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Latest 25 from a total of 693 transactions
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Withdraw | 20391739 | 52 days ago | IN | 0.00089 ETH | 0.00171528 | ||||
Withdraw | 20253523 | 71 days ago | IN | 0.00089 ETH | 0.00053537 | ||||
Withdraw | 20187733 | 80 days ago | IN | 0.00089 ETH | 0.00114403 | ||||
Withdraw | 20153749 | 85 days ago | IN | 0.00089 ETH | 0.00212909 | ||||
Withdraw | 19844702 | 128 days ago | IN | 0.00089 ETH | 0.00089566 | ||||
Withdraw | 19842711 | 128 days ago | IN | 0.00089 ETH | 0.00195883 | ||||
Claim Reward | 19826973 | 131 days ago | IN | 0.00089 ETH | 0.00118036 | ||||
Withdraw | 19731692 | 144 days ago | IN | 0.00089 ETH | 0.00422584 | ||||
Withdraw | 19699981 | 148 days ago | IN | 0.00089 ETH | 0.00072633 | ||||
Withdraw | 19644551 | 156 days ago | IN | 0.00089 ETH | 0.00236936 | ||||
Transfer | 19421203 | 188 days ago | IN | 0.0111 ETH | 0.00140978 | ||||
Claim Reward | 19395330 | 191 days ago | IN | 0.00089 ETH | 0.0108884 | ||||
Withdraw | 19231536 | 214 days ago | IN | 0.00089 ETH | 0.00381042 | ||||
Claim Reward | 19231510 | 214 days ago | IN | 0.00089 ETH | 0.0039429 | ||||
Claim Reward | 19151059 | 225 days ago | IN | 0.00089 ETH | 0.00314053 | ||||
Withdraw | 19103389 | 232 days ago | IN | 0.00089 ETH | 0.00339069 | ||||
Claim Reward | 19075081 | 236 days ago | IN | 0.00089 ETH | 0.00195057 | ||||
Claim Reward | 19057100 | 239 days ago | IN | 0.00089 ETH | 0.0030429 | ||||
Claim Reward | 18987682 | 248 days ago | IN | 0.00089 ETH | 0.0038754 | ||||
Claim Reward | 18985205 | 249 days ago | IN | 0.00089 ETH | 0.00699669 | ||||
Claim Reward | 18937220 | 255 days ago | IN | 0.00089 ETH | 0.00345612 | ||||
Withdraw | 18863630 | 266 days ago | IN | 0.00089 ETH | 0.00800157 | ||||
Withdraw | 18861946 | 266 days ago | IN | 0.00089 ETH | 0.00668286 | ||||
Withdraw | 18859218 | 266 days ago | IN | 0.00089 ETH | 0.00536995 | ||||
Claim Reward | 18858799 | 266 days ago | IN | 0.00089 ETH | 0.0040831 |
Latest 25 internal transactions (View All)
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Parent Transaction Hash | Block | From | To | |||
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20391739 | 52 days ago | 0.00089 ETH | ||||
20253523 | 71 days ago | 0.00089 ETH | ||||
20187733 | 80 days ago | 0.00089 ETH | ||||
20153749 | 85 days ago | 0.00089 ETH | ||||
19844702 | 128 days ago | 0.00089 ETH | ||||
19842711 | 128 days ago | 0.00089 ETH | ||||
19826973 | 131 days ago | 0.00089 ETH | ||||
19731692 | 144 days ago | 0.00089 ETH | ||||
19699981 | 148 days ago | 0.00089 ETH | ||||
19644551 | 156 days ago | 0.00089 ETH | ||||
19395330 | 191 days ago | 0.00089 ETH | ||||
19231536 | 214 days ago | 0.00089 ETH | ||||
19231510 | 214 days ago | 0.00089 ETH | ||||
19151059 | 225 days ago | 0.00089 ETH | ||||
19103389 | 232 days ago | 0.00089 ETH | ||||
19075081 | 236 days ago | 0.00089 ETH | ||||
19057100 | 239 days ago | 0.00089 ETH | ||||
18987682 | 248 days ago | 0.00089 ETH | ||||
18985205 | 249 days ago | 0.00089 ETH | ||||
18937220 | 255 days ago | 0.00089 ETH | ||||
18863630 | 266 days ago | 0.00089 ETH | ||||
18861946 | 266 days ago | 0.00089 ETH | ||||
18859218 | 266 days ago | 0.00089 ETH | ||||
18858799 | 266 days ago | 0.00089 ETH | ||||
18692495 | 290 days ago | 0.00089 ETH |
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Contract Name:
LuckyRooNftStaking
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 100 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @author Brewlabs * This contract has been developed by brewlabs.info */ import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; contract LuckyRooNftStaking is Ownable, IERC721Receiver, ReentrancyGuard { using SafeERC20 for IERC20; bytes4 private constant _ERC721_RECEIVED = 0x150b7a02; uint256 private constant BLOCKS_PER_DAY = 6426; uint256 private PRECISION_FACTOR; // Whether it is initialized bool public isInitialized; uint256 public duration = 365; // 365 days // The block number when staking starts. uint256 public startBlock; // The block number when staking ends. uint256 public bonusEndBlock; // tokens created per block. uint256 public rewardPerBlock; // The block number of the last pool update uint256 public lastRewardBlock; address public treasury = 0xf91AfC2c104d040c5FCcDA625d038b09AE407019; uint256 public performanceFee = 0.00089 ether; // The staked token IERC721 public stakingNft; // The earned token IERC20 public earnedToken; // Accrued token per share uint256 public accTokenPerShare; uint256 public oneTimeLimit = 40; uint256 public totalStaked; uint256 private totalEarned; uint256 private paidRewards; uint256 private shouldTotalPaid; struct UserInfo { uint256 amount; // number of staked NFTs uint256[] tokenIds; // staked tokenIds uint256 rewardDebt; // Reward debt } // Info of each user that stakes tokenIds mapping(address => UserInfo) public userInfo; event Deposit(address indexed user, uint256[] tokenIds); event Withdraw(address indexed user, uint256[] tokenIds); event Claim(address indexed user, uint256 amount); event EmergencyWithdraw(address indexed user, uint256[] tokenIds); event AdminTokenRecovered(address tokenRecovered, uint256 amount); event NewStartAndEndBlocks(uint256 startBlock, uint256 endBlock); event NewRewardPerBlock(uint256 rewardPerBlock); event RewardsStop(uint256 blockNumber); event EndBlockUpdated(uint256 blockNumber); event ServiceInfoUpadted(address _addr, uint256 _fee); event DurationUpdated(uint256 _duration); constructor() {} /* * @notice Initialize the contract * @param _stakingNft: nft address to stake * @param _earnedToken: earned token address * @param _rewardPerBlock: reward per block (in earnedToken) */ function initialize( IERC721 _stakingNft, IERC20 _earnedToken, uint256 _rewardPerBlock ) external onlyOwner { require(!isInitialized, "Already initialized"); // Make this contract initialized isInitialized = true; stakingNft = _stakingNft; earnedToken = _earnedToken; rewardPerBlock = _rewardPerBlock; uint256 decimalsRewardToken = uint256(IERC20Metadata(address(earnedToken)).decimals()); require(decimalsRewardToken < 30, "Must be inferior to 30"); PRECISION_FACTOR = uint256(10**(40 - decimalsRewardToken)); } /* * @notice Deposit staked tokens and collect reward tokens (if any) * @param _amount: amount to withdraw (in earnedToken) */ function deposit(uint256[] memory _tokenIds) external payable nonReentrant { require(startBlock > 0 && startBlock < block.number, "Staking hasn't started yet"); require(_tokenIds.length > 0, "must add at least one tokenId"); require(_tokenIds.length <= oneTimeLimit, "cannot exceed one-time limit"); _transferPerformanceFee(); _updatePool(); UserInfo storage user = userInfo[msg.sender]; if (user.amount > 0) { uint256 pending = (user.amount * accTokenPerShare) / PRECISION_FACTOR - user.rewardDebt; if (pending > 0) { require(availableRewardTokens() >= pending, "Insufficient reward tokens"); earnedToken.safeTransfer(address(msg.sender), pending); paidRewards += pending; emit Claim(msg.sender, pending); } } for (uint256 i = 0; i < _tokenIds.length; i++) { uint256 tokenId = _tokenIds[i]; stakingNft.safeTransferFrom(msg.sender, address(this), tokenId); user.tokenIds.push(tokenId); } user.amount = user.amount + _tokenIds.length; user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR; totalStaked = totalStaked + _tokenIds.length; emit Deposit(msg.sender, _tokenIds); } /* * @notice Withdraw staked tokenIds and collect reward tokens * @param _amount: number of tokenIds to unstake */ function withdraw(uint256 _amount) external payable nonReentrant { require(_amount > 0, "Amount should be greator than 0"); require(_amount <= oneTimeLimit, "cannot exceed one-time limit"); UserInfo storage user = userInfo[msg.sender]; require(user.amount >= _amount, "Amount to withdraw too high"); _transferPerformanceFee(); _updatePool(); if (user.amount > 0) { uint256 pending = (user.amount * accTokenPerShare) / PRECISION_FACTOR - user.rewardDebt; if (pending > 0) { require(availableRewardTokens() >= pending, "Insufficient reward tokens"); earnedToken.safeTransfer(address(msg.sender), pending); paidRewards += pending; emit Claim(msg.sender, pending); } } uint256[] memory _tokenIds = new uint256[](_amount); for (uint256 i = 0; i < _amount; i++) { uint256 tokenId = user.tokenIds[user.tokenIds.length - 1]; user.tokenIds.pop(); _tokenIds[i] = tokenId; stakingNft.safeTransferFrom(address(this), msg.sender, tokenId); } user.amount = user.amount - _amount; user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR; totalStaked = totalStaked - _amount; emit Withdraw(msg.sender, _tokenIds); } function claimReward() external payable nonReentrant { UserInfo storage user = userInfo[msg.sender]; _transferPerformanceFee(); _updatePool(); if (user.amount == 0) return; uint256 pending = (user.amount * accTokenPerShare) / PRECISION_FACTOR - user.rewardDebt; if (pending > 0) { require(availableRewardTokens() >= pending, "Insufficient reward tokens"); earnedToken.safeTransfer(address(msg.sender), pending); paidRewards += pending; } user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR; emit Claim(msg.sender, pending); } /* * @notice Withdraw staked NFTs without caring about rewards * @dev Needs to be for emergency. */ function emergencyWithdraw() external nonReentrant { UserInfo storage user = userInfo[msg.sender]; uint256 _amount = user.amount; if (_amount > oneTimeLimit) _amount = oneTimeLimit; uint256[] memory _tokenIds = new uint256[](_amount); for (uint256 i = 0; i < _amount; i++) { uint256 tokenId = user.tokenIds[user.tokenIds.length - 1]; user.tokenIds.pop(); _tokenIds[i] = tokenId; stakingNft.safeTransferFrom(address(this), msg.sender, tokenId); } user.amount = user.amount - _amount; user.rewardDebt = (user.amount * accTokenPerShare) / PRECISION_FACTOR; totalStaked = totalStaked - _amount; emit EmergencyWithdraw(msg.sender, _tokenIds); } function stakedInfo(address _user) external view returns (uint256, uint256[] memory) { return (userInfo[_user].amount, userInfo[_user].tokenIds); } /** * @notice Available amount of reward token */ function availableRewardTokens() public view returns (uint256) { return earnedToken.balanceOf(address(this)); } function insufficientRewards() external view returns (uint256) { uint256 adjustedShouldTotalPaid = shouldTotalPaid; uint256 remainRewards = availableRewardTokens() + paidRewards; if (startBlock == 0) { adjustedShouldTotalPaid += rewardPerBlock * duration * BLOCKS_PER_DAY; } else { uint256 remainBlocks = _getMultiplier(lastRewardBlock, bonusEndBlock); adjustedShouldTotalPaid += rewardPerBlock * remainBlocks; } if (remainRewards >= adjustedShouldTotalPaid) return 0; return adjustedShouldTotalPaid - remainRewards; } /* * @notice View function to see pending reward on frontend. * @param _user: user address * @return Pending reward for a given user */ function pendingReward(address _user) external view returns (uint256) { UserInfo storage user = userInfo[_user]; uint256 adjustedTokenPerShare = accTokenPerShare; if (block.number > lastRewardBlock && totalStaked != 0 && lastRewardBlock > 0) { uint256 multiplier = _getMultiplier(lastRewardBlock, block.number); uint256 rewards = multiplier * rewardPerBlock; adjustedTokenPerShare += (rewards * PRECISION_FACTOR) / totalStaked; } return (user.amount * adjustedTokenPerShare) / PRECISION_FACTOR - user.rewardDebt; } /************************ ** Admin Methods *************************/ function increaseEmissionRate(uint256 _amount) external onlyOwner { require(startBlock > 0, "pool is not started"); require(bonusEndBlock > block.number, "pool was already finished"); require(_amount > 0, "invalid amount"); _updatePool(); earnedToken.safeTransferFrom(msg.sender, address(this), _amount); uint256 remainRewards = availableRewardTokens() + paidRewards; if (remainRewards > shouldTotalPaid) { remainRewards = remainRewards - shouldTotalPaid; uint256 remainBlocks = bonusEndBlock - block.number; rewardPerBlock = remainRewards / remainBlocks; emit NewRewardPerBlock(rewardPerBlock); } } /* * @notice Withdraw reward token * @dev Only callable by owner. Needs to be for emergency. */ function emergencyRewardWithdraw(uint256 _amount) external onlyOwner { require(block.number > bonusEndBlock, "Pool is running"); require(availableRewardTokens() >= _amount, "Insufficient reward tokens"); if (_amount == 0) _amount = availableRewardTokens(); earnedToken.safeTransfer(address(msg.sender), _amount); } function startReward() external onlyOwner { require(startBlock == 0, "Pool was already started"); startBlock = block.number + 100; bonusEndBlock = startBlock + duration * BLOCKS_PER_DAY; lastRewardBlock = startBlock; emit NewStartAndEndBlocks(startBlock, bonusEndBlock); } function stopReward() external onlyOwner { _updatePool(); uint256 remainRewards = availableRewardTokens() + paidRewards; if (remainRewards > shouldTotalPaid) { remainRewards = remainRewards - shouldTotalPaid; earnedToken.transfer(msg.sender, remainRewards); } bonusEndBlock = block.number; emit RewardsStop(bonusEndBlock); } function updateEndBlock(uint256 _endBlock) external onlyOwner { require(startBlock > 0, "Pool is not started"); require(bonusEndBlock > block.number, "Pool was already finished"); require(_endBlock > block.number && _endBlock > startBlock, "Invalid end block"); bonusEndBlock = _endBlock; emit EndBlockUpdated(_endBlock); } /* * @notice Update reward per block * @dev Only callable by owner. * @param _rewardPerBlock: the reward per block */ function updateRewardPerBlock(uint256 _rewardPerBlock) external onlyOwner { rewardPerBlock = _rewardPerBlock; emit NewRewardPerBlock(_rewardPerBlock); } function setDuration(uint256 _duration) external onlyOwner { require(_duration >= 30, "lower limit reached"); duration = _duration; if (startBlock > 0) { bonusEndBlock = startBlock + duration * BLOCKS_PER_DAY; require(bonusEndBlock > block.number, "invalid duration"); } emit DurationUpdated(_duration); } function setServiceInfo(address _treasury, uint256 _fee) external { require(msg.sender == treasury, "setServiceInfo: FORBIDDEN"); require(_treasury != address(0x0), "Invalid address"); treasury = _treasury; performanceFee = _fee; emit ServiceInfoUpadted(_treasury, _fee); } /** * @notice It allows the admin to recover wrong tokens sent to the contract * @param _token: the address of the token to withdraw * @dev This function is only callable by admin. */ function rescueTokens(address _token) external onlyOwner { require(_token != address(earnedToken), "Cannot be reward token"); uint256 amount = address(this).balance; if (_token == address(0x0)) { payable(msg.sender).transfer(amount); } else { amount = IERC20(_token).balanceOf(address(this)); IERC20(_token).safeTransfer(address(msg.sender), amount); } emit AdminTokenRecovered(_token, amount); } /************************ ** Internal Methods *************************/ /* * @notice Update reward variables of the given pool to be up-to-date. */ function _updatePool() internal { if (block.number <= lastRewardBlock || lastRewardBlock == 0) return; if (totalStaked == 0) { lastRewardBlock = block.number; return; } uint256 multiplier = _getMultiplier(lastRewardBlock, block.number); uint256 _reward = multiplier * rewardPerBlock; accTokenPerShare += (_reward * PRECISION_FACTOR) / totalStaked; lastRewardBlock = block.number; shouldTotalPaid += _reward; } /* * @notice Return reward multiplier over the given _from to _to block. * @param _from: block to start * @param _to: block to finish */ function _getMultiplier(uint256 _from, uint256 _to) internal view returns (uint256) { if (_to <= bonusEndBlock) { return _to - _from; } else if (_from >= bonusEndBlock) { return 0; } else { return bonusEndBlock - _from; } } function _transferPerformanceFee() internal { require(msg.value >= performanceFee, "should pay small gas to compound or harvest"); payable(treasury).transfer(performanceFee); if (msg.value > performanceFee) { payable(msg.sender).transfer(msg.value - performanceFee); } } /** * onERC721Received(address operator, address from, uint256 tokenId, bytes data) → bytes4 * 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. */ function onERC721Received( address, address, uint256, bytes calldata ) external view override returns (bytes4) { require(msg.sender == address(stakingNft), "not enabled NFT"); return _ERC721_RECEIVED; } receive() external payable {} }
// 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); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// 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; }
// 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// 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; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// 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); }
// 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); } } } }
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Contract Security Audit
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Contract Creation Code
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.