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Latest 25 from a total of 1,164 transactions
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Withdraw Pool | 19020345 | 172 days ago | IN | 0 ETH | 0.00246594 | ||||
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Contract Name:
Staking
Compiler Version
v0.8.3+commit.8d00100c
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.3; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "./Staking/CappedRewardCalculator.sol"; import "./ClaimsRegistry.sol"; /// @title A staking contract which allows only verified users (by checking a separate contract for a valid signature) /// @author Miguel Palhas <[email protected]> contract Staking is CappedRewardCalculator, Ownable { /// @notice the token to stake ERC20 public immutable erc20; /// @notice claim registry where signatures are to be stored and verified IClaimsRegistryVerifier public immutable registry; /// @notice The expected attester address against which claims will be verified /// (i.e. they must be signed by this address) address public immutable claimAttester; /// @notice The minimum staking amount per account uint public immutable minAmount; /// @notice The maximum staking amount per account uint public immutable maxAmount; /// @notice Locked rewards pending withdrawal uint public lockedReward = 0; /// @notice Rewards already distributed uint public distributedReward = 0; /// @notice How much is currently staked uint public stakedAmount = 0; /// @notice Subscription details for each account mapping(address => Subscription) public subscriptions; /// @notice Emitted when an account stakes tokens and creates a new subscription event Subscribed( address subscriber, uint date, uint stakedAmount, uint maxReward ); /// @notice Emitted when an account withdraws an existing stake event Withdrawn( address subscriber, uint date, uint withdrawAmount ); /// @notice Details of a particular subscription struct Subscription { bool active; address subscriberAddress; // addres the subscriptions refers to uint startDate; // Block timestamp at which the subscription was made uint stakedAmount; // How much was staked uint maxReward; // Maximum reward given if user stays until the end of the staking period uint withdrawAmount; // Total amount withdrawn (initial amount + final calculated reward) uint withdrawDate; // Block timestamp at which the subscription was withdrawn (or 0 while staking is in progress) } /// @notice Staking constructor /// @param _token ERC20 token address to use /// @param _registry ClaimsRegistry address to use /// @param _attester expected attester of claims when verifying them /// @param _startDate timestamp starting at which stakes are allowed. Must be greater than instantiation timestamp /// @param _endDate timestamp at which staking is over (no more rewards are given, and new stakes are not allowed) /// @param _minAmount minimum staking amount for each account /// @param _maxAmount maximum staking amount for each account /// @param _cap max % of individual reward for curve period constructor( address _token, address _registry, address _attester, uint _startDate, uint _endDate, uint _minAmount, uint _maxAmount, uint _cap ) CappedRewardCalculator(_startDate, _endDate, _cap) { require(_token != address(0), "Staking: token address cannot be 0x0"); require(_registry != address(0), "Staking: claims registry address cannot be 0x0"); require(_attester != address(0), "Staking: claim attester cannot be 0x0"); require(block.timestamp <= _startDate, "Staking: start date must be in the future"); require(_minAmount > 0, "Staking: invalid individual min amount"); require(_maxAmount > _minAmount, "Staking: max amount must be higher than min amount"); erc20 = ERC20(_token); registry = IClaimsRegistryVerifier(_registry); claimAttester = _attester; minAmount = _minAmount; maxAmount = _maxAmount; } /// @notice Get the total size of the reward pool /// @return Returns the total size of the reward pool, including locked and distributed tokens function totalPool() public view returns (uint) { return erc20.balanceOf(address(this)) - stakedAmount + distributedReward; } /// @notice Get the available size of the reward pool /// @return Returns the available size of the reward pool, no including locked or distributed rewards function availablePool() public view returns (uint) { return erc20.balanceOf(address(this)) - stakedAmount - lockedReward; } /// @notice Requests a new stake to be created. Only one stake per account is /// created, maximum rewards are calculated upfront, and a valid claim /// signature needs to be provided, which will be checked against the expected /// attester on the registry contract /// @param _amount Amount of tokens to stake /// @param claimSig Signature to check against the registry contract function stake(uint _amount, bytes calldata claimSig) external { uint time = block.timestamp; address subscriber = msg.sender; require(registry.verifyClaim(msg.sender, claimAttester, claimSig), "Staking: could not verify claim"); require(_amount >= minAmount, "Staking: staked amount needs to be greater than or equal to minimum amount"); require(_amount <= maxAmount, "Staking: staked amount needs to be lower than or equal to maximum amount"); require(time >= startDate, "Staking: staking period not started"); require(time < endDate, "Staking: staking period finished"); require(subscriptions[subscriber].active == false, "Staking: this account has already staked"); uint maxReward = calculateReward(time, endDate, _amount); require(maxReward <= availablePool(), "Staking: not enough tokens available in the pool"); lockedReward += maxReward; stakedAmount += _amount; subscriptions[subscriber] = Subscription( true, subscriber, time, _amount, maxReward, 0, 0 ); // transfer tokens from subscriber to the contract require(erc20.transferFrom(subscriber, address(this), _amount), "Staking: Could not transfer tokens from subscriber"); emit Subscribed(subscriber, time, _amount, maxReward); } /// @notice Withdrawn the stake belonging to `msg.sender` function withdraw() external { address subscriber = msg.sender; uint time = block.timestamp; require(subscriptions[subscriber].active == true, "Staking: no active subscription found for this address"); Subscription memory sub = subscriptions[subscriber]; uint actualReward = calculateReward(sub.startDate, time, sub.stakedAmount); uint total = sub.stakedAmount + actualReward; // update subscription state sub.withdrawAmount = total; sub.withdrawDate = time; sub.active = false; subscriptions[subscriber] = sub; // update locked amount lockedReward -= sub.maxReward; distributedReward += actualReward; stakedAmount -= sub.stakedAmount; // transfer tokens back to subscriber require(erc20.transfer(subscriber, total), "Staking: Transfer has failed"); emit Withdrawn(subscriber, time, total); } /// @notice returns the initial amount staked by a given account /// @param _subscriber The account to check /// @return The amount that was staked by the given account function getStakedAmount(address _subscriber) external view returns (uint) { if (subscriptions[_subscriber].stakedAmount > 0 && subscriptions[_subscriber].withdrawDate == 0) { return subscriptions[_subscriber].stakedAmount; } else { return 0; } } /// @notice Gets the maximum reward for an existing subscription /// @param _subscriber address of the subscription to check /// @return Maximum amount of tokens the subscriber can get by staying until the end of the staking period function getMaxStakeReward(address _subscriber) external view returns (uint) { Subscription memory sub = subscriptions[_subscriber]; if (sub.active) { return subscriptions[_subscriber].maxReward; } else { return 0; } } /// @notice Gets the amount already earned by an existing subscription /// @param _subscriber address of the subscription to check /// @return Amount the subscriber has earned to date function getCurrentReward(address _subscriber) external view returns (uint) { Subscription memory sub = subscriptions[_subscriber]; if (sub.active) { return calculateReward(sub.startDate, block.timestamp, sub.stakedAmount); } else { return 0; } } /// @notice Withdraws all unlocked tokens from the pool to the owner. Only works if staking period has already ended function withdrawPool() external onlyOwner { require(block.timestamp > endDate, "Staking: staking not over yet"); erc20.transfer(owner(), availablePool()); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The defaut value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overloaded; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); _approve(sender, _msgSender(), currentAllowance - amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); _approve(_msgSender(), spender, currentAllowance - subtractedValue); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); _balances[sender] = senderBalance - amount; _balances[recipient] += amount; emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); _balances[account] = accountBalance - amount; _totalSupply -= amount; emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } }
// SPDX-License-Identifier: MIT 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 () { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), 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 { 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 ^0.8.3; /// @title Calculates rewards based on an initial downward curve period, and a second constant period /// @notice Calculation of the reward is based on a few rules: /// * start and end date of the staking period (the earlier you enter, and /// the longer you stay, the greater your overall reward) /// /// * At each point, the the current reward is described by a downward curve /// (https://www.desmos.com/calculator/dz8vk1urep) /// /// * Computing your total reward (which is done upfront in order to lock and /// guarantee your reward) means computing the integral of the curve period from /// your enter date until the end /// (https://www.wolframalpha.com/input/?i=integrate+%28100-x%29%5E2) /// /// * This integral is the one being calculated in the `integralAtPoint` function /// /// * Besides this rule, rewards are also capped by a maximum percentage /// provided at contract instantiation time (a cap of 40 means your maximum /// possible reward is 40% of your initial stake /// /// @author Miguel Palhas <[email protected]> contract CappedRewardCalculator { /// @notice start of the staking period uint public immutable startDate; /// @notice end of the staking period uint public immutable endDate; /// @notice Reward cap for curve period uint public immutable cap; uint constant private year = 365 days; uint constant private day = 1 days; uint private constant mul = 1000000; /// @notice constructor /// @param _start The start timestamp for staking /// @param _start The end timestamp for staking /// @param _cap The cap percentage of the reward (40 == maximum of 40% of your initial stake) constructor( uint _start, uint _end, uint _cap ) { require(block.timestamp <= _start, "CappedRewardCalculator: start date must be in the future"); require( _start < _end, "CappedRewardCalculator: end date must be after start date" ); require(_cap > 0, "CappedRewardCalculator: curve cap cannot be 0"); startDate = _start; endDate = _end; cap = _cap; } /// @notice Given a timestamp range and an amount, calculates the expected nominal return /// @param _start The start timestamp to consider /// @param _end The end timestamp to consider /// @param _amount The amount to stake /// @return The nominal amount of the reward function calculateReward( uint _start, uint _end, uint _amount ) public view returns (uint) { (uint start, uint end) = truncatePeriod(_start, _end); (uint startPercent, uint endPercent) = toPeriodPercents(start, end); uint percentage = curvePercentage(startPercent, endPercent); uint reward = _amount * cap * percentage / (mul * 100); return reward; } /// @notice Estimates the current offered APY /// @return The estimated APY (40 == 40%) function currentAPY() public view returns (uint) { uint amount = 100 ether; uint today = block.timestamp; if (today < startDate) { today = startDate; } uint todayReward = calculateReward(startDate, today, amount); uint tomorrow = today + day; uint tomorrowReward = calculateReward(startDate, tomorrow, amount); uint delta = tomorrowReward - todayReward; uint apy = delta * 365 * 100 / amount; return apy; } function toPeriodPercents( uint _start, uint _end ) internal view returns (uint, uint) { uint totalDuration = endDate - startDate; if (totalDuration == 0) { return (0, mul); } uint startPercent = (_start - startDate) * mul / totalDuration; uint endPercent = (_end - startDate) * mul / totalDuration; return (startPercent, endPercent); } function truncatePeriod( uint _start, uint _end ) internal view returns (uint, uint) { if (_end <= startDate || _start >= endDate) { return (startDate, startDate); } uint start = _start < startDate ? startDate : _start; uint end = _end > endDate ? endDate : _end; return (start, end); } function curvePercentage(uint _start, uint _end) internal pure returns (uint) { int maxArea = integralAtPoint(mul) - integralAtPoint(0); int actualArea = integralAtPoint(_end) - integralAtPoint(_start); uint ratio = uint(actualArea * int(mul) / maxArea); return ratio; } function integralAtPoint(uint _x) internal pure returns (int) { int x = int(_x); int p1 = ((x - int(mul)) ** 3) / (3 * int(mul)); return p1; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.3; import "./ClaimsRegistry/Verifier.sol"; /// @title The claim verification interface expected by the Staking contract /// @author Miguel Palhas <[email protected]> interface IClaimsRegistryVerifier { /// @notice Verifies that the given `sig` corresponds to a claim about `subject`, signed by `attester` /// @param subject The subject the claim refers to /// @param attester The account that is expected to have signed the claim /// @param sig The signature /// @return Whether a claim about `subject` and signed by `attester` does exist and matches `sig` function verifyClaim(address subject, address attester, bytes calldata sig) external view returns (bool); } /// @title A claim registry. Does not actually store data, but only signatures of claims and their subjects /// @author Miguel Palhas <[email protected]> contract ClaimsRegistry is IClaimsRegistryVerifier, Verifier { /// @notice The mapping of keys to claims mapping(bytes32 => Claim) public registry; /// @notice Struct containing all public data about a claim (currently only the subject) struct Claim { address subject; // Subject the claim refers to bool revoked; // Whether the claim is revoked or not } /// @notice Emitted when a signed claim is successfuly stored event ClaimStored( bytes sig ); /// @notice Emitted when a previously stored claim is successfuly revoked by the attester event ClaimRevoked( bytes sig ); /// @notice Stores a claim about `subject`, signed by `attester`. Instead of /// actual data, receives only `claimHash` and `sig`, and checks whether the /// signature matches the expected key, and is signed by `attester` /// @param subject Account the claim refers to /// @param attester Account that signed the claim /// @param claimHash the claimHash that was signed along with the subject /// @param sig The given signature that must match (`subject`, `claimhash`) function setClaimWithSignature( address subject, address attester, bytes32 claimHash, bytes calldata sig ) public { bytes32 signable = computeSignableKey(subject, claimHash); require(verifyWithPrefix(signable, sig, attester), "ClaimsRegistry: Claim signature does not match attester"); bytes32 key = computeKey(attester, sig); registry[key] = Claim(subject, false); emit ClaimStored(sig); } /// @notice Checks if a claim signature is valid and stored, and returns the corresponding subject /// @param attester Account that signed the claim /// @param sig The given signature that must match keccak256([`subject`, `claimhash`]) /// @return The subject of the claim, or address(0) if none was found function getClaim( address attester, bytes calldata sig ) public view returns (address) { bytes32 key = keccak256(abi.encodePacked(attester, sig)); if (registry[key].revoked) { return address(0); } else { return registry[key].subject; } } /// @notice Checks if a claim signature is valid, and corresponds to the given subject /// @param subject Account the claim refers to /// @param attester Account that signed the claim /// @param sig The given signature that must match keccak256([`subject`, `claimhash`]) /// @return The subject of the claim, or address(0) if none was found function verifyClaim( address subject, address attester, bytes calldata sig ) override external view returns (bool) { return getClaim(attester, sig) == subject; } /// @notice Callable by an attester, to revoke previously signed claims about a subject /// @param sig The given signature that must match keccak256([`subject`, `claimhash`]) function revokeClaim( bytes calldata sig ) public { bytes32 key = computeKey(msg.sender, sig); require(registry[key].subject != address(0), "ClaimsRegistry: Claim not found"); registry[key].revoked = true; emit ClaimRevoked(sig); } /// @notice computes the hash that must be signed by the attester before storing a claim /// @param subject Account the claim refers to /// @param claimHash the claimHash that was signed along with the subject /// @return The hash to be signed by the attester function computeSignableKey(address subject, bytes32 claimHash) public pure returns (bytes32) { return keccak256(abi.encodePacked(subject, claimHash)); } function computeKey(address attester, bytes calldata sig) internal pure returns (bytes32) { return keccak256(abi.encodePacked(attester, sig)); } }
// SPDX-License-Identifier: MIT 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 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) { 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 ^0.8.3; /// @title A set of helper functions to verify signatures, to be used in the ClaimsRegistry /// @author Miguel Palhas <[email protected]> contract Verifier { /// @notice Verifies that the given signature matches the provided data, and /// was signed by the provided issuer. Assumes data was signed using the /// Ethereum prefix to protect against unkonwingly signing transactions /// @param hash The data to verify /// @param sig The signature of the data /// @param signer The expected signer of the data /// @return `true` if `signer` and `hash` match `sig` function verifyWithPrefix(bytes32 hash, bytes calldata sig, address signer) public pure returns (bool) { return verify(addPrefix(hash), sig, signer); } /// @notice Recovers the signer of the given signature and data. Assumes data /// was signed using the Ethereum prefix to protect against unknowingly signing /// transaction.s /// @param hash The data to verify /// @param sig The signature of the data /// @return The address recovered by checking the signature against the data function recoverWithPrefix(bytes32 hash, bytes calldata sig) public pure returns (address) { return recover(addPrefix(hash), sig); } function verify(bytes32 hash, bytes calldata sig, address signer) internal pure returns (bool) { return recover(hash, sig) == signer; } function recover(bytes32 hash, bytes calldata _sig) internal pure returns (address) { bytes memory sig = _sig; bytes32 r; bytes32 s; uint8 v; if (sig.length != 65) { return address(0); } assembly { r := mload(add(sig, 32)) s := mload(add(sig, 64)) v := and(mload(add(sig, 65)), 255) } if (v < 27) { v += 27; } if (v != 27 && v != 28) { return address(0); } return ecrecover(hash, v, r, s); } function addPrefix(bytes32 hash) private pure returns (bytes32) { bytes memory prefix = "\x19Ethereum Signed Message:\n32"; return keccak256(abi.encodePacked(prefix, hash)); } }
{ "optimizer": { "enabled": true, "runs": 1000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} }
Contract Security Audit
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ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_subscriber","type":"address"}],"name":"getCurrentReward","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_subscriber","type":"address"}],"name":"getMaxStakeReward","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_subscriber","type":"address"}],"name":"getStakedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockedReward","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"registry","outputs":[{"internalType":"contract IClaimsRegistryVerifier","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes","name":"claimSig","type":"bytes"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startDate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"subscriptions","outputs":[{"internalType":"bool","name":"active","type":"bool"},{"internalType":"address","name":"subscriberAddress","type":"address"},{"internalType":"uint256","name":"startDate","type":"uint256"},{"internalType":"uint256","name":"stakedAmount","type":"uint256"},{"internalType":"uint256","name":"maxReward","type":"uint256"},{"internalType":"uint256","name":"withdrawAmount","type":"uint256"},{"internalType":"uint256","name":"withdrawDate","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalPool","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawPool","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)
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
-----Decoded View---------------
Arg [0] : _token (address): 0xF4d861575ecC9493420A3f5a14F85B13f0b50EB3
Arg [1] : _registry (address): 0x1A5FA65E50d503a29Ec57cD102f2e7970a6963BB
Arg [2] : _attester (address): 0xa3015543Ce7da7B9708076C1171E242C36452F10
Arg [3] : _startDate (uint256): 1620822600
Arg [4] : _endDate (uint256): 1624451400
Arg [5] : _minAmount (uint256): 1000000000000000000
Arg [6] : _maxAmount (uint256): 20000000000000000000000
Arg [7] : _cap (uint256): 40
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000f4d861575ecc9493420a3f5a14f85b13f0b50eb3
Arg [1] : 0000000000000000000000001a5fa65e50d503a29ec57cd102f2e7970a6963bb
Arg [2] : 000000000000000000000000a3015543ce7da7b9708076c1171e242c36452f10
Arg [3] : 00000000000000000000000000000000000000000000000000000000609bca48
Arg [4] : 0000000000000000000000000000000000000000000000000000000060d32948
Arg [5] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [6] : 00000000000000000000000000000000000000000000043c33c1937564800000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000028
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Multichain Portfolio | 26 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | 100.00% | $0.009287 | 453,848.2207 | $4,215.11 |
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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.