000000);
          return -int256 (absoluteResult); // We rely on overflow behavior here
        } else {
          require (absoluteResult <=
            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
          return int256 (absoluteResult);
        }
      }
    }
  }

  /**
   * Calculate x * y rounding down, where x is signed 64.64 fixed point number
   * and y is unsigned 256-bit integer number.  Revert on overflow.
   *
   * @param x signed 64.64 fixed point number
   * @param y unsigned 256-bit integer number
   * @return unsigned 256-bit integer number
   */
  function mulu (int128 x, uint256 y) internal pure returns (uint256) {
    unchecked {
      if (y == 0) return 0;

      require (x >= 0);

      uint256 lo = (uint256 (int256 (x)) * (y & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)) >> 64;
      uint256 hi = uint256 (int256 (x)) * (y >> 128);

      require (hi <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
      hi <<= 64;

      require (hi <=
        0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF - lo);
      return hi + lo;
    }
  }

  /**
   * Calculate x / y rounding towards zero.  Revert on overflow or when y is
   * zero.
   *
   * @param x signed 64.64-bit fixed point number
   * @param y signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function div (int128 x, int128 y) internal pure returns (int128) {
    unchecked {
      require (y != 0);
      int256 result = (int256 (x) << 64) / y;
      require (result >= MIN_64x64 && result <= MAX_64x64);
      return int128 (result);
    }
  }

  /**
   * Calculate x / y rounding towards zero, where x and y are signed 256-bit
   * integer numbers.  Revert on overflow or when y is zero.
   *
   * @param x signed 256-bit integer number
   * @param y signed 256-bit integer number
   * @return signed 64.64-bit fixed point number
   */
  function divi (int256 x, int256 y) internal pure returns (int128) {
    unchecked {
      require (y != 0);

      bool negativeResult = false;
      if (x < 0) {
        x = -x; // We rely on overflow behavior here
        negativeResult = true;
      }
      if (y < 0) {
        y = -y; // We rely on overflow behavior here
        negativeResult = !negativeResult;
      }
      uint128 absoluteResult = divuu (uint256 (x), uint256 (y));
      if (negativeResult) {
        require (absoluteResult <= 0x80000000000000000000000000000000);
        return -int128 (absoluteResult); // We rely on overflow behavior here
      } else {
        require (absoluteResult <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
        return int128 (absoluteResult); // We rely on overflow behavior here
      }
    }
  }

  /**
   * Calculate x / y rounding towards zero, where x and y are unsigned 256-bit
   * integer numbers.  Revert on overflow or when y is zero.
   *
   * @param x unsigned 256-bit integer number
   * @param y unsigned 256-bit integer number
   * @return signed 64.64-bit fixed point number
   */
  function divu (uint256 x, uint256 y) internal pure returns (int128) {
    unchecked {
      require (y != 0);
      uint128 result = divuu (x, y);
      require (result <= uint128 (MAX_64x64));
      return int128 (result);
    }
  }

  /**
   * Calculate -x.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function neg (int128 x) internal pure returns (int128) {
    unchecked {
      require (x != MIN_64x64);
      return -x;
    }
  }

  /**
   * Calculate |x|.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function abs (int128 x) internal pure returns (int128) {
    unchecked {
      require (x != MIN_64x64);
      return x < 0 ? -x : x;
    }
  }

  /**
   * Calculate 1 / x rounding towards zero.  Revert on overflow or when x is
   * zero.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function inv (int128 x) internal pure returns (int128) {
    unchecked {
      require (x != 0);
      int256 result = int256 (0x100000000000000000000000000000000) / x;
      require (result >= MIN_64x64 && result <= MAX_64x64);
      return int128 (result);
    }
  }

  /**
   * Calculate arithmetics average of x and y, i.e. (x + y) / 2 rounding down.
   *
   * @param x signed 64.64-bit fixed point number
   * @param y signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function avg (int128 x, int128 y) internal pure returns (int128) {
    unchecked {
      return int128 ((int256 (x) + int256 (y)) >> 1);
    }
  }

  /**
   * Calculate geometric average of x and y, i.e. sqrt (x * y) rounding down.
   * Revert on overflow or in case x * y is negative.
   *
   * @param x signed 64.64-bit fixed point number
   * @param y signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function gavg (int128 x, int128 y) internal pure returns (int128) {
    unchecked {
      int256 m = int256 (x) * int256 (y);
      require (m >= 0);
      require (m <
          0x4000000000000000000000000000000000000000000000000000000000000000);
      return int128 (sqrtu (uint256 (m)));
    }
  }

  /**
   * Calculate x^y assuming 0^0 is 1, where x is signed 64.64 fixed point number
   * and y is unsigned 256-bit integer number.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @param y uint256 value
   * @return signed 64.64-bit fixed point number
   */
  function pow (int128 x, uint256 y) internal pure returns (int128) {
    unchecked {
      bool negative = x < 0 && y & 1 == 1;

      uint256 absX = uint128 (x < 0 ? -x : x);
      uint256 absResult;
      absResult = 0x100000000000000000000000000000000;

      if (absX <= 0x10000000000000000) {
        absX <<= 63;
        while (y != 0) {
          if (y & 0x1 != 0) {
            absResult = absResult * absX >> 127;
          }
          absX = absX * absX >> 127;

          if (y & 0x2 != 0) {
            absResult = absResult * absX >> 127;
          }
          absX = absX * absX >> 127;

          if (y & 0x4 != 0) {
            absResult = absResult * absX >> 127;
          }
          absX = absX * absX >> 127;

          if (y & 0x8 != 0) {
            absResult = absResult * absX >> 127;
          }
          absX = absX * absX >> 127;

          y >>= 4;
        }

        absResult >>= 64;
      } else {
        uint256 absXShift = 63;
        if (absX < 0x1000000000000000000000000) { absX <<= 32; absXShift -= 32; }
        if (absX < 0x10000000000000000000000000000) { absX <<= 16; absXShift -= 16; }
        if (absX < 0x1000000000000000000000000000000) { absX <<= 8; absXShift -= 8; }
        if (absX < 0x10000000000000000000000000000000) { absX <<= 4; absXShift -= 4; }
        if (absX < 0x40000000000000000000000000000000) { absX <<= 2; absXShift -= 2; }
        if (absX < 0x80000000000000000000000000000000) { absX <<= 1; absXShift -= 1; }

        uint256 resultShift = 0;
        while (y != 0) {
          require (absXShift < 64);

          if (y & 0x1 != 0) {
            absResult = absResult * absX >> 127;
            resultShift += absXShift;
            if (absResult > 0x100000000000000000000000000000000) {
              absResult >>= 1;
              resultShift += 1;
            }
          }
          absX = absX * absX >> 127;
          absXShift <<= 1;
          if (absX >= 0x100000000000000000000000000000000) {
              absX >>= 1;
              absXShift += 1;
          }

          y >>= 1;
        }

        require (resultShift < 64);
        absResult >>= 64 - resultShift;
      }
      int256 result = negative ? -int256 (absResult) : int256 (absResult);
      require (result >= MIN_64x64 && result <= MAX_64x64);
      return int128 (result);
    }
  }

  /**
   * Calculate sqrt (x) rounding down.  Revert if x < 0.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function sqrt (int128 x) internal pure returns (int128) {
    unchecked {
      require (x >= 0);
      return int128 (sqrtu (uint256 (int256 (x)) << 64));
    }
  }

  /**
   * Calculate binary logarithm of x.  Revert if x <= 0.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function log_2 (int128 x) internal pure returns (int128) {
    unchecked {
      require (x > 0);

      int256 msb = 0;
      int256 xc = x;
      if (xc >= 0x10000000000000000) { xc >>= 64; msb += 64; }
      if (xc >= 0x100000000) { xc >>= 32; msb += 32; }
      if (xc >= 0x10000) { xc >>= 16; msb += 16; }
      if (xc >= 0x100) { xc >>= 8; msb += 8; }
      if (xc >= 0x10) { xc >>= 4; msb += 4; }
      if (xc >= 0x4) { xc >>= 2; msb += 2; }
      if (xc >= 0x2) msb += 1;  // No need to shift xc anymore

      int256 result = msb - 64 << 64;
      uint256 ux = uint256 (int256 (x)) << uint256 (127 - msb);
      for (int256 bit = 0x8000000000000000; bit > 0; bit >>= 1) {
        ux *= ux;
        uint256 b = ux >> 255;
        ux >>= 127 + b;
        result += bit * int256 (b);
      }

      return int128 (result);
    }
  }

  /**
   * Calculate natural logarithm of x.  Revert if x <= 0.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function ln (int128 x) internal pure returns (int128) {
    unchecked {
      require (x > 0);

      return int128 (int256 (
          uint256 (int256 (log_2 (x))) * 0xB17217F7D1CF79ABC9E3B39803F2F6AF >> 128));
    }
  }

  /**
   * Calculate binary exponent of x.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function exp_2 (int128 x) internal pure returns (int128) {
    unchecked {
      require (x < 0x400000000000000000); // Overflow

      if (x < -0x400000000000000000) return 0; // Underflow

      uint256 result = 0x80000000000000000000000000000000;

      if (x & 0x8000000000000000 > 0)
        result = result * 0x16A09E667F3BCC908B2FB1366EA957D3E >> 128;
      if (x & 0x4000000000000000 > 0)
        result = result * 0x1306FE0A31B7152DE8D5A46305C85EDEC >> 128;
      if (x & 0x2000000000000000 > 0)
        result = result * 0x1172B83C7D517ADCDF7C8C50EB14A791F >> 128;
      if (x & 0x1000000000000000 > 0)
        result = result * 0x10B5586CF9890F6298B92B71842A98363 >> 128;
      if (x & 0x800000000000000 > 0)
        result = result * 0x1059B0D31585743AE7C548EB68CA417FD >> 128;
      if (x & 0x400000000000000 > 0)
        result = result * 0x102C9A3E778060EE6F7CACA4F7A29BDE8 >> 128;
      if (x & 0x200000000000000 > 0)
        result = result * 0x10163DA9FB33356D84A66AE336DCDFA3F >> 128;
      if (x & 0x100000000000000 > 0)
        result = result * 0x100B1AFA5ABCBED6129AB13EC11DC9543 >> 128;
      if (x & 0x80000000000000 > 0)
        result = result * 0x10058C86DA1C09EA1FF19D294CF2F679B >> 128;
      if (x & 0x40000000000000 > 0)
        result = result * 0x1002C605E2E8CEC506D21BFC89A23A00F >> 128;
      if (x & 0x20000000000000 > 0)
        result = result * 0x100162F3904051FA128BCA9C55C31E5DF >> 128;
      if (x & 0x10000000000000 > 0)
        result = result * 0x1000B175EFFDC76BA38E31671CA939725 >> 128;
      if (x & 0x8000000000000 > 0)
        result = result * 0x100058BA01FB9F96D6CACD4B180917C3D >> 128;
      if (x & 0x4000000000000 > 0)
        result = result * 0x10002C5CC37DA9491D0985C348C68E7B3 >> 128;
      if (x & 0x2000000000000 > 0)
        result = result * 0x1000162E525EE054754457D5995292026 >> 128;
      if (x & 0x1000000000000 > 0)
        result = result * 0x10000B17255775C040618BF4A4ADE83FC >> 128;
      if (x & 0x800000000000 > 0)
        result = result * 0x1000058B91B5BC9AE2EED81E9B7D4CFAB >> 128;
      if (x & 0x400000000000 > 0)
        result = result * 0x100002C5C89D5EC6CA4D7C8ACC017B7C9 >> 128;
      if (x & 0x200000000000 > 0)
        result = result * 0x10000162E43F4F831060E02D839A9D16D >> 128;
      if (x & 0x100000000000 > 0)
        result = result * 0x100000B1721BCFC99D9F890EA06911763 >> 128;
      if (x & 0x80000000000 > 0)
        result = result * 0x10000058B90CF1E6D97F9CA14DBCC1628 >> 128;
      if (x & 0x40000000000 > 0)
        result = result * 0x1000002C5C863B73F016468F6BAC5CA2B >> 128;
      if (x & 0x20000000000 > 0)
        result = result * 0x100000162E430E5A18F6119E3C02282A5 >> 128;
      if (x & 0x10000000000 > 0)
        result = result * 0x1000000B1721835514B86E6D96EFD1BFE >> 128;
      if (x & 0x8000000000 > 0)
        result = result * 0x100000058B90C0B48C6BE5DF846C5B2EF >> 128;
      if (x & 0x4000000000 > 0)
        result = result * 0x10000002C5C8601CC6B9E94213C72737A >> 128;
      if (x & 0x2000000000 > 0)
        result = result * 0x1000000162E42FFF037DF38AA2B219F06 >> 128;
      if (x & 0x1000000000 > 0)
        result = result * 0x10000000B17217FBA9C739AA5819F44F9 >> 128;
      if (x & 0x800000000 > 0)
        result = result * 0x1000000058B90BFCDEE5ACD3C1CEDC823 >> 128;
      if (x & 0x400000000 > 0)
        result = result * 0x100000002C5C85FE31F35A6A30DA1BE50 >> 128;
      if (x & 0x200000000 > 0)
        result = result * 0x10000000162E42FF0999CE3541B9FFFCF >> 128;
      if (x & 0x100000000 > 0)
        result = result * 0x100000000B17217F80F4EF5AADDA45554 >> 128;
      if (x & 0x80000000 > 0)
        result = result * 0x10000000058B90BFBF8479BD5A81B51AD >> 128;
      if (x & 0x40000000 > 0)
        result = result * 0x1000000002C5C85FDF84BD62AE30A74CC >> 128;
      if (x & 0x20000000 > 0)
        result = result * 0x100000000162E42FEFB2FED257559BDAA >> 128;
      if (x & 0x10000000 > 0)
        result = result * 0x1000000000B17217F7D5A7716BBA4A9AE >> 128;
      if (x & 0x8000000 > 0)
        result = result * 0x100000000058B90BFBE9DDBAC5E109CCE >> 128;
      if (x & 0x4000000 > 0)
        result = result * 0x10000000002C5C85FDF4B15DE6F17EB0D >> 128;
      if (x & 0x2000000 > 0)
        result = result * 0x1000000000162E42FEFA494F1478FDE05 >> 128;
      if (x & 0x1000000 > 0)
        result = result * 0x10000000000B17217F7D20CF927C8E94C >> 128;
      if (x & 0x800000 > 0)
        result = result * 0x1000000000058B90BFBE8F71CB4E4B33D >> 128;
      if (x & 0x400000 > 0)
        result = result * 0x100000000002C5C85FDF477B662B26945 >> 128;
      if (x & 0x200000 > 0)
        result = result * 0x10000000000162E42FEFA3AE53369388C >> 128;
      if (x & 0x100000 > 0)
        result = result * 0x100000000000B17217F7D1D351A389D40 >> 128;
      if (x & 0x80000 > 0)
        result = result * 0x10000000000058B90BFBE8E8B2D3D4EDE >> 128;
      if (x & 0x40000 > 0)
        result = result * 0x1000000000002C5C85FDF4741BEA6E77E >> 128;
      if (x & 0x20000 > 0)
        result = result * 0x100000000000162E42FEFA39FE95583C2 >> 128;
      if (x & 0x10000 > 0)
        result = result * 0x1000000000000B17217F7D1CFB72B45E1 >> 128;
      if (x & 0x8000 > 0)
        result = result * 0x100000000000058B90BFBE8E7CC35C3F0 >> 128;
      if (x & 0x4000 > 0)
        result = result * 0x10000000000002C5C85FDF473E242EA38 >> 128;
      if (x & 0x2000 > 0)
        result = result * 0x1000000000000162E42FEFA39F02B772C >> 128;
      if (x & 0x1000 > 0)
        result = result * 0x10000000000000B17217F7D1CF7D83C1A >> 128;
      if (x & 0x800 > 0)
        result = result * 0x1000000000000058B90BFBE8E7BDCBE2E >> 128;
      if (x & 0x400 > 0)
        result = result * 0x100000000000002C5C85FDF473DEA871F >> 128;
      if (x & 0x200 > 0)
        result = result * 0x10000000000000162E42FEFA39EF44D91 >> 128;
      if (x & 0x100 > 0)
        result = result * 0x100000000000000B17217F7D1CF79E949 >> 128;
      if (x & 0x80 > 0)
        result = result * 0x10000000000000058B90BFBE8E7BCE544 >> 128;
      if (x & 0x40 > 0)
        result = result * 0x1000000000000002C5C85FDF473DE6ECA >> 128;
      if (x & 0x20 > 0)
        result = result * 0x100000000000000162E42FEFA39EF366F >> 128;
      if (x & 0x10 > 0)
        result = result * 0x1000000000000000B17217F7D1CF79AFA >> 128;
      if (x & 0x8 > 0)
        result = result * 0x100000000000000058B90BFBE8E7BCD6D >> 128;
      if (x & 0x4 > 0)
        result = result * 0x10000000000000002C5C85FDF473DE6B2 >> 128;
      if (x & 0x2 > 0)
        result = result * 0x1000000000000000162E42FEFA39EF358 >> 128;
      if (x & 0x1 > 0)
        result = result * 0x10000000000000000B17217F7D1CF79AB >> 128;

      result >>= uint256 (int256 (63 - (x >> 64)));
      require (result <= uint256 (int256 (MAX_64x64)));

      return int128 (int256 (result));
    }
  }

  /**
   * Calculate natural exponent of x.  Revert on overflow.
   *
   * @param x signed 64.64-bit fixed point number
   * @return signed 64.64-bit fixed point number
   */
  function exp (int128 x) internal pure returns (int128) {
    unchecked {
      require (x < 0x400000000000000000); // Overflow

      if (x < -0x400000000000000000) return 0; // Underflow

      return exp_2 (
          int128 (int256 (x) * 0x171547652B82FE1777D0FFDA0D23A7D12 >> 128));
    }
  }

  /**
   * Calculate x / y rounding towards zero, where x and y are unsigned 256-bit
   * integer numbers.  Revert on overflow or when y is zero.
   *
   * @param x unsigned 256-bit integer number
   * @param y unsigned 256-bit integer number
   * @return unsigned 64.64-bit fixed point number
   */
  function divuu (uint256 x, uint256 y) private pure returns (uint128) {
    unchecked {
      require (y != 0);

      uint256 result;

      if (x <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)
        result = (x << 64) / y;
      else {
        uint256 msb = 192;
        uint256 xc = x >> 192;
        if (xc >= 0x100000000) { xc >>= 32; msb += 32; }
        if (xc >= 0x10000) { xc >>= 16; msb += 16; }
        if (xc >= 0x100) { xc >>= 8; msb += 8; }
        if (xc >= 0x10) { xc >>= 4; msb += 4; }
        if (xc >= 0x4) { xc >>= 2; msb += 2; }
        if (xc >= 0x2) msb += 1;  // No need to shift xc anymore

        result = (x << 255 - msb) / ((y - 1 >> msb - 191) + 1);
        require (result <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);

        uint256 hi = result * (y >> 128);
        uint256 lo = result * (y & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);

        uint256 xh = x >> 192;
        uint256 xl = x << 64;

        if (xl < lo) xh -= 1;
        xl -= lo; // We rely on overflow behavior here
        lo = hi << 128;
        if (xl < lo) xh -= 1;
        xl -= lo; // We rely on overflow behavior here

        assert (xh == hi >> 128);

        result += xl / y;
      }

      require (result <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
      return uint128 (result);
    }
  }

  /**
   * Calculate sqrt (x) rounding down, where x is unsigned 256-bit integer
   * number.
   *
   * @param x unsigned 256-bit integer number
   * @return unsigned 128-bit integer number
   */
  function sqrtu (uint256 x) private pure returns (uint128) {
    unchecked {
      if (x == 0) return 0;
      else {
        uint256 xx = x;
        uint256 r = 1;
        if (xx >= 0x100000000000000000000000000000000) { xx >>= 128; r <<= 64; }
        if (xx >= 0x10000000000000000) { xx >>= 64; r <<= 32; }
        if (xx >= 0x100000000) { xx >>= 32; r <<= 16; }
        if (xx >= 0x10000) { xx >>= 16; r <<= 8; }
        if (xx >= 0x100) { xx >>= 8; r <<= 4; }
        if (xx >= 0x10) { xx >>= 4; r <<= 2; }
        if (xx >= 0x4) { r <<= 1; }
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1; // Seven iterations should be enough
        uint256 r1 = x / r;
        return uint128 (r < r1 ? r : r1);
      }
    }
  }
}

File 18 of 38 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 19 of 38 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

File 20 of 38 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // 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);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

File 21 of 38 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 22 of 38 : Base64.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Base64.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides a set of functions to operate with Base64 strings.
 *
 * _Available since v4.5._
 */
library Base64 {
    /**
     * @dev Base64 Encoding/Decoding Table
     */
    string internal constant _TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /**
     * @dev Converts a `bytes` to its Bytes64 `string` representation.
     */
    function encode(bytes memory data) internal pure returns (string memory) {
        /**
         * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence
         * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol
         */
        if (data.length == 0) return "";

        // Loads the table into memory
        string memory table = _TABLE;

        // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter
        // and split into 4 numbers of 6 bits.
        // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up
        // - `data.length + 2`  -> Round up
        // - `/ 3`              -> Number of 3-bytes chunks
        // - `4 *`              -> 4 characters for each chunk
        string memory result = new string(4 * ((data.length + 2) / 3));

        /// @solidity memory-safe-assembly
        assembly {
            // Prepare the lookup table (skip the first "length" byte)
            let tablePtr := add(table, 1)

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

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

            } {
                // Advance 3 bytes
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)

                // To write each character, shift the 3 bytes (18 bits) chunk
                // 4 times in blocks of 6 bits for each character (18, 12, 6, 0)
                // and apply logical AND with 0x3F which is the number of
                // the previous character in the ASCII table prior to the Base64 Table
                // The result is then added to the table to get the character to write,
                // and finally write it in the result pointer but with a left shift
                // of 256 (1 byte) - 8 (1 ASCII char) = 248 bits

                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance
            }

            // When data `bytes` is not exactly 3 bytes long
            // it is padded with `=` characters at the end
            switch mod(mload(data), 3)
            case 1 {
                mstore8(sub(resultPtr, 1), 0x3d)
                mstore8(sub(resultPtr, 2), 0x3d)
            }
            case 2 {
                mstore8(sub(resultPtr, 1), 0x3d)
            }
        }

        return result;
    }
}

File 23 of 38 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return 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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 24 of 38 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

File 25 of 38 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

File 26 of 38 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: 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 Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

File 27 of 38 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

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: address zero is not a valid owner");
        return _balances[owner];
    }

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

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner nor approved for all"
        );

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

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

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner 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: caller is not token 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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

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

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

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

        _afterTokenTransfer(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);

        _afterTokenTransfer(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 from incorrect owner");
        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);

        _afterTokenTransfer(from, to, tokenId);
    }

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

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 28 of 38 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 29 of 38 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

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

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

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

File 30 of 38 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens 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 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 31 of 38 : IERC2981.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;

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

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

File 32 of 38 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol)

pragma solidity ^0.8.0;

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

File 33 of 38 : IStakingToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IStakingToken {
    event Staked(address indexed user, uint256 amount, uint256 term);

    event Withdrawn(address indexed user, uint256 amount, uint256 reward);

    function stake(uint256 amount, uint256 term) external;

    function withdraw() external;
}

File 34 of 38 : IRankedMintingToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IRankedMintingToken {
    event RankClaimed(address indexed user, uint256 term, uint256 rank);

    event MintClaimed(address indexed user, uint256 rewardAmount);

    function claimRank(uint256 term) external;

    function claimMintReward() external;
}

File 35 of 38 : IBurnableToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IBurnableToken {
    function burn(address user, uint256 amount) external;
}

File 36 of 38 : IBurnRedeemable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IBurnRedeemable {
    event Redeemed(
        address indexed user,
        address indexed xenContract,
        address indexed tokenContract,
        uint256 xenAmount,
        uint256 tokenAmount
    );

    function onTokenBurned(address user, uint256 amount) external;
}

File 37 of 38 : XENCrypto.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "./Math.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/interfaces/IERC165.sol";
import "abdk-libraries-solidity/ABDKMath64x64.sol";
import "./interfaces/IStakingToken.sol";
import "./interfaces/IRankedMintingToken.sol";
import "./interfaces/IBurnableToken.sol";
import "./interfaces/IBurnRedeemable.sol";

contract XENCrypto is Context, IRankedMintingToken, IStakingToken, IBurnableToken, ERC20("XEN Crypto", "XEN") {
    using Math for uint256;
    using ABDKMath64x64 for int128;
    using ABDKMath64x64 for uint256;

    // INTERNAL TYPE TO DESCRIBE A XEN MINT INFO
    struct MintInfo {
        address user;
        uint256 term;
        uint256 maturityTs;
        uint256 rank;
        uint256 amplifier;
        uint256 eaaRate;
    }

    // INTERNAL TYPE TO DESCRIBE A XEN STAKE
    struct StakeInfo {
        uint256 term;
        uint256 maturityTs;
        uint256 amount;
        uint256 apy;
    }

    // PUBLIC CONSTANTS

    uint256 public constant SECONDS_IN_DAY = 3_600 * 24;
    uint256 public constant DAYS_IN_YEAR = 365;

    uint256 public constant GENESIS_RANK = 1;

    uint256 public constant MIN_TERM = 1 * SECONDS_IN_DAY - 1;
    uint256 public constant MAX_TERM_START = 100 * SECONDS_IN_DAY;
    uint256 public constant MAX_TERM_END = 1_000 * SECONDS_IN_DAY;
    uint256 public constant TERM_AMPLIFIER = 15;
    uint256 public constant TERM_AMPLIFIER_THRESHOLD = 5_000;
    uint256 public constant REWARD_AMPLIFIER_START = 3_000;
    uint256 public constant REWARD_AMPLIFIER_END = 1;
    uint256 public constant EAA_PM_START = 100;
    uint256 public constant EAA_PM_STEP = 1;
    uint256 public constant EAA_RANK_STEP = 100_000;
    uint256 public constant WITHDRAWAL_WINDOW_DAYS = 7;
    uint256 public constant MAX_PENALTY_PCT = 99;

    uint256 public constant XEN_MIN_STAKE = 0;

    uint256 public constant XEN_MIN_BURN = 0;

    uint256 public constant XEN_APY_START = 20;
    uint256 public constant XEN_APY_DAYS_STEP = 90;
    uint256 public constant XEN_APY_END = 2;

    string public constant AUTHORS = "@MrJackLevin @lbelyaev faircrypto.org";

    // PUBLIC STATE, READABLE VIA NAMESAKE GETTERS

    uint256 public immutable genesisTs;
    uint256 public globalRank = GENESIS_RANK;
    uint256 public activeMinters;
    uint256 public activeStakes;
    uint256 public totalXenStaked;
    // user address => XEN mint info
    mapping(address => MintInfo) public userMints;
    // user address => XEN stake info
    mapping(address => StakeInfo) public userStakes;
    // user address => XEN burn amount
    mapping(address => uint256) public userBurns;

    // CONSTRUCTOR
    constructor() {
        genesisTs = block.timestamp;
    }

    // PRIVATE METHODS

    /**
     * @dev calculates current MaxTerm based on Global Rank
     *      (if Global Rank crosses over TERM_AMPLIFIER_THRESHOLD)
     */
    function _calculateMaxTerm() private view returns (uint256) {
        if (globalRank > TERM_AMPLIFIER_THRESHOLD) {
            uint256 delta = globalRank.fromUInt().log_2().mul(TERM_AMPLIFIER.fromUInt()).toUInt();
            uint256 newMax = MAX_TERM_START + delta * SECONDS_IN_DAY;
            return Math.min(newMax, MAX_TERM_END);
        }
        return MAX_TERM_START;
    }

    /**
     * @dev calculates Withdrawal Penalty depending on lateness
     */
    function _penalty(uint256 secsLate) private pure returns (uint256) {
        // =MIN(2^(daysLate+3)/window-1,99)
        uint256 daysLate = secsLate / SECONDS_IN_DAY;
        if (daysLate > WITHDRAWAL_WINDOW_DAYS - 1) return MAX_PENALTY_PCT;
        uint256 penalty = (uint256(1) << (daysLate + 3)) / WITHDRAWAL_WINDOW_DAYS - 1;
        return Math.min(penalty, MAX_PENALTY_PCT);
    }

    /**
     * @dev calculates net Mint Reward (adjusted for Penalty)
     */
    function _calculateMintReward(
        uint256 cRank,
        uint256 term,
        uint256 maturityTs,
        uint256 amplifier,
        uint256 eeaRate
    ) private view returns (uint256) {
        uint256 secsLate = block.timestamp - maturityTs;
        uint256 penalty = _penalty(secsLate);
        uint256 rankDelta = Math.max(globalRank - cRank, 2);
        uint256 EAA = (1_000 + eeaRate);
        uint256 reward = getGrossReward(rankDelta, amplifier, term, EAA);
        return (reward * (100 - penalty)) / 100;
    }

    /**
     * @dev cleans up User Mint storage (gets some Gas credit;))
     */
    function _cleanUpUserMint() private {
        delete userMints[_msgSender()];
        activeMinters--;
    }

    /**
     * @dev calculates XEN Stake Reward
     */
    function _calculateStakeReward(
        uint256 amount,
        uint256 term,
        uint256 maturityTs,
        uint256 apy
    ) private view returns (uint256) {
        if (block.timestamp > maturityTs) {
            uint256 rate = (apy * term * 1_000_000) / DAYS_IN_YEAR;
            return (amount * rate) / 100_000_000;
        }
        return 0;
    }

    /**
     * @dev calculates Reward Amplifier
     */
    function _calculateRewardAmplifier() private view returns (uint256) {
        uint256 amplifierDecrease = (block.timestamp - genesisTs) / SECONDS_IN_DAY;
        if (amplifierDecrease < REWARD_AMPLIFIER_START) {
            return Math.max(REWARD_AMPLIFIER_START - amplifierDecrease, REWARD_AMPLIFIER_END);
        } else {
            return REWARD_AMPLIFIER_END;
        }
    }

    /**
     * @dev calculates Early Adopter Amplifier Rate (in 1/000ths)
     *      actual EAA is (1_000 + EAAR) / 1_000
     */
    function _calculateEAARate() private view returns (uint256) {
        uint256 decrease = (EAA_PM_STEP * globalRank) / EAA_RANK_STEP;
        if (decrease > EAA_PM_START) return 0;
        return EAA_PM_START - decrease;
    }

    /**
     * @dev calculates APY (in %)
     */
    function _calculateAPY() private view returns (uint256) {
        uint256 decrease = (block.timestamp - genesisTs) / (SECONDS_IN_DAY * XEN_APY_DAYS_STEP);
        if (XEN_APY_START - XEN_APY_END < decrease) return XEN_APY_END;
        return XEN_APY_START - decrease;
    }

    /**
     * @dev creates User Stake
     */
    function _createStake(uint256 amount, uint256 term) private {
        userStakes[_msgSender()] = StakeInfo({
            term: term,
            maturityTs: block.timestamp + term * SECONDS_IN_DAY,
            amount: amount,
            apy: _calculateAPY()
        });
        activeStakes++;
        totalXenStaked += amount;
    }

    // PUBLIC CONVENIENCE GETTERS

    /**
     * @dev calculates gross Mint Reward
     */
    function getGrossReward(
        uint256 rankDelta,
        uint256 amplifier,
        uint256 term,
        uint256 eaa
    ) public pure returns (uint256) {
        int128 log128 = rankDelta.fromUInt().log_2();
        int128 reward128 = log128.mul(amplifier.fromUInt()).mul(term.fromUInt()).mul(eaa.fromUInt());
        return reward128.div(uint256(1_000).fromUInt()).toUInt();
    }

    /**
     * @dev returns User Mint object associated with User account address
     */
    function getUserMint() external view returns (MintInfo memory) {
        return userMints[_msgSender()];
    }

    /**
     * @dev returns XEN Stake object associated with User account address
     */
    function getUserStake() external view returns (StakeInfo memory) {
        return userStakes[_msgSender()];
    }

    /**
     * @dev returns current AMP
     */
    function getCurrentAMP() external view returns (uint256) {
        return _calculateRewardAmplifier();
    }

    /**
     * @dev returns current EAA Rate
     */
    function getCurrentEAAR() external view returns (uint256) {
        return _calculateEAARate();
    }

    /**
     * @dev returns current APY
     */
    function getCurrentAPY() external view returns (uint256) {
        return _calculateAPY();
    }

    /**
     * @dev returns current MaxTerm
     */
    function getCurrentMaxTerm() external view returns (uint256) {
        return _calculateMaxTerm();
    }

    // PUBLIC STATE-CHANGING METHODS

    /**
     * @dev accepts User cRank claim provided all checks pass (incl. no current claim exists)
     */
    function claimRank(uint256 term) external {
        uint256 termSec = term * SECONDS_IN_DAY;
        require(termSec > MIN_TERM, "CRank: Term less than min");
        require(termSec < _calculateMaxTerm() + 1, "CRank: Term more than current max term");
        require(userMints[_msgSender()].rank == 0, "CRank: Mint already in progress");

        // create and store new MintInfo
        MintInfo memory mintInfo = MintInfo({
            user: _msgSender(),
            term: term,
            maturityTs: block.timestamp + termSec,
            rank: globalRank,
            amplifier: _calculateRewardAmplifier(),
            eaaRate: _calculateEAARate()
        });
        userMints[_msgSender()] = mintInfo;
        activeMinters++;
        emit RankClaimed(_msgSender(), term, globalRank++);
    }

    /**
     * @dev ends minting upon maturity (and within permitted Withdrawal Time Window), gets minted XEN
     */
    function claimMintReward() external {
        MintInfo memory mintInfo = userMints[_msgSender()];
        require(mintInfo.rank > 0, "CRank: No mint exists");
        require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached");

        // calculate reward and mint tokens
        uint256 rewardAmount = _calculateMintReward(
            mintInfo.rank,
            mintInfo.term,
            mintInfo.maturityTs,
            mintInfo.amplifier,
            mintInfo.eaaRate
        ) * 1 ether;
        _mint(_msgSender(), rewardAmount);

        _cleanUpUserMint();
        emit MintClaimed(_msgSender(), rewardAmount);
    }

    /**
     * @dev  ends minting upon maturity (and within permitted Withdrawal time Window)
     *       mints XEN coins and splits them between User and designated other address
     */
    function claimMintRewardAndShare(address other, uint256 pct) external {
        MintInfo memory mintInfo = userMints[_msgSender()];
        require(other != address(0), "CRank: Cannot share with zero address");
        require(pct > 0, "CRank: Cannot share zero percent");
        require(pct < 101, "CRank: Cannot share 100+ percent");
        require(mintInfo.rank > 0, "CRank: No mint exists");
        require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached");

        // calculate reward
        uint256 rewardAmount = _calculateMintReward(
            mintInfo.rank,
            mintInfo.term,
            mintInfo.maturityTs,
            mintInfo.amplifier,
            mintInfo.eaaRate
        ) * 1 ether;
        uint256 sharedReward = (rewardAmount * pct) / 100;
        uint256 ownReward = rewardAmount - sharedReward;

        // mint reward tokens
        _mint(_msgSender(), ownReward);
        _mint(other, sharedReward);

        _cleanUpUserMint();
        emit MintClaimed(_msgSender(), rewardAmount);
    }

    /**
     * @dev  ends minting upon maturity (and within permitted Withdrawal time Window)
     *       mints XEN coins and stakes 'pct' of it for 'term'
     */
    function claimMintRewardAndStake(uint256 pct, uint256 term) external {
        MintInfo memory mintInfo = userMints[_msgSender()];
        // require(pct > 0, "CRank: Cannot share zero percent");
        require(pct < 101, "CRank: Cannot share >100 percent");
        require(mintInfo.rank > 0, "CRank: No mint exists");
        require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached");

        // calculate reward
        uint256 rewardAmount = _calculateMintReward(
            mintInfo.rank,
            mintInfo.term,
            mintInfo.maturityTs,
            mintInfo.amplifier,
            mintInfo.eaaRate
        ) * 1 ether;
        uint256 stakedReward = (rewardAmount * pct) / 100;
        uint256 ownReward = rewardAmount - stakedReward;

        // mint reward tokens part
        _mint(_msgSender(), ownReward);
        _cleanUpUserMint();
        emit MintClaimed(_msgSender(), rewardAmount);

        // nothing to burn since we haven't minted this part yet
        // stake extra tokens part
        require(stakedReward > XEN_MIN_STAKE, "XEN: Below min stake");
        require(term * SECONDS_IN_DAY > MIN_TERM, "XEN: Below min stake term");
        require(term * SECONDS_IN_DAY < MAX_TERM_END + 1, "XEN: Above max stake term");
        require(userStakes[_msgSender()].amount == 0, "XEN: stake exists");

        _createStake(stakedReward, term);
        emit Staked(_msgSender(), stakedReward, term);
    }

    /**
     * @dev initiates XEN Stake in amount for a term (days)
     */
    function stake(uint256 amount, uint256 term) external {
        require(balanceOf(_msgSender()) >= amount, "XEN: not enough balance");
        require(amount > XEN_MIN_STAKE, "XEN: Below min stake");
        require(term * SECONDS_IN_DAY > MIN_TERM, "XEN: Below min stake term");
        require(term * SECONDS_IN_DAY < MAX_TERM_END + 1, "XEN: Above max stake term");
        require(userStakes[_msgSender()].amount == 0, "XEN: stake exists");

        // burn staked XEN
        _burn(_msgSender(), amount);
        // create XEN Stake
        _createStake(amount, term);
        emit Staked(_msgSender(), amount, term);
    }

    /**
     * @dev ends XEN Stake and gets reward if the Stake is mature
     */
    function withdraw() external {
        StakeInfo memory userStake = userStakes[_msgSender()];
        require(userStake.amount > 0, "XEN: no stake exists");

        uint256 xenReward = _calculateStakeReward(
            userStake.amount,
            userStake.term,
            userStake.maturityTs,
            userStake.apy
        );
        activeStakes--;
        totalXenStaked -= userStake.amount;

        // mint staked XEN (+ reward)
        _mint(_msgSender(), userStake.amount + xenReward);
        emit Withdrawn(_msgSender(), userStake.amount, xenReward);
        delete userStakes[_msgSender()];
    }

    /**
     * @dev burns XEN tokens and creates Proof-Of-Burn record to be used by connected DeFi services
     */
    function burn(address user, uint256 amount) public {
        require(amount > XEN_MIN_BURN, "Burn: Below min limit");
        require(
            IERC165(_msgSender()).supportsInterface(type(IBurnRedeemable).interfaceId),
            "Burn: not a supported contract"
        );

        _spendAllowance(user, _msgSender(), amount);
        _burn(user, amount);
        userBurns[user] += amount;
        IBurnRedeemable(_msgSender()).onTokenBurned(user, amount);
    }
}

File 38 of 38 : Math.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "abdk-libraries-solidity/ABDKMath64x64.sol";

library Math {

    function min(uint256 a, uint256 b) external pure returns (uint256) {
        if (a > b) return b;
        return a;
    }

    function max(uint256 a, uint256 b) external pure returns (uint256) {
        if (a > b) return a;
        return b;
    }

    function logX64(uint256 x) external pure returns (int128) {
        return ABDKMath64x64.log_2(ABDKMath64x64.fromUInt(x));
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 20
  },
  "evmVersion": "london",
  "libraries": {
    "/contracts/libs/MintInfo.sol": {
      "MintInfo": "0x1Ac17FFB8456525BfF46870bba7Ed8772ba063a5"
    },
    "/contracts/libs/Metadata.sol": {
      "Metadata": "0x0a252663DBCc0b073063D6420a40319e438Cfa59"
    }
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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ss","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":"uint256","name":"","type":"uint256"}],"name":"specialClassesBurnRates","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"specialClassesCounters","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"specialClassesTokenLimits","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startBlockNumber","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","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":"tokenIdCounter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"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":"uint256","name":"","type":"uint256"}],"name":"vmuCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"xenBurned","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"xenCrypto","outputs":[{"internalType":"contract XENCrypto","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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

000000000000000000000000eb585163debb1e637c6d617de3bef99347cd75c800000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000001c000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c73fc08c931efe3fce850c09278472e8a81c2e050000000000000000000000000000000000000000000000000000000000000007000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000014adf4b7320334b9000000000000000000000000000000000000000000000000295be96e6406697200000000000000000000000000000000000000000000000052b7d2dcc80cd2e4000000000000000000000000000000000000000000000000cecb8f27f4200f3a0000000000000000000000000000000000000000000000019d971e4fe8401e740000000000000000000000000000000000000000000000033b2e3c9fd0803ce8000000000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000271000000000000000000000000000000000000000000000000000000000000017700000000000000000000000000000000000000000000000000000000000000bb800000000000000000000000000000000000000000000000000000000000003e80000000000000000000000000000000000000000000000000000000000000064

-----Decoded View---------------
Arg [0] : xenCrypto_ (address): 0xeB585163DEbB1E637c6D617de3bEF99347cd75c8
Arg [1] : burnRates_ (uint256[]): 0,25000000000000000000000000,50000000000000000000000000,100000000000000000000000000,250000000000000000000000000,500000000000000000000000000,1000000000000000000000000000
Arg [2] : tokenLimits_ (uint256[]): 0,0,10000,6000,3000,1000,100
Arg [3] : startBlockNumber_ (uint256): 0
Arg [4] : forwarder_ (address): 0x0000000000000000000000000000000000000000
Arg [5] : royaltyReceiver_ (address): 0xC73Fc08C931Efe3FCE850C09278472e8a81c2e05

-----Encoded View---------------
22 Constructor Arguments found :
Arg [0] : 000000000000000000000000eb585163debb1e637c6d617de3bef99347cd75c8
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 00000000000000000000000000000000000000000000000000000000000001c0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 000000000000000000000000c73fc08c931efe3fce850c09278472e8a81c2e05
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [8] : 00000000000000000000000000000000000000000014adf4b7320334b9000000
Arg [9] : 000000000000000000000000000000000000000000295be96e64066972000000
Arg [10] : 00000000000000000000000000000000000000000052b7d2dcc80cd2e4000000
Arg [11] : 000000000000000000000000000000000000000000cecb8f27f4200f3a000000
Arg [12] : 0000000000000000000000000000000000000000019d971e4fe8401e74000000
Arg [13] : 0000000000000000000000000000000000000000033b2e3c9fd0803ce8000000
Arg [14] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [15] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [16] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [17] : 0000000000000000000000000000000000000000000000000000000000002710
Arg [18] : 0000000000000000000000000000000000000000000000000000000000001770
Arg [19] : 0000000000000000000000000000000000000000000000000000000000000bb8
Arg [20] : 00000000000000000000000000000000000000000000000000000000000003e8
Arg [21] : 0000000000000000000000000000000000000000000000000000000000000064


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