文件 1 的 12:Address.sol
pragma solidity ^0.8.0;
library Address {
function isContract(address account) internal view returns (bool) {
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
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");
}
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
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");
}
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);
}
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
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);
}
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
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);
}
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
if (returndata.length > 0) {
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
文件 2 的 12:Context.sol
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
文件 3 的 12:ERC165.sol
pragma solidity ^0.8.0;
import "./IERC165.sol";
abstract contract ERC165 is IERC165 {
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
文件 4 的 12: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";
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;
string private _name;
string private _symbol;
mapping(uint256 => address) private _owners;
mapping(address => uint256) private _balances;
mapping(uint256 => address) private _tokenApprovals;
mapping(address => mapping(address => bool)) private _operatorApprovals;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _balances[owner];
}
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;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
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())) : "";
}
function _baseURI() internal view virtual returns (string memory) {
return "";
}
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);
}
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
function setApprovalForAll(address operator, bool approved) public virtual override {
_setApprovalForAll(_msgSender(), operator, approved);
}
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
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);
}
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");
}
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}
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));
}
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
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"
);
}
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);
}
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
_approve(address(0), tokenId);
_balances[owner] -= 1;
delete _owners[tokenId];
emit Transfer(owner, address(0), tokenId);
}
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);
_approve(address(0), tokenId);
_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
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);
}
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;
}
}
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
文件 5 的 12:FrankenPunks.sol
pragma solidity ^0.8.9;
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import { Address } from "@openzeppelin/contracts/utils/Address.sol";
import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";
import { MerkleProof } from "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
contract FrankenPunks is ERC721, Ownable {
using Strings for uint256;
event SetPresaleMerkleRoot(bytes32 root);
event SetProvenanceHash(string provenanceHash);
event SetAuctionStartAndEnd(uint256 auctionStart, uint256 auctionEnd);
event SetPresaleIsActive(bool presaleIsActive);
event SetSaleIsActive(bool saleIsActive);
event SetIsRevealed(bool isRevealed);
event Finalized();
event SetRoyaltyInfo(address royaltyRecipient, uint256 royaltyAmountNumerator);
event SetStartingIndexBlockNumber(uint256 blockNumber, bool usedForce);
event SetStartingIndex(uint256 startingIndex, uint256 blockNumber);
event SetBaseURI(string baseURI);
event SetPlaceholderURI(string placeholderURI);
event SetContractURI(string contractURI);
event Withdrew(uint256 balance);
uint256 public constant MAX_SUPPLY = 10000;
uint256 public constant MAX_MINT_PER_TX = 5;
uint256 public constant RESERVED_SUPPLY = 300;
uint256 public constant PRESALE_PRICE = 0.088 ether;
uint256 public constant AUCTION_PRICE_START = 0.5 ether;
uint256 public constant AUCTION_PRICE_END = 0.088 ether;
string public constant TOKEN_URI_EXTENSION = ".json";
uint256 public constant ROYALTY_AMOUNT_DENOMINATOR = 1e18;
bytes4 private constant INTERFACE_ID_ERC2981 = 0x2a55205a;
bytes32 public _presaleMerkleRoot;
string public _provenanceHash;
uint256 public _auctionStart;
uint256 public _auctionEnd;
bool public _presaleIsActive = false;
bool public _saleIsActive = false;
bool public _isRevealed = false;
bool public _isFinalized = false;
address public _royaltyRecipient;
uint256 public _royaltyAmountNumerator;
mapping(address => uint256) public _numPresaleMints;
mapping(address => bool) public _usedVoucher;
uint256 public _startingIndexBlockNumber;
uint256 public _startingIndex;
bool public _startingIndexWasSet;
string internal _baseTokenURI;
string internal _placeholderURI;
string internal _contractURI;
uint256 internal _totalSupply;
modifier notFinalized() {
require(
!_isFinalized,
"Metadata is finalized"
);
_;
}
constructor(
string memory placeholderURI
) ERC721("FrankenPunks", "FP") {
_placeholderURI = placeholderURI;
}
function setPresaleMerkleRoot(bytes32 root) external onlyOwner {
_presaleMerkleRoot = root;
emit SetPresaleMerkleRoot(root);
}
function setProvenanceHash(string calldata provenanceHash) external onlyOwner notFinalized {
_provenanceHash = provenanceHash;
emit SetProvenanceHash(provenanceHash);
}
function setAuctionStartAndEnd(uint256 auctionStart, uint256 auctionEnd) external onlyOwner {
require(
auctionStart <= auctionEnd,
"Start must precede end"
);
_auctionStart = auctionStart;
_auctionEnd = auctionEnd;
emit SetAuctionStartAndEnd(auctionStart, auctionEnd);
}
function setPresaleIsActive(bool presaleIsActive) external onlyOwner {
_presaleIsActive = presaleIsActive;
emit SetPresaleIsActive(presaleIsActive);
}
function setSaleIsActive(bool saleIsActive) external onlyOwner {
require(
!saleIsActive || (_auctionStart != 0 && _auctionEnd != 0),
"Auction params must be set"
);
_saleIsActive = saleIsActive;
emit SetSaleIsActive(saleIsActive);
}
function setIsRevealed(bool isRevealed) external onlyOwner notFinalized {
_isRevealed = isRevealed;
emit SetIsRevealed(isRevealed);
}
function finalize() external onlyOwner notFinalized {
require(
_isRevealed,
"Must be revealed to finalize"
);
_isFinalized = true;
emit Finalized();
}
function setRoyaltyInfo(address royaltyRecipient, uint256 royaltyAmountNumerator) external onlyOwner {
_royaltyRecipient = royaltyRecipient;
_royaltyAmountNumerator = royaltyAmountNumerator;
emit SetRoyaltyInfo(royaltyRecipient, royaltyAmountNumerator);
}
function setBaseURI(string calldata baseURI) external onlyOwner notFinalized {
_baseTokenURI = baseURI;
emit SetBaseURI(baseURI);
}
function setPlaceholderURI(string calldata placeholderURI) external onlyOwner {
_placeholderURI = placeholderURI;
emit SetPlaceholderURI(placeholderURI);
}
function setContractURI(string calldata newContractURI) external onlyOwner {
_contractURI = newContractURI;
emit SetContractURI(newContractURI);
}
function withdraw() external onlyOwner {
uint256 balance = address(this).balance;
payable(msg.sender).transfer(balance);
emit Withdrew(balance);
}
function mintReservedTokens(address recipient, uint256 numToMint) external onlyOwner {
uint256 startingSupply = _totalSupply;
require(
startingSupply + numToMint <= RESERVED_SUPPLY,
"Mint would exceed reserved supply"
);
_totalSupply = startingSupply + numToMint;
for (uint256 i = 0; i < numToMint; i++) {
_mint(recipient, startingSupply + i);
}
}
function fallbackSetStartingIndexBlockNumber() external onlyOwner {
require(
_startingIndexBlockNumber == 0,
"Block number was set"
);
_setStartingIndexBlockNumber(true);
}
function mintPresale(
uint256 numToMint,
uint256 maxMints,
uint256 voucherAmount,
bytes32[] calldata merkleProof
) external payable {
require(
_presaleIsActive,
"Presale not active"
);
bytes32 leaf = keccak256(abi.encodePacked(msg.sender, maxMints, voucherAmount));
require(
MerkleProof.verify(merkleProof, _presaleMerkleRoot, leaf),
"Invalid Merkle proof"
);
uint256 newNumPresaleMints = _numPresaleMints[msg.sender] + numToMint;
require(
newNumPresaleMints <= maxMints,
"Presale mints exceeded"
);
uint256 remainingVoucherAmount = 0;
if (voucherAmount != 0 && !_usedVoucher[msg.sender]) {
remainingVoucherAmount = voucherAmount;
_usedVoucher[msg.sender] = true;
}
_numPresaleMints[msg.sender] = newNumPresaleMints;
_mintInner(numToMint, true, remainingVoucherAmount);
}
function mint(uint256 numToMint) external payable {
require(
_saleIsActive,
"Sale not active"
);
require(
numToMint <= MAX_MINT_PER_TX,
"numToMint too large"
);
_mintInner(numToMint, false, 0);
}
function setStartingIndex() external {
require(
!_startingIndexWasSet,
"Starting index was set"
);
uint256 targetBlock = _startingIndexBlockNumber;
require(
targetBlock != 0,
"Block number not set"
);
if (block.number - targetBlock > 256) {
targetBlock = block.number - 1;
}
uint256 startingIndex = uint256(blockhash(targetBlock)) % MAX_SUPPLY;
_startingIndex = startingIndex;
_startingIndexWasSet = true;
emit SetStartingIndex(startingIndex, targetBlock);
}
function tokensOfOwner(address owner, uint256 startId, uint256 endId) external view returns(uint256[] memory) {
uint256 tokenCount = balanceOf(owner);
uint256[] memory ownerTokens = new uint256[](tokenCount);
uint256 ownerIndex = 0;
for (uint256 tokenId = startId; tokenId < endId; tokenId++) {
if (ownerIndex == tokenCount) break;
if (ownerOf(tokenId) == owner) {
ownerTokens[ownerIndex] = tokenId;
ownerIndex++;
}
}
return ownerTokens;
}
function walletOfOwner(address owner) external view returns(uint256[] memory) {
return this.tokensOfOwner(owner, 0, _totalSupply);
}
function royaltyInfo(uint256 , uint256 salePrice) external view returns (address, uint256) {
return (_royaltyRecipient, salePrice * _royaltyAmountNumerator / ROYALTY_AMOUNT_DENOMINATOR);
}
function contractURI() external view returns (string memory) {
return _contractURI;
}
function tokenURI(uint256 tokenId) public view override returns (string memory) {
require(
_exists(tokenId),
"ERC721Metadata: URI query for nonexistent token"
);
if (!_isRevealed) {
return _placeholderURI;
}
string memory baseURI = _baseTokenURI;
return bytes(baseURI).length > 0
? string(abi.encodePacked(baseURI, tokenId.toString(), TOKEN_URI_EXTENSION))
: "";
}
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return (
interfaceId == INTERFACE_ID_ERC2981 ||
super.supportsInterface(interfaceId)
);
}
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
function getCurrentAuctionPrice() public view returns (uint256) {
uint256 auctionStart = _auctionStart;
uint256 auctionEnd = _auctionEnd;
uint256 timestamp = block.timestamp;
if (auctionStart == 0 || auctionEnd == 0 || auctionStart >= timestamp) {
return AUCTION_PRICE_START;
}
if (auctionEnd <= timestamp) {
return AUCTION_PRICE_END;
}
uint256 progress = (timestamp - auctionStart) * 1e18 / (auctionEnd - auctionStart);
return AUCTION_PRICE_START - ((AUCTION_PRICE_START - AUCTION_PRICE_END) * progress / 1e18);
}
function getCost(uint256 numToMint, bool isPresale) public view returns (uint256) {
if (isPresale) {
return numToMint * PRESALE_PRICE;
}
return numToMint * getCurrentAuctionPrice();
}
function _mintInner(uint256 numToMint, bool isPresale, uint256 voucherAmount) internal {
uint256 startingSupply = _totalSupply;
require(
startingSupply + numToMint <= MAX_SUPPLY,
"Mint would exceed max supply"
);
require(
getCost(numToMint, isPresale) <= msg.value + voucherAmount,
"Insufficient payment"
);
require(
!Address.isContract(msg.sender),
"Cannot mint from a contract"
);
_totalSupply = startingSupply + numToMint;
for (uint256 i = 0; i < numToMint; i++) {
_mint(msg.sender, startingSupply + i);
}
if (startingSupply + numToMint == MAX_SUPPLY) {
if (bytes(_provenanceHash).length != 0) {
_setStartingIndexBlockNumber(false);
}
}
}
function _setStartingIndexBlockNumber(bool usedForce) internal {
uint256 blockNumber = block.number + 1;
_startingIndexBlockNumber = blockNumber;
emit SetStartingIndexBlockNumber(blockNumber, usedForce);
}
}
文件 6 的 12:IERC165.sol
pragma solidity ^0.8.0;
interface IERC165 {
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
文件 7 的 12:IERC721.sol
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
interface IERC721 is IERC165 {
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
function balanceOf(address owner) external view returns (uint256 balance);
function ownerOf(uint256 tokenId) external view returns (address owner);
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
function approve(address to, uint256 tokenId) external;
function getApproved(uint256 tokenId) external view returns (address operator);
function setApprovalForAll(address operator, bool _approved) external;
function isApprovedForAll(address owner, address operator) external view returns (bool);
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
文件 8 的 12:IERC721Metadata.sol
pragma solidity ^0.8.0;
import "../IERC721.sol";
interface IERC721Metadata is IERC721 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function tokenURI(uint256 tokenId) external view returns (string memory);
}
文件 9 的 12:IERC721Receiver.sol
pragma solidity ^0.8.0;
interface IERC721Receiver {
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
文件 10 的 12:MerkleProof.sol
pragma solidity ^0.8.0;
library MerkleProof {
function verify(
bytes32[] memory proof,
bytes32 root,
bytes32 leaf
) internal pure returns (bool) {
return processProof(proof, leaf) == root;
}
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) {
computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
} else {
computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
}
}
return computedHash;
}
}
文件 11 的 12:Ownable.sol
pragma solidity ^0.8.0;
import "../utils/Context.sol";
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_transferOwnership(_msgSender());
}
function owner() public view virtual returns (address) {
return _owner;
}
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
文件 12 的 12:Strings.sol
pragma solidity ^0.8.0;
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
function toString(uint256 value) internal pure returns (string memory) {
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);
}
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);
}
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);
}
}
{
"compilationTarget": {
"contracts/FrankenPunks.sol": "FrankenPunks"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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