ETH Price: $3,496.75 (+2.96%)

Token

ChainFaces Arena (ლ⚈෴⚈ლ)
 

Overview

Max Total Supply

26,969 ლ⚈෴⚈ლ

Holders

3,998

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A
Balance
6 ლ⚈෴⚈ლ
0x92de681d01132b4d393f93e774995197c986710b
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OVERVIEW

ChainFaces Arena is the much anticipated successor to the original on-chain generative ASCII text faces. The smart contract generator produces randomized faces which will be revealed once the timer runs out or the maximum number of faces are minted. The battle arena is part of the core experience, where ChainFaces can compete to become champion. Dying in the arena means the NFT is gone forever. ChainFaces which survive in the arena are rewarded by having their battle score updated in real time, as well as having the ability to earn generative scars with every 10 rounds survived.

# Exchange Pair Price  24H Volume % Volume

Contract Source Code Verified (Exact Match)

Contract Name:
ChainFaces2

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 16 : ChainFaces2.sol
// SPDX-License-Identifier: GPLv3

pragma solidity 0.8.7;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";

import "./ChainFaces2Renderer.sol";
import "./ChainFaces2Errors.sol";

contract ChainFaces2 is ERC721, ERC721Enumerable, Ownable {

    /*************************
     COMMON
     *************************/

    // Sale stage enum
    enum Stage {
        STAGE_COMPLETE,
        STAGE_PRESALE,
        STAGE_MAIN_SALE
    }

    bool balanceNotWithdrawn;

    constructor(uint256 _tokenLimit, uint256 _secretCommit, address _renderer, bytes32 _merkleRoot) ERC721("ChainFaces Arena", unicode"ლ⚈෴⚈ლ")  {
        tokenLimit = _tokenLimit;
        secret = _secretCommit;
        merkleRoot = _merkleRoot;
        balanceNotWithdrawn = true;

        // Start in presale stage
        stage = Stage.STAGE_PRESALE;

        renderer = ChainFaces2Renderer(_renderer);

        // Mint ancients
        for (uint256 i = 0; i < 10; i++) {
            _createFace();
        }
    }

    fallback() external payable {}

    /*************************
     TOKEN SALE
     *************************/

    Stage public               stage;
    uint256 public             saleEnds;
    uint256 public immutable   tokenLimit;

    // Merkle distributor values
    bytes32 immutable merkleRoot;
    mapping(uint256 => uint256) private claimedBitMap;

    uint256 public constant saleLength = 60 minutes;
    uint256 public constant salePrice = 0.069 ether;

    uint256 secret;             // Entropy supplied by owner (commit/reveal style)
    uint256 userSecret;         // Pseudorandom entropy provided by minters

    // -- MODIFIERS --

    modifier onlyMainSaleOpen() {
        if (stage != Stage.STAGE_MAIN_SALE || mainSaleComplete()) {
            revert SaleNotOpen();
        }
        _;
    }

    modifier onlyPreSale() {
        if (stage != Stage.STAGE_PRESALE) {
            revert NotPreSaleStage();
        }
        _;
    }

    modifier onlyMainSale() {
        if (stage != Stage.STAGE_MAIN_SALE) {
            revert NotMainSaleStage();
        }
        _;
    }

    modifier onlySaleComplete() {
        if (stage != Stage.STAGE_COMPLETE) {
            revert SaleNotComplete();
        }
        _;
    }

    // -- VIEW METHODS --

    function mainSaleComplete() public view returns (bool) {
        return block.timestamp >= saleEnds || totalSupply() == tokenLimit;
    }

    function isClaimed(uint256 index) public view returns (bool) {
        uint256 claimedWordIndex = index / 256;
        uint256 claimedBitIndex = index % 256;
        uint256 claimedWord = claimedBitMap[claimedWordIndex];
        uint256 mask = (1 << claimedBitIndex);
        return claimedWord & mask == mask;
    }

    // -- OWNER METHODS --

    // Reveal the faces
    function theGreatReveal(uint256 _secretReveal) external onlyOwner onlyMainSale {
        if (!mainSaleComplete()) {
            revert MainSaleNotComplete();
        }

        if (uint256(keccak256(abi.encodePacked(_secretReveal))) != secret) {
            revert InvalidReveal();
        }

        // Final secret is XOR between the pre-committed secret and the pseudo-random user contributed salt
        secret = _secretReveal ^ userSecret;

        // Won't be needing this anymore
        delete userSecret;

        stage = Stage.STAGE_COMPLETE;
    }

    // Start main sale
    function startMainSale() external onlyOwner onlyPreSale {
        stage = Stage.STAGE_MAIN_SALE;
        saleEnds = block.timestamp + saleLength;
    }

    // Withdraw sale proceeds
    function withdraw() external onlyOwner {
        // Owner can't reneg on bounty
        if (arenaActive()) {
            revert ArenaIsActive();
        }

        balanceNotWithdrawn = false;
        owner().call{value : address(this).balance}("");
    }

    // -- USER METHODS --

    function claim(uint256 _index, uint256 _ogAmount, uint256 _wlAmount, bytes32[] calldata _merkleProof, uint256 _amount) external payable onlyPreSale {
        // Ensure not already claimed
        if (isClaimed(_index)) {
            revert AlreadyClaimed();
        }

        // Prevent accidental claim of 0
        if (_amount == 0) {
            revert InvalidClaimAmount();
        }

        // Check claim amount
        uint256 total = _ogAmount + _wlAmount;
        if (_amount > total) {
            revert InvalidClaimAmount();
        }

        // Check claim value
        uint256 paidClaims = 0;
        if (_amount > _ogAmount) {
            paidClaims = _amount - _ogAmount;
        }
        if (msg.value < paidClaims * salePrice) {
            revert InvalidClaimValue();
        }

        // Verify the merkle proof
        bytes32 node = keccak256(abi.encodePacked(_index, msg.sender, _ogAmount, _wlAmount));
        if (!MerkleProof.verify(_merkleProof, merkleRoot, node)) {
            revert InvalidProof();
        }

        // Mark it claimed and mint
        _setClaimed(_index);

        for (uint256 i = 0; i < _amount; i++) {
            _createFace();
        }

        _mix();
    }

    // Mint faces
    function createFace() external payable onlyMainSaleOpen {
        uint256 count = msg.value / salePrice;

        if (count == 0) {
            revert InvalidMintValue();
        } else if (count > 20) {
            count = 20;
        }

        // Don't mint more than supply
        if (count + totalSupply() > tokenLimit) {
            count = tokenLimit - totalSupply();
        }

        // Mint 'em
        for (uint256 i = 0; i < count; i++) {
            _createFace();
        }

        _mix();

        // Send any excess ETH back to the caller
        uint256 excess = msg.value - (salePrice * count);
        if (excess > 0) {
            (bool success,) = msg.sender.call{value : excess}("");
            require(success);
        }
    }

    // -- INTERNAL METHODS --

    function _setClaimed(uint256 index) internal {
        uint256 claimedWordIndex = index / 256;
        uint256 claimedBitIndex = index % 256;
        claimedBitMap[claimedWordIndex] = claimedBitMap[claimedWordIndex] | (1 << claimedBitIndex);
    }

    function _createFace() internal {
        uint256 tokenId = totalSupply();
        _mint(msg.sender, tokenId);
    }

    function _mix() internal {
        // Add some pseudorandom value which will be mixed with the pre-committed secret
        unchecked {
            userSecret += uint256(blockhash(block.number - 1));
        }
    }

    /*************************
     NFT
     *************************/

    modifier onlyTokenExists(uint256 _id) {
        if (!_exists(_id)) {
            revert NonExistentToken();
        }
        _;
    }

    ChainFaces2Renderer public renderer;

    // -- VIEW METHODS --

    function assembleFace(uint256 _id) external view onlyTokenExists(_id) returns (string memory) {
        return renderer.assembleFace(stage == Stage.STAGE_COMPLETE, _id, getFinalizedSeed(_id));
    }

    function tokenURI(uint256 _id) public view override onlyTokenExists(_id) returns (string memory) {
        return renderer.renderMetadata(stage == Stage.STAGE_COMPLETE, _id, getFinalizedSeed(_id), roundsSurvived[_id], ownerOf(_id));
    }

    function renderSvg(uint256 _id) external view onlyTokenExists(_id) returns (string memory) {
        uint256 rounds;

        // If face is still in the arena, show them with correct amount of scars
        if (ownerOf(_id) == address(this)) {
            rounds = currentRound;
        } else {
            rounds = roundsSurvived[_id];
        }

        return renderer.renderSvg(stage == Stage.STAGE_COMPLETE, _id, getFinalizedSeed(_id), rounds, ownerOf(_id));
    }

    // -- INTERNAL METHODS --

    function getFinalizedSeed(uint256 _tokenId) internal view returns (uint256) {
        return uint256(keccak256(abi.encodePacked(secret, _tokenId)));
    }

    /*************************
     ARENA
     *************************/

    uint256     arenaOpenedBlock;
    uint256     lionsLastFeeding;
    uint256     champion;

    uint256 public currentRound = 0;

    address constant happyFacePlace = 0x7039D65E346FDEEBbc72514D718C88699c74ba4b;
    uint256 public constant arenaWaitBlocks = 6969;
    uint256 public constant blocksPerRound = 69;

    mapping(uint256 => address) warriorDepositor;
    mapping(uint256 => uint256) public roundsSurvived;

    // -- MODIFIERS --

    modifier onlyOpenArena() {
        if (!entryOpen()) {
            revert ArenaEntryClosed();
        }
        _;
    }

    // -- VIEW METHODS --

    struct ArenaInfo {
        uint256 fallen;
        uint256 alive;
        uint256 currentRound;
        uint256 bounty;
        uint256 hunger;
        uint256 nextFeed;
        uint256 champion;
        uint256 entryClosedBlock;
        bool hungry;
        bool open;
        bool active;
        bool gameOver;
    }

    function arenaInfo() external view returns (ArenaInfo memory info) {
        info.fallen = balanceOf(happyFacePlace);
        info.alive = balanceOf(address(this));
        info.currentRound = currentRound;
        info.bounty = address(this).balance;
        info.hunger = howHungryAreTheLions();
        info.champion = champion;
        info.entryClosedBlock = entryClosedBlock();

        if (!theLionsAreHungry()) {
            info.nextFeed = lionsLastFeeding + blocksPerRound - block.number;
        }

        info.hungry = theLionsAreHungry();
        info.open = entryOpen();
        info.active = arenaActive();
        info.gameOver = block.number > info.entryClosedBlock && info.alive <= 1;
    }

    // Return array of msg.senders warriors filtered by alive or fallen
    function myWarriors(bool _alive) external view returns (uint256[] memory) {
        return ownerWarriors(msg.sender, _alive);
    }

    // Return array of owner's warriors filtered by alive or fallen
    function ownerWarriors(address _owner, bool _alive) public view returns (uint256[] memory) {
        address holdingAddress;
        if (_alive) {
            holdingAddress = address(this);
        } else {
            holdingAddress = happyFacePlace;
        }

        uint256 total = balanceOf(holdingAddress);
        uint256[] memory warriors = new uint256[](total);

        uint256 index = 0;

        for (uint256 i = 0; i < total; i++) {
            uint256 id = tokenOfOwnerByIndex(holdingAddress, i);

            if (warriorDepositor[id] == _owner) {
                warriors[index++] = id;
            }
        }

        assembly {
            mstore(warriors, index)
        }

        return warriors;
    }

    function arenaActive() public view returns (bool) {
        return arenaOpenedBlock > 0;
    }

    function entryOpen() public view returns (bool) {
        return arenaActive() && block.number < entryClosedBlock();
    }

    function entryClosedBlock() public view returns (uint256) {
        return arenaOpenedBlock + arenaWaitBlocks;
    }

    function totalSurvivingWarriors() public view returns (uint256) {
        return balanceOf(address(this));
    }

    function howHungryAreTheLions() public view returns (uint256) {
        uint256 totalWarriors = totalSurvivingWarriors();

        if (totalWarriors == 0) {
            return 0;
        }

        uint256 hunger = 1;

        // Calculate how many warriors got eaten (0.2% of warriors > 1000)
        if (totalWarriors >= 2000) {
            uint256 excess = totalWarriors - 1000;
            hunger = excess / 500;
        }

        // Never eat the last man standing
        if (hunger >= totalWarriors) {
            hunger = totalWarriors - 1;
        }

        // Generous upper bound to prevent gas overflow
        if (hunger > 50) {
            hunger = 50;
        }

        return hunger;
    }

    function theLionsAreHungry() public view returns (bool) {
        return block.number >= lionsLastFeeding + blocksPerRound;
    }

    // -- OWNER METHODS --

    function openArena() external payable onlyOwner onlySaleComplete {
        if (arenaActive()) {
            revert ArenaIsActive();
        }
        if (balanceNotWithdrawn) {
            revert BalanceNotWithdrawn();
        }

        // Open the arena
        arenaOpenedBlock = block.number;
        lionsLastFeeding = block.number + arenaWaitBlocks;
    }

    // -- USER METHODS --

    // Can be called every `blocksPerRound` blocks to kill off some eager warriors
    function timeToEat() external {
        if (!arenaActive()) {
            revert ArenaNotActive();
        }
        if (!theLionsAreHungry()) {
            revert LionsNotHungry();
        }

        uint256 totalWarriors = totalSurvivingWarriors();
        if (totalWarriors == 1) {
            revert LastManStanding();
        }
        if (totalWarriors == 0) {
            revert GameOver();
        }

        // The blockhash of every `blocksPerRound` block is used to determine who gets eaten
        uint256 entropyBlock;
        if (block.number - (lionsLastFeeding + blocksPerRound) > 255) {
            // If this method isn't called within 255 blocks of the period end, this is a fallback so we can still progress
            entropyBlock = (block.number / blocksPerRound) * blocksPerRound - 1;
        } else {
            // Use blockhash of every 69th block
            entropyBlock = (lionsLastFeeding + blocksPerRound) - 1;
        }
        uint256 entropy = uint256(blockhash(entropyBlock));
        assert(entropy != 0);

        // Update state
        lionsLastFeeding = block.number;
        currentRound++;

        // Kill off a percentage of warriors
        uint256 killCounter = howHungryAreTheLions();
        bytes memory buffer = new bytes(32);
        for (uint256 i = 0; i < killCounter; i++) {
            uint256 tmp;
            unchecked { tmp = entropy + i; }
            // Gas saving trick to avoid abi.encodePacked
            assembly { mstore(add(buffer, 32), tmp) }
            uint256 whoDied = uint256(keccak256(buffer)) % totalWarriors;
            // Go to your happy place, loser
            uint256 faceToEat = tokenOfOwnerByIndex(address(this), whoDied);
            _transfer(address(this), happyFacePlace, faceToEat);
            // Take one down
            totalWarriors--;
        }

        // Record the champion
        if (totalWarriors == 1) {
            champion = tokenOfOwnerByIndex(address(this), 0);
        }
    }

    function joinArena(uint256 _tokenId) external onlyOpenArena {
        _joinArena(_tokenId);
    }

    function multiJoinArena(uint256[] memory _tokenIds) external onlyOpenArena {
        if (_tokenIds.length > 20) {
            revert InvalidJoinCount();
        }

        for (uint256 i; i < _tokenIds.length; i++) {
            _joinArena(_tokenIds[i]);
        }
    }

    function leaveArena(uint256 _tokenId) external {
        if (warriorDepositor[_tokenId] != msg.sender) {
            revert NotYourWarrior();
        }

        // Can't leave arena if lions are hungry (unless it's the champ and the game is over)
        uint256 survivors = totalSurvivingWarriors();
        if (survivors != 1 && theLionsAreHungry()) {
            revert LionsAreHungry();
        }

        // Can't leave before a single round has passed
        uint256 round = currentRound;
        if (currentRound == 0) {
            revert LeavingProhibited();
        }

        // Record the warrior's achievement
        roundsSurvived[_tokenId] = round;

        // Clear state
        delete warriorDepositor[_tokenId];

        // Return warrior and pay bounty
        uint256 battleBounty = address(this).balance / survivors;
        _transfer(address(this), msg.sender, _tokenId);
        payable(msg.sender).transfer(battleBounty);

        // If this was the second last warrior to leave, the last one left is the champ
        if (survivors == 2) {
            champion = tokenOfOwnerByIndex(address(this), 0);
        }
    }

    // -- INTERNAL METHODS --

    function _joinArena(uint256 _tokenId) internal {
        // Send warrior to the arena
        transferFrom(msg.sender, address(this), _tokenId);
        warriorDepositor[_tokenId] = msg.sender;
    }

    /*************************
     MISC
     *************************/

    function onERC721Received(address, address, uint256, bytes memory) external pure returns (bytes4) {
        return this.onERC721Received.selector;
    }

    function _beforeTokenTransfer(address _from, address _to, uint256 _tokenId) internal override(ERC721, ERC721Enumerable) {
        super._beforeTokenTransfer(_from, _to, _tokenId);
    }

    function supportsInterface(bytes4 _interfaceId) public view virtual override(ERC721, ERC721Enumerable) returns (bool) {
        return super.supportsInterface(_interfaceId);
    }
}

File 2 of 16 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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: balance query for the zero address");
        return _balances[owner];
    }

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

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

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

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _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: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

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

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);
    }

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

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

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

File 3 of 16 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 4 of 16 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

File 5 of 16 : MerkleProof.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }
        return computedHash;
    }
}

File 6 of 16 : ChainFaces2Renderer.sol
// SPDX-License-Identifier: GPLv3

pragma solidity 0.8.7;

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

contract ChainFaces2Renderer {

    using Strings for uint256;

    address public constant happyFacePlace = 0x7039D65E346FDEEBbc72514D718C88699c74ba4b;

    // Rendering constants
    string[18] public leftFaceArray = [unicode"ლ", unicode"ᕦ", unicode"(ง", unicode"𐐋", unicode"ᖳ", unicode"Ƹ", unicode"ᛩ", unicode"⦃", unicode"{", unicode"⦗", unicode"〈", unicode"⧼", unicode"|", unicode"〘", unicode"〚", unicode"【", unicode"[", unicode"❪"];
    string[20] public leftEyeArray = [unicode"⚈", unicode"⚙", unicode"⊗", unicode"⋗", unicode" ͡°", unicode"◈", unicode"◬", unicode"≻", unicode"᛫", unicode"⨕", unicode"★", unicode"Ͼ", unicode"ᗒ", unicode"◠", unicode"⊡", unicode"⊙", unicode"▸", unicode"˘", unicode"⦿", unicode"●"];
    string[22] public mouthArray = [unicode"෴", unicode"∪", unicode"ᨏ", unicode"᎔", unicode"᎑", unicode"⋏", unicode"⚇", unicode"_", unicode"۷", unicode"▾", unicode"ᨎ", unicode"ʖ", unicode"ܫ", unicode"໒", unicode"𐑒", unicode"⌴", unicode"‿", unicode"𐠑", unicode"⌒", unicode"◡", unicode"⥿", unicode"⩊"];
    string[20] public rightEyeArray = [unicode"⚈", unicode"⚙", unicode"⊗", unicode"⋖", unicode" ͡°", unicode"◈", unicode"◬", unicode"≺", unicode"᛫", unicode"⨕", unicode"★", unicode"Ͽ", unicode"ᗕ", unicode"◠", unicode"⊡", unicode"⊙", unicode"◂", unicode"˘", unicode"⦿", unicode"●"];
    string[18] public rightFaceArray = [unicode"ლ", unicode"ᕤ", unicode")ง", unicode"𐐙", unicode"ᖰ", unicode"Ʒ", unicode"ᚹ", unicode"⦄", unicode"}", unicode"⦘", unicode"〉", unicode"⧽", unicode"|", unicode"〙", unicode"〛", unicode"】", unicode"]", unicode"❫"];

    uint256[22] rarityArray = [0, 2, 5, 9, 14, 20, 27, 35, 44, 54, 65, 77, 90, 104, 119, 135, 152, 170, 189, 209, 230, 252];

    uint256[5][] ancients;

    constructor() {
        ancients.push([0, 0, 0, 0, 0]);
        ancients.push([1, 1, 1, 1, 1]);
        ancients.push([2, 2, 2, 2, 2]);
        ancients.push([3, 3, 3, 3, 3]);
        ancients.push([4, 4, 4, 4, 4]);
        ancients.push([5, 5, 5, 5, 5]);
        ancients.push([6, 6, 6, 6, 6]);
        ancients.push([7, 7, 7, 7, 7]);
        ancients.push([8, 8, 8, 8, 8]);
        ancients.push([9, 9, 9, 9, 9]);
    }

    function getLeftFace(uint256 id, uint256 seed) public view returns (string memory) {
        if (id < ancients.length) {
            return leftFaceArray[ancients[id][0]];
        }

        uint256 raritySelector = seed % 189;

        uint256 charSelector = 0;

        for (uint i = 0; i < 18; i++) {
            if (raritySelector >= rarityArray[i]) {
                charSelector = i;
            }
        }

        return leftFaceArray[charSelector];
    }

    function getLeftEye(uint256 id, uint256 seed) public view returns (string memory) {
        if (id < ancients.length) {
            return leftEyeArray[ancients[id][1]];
        }

        uint256 raritySelector = seed % 230;

        uint256 charSelector = 0;

        for (uint i = 0; i < 20; i++) {
            if (raritySelector >= rarityArray[i]) {
                charSelector = i;
            }
        }

        return leftEyeArray[charSelector];
    }

    function getMouth(uint256 id, uint256 seed) public view returns (string memory) {
        if (id < ancients.length) {
            return mouthArray[ancients[id][2]];
        }

        uint256 raritySelector = seed % 275;

        uint256 charSelector = 0;

        for (uint i = 0; i < 22; i++) {
            if (raritySelector >= rarityArray[i]) {
                charSelector = i;
            }
        }

        return mouthArray[charSelector];
    }

    function getRightEye(uint256 id, uint256 seed) public view returns (string memory) {
        if (id < ancients.length) {
            return rightEyeArray[ancients[id][3]];
        }

        uint256 raritySelector = uint256(keccak256(abi.encodePacked(seed))) % 230;

        uint256 charSelector = 0;

        for (uint i = 0; i < 20; i++) {
            if (raritySelector >= rarityArray[i]) {
                charSelector = i;
            }
        }

        return rightEyeArray[charSelector];
    }

    function getRightFace(uint256 id, uint256 seed) public view returns (string memory) {
        if (id < ancients.length) {
            return rightFaceArray[ancients[id][4]];
        }

        uint256 raritySelector = uint256(keccak256(abi.encodePacked(seed))) % 189;

        uint256 charSelector = 0;

        for (uint i = 0; i < 18; i++) {
            if (raritySelector >= rarityArray[i]) {
                charSelector = i;
            }
        }

        return rightFaceArray[charSelector];
    }

    function assembleFace(bool revealComplete, uint256 id, uint256 seed) public view returns (string memory face) {
        if (!revealComplete) {
            return '(._.)';
        }

        return string(abi.encodePacked(
                getLeftFace(id, seed),
                getLeftEye(id, seed),
                getMouth(id, seed),
                getRightEye(id, seed),
                getRightFace(id, seed)
            ));
    }

    function calculateGolfScore(uint256 id, uint256 seed) public view returns (uint256) {
        if (id < ancients.length) {
            return 0;
        }

        uint256 leftFaceRarity = seed % 189;
        uint256 lefEyeRarity = seed % 230;
        uint256 mouthRarity = seed % 275;
        uint256 rightEyeRarity = uint256(keccak256(abi.encodePacked(seed))) % 230;
        uint256 rightFaceRarity = uint256(keccak256(abi.encodePacked(seed))) % 189;

        uint256 leftFaceGolf = 0;
        uint256 leftEyeGolf = 0;
        uint256 mouthGolf = 0;
        uint256 rightEyeGolf = 0;
        uint256 rightFaceGolf = 0;
        uint256 i = 0;

        for (i = 0; i < 18; i++) {
            if (leftFaceRarity >= rarityArray[i]) {
                leftFaceGolf = i;
            }
        }
        for (i = 0; i < 20; i++) {
            if (lefEyeRarity >= rarityArray[i]) {
                leftEyeGolf = i;
            }
        }
        for (i = 0; i < 22; i++) {
            if (mouthRarity >= rarityArray[i]) {
                mouthGolf = i;
            }
        }
        for (i = 0; i < 20; i++) {
            if (rightEyeRarity >= rarityArray[i]) {
                rightEyeGolf = i;
            }
        }
        for (i = 0; i < 18; i++) {
            if (rightFaceRarity >= rarityArray[i]) {
                rightFaceGolf = i;
            }
        }

        return leftFaceGolf + leftEyeGolf + mouthGolf + rightEyeGolf + rightFaceGolf;
    }

    function calculateSymmetry(uint256 id, uint256 seed) public view returns (string memory) {

        uint256 symCount = 0;

        if (id < ancients.length) {
            symCount = 2;
        } else {
            uint256 leftFaceRarity = seed % 189;
            uint256 lefEyeRarity = seed % 230;
            uint256 rightEyeRarity = uint256(keccak256(abi.encodePacked(seed))) % 230;
            uint256 rightFaceRarity = uint256(keccak256(abi.encodePacked(seed))) % 189;

            uint256 leftFaceIndex = 0;
            uint256 leftEyeIndex = 0;
            uint256 rightEyeIndex = 0;
            uint256 rightFaceIndex = 0;
            uint256 i = 0;

            for (i = 0; i < 18; i++) {
                if (leftFaceRarity >= rarityArray[i]) {
                    leftFaceIndex = i;
                }
            }
            for (i = 0; i < 20; i++) {
                if (lefEyeRarity >= rarityArray[i]) {
                    leftEyeIndex = i;
                }
            }
            for (i = 0; i < 20; i++) {
                if (rightEyeRarity >= rarityArray[i]) {
                    rightEyeIndex = i;
                }
            }
            for (i = 0; i < 18; i++) {
                if (rightFaceRarity >= rarityArray[i]) {
                    rightFaceIndex = i;
                }
            }

            if (leftFaceIndex == rightFaceIndex) {
                symCount = symCount + 1;
            }
            if (leftEyeIndex == rightEyeIndex) {
                symCount = symCount + 1;
            }
        }

        if (symCount == 2) {
            return "100% Symmetry";
        }
        else if (symCount == 1) {
            return "Partial Symmetry";
        }
        else {
            return "No Symmetry";
        }
    }

    function getTextColor(uint256 id) public view returns (string memory) {
        if (id < ancients.length) {
            return 'RGB(148,256,209)';
        } else {
            return 'RGB(0,0,0)';
        }
    }

    function getBackgroundColor(uint256 id, uint256 seed, address owner) public view returns (string memory){
        if (id < ancients.length) {
            return 'RGB(128,128,128)';
        }

        uint256 golf = calculateGolfScore(id, seed);
        uint256 red;
        uint256 green;
        uint256 blue;

        if (owner == happyFacePlace) {
            red = 255;
            green = 128;
            blue = 128;
        }
        else if (golf >= 56) {
            red = 255;
            green = 255;
            blue = 255 - (golf - 56) * 4;
        }
        else {
            red = 255 - (56 - golf) * 4;
            green = 255 - (56 - golf) * 4;
            blue = 255;
        }

        return string(abi.encodePacked("RGB(", red.toString(), ",", green.toString(), ",", blue.toString(), ")"));
    }

    string constant headerText = 'data:application/json;ascii,{"description": "We are warrior ChainFaces. Here to watch over you forever, unless we get eaten by lions.","image":"data:image/svg+xml;base64,';
    string constant attributesText = '","attributes":[{"trait_type":"Golf Score","value":';
    string constant symmetryText = '},{"trait_type":"Symmetry","value":"';
    string constant leftFaceText = '"},{"trait_type":"Left Face","value":"';
    string constant leftEyeText = '"},{"trait_type":"Left Eye","value":"';
    string constant mouthText = '"},{"trait_type":"Mouth","value":"';
    string constant rightEyeText = '"},{"trait_type":"Right Eye","value":"';
    string constant rightFaceText = '"},{"trait_type":"Right Face","value":"';
    string constant arenaDurationText = '"},{"trait_type":"Arena Score","value":';
    string constant ancientText = '},{"trait_type":"Ancient","value":"';
    string constant footerText = '"}]}';

    function renderMetadata(bool revealComplete, uint256 id, uint256 seed, uint256 arenaDuration, address owner) external view returns (string memory) {
        if (!revealComplete) {
            return preRevealMetadata();
        }

        uint256 golfScore = calculateGolfScore(id, seed);

        string memory svg = b64Encode(bytes(renderSvg(true, id, seed, arenaDuration, owner)));

        string memory attributes = string(abi.encodePacked(attributesText, golfScore.toString()));
        attributes = string(abi.encodePacked(attributes, symmetryText, calculateSymmetry(id, seed)));
        attributes = string(abi.encodePacked(attributes, leftFaceText, getLeftFace(id, seed)));
        attributes = string(abi.encodePacked(attributes, leftEyeText, getLeftEye(id, seed)));
        attributes = string(abi.encodePacked(attributes, mouthText, getMouth(id, seed)));
        attributes = string(abi.encodePacked(attributes, rightEyeText, getRightEye(id, seed)));
        attributes = string(abi.encodePacked(attributes, rightFaceText, getRightFace(id, seed)));
        attributes = string(abi.encodePacked(attributes, arenaDurationText, arenaDuration.toString()));

        if (id < ancients.length) {
            attributes = string(abi.encodePacked(attributes, ancientText, 'Ancient'));
        } else {
            attributes = string(abi.encodePacked(attributes, ancientText, 'Not Ancient'));
        }

        attributes = string(abi.encodePacked(attributes, footerText));

        return string(abi.encodePacked(headerText, svg, attributes));
    }

    string constant svg1 = "<svg xmlns='http://www.w3.org/2000/svg' width='400' height='400' style='background-color:";
    string constant svg2 = "'>";
    string constant svg3 = "<text x='50%' y='50%' dominant-baseline='middle' text-anchor='middle' font-size='75px' fill='";
    string constant svg4 = "'>";
    string constant svg5 = "</text></svg>";

    function renderSvg(bool revealComplete, uint256 id, uint256 seed, uint256 arenaDuration, address owner) public view returns (string memory) {
        if (!revealComplete) {
            return preRevealSvg();
        }

        string memory face = assembleFace(true, id, seed);
        string memory scars;

        if (arenaDuration > 0) {
            scars = generateScars(arenaDuration, seed);
        }

        return string(abi.encodePacked(svg1, getBackgroundColor(id, seed, owner), svg2, scars, svg3, getTextColor(id), svg4, face, svg5));
    }

    string constant scarSymbol = "<symbol id='scar'><g stroke='RGBA(200,40,40,.35)'><text x='40' y='40' dominant-baseline='middle' text-anchor='middle' font-weight='bold' font-size='22px' fill='RGBA(200,40,40,.45)'>++++++</text></g></symbol>";
    string constant scarPlacement1 = "<g transform='translate(";
    string constant scarPlacement2 = ") scale(";
    string constant scarPlacement3 = ") rotate(";
    string constant scarPlacement4 = ")'><use href='#scar'/></g>";

    function generateScars(uint256 arenaDuration, uint256 seed) internal pure returns (string memory) {
        string memory scars;
        string memory scarsTemp;

        uint256 count = arenaDuration / 10;

        if (count > 500) {
            count = 500;
        }

        for (uint256 i = 0; i < count; i++) {
            string memory scar;

            uint256 scarSeed = uint256(keccak256(abi.encodePacked(seed, i)));

            uint256 scale1 = scarSeed % 2;
            uint256 scale2 = scarSeed % 5;
            if (scale1 == 0) {
                scale2 += 5;
            }
            uint256 xShift = scarSeed % 332;
            uint256 yShift = scarSeed % 354;
            int256 rotate = int256(scarSeed % 91) - 45;

            scar = string(abi.encodePacked(scar, scarPlacement1, xShift.toString(), " ", yShift.toString(), scarPlacement2, scale1.toString(), ".", scale2.toString()));

            if (rotate >= 0) {
                scar = string(abi.encodePacked(scar, scarPlacement3, uint256(rotate).toString(), scarPlacement4));
            } else {
                scar = string(abi.encodePacked(scar, scarPlacement3, "-", uint256(0 - rotate).toString(), scarPlacement4));
            }

            scarsTemp = string(abi.encodePacked(scarsTemp, scar));

            if (i % 10 == 0) {
                scars = string(abi.encodePacked(scars, scarsTemp));
                scarsTemp = "";
            }
        }

        return string(abi.encodePacked(scarSymbol, scars, scarsTemp));
    }

    function preRevealMetadata() internal pure returns (string memory) {
        string memory JSON;
        string memory svg = preRevealSvg();
        JSON = string(abi.encodePacked('data:application/json;ascii,{"description": "We are warrior ChainFaces. Here to watch over you forever, unless we get eaten by lions.","image":"data:image/svg+xml;base64,', b64Encode(bytes(svg)), '"}'));
        return JSON;
    }

    function preRevealSvg() internal pure returns (string memory) {
        return "<svg xmlns='http://www.w3.org/2000/svg' width='400' height='400' style='background-color:RGB(255,255,255);'><text x='50%' y='50%' dominant-baseline='middle' text-anchor='middle' font-size='75px'>?????</text></svg>";
    }

    string constant private TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    function b64Encode(bytes memory _data) internal pure returns (string memory result) {
        if (_data.length == 0) return '';
        string memory _table = TABLE;
        uint256 _encodedLen = 4 * ((_data.length + 2) / 3);
        result = new string(_encodedLen + 32);

        assembly {
            mstore(result, _encodedLen)
            let tablePtr := add(_table, 1)
            let dataPtr := _data
            let endPtr := add(dataPtr, mload(_data))
            let resultPtr := add(result, 32)

            for {} lt(dataPtr, endPtr) {}
            {
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)
                mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))))
                resultPtr := add(resultPtr, 1)
                mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))))
                resultPtr := add(resultPtr, 1)
                mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(6, input), 0x3F)))))
                resultPtr := add(resultPtr, 1)
                mstore(resultPtr, shl(248, mload(add(tablePtr, and(input, 0x3F)))))
                resultPtr := add(resultPtr, 1)
            }
            switch mod(mload(_data), 3)
            case 1 {mstore(sub(resultPtr, 2), shl(240, 0x3d3d))}
            case 2 {mstore(sub(resultPtr, 1), shl(248, 0x3d))}
        }
        return result;
    }
}

File 7 of 16 : ChainFaces2Errors.sol
pragma solidity 0.8.7;

// Sale
error SaleNotOpen();
error NotPreSaleStage();
error NotMainSaleStage();
error SaleNotComplete();
error MainSaleNotComplete();
error AlreadyClaimed();
error InvalidClaimValue();
error InvalidClaimAmount();
error InvalidProof();
error InvalidMintValue();

// NFT
error NonExistentToken();

// Reveal
error InvalidReveal();
error BalanceNotWithdrawn();
error BalanceAlreadyWithdrawn();

// Arena
error LeavingProhibited();
error ArenaIsActive();
error ArenaNotActive();
error ArenaEntryClosed();
error LionsNotHungry();
error LionsAreHungry();
error LastManStanding();
error GameOver();
error InvalidJoinCount();
error NotYourWarrior();

File 8 of 16 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

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

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

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

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

File 9 of 16 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 10 of 16 : 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 11 of 16 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

File 12 of 16 : 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 13 of 16 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

File 14 of 16 : 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 15 of 16 : 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 16 of 16 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

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

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"uint256","name":"_tokenLimit","type":"uint256"},{"internalType":"uint256","name":"_secretCommit","type":"uint256"},{"internalType":"address","name":"_renderer","type":"address"},{"internalType":"bytes32","name":"_merkleRoot","type":"bytes32"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AlreadyClaimed","type":"error"},{"inputs":[],"name":"ArenaEntryClosed","type":"error"},{"inputs":[],"name":"ArenaIsActive","type":"error"},{"inputs":[],"name":"ArenaNotActive","type":"error"},{"inputs":[],"name":"BalanceNotWithdrawn","type":"error"},{"inputs":[],"name":"GameOver","type":"error"},{"inputs":[],"name":"InvalidClaimAmount","type":"error"},{"inputs":[],"name":"InvalidClaimValue","type":"error"},{"inputs":[],"name":"InvalidJoinCount","type":"error"},{"inputs":[],"name":"InvalidMintValue","type":"error"},{"inputs":[],"name":"InvalidProof","type":"error"},{"inputs":[],"name":"InvalidReveal","type":"error"},{"inputs":[],"name":"LastManStanding","type":"error"},{"inputs":[],"name":"LeavingProhibited","type":"error"},{"inputs":[],"name":"LionsAreHungry","type":"error"},{"inputs":[],"name":"LionsNotHungry","type":"error"},{"inputs":[],"name":"MainSaleNotComplete","type":"error"},{"inputs":[],"name":"NonExistentToken","type":"error"},{"inputs":[],"name":"NotMainSaleStage","type":"error"},{"inputs":[],"name":"NotPreSaleStage","type":"error"},{"inputs":[],"name":"NotYourWarrior","type":"error"},{"inputs":[],"name":"SaleNotComplete","type":"error"},{"inputs":[],"name":"SaleNotOpen","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"arenaActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"arenaInfo","outputs":[{"components":[{"internalType":"uint256","name":"fallen","type":"uint256"},{"internalType":"uint256","name":"alive","type":"uint256"},{"internalType":"uint256","name":"currentRound","type":"uint256"},{"internalType":"uint256","name":"bounty","type":"uint256"},{"internalType":"uint256","name":"hunger","type":"uint256"},{"internalType":"uint256","name":"nextFeed","type":"uint256"},{"internalType":"uint256","name":"champion","type":"uint256"},{"internalType":"uint256","name":"entryClosedBlock","type":"uint256"},{"internalType":"bool","name":"hungry","type":"bool"},{"internalType":"bool","name":"open","type":"bool"},{"internalType":"bool","name":"active","type":"bool"},{"internalType":"bool","name":"gameOver","type":"bool"}],"internalType":"struct ChainFaces2.ArenaInfo","name":"info","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"arenaWaitBlocks","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"}],"name":"assembleFace","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"blocksPerRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_index","type":"uint256"},{"internalType":"uint256","name":"_ogAmount","type":"uint256"},{"internalType":"uint256","name":"_wlAmount","type":"uint256"},{"internalType":"bytes32[]","name":"_merkleProof","type":"bytes32[]"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"claim","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"createFace","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"currentRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"entryClosedBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"entryOpen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"howHungryAreTheLions","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"isClaimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"joinArena","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"leaveArena","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"mainSaleComplete","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"}],"name":"multiJoinArena","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_alive","type":"bool"}],"name":"myWarriors","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC721Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"openArena","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"},{"internalType":"bool","name":"_alive","type":"bool"}],"name":"ownerWarriors","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"}],"name":"renderSvg","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renderer","outputs":[{"internalType":"contract ChainFaces2Renderer","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"roundsSurvived","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"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":[],"name":"saleEnds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"saleLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"salePrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stage","outputs":[{"internalType":"enum ChainFaces2.Stage","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startMainSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_secretReveal","type":"uint256"}],"name":"theGreatReveal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"theLionsAreHungry","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"timeToEat","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSurvivingWarriors","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

0000000000000000000000000000000000000000000000000000000000006959c7b6f06e1d9d671518e2a41b937f4c13f46dc5e4ce9ceee0cbd4267c94d98ba800000000000000000000000018c4a85e52c23675f0a57cfa9a55e4d407654017c91445c29574411c6ba72be81edb6acd5d12a3418e2082b993f0e9c00a5bf3cc

-----Decoded View---------------
Arg [0] : _tokenLimit (uint256): 26969
Arg [1] : _secretCommit (uint256): 90333482421695848515465926835468518679924540404336990496885294470248321878952
Arg [2] : _renderer (address): 0x18c4a85E52c23675F0a57Cfa9a55e4d407654017
Arg [3] : _merkleRoot (bytes32): 0xc91445c29574411c6ba72be81edb6acd5d12a3418e2082b993f0e9c00a5bf3cc

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000006959
Arg [1] : c7b6f06e1d9d671518e2a41b937f4c13f46dc5e4ce9ceee0cbd4267c94d98ba8
Arg [2] : 00000000000000000000000018c4a85e52c23675f0a57cfa9a55e4d407654017
Arg [3] : c91445c29574411c6ba72be81edb6acd5d12a3418e2082b993f0e9c00a5bf3cc


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