Overview
ETH Balance
0 ETH
Eth Value
$0.00Token Holdings
Latest 25 from a total of 20,138 transactions
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Send Eth | 20716973 | 10 hrs ago | IN | 0.11 ETH | 0.00019515 | ||||
Withdraw Token O... | 20713860 | 21 hrs ago | IN | 0 ETH | 0.00081231 | ||||
Send Token | 20713836 | 21 hrs ago | IN | 0 ETH | 0.00073952 | ||||
Send Eth | 20711771 | 28 hrs ago | IN | 0.51 ETH | 0.00018783 | ||||
Send Eth | 20711414 | 29 hrs ago | IN | 0.47 ETH | 0.00009896 | ||||
Send Eth | 20710848 | 31 hrs ago | IN | 0.517 ETH | 0.0001124 | ||||
Send Eth | 20710203 | 33 hrs ago | IN | 0.01 ETH | 0.000111 | ||||
Send Eth | 20710191 | 33 hrs ago | IN | 0.01 ETH | 0.00011394 | ||||
Send Eth | 20710183 | 33 hrs ago | IN | 0.01 ETH | 0.00011467 | ||||
Send Eth | 20710172 | 33 hrs ago | IN | 0.01 ETH | 0.00010598 | ||||
Withdraw Token O... | 20707053 | 44 hrs ago | IN | 0 ETH | 0.00021774 | ||||
Send Token | 20707027 | 44 hrs ago | IN | 0 ETH | 0.00020231 | ||||
Send Eth | 20706680 | 45 hrs ago | IN | 0.432 ETH | 0.00024553 | ||||
Send Eth | 20704431 | 2 days ago | IN | 0.45 ETH | 0.0001287 | ||||
Send Eth | 20704232 | 2 days ago | IN | 0.52 ETH | 0.00009985 | ||||
Send Eth | 20704122 | 2 days ago | IN | 0.102 ETH | 0.00010731 | ||||
Send Eth | 20702744 | 2 days ago | IN | 0.0052 ETH | 0.0000812 | ||||
Send Eth | 20698801 | 2 days ago | IN | 0.01 ETH | 0.00018081 | ||||
Send Eth | 20698776 | 2 days ago | IN | 0.01 ETH | 0.0001715 | ||||
Send Eth | 20698775 | 2 days ago | IN | 0.46 ETH | 0.0001582 | ||||
Send Eth | 20698764 | 2 days ago | IN | 0.01 ETH | 0.00018182 | ||||
Send Eth | 20698726 | 2 days ago | IN | 0.01 ETH | 0.00017655 | ||||
Withdraw Token O... | 20692390 | 3 days ago | IN | 0 ETH | 0.00118571 | ||||
Send Token | 20692376 | 3 days ago | IN | 0 ETH | 0.00111831 | ||||
Send Eth | 20689576 | 4 days ago | IN | 0.452 ETH | 0.00018709 |
Latest 25 internal transactions (View All)
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Parent Transaction Hash | Block | From | To | |||
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20716973 | 10 hrs ago | 0.11 ETH | ||||
20711771 | 28 hrs ago | 0.51 ETH | ||||
20711414 | 29 hrs ago | 0.47 ETH | ||||
20710848 | 31 hrs ago | 0.517 ETH | ||||
20710203 | 33 hrs ago | 0.01 ETH | ||||
20710191 | 33 hrs ago | 0.01 ETH | ||||
20710183 | 33 hrs ago | 0.01 ETH | ||||
20710172 | 33 hrs ago | 0.01 ETH | ||||
20709712 | 35 hrs ago | 0.00516003 ETH | ||||
20709712 | 35 hrs ago | 0.00516003 ETH | ||||
20709712 | 35 hrs ago | 0.00516232 ETH | ||||
20709712 | 35 hrs ago | 0.00516232 ETH | ||||
20709712 | 35 hrs ago | 0.00517 ETH | ||||
20709712 | 35 hrs ago | 0.00517 ETH | ||||
20709678 | 35 hrs ago | 0.00512344 ETH | ||||
20709678 | 35 hrs ago | 0.00512344 ETH | ||||
20709678 | 35 hrs ago | 0.00512323 ETH | ||||
20709678 | 35 hrs ago | 0.00512323 ETH | ||||
20709678 | 35 hrs ago | 0.00512322 ETH | ||||
20709678 | 35 hrs ago | 0.00512322 ETH | ||||
20709678 | 35 hrs ago | 0.00514232 ETH | ||||
20709678 | 35 hrs ago | 0.00514232 ETH | ||||
20709678 | 35 hrs ago | 0.00514234 ETH | ||||
20709678 | 35 hrs ago | 0.00514234 ETH | ||||
20709678 | 35 hrs ago | 0.00510023 ETH |
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Contract Name:
Umbra
Compiler Version
v0.7.6+commit.7338295f
Optimization Enabled:
Yes with 999999 runs
Other Settings:
default evmVersion, Audited
Contract Source Code (Solidity Standard Json-Input format)Audit Report
// SPDX-License-Identifier: MIT pragma solidity ^0.7.6; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; import "./IUmbraHookReceiver.sol"; contract Umbra is Ownable { // =========================================== Events ============================================ /// @notice Emitted when a payment is sent event Announcement( address indexed receiver, // stealth address uint256 amount, // funds address indexed token, // token address or ETH placeholder bytes32 pkx, // ephemeral public key x coordinate bytes32 ciphertext // encrypted entropy and payload extension ); /// @notice Emitted when a token is withdrawn event TokenWithdrawal( address indexed receiver, // stealth address address indexed acceptor, // destination of funds uint256 amount, // funds address indexed token // token address ); // ======================================= State variables ======================================= /// @dev Placeholder address used to identify transfer of native ETH address internal constant ETH_TOKEN_PLACHOLDER = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; /// @notice An ETH amount that must be sent alongside each payment; used as an anti-spam measure uint256 public toll; /// @notice A privileged address, set by the admin, that can sweep all collected ETH tolls address public tollCollector; /// @notice The address where ETH funds are sent when collected by the tollCollector address payable public tollReceiver; /// @notice Token payments pending withdrawal; stealth address => token address => amount mapping(address => mapping(address => uint256)) public tokenPayments; // ======================================= Setup & Admin ======================================== /** * @param _toll Amount of ETH required per send * @param _tollCollector Address that can sweep collected funds * @param _tollReceiver Address that receives collected funds */ constructor( uint256 _toll, address _tollCollector, address payable _tollReceiver ) { toll = _toll; tollCollector = _tollCollector; tollReceiver = _tollReceiver; } /** * @notice Admin only function to update the toll * @param _newToll New ETH toll in wei */ function setToll(uint256 _newToll) external onlyOwner { toll = _newToll; } /** * @notice Admin only function to update the toll collector * @param _newTollCollector New address which has fund sweeping privileges */ function setTollCollector(address _newTollCollector) external onlyOwner { tollCollector = _newTollCollector; } /** * @notice Admin only function to update the toll receiver * @param _newTollReceiver New address which receives collected funds */ function setTollReceiver(address payable _newTollReceiver) external onlyOwner { tollReceiver = _newTollReceiver; } /** * @notice Function only the toll collector can call to sweep funds to the toll receiver */ function collectTolls() external { require(msg.sender == tollCollector, "Umbra: Not toll collector"); tollReceiver.transfer(address(this).balance); } // ======================================= Send ================================================= /** * @notice Send and announce ETH payment to a stealth address * @param _receiver Stealth address receiving the payment * @param _tollCommitment Exact toll the sender is paying; should equal contract toll; * the committment is used to prevent frontrunning attacks by the owner; * see https://github.com/ScopeLift/umbra-protocol/issues/54 for more information * @param _pkx X-coordinate of the ephemeral public key used to encrypt the payload * @param _ciphertext Encrypted entropy (used to generated the stealth address) and payload extension */ function sendEth( address payable _receiver, uint256 _tollCommitment, bytes32 _pkx, // ephemeral public key x coordinate bytes32 _ciphertext ) external payable { require(_tollCommitment == toll, "Umbra: Invalid or outdated toll commitment"); // also protects from underflow require(msg.value > toll, "Umbra: Must pay more than the toll"); uint256 amount = msg.value - toll; emit Announcement(_receiver, amount, ETH_TOKEN_PLACHOLDER, _pkx, _ciphertext); _receiver.transfer(amount); } /** * @notice Send and announce an ERC20 payment to a stealth address * @param _receiver Stealth address receiving the payment * @param _tokenAddr Address of the ERC20 token being sent * @param _amount Amount of the token to send, in its own base units * @param _pkx X-coordinate of the ephemeral public key used to encrypt the payload * @param _ciphertext Encrypted entropy (used to generated the stealth address) and payload extension */ function sendToken( address _receiver, address _tokenAddr, uint256 _amount, bytes32 _pkx, // ephemeral public key x coordinate bytes32 _ciphertext ) external payable { require(msg.value == toll, "Umbra: Must pay the exact toll"); require(tokenPayments[_receiver][_tokenAddr] == 0, "Umbra: Cannot send more tokens to stealth address"); tokenPayments[_receiver][_tokenAddr] = _amount; emit Announcement(_receiver, _amount, _tokenAddr, _pkx, _ciphertext); SafeERC20.safeTransferFrom(IERC20(_tokenAddr), msg.sender, address(this), _amount); } // ======================================= Withdraw ============================================= /** * @notice Withdraw an ERC20 token payment sent to a stealth address * @dev This method must be directly called by the stealth address * @param _acceptor Address where withdrawn funds should be sent * @param _tokenAddr Address of the ERC20 token being withdrawn */ function withdrawToken(address _acceptor, address _tokenAddr) external { _withdrawTokenInternal(msg.sender, _acceptor, _tokenAddr, address(0), 0, IUmbraHookReceiver(0), ""); } /** * @notice Withdraw an ERC20 token payment sent to a stealth address * @dev This method must be directly called by the stealth address * @param _acceptor Address where withdrawn funds should be sent * @param _tokenAddr Address of the ERC20 token being withdrawn * @param _hook Contract that will be called after the token withdrawal has completed * @param _data Arbitrary data that will be passed to the post-withdraw hook contract */ function withdrawTokenAndCall( address _acceptor, address _tokenAddr, IUmbraHookReceiver _hook, bytes memory _data ) external { _withdrawTokenInternal(msg.sender, _acceptor, _tokenAddr, address(0), 0, _hook, _data); } /** * @notice Withdraw an ERC20 token payment on behalf of a stealth address via signed authorization * @param _stealthAddr The stealth address whose token balance will be withdrawn * @param _acceptor Address where withdrawn funds should be sent * @param _tokenAddr Address of the ERC20 token being withdrawn * @param _sponsor Address which is compensated for submitting the withdrawal tx * @param _sponsorFee Amount of the token to pay to the sponsor * @param _v ECDSA signature component: Parity of the `y` coordinate of point `R` * @param _r ECDSA signature component: x-coordinate of `R` * @param _s ECDSA signature component: `s` value of the signature */ function withdrawTokenOnBehalf( address _stealthAddr, address _acceptor, address _tokenAddr, address _sponsor, uint256 _sponsorFee, uint8 _v, bytes32 _r, bytes32 _s ) external { _validateWithdrawSignature( _stealthAddr, _acceptor, _tokenAddr, _sponsor, _sponsorFee, IUmbraHookReceiver(0), "", _v, _r, _s ); _withdrawTokenInternal(_stealthAddr, _acceptor, _tokenAddr, _sponsor, _sponsorFee, IUmbraHookReceiver(0), ""); } /** * @notice Withdraw an ERC20 token payment on behalf of a stealth address via signed authorization * @param _stealthAddr The stealth address whose token balance will be withdrawn * @param _acceptor Address where withdrawn funds should be sent * @param _tokenAddr Address of the ERC20 token being withdrawn * @param _sponsor Address which is compensated for submitting the withdrawal tx * @param _sponsorFee Amount of the token to pay to the sponsor * @param _hook Contract that will be called after the token withdrawal has completed * @param _data Arbitrary data that will be passed to the post-withdraw hook contract * @param _v ECDSA signature component: Parity of the `y` coordinate of point `R` * @param _r ECDSA signature component: x-coordinate of `R` * @param _s ECDSA signature component: `s` value of the signature */ function withdrawTokenAndCallOnBehalf( address _stealthAddr, address _acceptor, address _tokenAddr, address _sponsor, uint256 _sponsorFee, IUmbraHookReceiver _hook, bytes memory _data, uint8 _v, bytes32 _r, bytes32 _s ) external { _validateWithdrawSignature(_stealthAddr, _acceptor, _tokenAddr, _sponsor, _sponsorFee, _hook, _data, _v, _r, _s); _withdrawTokenInternal(_stealthAddr, _acceptor, _tokenAddr, _sponsor, _sponsorFee, _hook, _data); } /** * @notice Low level withdrawal function that should only be called after safety checks * @param _stealthAddr The stealth address whose token balance will be withdrawn * @param _acceptor Address where withdrawn funds should be sent * @param _tokenAddr Address of the ERC20 token being withdrawn * @param _sponsor Address which is compensated for submitting the withdrawal tx * @param _sponsorFee Amount of the token to pay to the sponsor * @param _hook Contract that will be called after the token withdrawal has completed * @param _data Arbitrary data that will be passed to the post-withdraw hook contract */ function _withdrawTokenInternal( address _stealthAddr, address _acceptor, address _tokenAddr, address _sponsor, uint256 _sponsorFee, IUmbraHookReceiver _hook, bytes memory _data ) internal { uint256 _amount = tokenPayments[_stealthAddr][_tokenAddr]; // also protects from underflow require(_amount > _sponsorFee, "Umbra: No balance to withdraw or fee exceeds balance"); uint256 _withdrawalAmount = _amount - _sponsorFee; delete tokenPayments[_stealthAddr][_tokenAddr]; emit TokenWithdrawal(_stealthAddr, _acceptor, _withdrawalAmount, _tokenAddr); SafeERC20.safeTransfer(IERC20(_tokenAddr), _acceptor, _withdrawalAmount); if (_sponsorFee > 0) { SafeERC20.safeTransfer(IERC20(_tokenAddr), _sponsor, _sponsorFee); } if (address(_hook) != address(0)) { _hook.tokensWithdrawn(_withdrawalAmount, _stealthAddr, _acceptor, _tokenAddr, _sponsor, _sponsorFee, _data); } } /** * @notice Internal method which recovers address from signature of the parameters and throws if not _stealthAddr * @param _stealthAddr The stealth address whose token balance will be withdrawn * @param _acceptor Address where withdrawn funds should be sent * @param _tokenAddr Address of the ERC20 token being withdrawn * @param _sponsor Address which is compensated for submitting the withdrawal tx * @param _sponsorFee Amount of the token to pay to the sponsor * @param _hook Contract that will be called after the token withdrawal has completed * @param _data Arbitrary data that will be passed to the post-withdraw hook contract * @param _v ECDSA signature component: Parity of the `y` coordinate of point `R` * @param _r ECDSA signature component: x-coordinate of `R` * @param _s ECDSA signature component: `s` value of the signature */ function _validateWithdrawSignature( address _stealthAddr, address _acceptor, address _tokenAddr, address _sponsor, uint256 _sponsorFee, IUmbraHookReceiver _hook, bytes memory _data, uint8 _v, bytes32 _r, bytes32 _s ) internal view { uint256 _chainId; assembly { _chainId := chainid() } bytes32 _digest = keccak256( abi.encodePacked( "\x19Ethereum Signed Message:\n32", keccak256( abi.encode(_chainId, address(this), _acceptor, _tokenAddr, _sponsor, _sponsorFee, address(_hook), _data) ) ) ); address _recoveredAddress = ecrecover(_digest, _v, _r, _s); require(_recoveredAddress != address(0) && _recoveredAddress == _stealthAddr, "Umbra: Invalid Signature"); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 () internal { 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 >=0.6.0 <0.8.0; 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 ^0.7.6; /// @dev Interface that post-withdraw hooks must implement to interop with Umbra interface IUmbraHookReceiver { /** * @notice Method called after a user completes an Umbra token withdrawal * @param _amount The amount of the token withdrawn _after_ subtracting the sponsor fee * @param _stealthAddr The stealth address whose token balance was withdrawn * @param _acceptor Address where withdrawn funds were sent; can be this contract * @param _tokenAddr Address of the ERC20 token that was withdrawn * @param _sponsor Address which was compensated for submitting the withdrawal tx * @param _sponsorFee Amount of the token that was paid to the sponsor * @param _data Arbitrary data passed to this hook by the withdrawer */ function tokensWithdrawn( uint256 _amount, address _stealthAddr, address _acceptor, address _tokenAddr, address _sponsor, uint256 _sponsorFee, bytes memory _data ) external; }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 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 >=0.6.0 <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 >=0.6.0 <0.8.0; /** * @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, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @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) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @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) { 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, reverting 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) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting 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) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * 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); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * 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); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * 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 >=0.6.2 <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; // solhint-disable-next-line no-inline-assembly 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"); // 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"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
{ "optimizer": { "enabled": true, "runs": 999999 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} }
Contract Security Audit
- ConsenSys Diligence - March 26th, 2021 - Security Audit Report
[{"inputs":[{"internalType":"uint256","name":"_toll","type":"uint256"},{"internalType":"address","name":"_tollCollector","type":"address"},{"internalType":"address payable","name":"_tollReceiver","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"bytes32","name":"pkx","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"ciphertext","type":"bytes32"}],"name":"Announcement","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"receiver","type":"address"},{"indexed":true,"internalType":"address","name":"acceptor","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"address","name":"token","type":"address"}],"name":"TokenWithdrawal","type":"event"},{"inputs":[],"name":"collectTolls","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_receiver","type":"address"},{"internalType":"uint256","name":"_tollCommitment","type":"uint256"},{"internalType":"bytes32","name":"_pkx","type":"bytes32"},{"internalType":"bytes32","name":"_ciphertext","type":"bytes32"}],"name":"sendEth","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_tokenAddr","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes32","name":"_pkx","type":"bytes32"},{"internalType":"bytes32","name":"_ciphertext","type":"bytes32"}],"name":"sendToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newToll","type":"uint256"}],"name":"setToll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newTollCollector","type":"address"}],"name":"setTollCollector","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_newTollReceiver","type":"address"}],"name":"setTollReceiver","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"tokenPayments","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"toll","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tollCollector","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tollReceiver","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_acceptor","type":"address"},{"internalType":"address","name":"_tokenAddr","type":"address"}],"name":"withdrawToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_acceptor","type":"address"},{"internalType":"address","name":"_tokenAddr","type":"address"},{"internalType":"contract IUmbraHookReceiver","name":"_hook","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"withdrawTokenAndCall","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_stealthAddr","type":"address"},{"internalType":"address","name":"_acceptor","type":"address"},{"internalType":"address","name":"_tokenAddr","type":"address"},{"internalType":"address","name":"_sponsor","type":"address"},{"internalType":"uint256","name":"_sponsorFee","type":"uint256"},{"internalType":"contract IUmbraHookReceiver","name":"_hook","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"},{"internalType":"uint8","name":"_v","type":"uint8"},{"internalType":"bytes32","name":"_r","type":"bytes32"},{"internalType":"bytes32","name":"_s","type":"bytes32"}],"name":"withdrawTokenAndCallOnBehalf","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_stealthAddr","type":"address"},{"internalType":"address","name":"_acceptor","type":"address"},{"internalType":"address","name":"_tokenAddr","type":"address"},{"internalType":"address","name":"_sponsor","type":"address"},{"internalType":"uint256","name":"_sponsorFee","type":"uint256"},{"internalType":"uint8","name":"_v","type":"uint8"},{"internalType":"bytes32","name":"_r","type":"bytes32"},{"internalType":"bytes32","name":"_s","type":"bytes32"}],"name":"withdrawTokenOnBehalf","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)
000000000000000000000000000000000000000000000000000000000000000000000000000000000000000012ae679061c58e9f7660a2f7e6f06573014d2615000000000000000000000000b4435399ab53d6136c9aeebb77a0120620b117f9
-----Decoded View---------------
Arg [0] : _toll (uint256): 0
Arg [1] : _tollCollector (address): 0x12aE679061C58e9f7660A2f7e6f06573014d2615
Arg [2] : _tollReceiver (address): 0xb4435399AB53D6136C9AEEBb77a0120620b117F9
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 00000000000000000000000012ae679061c58e9f7660a2f7e6f06573014d2615
Arg [2] : 000000000000000000000000b4435399ab53d6136c9aeebb77a0120620b117f9
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Multichain Portfolio | 26 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
POL | 14.39% | $1 | 6,518.5487 | $6,518.55 | |
POL | 14.05% | $2,352.25 | 2.7046 | $6,361.82 | |
POL | 4.11% | $0.384927 | 4,841.7 | $1,863.7 | |
POL | 1.32% | $1 | 597.7801 | $598.38 | |
POL | 0.98% | $1 | 444.574 | $445.02 | |
POL | 0.45% | $1 | 206 | $206 | |
ARB | 14.76% | $2,353.99 | 2.8391 | $6,683.11 | |
ARB | 9.52% | $1 | 4,305.705 | $4,310.01 | |
ARB | 2.91% | $1 | 1,317.8597 | $1,319.18 | |
ARB | 0.71% | $0.527385 | 610 | $321.7 | |
ARB | 0.38% | $1 | 173.63 | $173.8 | |
ARB | 0.23% | $1 | 104.8755 | $104.98 | |
ETH | 12.58% | $1 | 5,698.5773 | $5,698.58 | |
ETH | 9.46% | $1 | 4,285.5202 | $4,285.52 | |
ETH | 1.10% | $1 | 500 | $500 | |
OP | 11.00% | $2,353.84 | 2.1161 | $4,980.84 | |
OP | 0.79% | $1 | 359 | $359 | |
OP | 0.66% | $1 | 301 | $301 | |
OP | 0.22% | $1 | 99.0001 | $99 | |
OP | 0.02% | $1 | 10.35 | $10.35 | |
OP | <0.01% | $57,213 | 0.00003 | $1.72 | |
BASE | 0.22% | $2,354.44 | 0.0418 | $98.46 | |
BASE | 0.03% | $1 | 15 | $15 | |
BASE | <0.01% | $0.999937 | 4 | $4 | |
GNO | 0.03% | $1 | 14 | $14 | |
GNO | 0.02% | $1 | 9.4 | $9.4 | |
GNO | 0.02% | $57,205 | 0.00014 | $8.01 |
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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.