Address Contract Verified
Address
0xDD01A768ac00814325C0Fa6d3314f0Ef3FC19Ac0
Balance
0 ETH
Nonce
1
Code Size
11122 bytes
Creator
0x705EdD23...6273 at tx 0x9d687c8c...10c4a9
Indexed Transactions
0
Contract Bytecode
11122 bytes
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Verified Source Code Full Match
Compiler: v0.8.4+commit.c7e474f2
EVM: istanbul
Optimization: No
ERC721B.sol 364 lines
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;
import '@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol';
error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error ApproveToCaller();
error ApprovalToCurrentOwner();
error BalanceQueryForZeroAddress();
error MintedQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerIndexOutOfBounds();
error OwnerQueryForNonexistentToken();
error TokenIndexOutOfBounds();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error UnableDetermineTokenOwner();
error UnableGetTokenOwnerByIndex();
error URIQueryForNonexistentToken();
/**
* Updated, minimalist and gas efficient version of OpenZeppelins ERC721 contract.
* Includes the Metadata and Enumerable extension.
*
* Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).
* Does not support burning tokens
*
* @author beskay0x
* Credits: chiru-labs, solmate, transmissions11, nftchance, squeebo_nft and others
*/
abstract contract ERC721B {
/*///////////////////////////////////////////////////////////////
EVENTS
//////////////////////////////////////////////////////////////*/
event Transfer(address indexed from, address indexed to, uint256 indexed id);
event Approval(address indexed owner, address indexed spender, uint256 indexed id);
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/*///////////////////////////////////////////////////////////////
METADATA STORAGE/LOGIC
//////////////////////////////////////////////////////////////*/
string public name;
string public symbol;
function tokenURI(uint256 tokenId) public view virtual returns (string memory);
/*///////////////////////////////////////////////////////////////
ERC721 STORAGE
//////////////////////////////////////////////////////////////*/
// Array which maps token ID to address (index is tokenID)
address[] internal _owners;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/*///////////////////////////////////////////////////////////////
CONSTRUCTOR
//////////////////////////////////////////////////////////////*/
constructor(string memory _name, string memory _symbol) {
name = _name;
symbol = _symbol;
}
/*///////////////////////////////////////////////////////////////
ERC165 LOGIC
//////////////////////////////////////////////////////////////*/
function supportsInterface(bytes4 interfaceId) public pure virtual returns (bool) {
return
interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
interfaceId == 0x780e9d63 || // ERC165 Interface ID for ERC721Enumerable
interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
}
/*///////////////////////////////////////////////////////////////
ERC721ENUMERABLE LOGIC
//////////////////////////////////////////////////////////////*/
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view returns (uint256) {
return _owners.length;
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
* Dont call this function on chain from another smart contract, since it can become quite expensive
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual returns (uint256 tokenId) {
if (index >= balanceOf(owner)) revert OwnerIndexOutOfBounds();
uint256 count;
uint256 qty = _owners.length;
// Cannot realistically overflow, since we are using uint256
unchecked {
for (tokenId; tokenId < qty; tokenId++) {
if (owner == ownerOf(tokenId)) {
if (count == index) return tokenId;
else count++;
}
}
}
revert UnableGetTokenOwnerByIndex();
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual returns (uint256) {
if (index >= totalSupply()) revert TokenIndexOutOfBounds();
return index;
}
/*///////////////////////////////////////////////////////////////
ERC721 LOGIC
//////////////////////////////////////////////////////////////*/
/**
* @dev Iterates through _owners array, returns balance of address
* It is not recommended to call this function from another smart contract
* as it can become quite expensive -- call this function off chain instead.
*/
function balanceOf(address owner) public view virtual returns (uint256) {
if (owner == address(0)) revert BalanceQueryForZeroAddress();
uint256 count;
uint256 qty = _owners.length;
// Cannot realistically overflow, since we are using uint256
unchecked {
for (uint256 i = 0; i < qty; i++) {
if (owner == ownerOf(i)) {
count++;
}
}
}
return count;
}
/**
* @dev See {IERC721-ownerOf}.
* Gas spent here starts off proportional to the maximum mint batch size.
* It gradually moves to O(1) as tokens get transferred around in the collection over time.
*/
function ownerOf(uint256 tokenId) public view virtual returns (address) {
if (!_exists(tokenId)) revert OwnerQueryForNonexistentToken();
// Cannot realistically overflow, since we are using uint256
unchecked {
for (uint256 i = tokenId; ; i++) {
if (_owners[i] != address(0)) {
return _owners[i];
}
}
}
revert UnableDetermineTokenOwner();
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual {
address owner = ownerOf(tokenId);
if (to == owner) revert ApprovalToCurrentOwner();
if (msg.sender != owner && !isApprovedForAll(owner, msg.sender)) revert ApprovalCallerNotOwnerNorApproved();
_tokenApprovals[tokenId] = to;
emit Approval(owner, to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual returns (address) {
if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual {
if (operator == msg.sender) revert ApproveToCaller();
_operatorApprovals[msg.sender][operator] = approved;
emit ApprovalForAll(msg.sender, operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual {
if (!_exists(tokenId)) revert OwnerQueryForNonexistentToken();
if (ownerOf(tokenId) != from) revert TransferFromIncorrectOwner();
if (to == address(0)) revert TransferToZeroAddress();
bool isApprovedOrOwner = (msg.sender == from ||
msg.sender == getApproved(tokenId) ||
isApprovedForAll(from, msg.sender));
if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
// delete token approvals from previous owner
delete _tokenApprovals[tokenId];
_owners[tokenId] = to;
// if token ID below transferred one isnt set, set it to previous owner
// if tokenid is zero, skip this to prevent underflow
if (tokenId > 0) {
if (_owners[tokenId - 1] == address(0)) {
_owners[tokenId - 1] = from;
}
}
emit Transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 id
) public virtual {
transferFrom(from, to, id);
if (!_checkOnERC721Received(from, to, id, '')) revert TransferToNonERC721ReceiverImplementer();
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 id,
bytes memory data
) public virtual {
transferFrom(from, to, id);
if (!_checkOnERC721Received(from, to, id, data)) revert TransferToNonERC721ReceiverImplementer();
}
/**
* @dev Returns whether `tokenId` exists.
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return tokenId < _owners.length;
}
/**
* @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.code.length > 0) {
try IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver(to).onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert TransferToNonERC721ReceiverImplementer();
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/*///////////////////////////////////////////////////////////////
INTERNAL MINT LOGIC
//////////////////////////////////////////////////////////////*/
/**
* @dev check if contract confirms token transfer, if not - reverts
* unlike the standard ERC721 implementation this is only called once per mint,
* no matter how many tokens get minted, since it is useless to check this
* requirement several times -- if the contract confirms one token,
* it will confirm all additional ones too.
* This saves us around 5k gas per additional mint
*/
function _safeMint(address to, uint256 qty) internal virtual {
_mint(to, qty);
if (!_checkOnERC721Received(address(0), to, _owners.length - 1, ''))
revert TransferToNonERC721ReceiverImplementer();
}
function _safeMint(
address to,
uint256 qty,
bytes memory data
) internal virtual {
_mint(to, qty);
if (!_checkOnERC721Received(address(0), to, _owners.length - 1, data))
revert TransferToNonERC721ReceiverImplementer();
}
function _mint(address to, uint256 qty) internal virtual {
if (to == address(0)) revert MintToZeroAddress();
if (qty == 0) revert MintZeroQuantity();
uint256 _currentIndex = _owners.length;
// Cannot realistically overflow, since we are using uint256
unchecked {
for (uint256 i = 0; i < qty - 1; i++) {
_owners.push();
emit Transfer(address(0), to, _currentIndex + i);
}
}
// set last index to receiver
_owners.push(to);
emit Transfer(address(0), to, _currentIndex + (qty - 1));
}
}
MuscleBrainMonsters.sol 38 lines
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@beskay/erc721b/contracts/ERC721B.sol";
contract MuscleBrainMonsters is Ownable, ERC721B {
using Strings for uint256;
string public _baseUri;
address public minter;
uint256 public purchaseLimit;
constructor() ERC721B("Muscle Brain Monsters", "MBM") {
}
function setMinter(address _minter, string memory __baseUri, uint256 _purchaseLimit) public onlyOwner {
minter = _minter;
_baseUri = __baseUri;
purchaseLimit = _purchaseLimit;
}
function updateBaseTokenURI(string memory __baseUri) public onlyOwner {
_baseUri = __baseUri;
}
function mint(address to, uint256 quantity) public {
require(msg.sender == minter && quantity <= purchaseLimit, "params error");
_safeMint(to, quantity);
}
function tokenURI(uint256 tokenId) public view override returns (string memory) {
return bytes(_baseUri).length > 0 ? string(abi.encodePacked(_baseUri, tokenId.toString())) : "";
}
}
Context.sol 24 lines
// 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;
}
}
Strings.sol 67 lines
// 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);
}
}
Ownable.sol 76 lines
// 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);
}
}
IERC721Receiver.sol 27 lines
// 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);
}
Read Contract
_baseUri 0x3e63eb2a → string
balanceOf 0x70a08231 → uint256
getApproved 0x081812fc → address
isApprovedForAll 0xe985e9c5 → bool
minter 0x07546172 → address
name 0x06fdde03 → string
owner 0x8da5cb5b → address
ownerOf 0x6352211e → address
purchaseLimit 0x18886657 → uint256
supportsInterface 0x01ffc9a7 → bool
symbol 0x95d89b41 → string
tokenByIndex 0x4f6ccce7 → uint256
tokenOfOwnerByIndex 0x2f745c59 → uint256
tokenURI 0xc87b56dd → string
totalSupply 0x18160ddd → uint256
Write Contract 10 functions
These functions modify contract state and require a wallet transaction to execute.
approve 0x095ea7b3
address to
uint256 tokenId
mint 0x40c10f19
address to
uint256 quantity
renounceOwnership 0x715018a6
No parameters
safeTransferFrom 0x42842e0e
address from
address to
uint256 id
safeTransferFrom 0xb88d4fde
address from
address to
uint256 id
bytes data
setApprovalForAll 0xa22cb465
address operator
bool approved
setMinter 0x7afbcf1e
address _minter
string __baseUri
uint256 _purchaseLimit
transferFrom 0x23b872dd
address from
address to
uint256 tokenId
transferOwnership 0xf2fde38b
address newOwner
updateBaseTokenURI 0x655391c9
string __baseUri
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