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Latest 25 from a total of 1,218 transactions
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Withdraw | 14441995 | 988 days ago | IN | 0 ETH | 0.00206181 | ||||
Withdraw | 14434839 | 989 days ago | IN | 0 ETH | 0.00388749 | ||||
Withdraw | 14376128 | 998 days ago | IN | 0 ETH | 0.00173209 | ||||
Withdraw | 14373624 | 998 days ago | IN | 0 ETH | 0.00298968 | ||||
Withdraw | 14361899 | 1000 days ago | IN | 0 ETH | 0.00300518 | ||||
Deposit | 14324962 | 1006 days ago | IN | 0 ETH | 0.00513055 | ||||
Withdraw | 14307795 | 1009 days ago | IN | 0 ETH | 0.00407317 | ||||
Withdraw | 14304346 | 1009 days ago | IN | 0 ETH | 0.00889819 | ||||
Withdraw | 14282142 | 1013 days ago | IN | 0 ETH | 0.00676551 | ||||
Withdraw | 14233299 | 1020 days ago | IN | 0 ETH | 0.01531881 | ||||
Withdraw | 14176732 | 1029 days ago | IN | 0 ETH | 0.00480139 | ||||
Withdraw | 14145096 | 1034 days ago | IN | 0 ETH | 0.00906153 | ||||
Withdraw | 14053958 | 1048 days ago | IN | 0 ETH | 0.02810363 | ||||
Withdraw | 14053926 | 1048 days ago | IN | 0 ETH | 0.0268045 | ||||
Withdraw | 14019463 | 1053 days ago | IN | 0 ETH | 0.01097901 | ||||
Withdraw | 14008573 | 1055 days ago | IN | 0 ETH | 0.01794267 | ||||
Withdraw | 13980411 | 1059 days ago | IN | 0 ETH | 0.02673379 | ||||
Withdraw | 13961043 | 1062 days ago | IN | 0 ETH | 0.02137553 | ||||
Manual Epoch Ini... | 13959653 | 1062 days ago | IN | 0 ETH | 0.01143971 | ||||
Withdraw | 13948696 | 1064 days ago | IN | 0 ETH | 0.02842322 | ||||
Withdraw | 13886669 | 1074 days ago | IN | 0 ETH | 0.00431769 | ||||
Withdraw | 13871098 | 1076 days ago | IN | 0 ETH | 0.00583677 | ||||
Withdraw | 13860583 | 1078 days ago | IN | 0 ETH | 0.00751724 | ||||
Withdraw | 13854667 | 1079 days ago | IN | 0 ETH | 0.0062432 | ||||
Withdraw | 13835609 | 1082 days ago | IN | 0 ETH | 0.00446711 |
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Contract Name:
Staking2
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: Apache-2.0 pragma solidity ^0.6.11; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/math/SafeMath.sol"; import "@openzeppelin/contracts/utils/ReentrancyGuard.sol"; import "../lib/BlackholePrevention.sol"; contract Staking2 is Ownable, ReentrancyGuard, BlackholePrevention { using SafeMath for uint256; uint128 constant private BASE_MULTIPLIER = uint128(1 * 10 ** 18); bool internal _paused; // timestamp for the epoch 1 // everything before that is considered epoch 0 which won't have a reward but allows for the initial stake uint256 public immutable epoch1Start; // duration of each epoch uint256 public immutable epochDuration; // holds the current balance of the user for each token mapping(address => mapping(address => uint256)) private balances; struct Pool { uint256 size; bool set; } // for each token, we store the total pool size mapping(address => mapping(uint256 => Pool)) private poolSize; // a checkpoint of the valid balance of a user for an epoch struct Checkpoint { uint128 epochId; uint128 multiplier; uint256 startBalance; uint256 newDeposits; } // balanceCheckpoints[user][token][] mapping(address => mapping(address => Checkpoint[])) private balanceCheckpoints; mapping(address => uint128) private lastWithdrawEpochId; event PausedStateSet(bool isPaused); event Deposit(address indexed user, address indexed tokenAddress, uint256 amount); event Withdraw(address indexed user, address indexed tokenAddress, uint256 amount); event ManualEpochInit(address indexed caller, uint128 indexed epochId, address[] tokens); event EmergencyWithdraw(address indexed user, address indexed tokenAddress, uint256 amount); constructor (uint256 _epoch1Start, uint256 _epochDuration) public { _paused = false; epoch1Start = _epoch1Start; epochDuration = _epochDuration; } function isPaused() external view returns (bool) { return _paused; } /* * Stores `amount` of `tokenAddress` tokens for the `user` into the vault */ function deposit(address tokenAddress, uint256 amount) public nonReentrant whenNotPaused { require(amount > 0, "STK:E-205"); IERC20 token = IERC20(tokenAddress); balances[msg.sender][tokenAddress] = balances[msg.sender][tokenAddress].add(amount); token.transferFrom(msg.sender, address(this), amount); // epoch logic uint128 currentEpoch = getCurrentEpoch(); uint128 currentMultiplier = currentEpochMultiplier(); uint256 balance = balances[msg.sender][tokenAddress]; if (!epochIsInitialized(tokenAddress, currentEpoch)) { address[] memory tokens = new address[](1); tokens[0] = tokenAddress; manualEpochInit(tokens, currentEpoch); } // update the next epoch pool size Pool storage pNextEpoch = poolSize[tokenAddress][currentEpoch + 1]; pNextEpoch.size = token.balanceOf(address(this)); pNextEpoch.set = true; Checkpoint[] storage checkpoints = balanceCheckpoints[msg.sender][tokenAddress]; uint256 balanceBefore = getEpochUserBalance(msg.sender, tokenAddress, currentEpoch); // if there's no checkpoint yet, it means the user didn't have any activity // we want to store checkpoints both for the current epoch and next epoch because // if a user does a withdraw, the current epoch can also be modified and // we don't want to insert another checkpoint in the middle of the array as that could be expensive if (checkpoints.length == 0) { checkpoints.push(Checkpoint(currentEpoch, currentMultiplier, 0, amount)); // next epoch => multiplier is 1, epoch deposits is 0 checkpoints.push(Checkpoint(currentEpoch + 1, BASE_MULTIPLIER, amount, 0)); } else { uint256 last = checkpoints.length - 1; // the last action happened in an older epoch (e.g. a deposit in epoch 3, current epoch is >=5) if (checkpoints[last].epochId < currentEpoch) { uint128 multiplier = computeNewMultiplier( getCheckpointBalance(checkpoints[last]), BASE_MULTIPLIER, amount, currentMultiplier ); checkpoints.push(Checkpoint(currentEpoch, multiplier, getCheckpointBalance(checkpoints[last]), amount)); checkpoints.push(Checkpoint(currentEpoch + 1, BASE_MULTIPLIER, balance, 0)); } // the last action happened in the previous epoch else if (checkpoints[last].epochId == currentEpoch) { checkpoints[last].multiplier = computeNewMultiplier( getCheckpointBalance(checkpoints[last]), checkpoints[last].multiplier, amount, currentMultiplier ); checkpoints[last].newDeposits = checkpoints[last].newDeposits.add(amount); checkpoints.push(Checkpoint(currentEpoch + 1, BASE_MULTIPLIER, balance, 0)); } // the last action happened in the current epoch else { if (last >= 1 && checkpoints[last - 1].epochId == currentEpoch) { checkpoints[last - 1].multiplier = computeNewMultiplier( getCheckpointBalance(checkpoints[last - 1]), checkpoints[last - 1].multiplier, amount, currentMultiplier ); checkpoints[last - 1].newDeposits = checkpoints[last - 1].newDeposits.add(amount); } checkpoints[last].startBalance = balance; } } uint256 balanceAfter = getEpochUserBalance(msg.sender, tokenAddress, currentEpoch); poolSize[tokenAddress][currentEpoch].size = poolSize[tokenAddress][currentEpoch].size.add(balanceAfter.sub(balanceBefore)); emit Deposit(msg.sender, tokenAddress, amount); } /* * Removes the deposit of the user and sends the amount of `tokenAddress` back to the `user` */ function withdraw(address tokenAddress, uint256 amount) public nonReentrant { require(balances[msg.sender][tokenAddress] >= amount, "STK:E-432"); balances[msg.sender][tokenAddress] = balances[msg.sender][tokenAddress].sub(amount); IERC20 token = IERC20(tokenAddress); token.transfer(msg.sender, amount); // epoch logic uint128 currentEpoch = getCurrentEpoch(); lastWithdrawEpochId[tokenAddress] = currentEpoch; if (!epochIsInitialized(tokenAddress, currentEpoch)) { address[] memory tokens = new address[](1); tokens[0] = tokenAddress; manualEpochInit(tokens, currentEpoch); } // update the pool size of the next epoch to its current balance Pool storage pNextEpoch = poolSize[tokenAddress][currentEpoch + 1]; pNextEpoch.size = token.balanceOf(address(this)); pNextEpoch.set = true; Checkpoint[] storage checkpoints = balanceCheckpoints[msg.sender][tokenAddress]; uint256 last = checkpoints.length - 1; // note: it's impossible to have a withdraw and no checkpoints because the checkpoints[last] will be out of bound and revert // there was a deposit in an older epoch (more than 1 behind [eg: previous 0, now 5]) but no other action since then if (checkpoints[last].epochId < currentEpoch) { checkpoints.push(Checkpoint(currentEpoch, BASE_MULTIPLIER, balances[msg.sender][tokenAddress], 0)); poolSize[tokenAddress][currentEpoch].size = poolSize[tokenAddress][currentEpoch].size.sub(amount); } // there was a deposit in the `epochId - 1` epoch => we have a checkpoint for the current epoch else if (checkpoints[last].epochId == currentEpoch) { checkpoints[last].startBalance = balances[msg.sender][tokenAddress]; checkpoints[last].newDeposits = 0; checkpoints[last].multiplier = BASE_MULTIPLIER; poolSize[tokenAddress][currentEpoch].size = poolSize[tokenAddress][currentEpoch].size.sub(amount); } // there was a deposit in the current epoch else { Checkpoint storage currentEpochCheckpoint = checkpoints[last - 1]; uint256 balanceBefore = getCheckpointEffectiveBalance(currentEpochCheckpoint); // in case of withdraw, we have 2 branches: // 1. the user withdraws less than he added in the current epoch // 2. the user withdraws more than he added in the current epoch (including 0) if (amount < currentEpochCheckpoint.newDeposits) { uint128 avgDepositMultiplier = uint128( balanceBefore.sub(currentEpochCheckpoint.startBalance).mul(BASE_MULTIPLIER).div(currentEpochCheckpoint.newDeposits) ); currentEpochCheckpoint.newDeposits = currentEpochCheckpoint.newDeposits.sub(amount); currentEpochCheckpoint.multiplier = computeNewMultiplier( currentEpochCheckpoint.startBalance, BASE_MULTIPLIER, currentEpochCheckpoint.newDeposits, avgDepositMultiplier ); } else { currentEpochCheckpoint.startBalance = currentEpochCheckpoint.startBalance.sub( amount.sub(currentEpochCheckpoint.newDeposits) ); currentEpochCheckpoint.newDeposits = 0; currentEpochCheckpoint.multiplier = BASE_MULTIPLIER; } uint256 balanceAfter = getCheckpointEffectiveBalance(currentEpochCheckpoint); poolSize[tokenAddress][currentEpoch].size = poolSize[tokenAddress][currentEpoch].size.sub(balanceBefore.sub(balanceAfter)); checkpoints[last].startBalance = balances[msg.sender][tokenAddress]; } emit Withdraw(msg.sender, tokenAddress, amount); } /* * manualEpochInit can be used by anyone to initialize an epoch based on the previous one * This is only applicable if there was no action (deposit/withdraw) in the current epoch. * Any deposit and withdraw will automatically initialize the current and next epoch. */ function manualEpochInit(address[] memory tokens, uint128 epochId) public whenNotPaused { require(epochId <= getCurrentEpoch(), "STK:E-306"); for (uint i = 0; i < tokens.length; i++) { Pool storage p = poolSize[tokens[i]][epochId]; if (epochId == 0) { p.size = uint256(0); p.set = true; } else { require(!epochIsInitialized(tokens[i], epochId), "STK:E-002"); require(epochIsInitialized(tokens[i], epochId - 1), "STK:E-305"); p.size = poolSize[tokens[i]][epochId - 1].size; p.set = true; } } emit ManualEpochInit(msg.sender, epochId, tokens); } function emergencyWithdraw(address tokenAddress) public { require((getCurrentEpoch() - lastWithdrawEpochId[tokenAddress]) >= 10, "STK:E-304"); uint256 totalUserBalance = balances[msg.sender][tokenAddress]; require(totalUserBalance > 0, "STK:E-205"); balances[msg.sender][tokenAddress] = 0; IERC20 token = IERC20(tokenAddress); token.transfer(msg.sender, totalUserBalance); emit EmergencyWithdraw(msg.sender, tokenAddress, totalUserBalance); } /* * Returns the valid balance of a user that was taken into consideration in the total pool size for the epoch * A deposit will only change the next epoch balance. * A withdraw will decrease the current epoch (and subsequent) balance. */ function getEpochUserBalance(address user, address token, uint128 epochId) public view returns (uint256) { Checkpoint[] storage checkpoints = balanceCheckpoints[user][token]; // if there are no checkpoints, it means the user never deposited any tokens, so the balance is 0 if (checkpoints.length == 0 || epochId < checkpoints[0].epochId) { return 0; } uint min = 0; uint max = checkpoints.length - 1; // shortcut for blocks newer than the latest checkpoint == current balance if (epochId >= checkpoints[max].epochId) { return getCheckpointEffectiveBalance(checkpoints[max]); } // binary search of the value in the array while (max > min) { uint mid = (max + min + 1) / 2; if (checkpoints[mid].epochId <= epochId) { min = mid; } else { max = mid - 1; } } return getCheckpointEffectiveBalance(checkpoints[min]); } /* * Returns the amount of `token` that the `user` has currently staked */ function balanceOf(address user, address token) public view returns (uint256) { return balances[user][token]; } /* * Returns the id of the current epoch derived from block.timestamp */ function getCurrentEpoch() public view returns (uint128) { if (block.timestamp < epoch1Start) { return 0; } return uint128((block.timestamp - epoch1Start) / epochDuration + 1); } /* * Returns the total amount of `tokenAddress` that was locked from beginning to end of epoch identified by `epochId` */ function getEpochPoolSize(address tokenAddress, uint128 epochId) public view returns (uint256) { // Premises: // 1. it's impossible to have gaps of uninitialized epochs // - any deposit or withdraw initialize the current epoch which requires the previous one to be initialized if (epochIsInitialized(tokenAddress, epochId)) { return poolSize[tokenAddress][epochId].size; } // epochId not initialized and epoch 0 not initialized => there was never any action on this pool if (!epochIsInitialized(tokenAddress, 0)) { return 0; } // epoch 0 is initialized => there was an action at some point but none that initialized the epochId // which means the current pool size is equal to the current balance of token held by the staking contract IERC20 token = IERC20(tokenAddress); return token.balanceOf(address(this)); } /* * Returns the percentage of time left in the current epoch */ function currentEpochMultiplier() public view returns (uint128) { uint128 currentEpoch = getCurrentEpoch(); uint256 currentEpochEnd = epoch1Start + currentEpoch * epochDuration; uint256 timeLeft = currentEpochEnd - block.timestamp; uint128 multiplier = uint128(timeLeft * BASE_MULTIPLIER / epochDuration); return multiplier; } function computeNewMultiplier(uint256 prevBalance, uint128 prevMultiplier, uint256 amount, uint128 currentMultiplier) public pure returns (uint128) { uint256 prevAmount = prevBalance.mul(prevMultiplier).div(BASE_MULTIPLIER); uint256 addAmount = amount.mul(currentMultiplier).div(BASE_MULTIPLIER); uint128 newMultiplier = uint128(prevAmount.add(addAmount).mul(BASE_MULTIPLIER).div(prevBalance.add(amount))); return newMultiplier; } /* * Checks if an epoch is initialized, meaning we have a pool size set for it */ function epochIsInitialized(address token, uint128 epochId) public view returns (bool) { return poolSize[token][epochId].set; } function getCheckpointBalance(Checkpoint memory c) internal pure returns (uint256) { return c.startBalance.add(c.newDeposits); } function getCheckpointEffectiveBalance(Checkpoint memory c) internal pure returns (uint256) { return getCheckpointBalance(c).mul(c.multiplier).div(BASE_MULTIPLIER); } /***********************************| | Only Admin/DAO | |__________________________________*/ function setPausedState(bool paused) external onlyOwner { _paused = paused; emit PausedStateSet(paused); } // Note: This contract should never hold ETH, if any is accidentally sent in then the DAO can return it function withdrawEther(address payable receiver, uint256 amount) external virtual onlyOwner { _withdrawEther(receiver, amount); } modifier whenNotPaused() { require(_paused != true, "STK:E-101"); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "../GSN/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. */ 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 () internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view 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 { emit OwnershipTransferred(_owner, address(0)); _owner = 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"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @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 pragma solidity ^0.6.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @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]. */ 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 () internal { _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 make 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 // BlackholePrevention.sol -- Part of the Charged Particles Protocol // Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi> // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in all // copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE // SOFTWARE. pragma solidity >=0.6.0; import "@openzeppelin/contracts/utils/Address.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; /** * @notice Prevents ETH or Tokens from getting stuck in a contract by allowing * the Owner/DAO to pull them out on behalf of a user * This is only meant to contracts that are not expected to hold tokens, but do handle transferring them. */ contract BlackholePrevention { using Address for address payable; using SafeERC20 for IERC20; event WithdrawStuckEther(address indexed receiver, uint256 amount); event WithdrawStuckERC20(address indexed receiver, address indexed tokenAddress, uint256 amount); event WithdrawStuckERC721(address indexed receiver, address indexed tokenAddress, uint256 indexed tokenId); function _withdrawEther(address payable receiver, uint256 amount) internal virtual { require(receiver != address(0x0), "BHP:E-403"); if (address(this).balance >= amount) { receiver.sendValue(amount); emit WithdrawStuckEther(receiver, amount); } } function _withdrawERC20(address payable receiver, address tokenAddress, uint256 amount) internal virtual { require(receiver != address(0x0), "BHP:E-403"); if (IERC20(tokenAddress).balanceOf(address(this)) >= amount) { IERC20(tokenAddress).safeTransfer(receiver, amount); emit WithdrawStuckERC20(receiver, tokenAddress, amount); } } function _withdrawERC721(address payable receiver, address tokenAddress, uint256 tokenId) internal virtual { require(receiver != address(0x0), "BHP:E-403"); if (IERC721(tokenAddress).ownerOf(tokenId) == address(this)) { IERC721(tokenAddress).transferFrom(address(this), receiver, tokenId); emit WithdrawStuckERC721(receiver, tokenAddress, tokenId); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /* * @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 GSN 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 payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; /** * @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) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @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"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (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"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./IERC20.sol"; import "../../math/SafeMath.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 SafeMath for uint256; 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' // solhint-disable-next-line max-line-length 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).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _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 // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; import "../../introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transfered 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 pragma solidity ^0.6.0; /** * @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); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
Contract Security Audit
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payable","name":"receiver","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawEther","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000000000000000000000000000000000000612416640000000000000000000000000000000000000000000000000000000000093a80
-----Decoded View---------------
Arg [0] : _epoch1Start (uint256): 1629754980
Arg [1] : _epochDuration (uint256): 604800
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000061241664
Arg [1] : 0000000000000000000000000000000000000000000000000000000000093a80
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | 100.00% | $0.008227 | 102,440.6034 | $842.76 |
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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.