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Overview
ETH Balance
0.0010719 ETH
Eth Value
$3.54 (@ $3,302.48/ETH)More Info
Private Name Tags
ContractCreator
Latest 13 from a total of 13 transactions
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Send Multi Sig | 17487689 | 556 days ago | IN | 0 ETH | 0.00159799 | ||||
Send Multi Sig | 17473438 | 558 days ago | IN | 0 ETH | 0.00147244 | ||||
Transfer | 17473427 | 558 days ago | IN | 0.005754 ETH | 0.00036766 | ||||
Send Multi Sig | 17473131 | 558 days ago | IN | 0 ETH | 0.00139843 | ||||
Transfer | 17473110 | 558 days ago | IN | 0.86160004 ETH | 0.00039342 | ||||
Send Multi Sig | 17392863 | 569 days ago | IN | 0 ETH | 0.00267531 | ||||
Transfer | 17387222 | 570 days ago | IN | 0.2707305 ETH | 0.00081548 | ||||
Send Multi Sig | 17385951 | 570 days ago | IN | 0 ETH | 0.00269877 | ||||
Send Multi Sig | 17381102 | 571 days ago | IN | 0 ETH | 0.00529533 | ||||
Send Multi Sig | 17097408 | 611 days ago | IN | 0 ETH | 0.00353166 | ||||
Send Multi Sig | 17089362 | 612 days ago | IN | 0 ETH | 0.0060264 | ||||
Send Multi Sig | 17089315 | 612 days ago | IN | 0 ETH | 0.00606957 | ||||
Send Multi Sig | 17087059 | 612 days ago | IN | 0 ETH | 0.00680743 |
Latest 17 internal transactions
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17487689 | 556 days ago | 0.280638 ETH | ||||
17473784 | 558 days ago | 0.0018614 ETH | ||||
17473438 | 558 days ago | 0.005754 ETH | ||||
17473131 | 558 days ago | 0.86160004 ETH | ||||
17392863 | 569 days ago | 0.266426 ETH | ||||
17385951 | 570 days ago | 0.271439 ETH | ||||
17381102 | 571 days ago | 0.189672 ETH | ||||
17112029 | 609 days ago | 0.459661 ETH | ||||
17112028 | 609 days ago | 0.276929 ETH | ||||
17097408 | 611 days ago | 0.3534 ETH | ||||
17097395 | 611 days ago | 0.35341 ETH | ||||
17089362 | 612 days ago | 0.149599 ETH | ||||
17089349 | 612 days ago | 0.149599 ETH | ||||
17089315 | 612 days ago | 0.000302 ETH | ||||
17087059 | 612 days ago | 0.124904 ETH | ||||
17084527 | 613 days ago | Contract Creation | 0 ETH | |||
17084521 | 613 days ago | 0.125261 ETH |
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Minimal Proxy Contract for 0xe8e847cf573fc8ed75621660a36affd18c543d7e
Contract Name:
WalletSimple
Compiler Version
v0.7.5+commit.eb77ed08
Contract Source Code (Solidity Multiple files format)
// SPDX-License-Identifier: Apache-2.0 pragma solidity 0.7.5; import './TransferHelper.sol'; import './Forwarder.sol'; import './ERC20Interface.sol'; /** * * WalletSimple * ============ * * Basic multi-signer wallet designed for use in a co-signing environment where 2 signatures are required to move funds. * Typically used in a 2-of-3 signing configuration. Uses ecrecover to allow for 2 signatures in a single transaction. * * The first signature is created on the operation hash (see Data Formats) and passed to sendMultiSig/sendMultiSigToken * The signer is determined by verifyMultiSig(). * * The second signature is created by the submitter of the transaction and determined by msg.signer. * * Data Formats * ============ * * The signature is created with ethereumjs-util.ecsign(operationHash). * Like the eth_sign RPC call, it packs the values as a 65-byte array of [r, s, v]. * Unlike eth_sign, the message is not prefixed. * * The operationHash the result of keccak256(prefix, toAddress, value, data, expireTime). * For ether transactions, `prefix` is "ETHER". * For token transaction, `prefix` is "ERC20" and `data` is the tokenContractAddress. * * */ contract WalletSimple { // Events event Deposited(address from, uint256 value, bytes data); event SafeModeActivated(address msgSender); event Transacted( address msgSender, // Address of the sender of the message initiating the transaction address otherSigner, // Address of the signer (second signature) used to initiate the transaction bytes32 operation, // Operation hash (see Data Formats) address toAddress, // The address the transaction was sent to uint256 value, // Amount of Wei sent to the address bytes data // Data sent when invoking the transaction ); event BatchTransfer(address sender, address recipient, uint256 value); // this event shows the other signer and the operation hash that they signed // specific batch transfer events are emitted in Batcher event BatchTransacted( address msgSender, // Address of the sender of the message initiating the transaction address otherSigner, // Address of the signer (second signature) used to initiate the transaction bytes32 operation // Operation hash (see Data Formats) ); // Public fields mapping(address => bool) public signers; // The addresses that can co-sign transactions on the wallet bool public safeMode = false; // When active, wallet may only send to signer addresses bool public initialized = false; // True if the contract has been initialized // Internal fields uint256 private constant MAX_SEQUENCE_ID_INCREASE = 10000; uint256 constant SEQUENCE_ID_WINDOW_SIZE = 10; uint256[SEQUENCE_ID_WINDOW_SIZE] recentSequenceIds; /** * Set up a simple multi-sig wallet by specifying the signers allowed to be used on this wallet. * 2 signers will be required to send a transaction from this wallet. * Note: The sender is NOT automatically added to the list of signers. * Signers CANNOT be changed once they are set * * @param allowedSigners An array of signers on the wallet */ function init(address[] calldata allowedSigners) external onlyUninitialized { require(allowedSigners.length == 3, 'Invalid number of signers'); for (uint8 i = 0; i < allowedSigners.length; i++) { require(allowedSigners[i] != address(0), 'Invalid signer'); signers[allowedSigners[i]] = true; } initialized = true; } /** * Get the network identifier that signers must sign over * This provides protection signatures being replayed on other chains * This must be a virtual function because chain-specific contracts will need * to override with their own network ids. It also can't be a field * to allow this contract to be used by proxy with delegatecall, which will * not pick up on state variables */ function getNetworkId() internal virtual pure returns (string memory) { return 'ETHER'; } /** * Get the network identifier that signers must sign over for token transfers * This provides protection signatures being replayed on other chains * This must be a virtual function because chain-specific contracts will need * to override with their own network ids. It also can't be a field * to allow this contract to be used by proxy with delegatecall, which will * not pick up on state variables */ function getTokenNetworkId() internal virtual pure returns (string memory) { return 'ERC20'; } /** * Get the network identifier that signers must sign over for batch transfers * This provides protection signatures being replayed on other chains * This must be a virtual function because chain-specific contracts will need * to override with their own network ids. It also can't be a field * to allow this contract to be used by proxy with delegatecall, which will * not pick up on state variables */ function getBatchNetworkId() internal virtual pure returns (string memory) { return 'ETHER-Batch'; } /** * Determine if an address is a signer on this wallet * @param signer address to check * returns boolean indicating whether address is signer or not */ function isSigner(address signer) public view returns (bool) { return signers[signer]; } /** * Modifier that will execute internal code block only if the sender is an authorized signer on this wallet */ modifier onlySigner { require(isSigner(msg.sender), 'Non-signer in onlySigner method'); _; } /** * Modifier that will execute internal code block only if the contract has not been initialized yet */ modifier onlyUninitialized { require(!initialized, 'Contract already initialized'); _; } /** * Gets called when a transaction is received with data that does not match any other method */ fallback() external payable { if (msg.value > 0) { // Fire deposited event if we are receiving funds Deposited(msg.sender, msg.value, msg.data); } } /** * Gets called when a transaction is received with ether and no data */ receive() external payable { if (msg.value > 0) { // Fire deposited event if we are receiving funds Deposited(msg.sender, msg.value, msg.data); } } /** * Execute a multi-signature transaction from this wallet using 2 signers: one from msg.sender and the other from ecrecover. * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated. * * @param toAddress the destination address to send an outgoing transaction * @param value the amount in Wei to be sent * @param data the data to send to the toAddress when invoking the transaction * @param expireTime the number of seconds since 1970 for which this transaction is valid * @param sequenceId the unique sequence id obtainable from getNextSequenceId * @param signature see Data Formats */ function sendMultiSig( address toAddress, uint256 value, bytes calldata data, uint256 expireTime, uint256 sequenceId, bytes calldata signature ) external onlySigner { // Verify the other signer bytes32 operationHash = keccak256( abi.encodePacked( getNetworkId(), toAddress, value, data, expireTime, sequenceId ) ); address otherSigner = verifyMultiSig( toAddress, operationHash, signature, expireTime, sequenceId ); // Success, send the transaction (bool success, ) = toAddress.call{ value: value }(data); require(success, 'Call execution failed'); emit Transacted( msg.sender, otherSigner, operationHash, toAddress, value, data ); } /** * Execute a batched multi-signature transaction from this wallet using 2 signers: one from msg.sender and the other from ecrecover. * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated. * The recipients and values to send are encoded in two arrays, where for index i, recipients[i] will be sent values[i]. * * @param recipients The list of recipients to send to * @param values The list of values to send to * @param expireTime the number of seconds since 1970 for which this transaction is valid * @param sequenceId the unique sequence id obtainable from getNextSequenceId * @param signature see Data Formats */ function sendMultiSigBatch( address[] calldata recipients, uint256[] calldata values, uint256 expireTime, uint256 sequenceId, bytes calldata signature ) external onlySigner { require(recipients.length != 0, 'Not enough recipients'); require( recipients.length == values.length, 'Unequal recipients and values' ); require(recipients.length < 256, 'Too many recipients, max 255'); // Verify the other signer bytes32 operationHash = keccak256( abi.encodePacked( getBatchNetworkId(), recipients, values, expireTime, sequenceId ) ); // the first parameter (toAddress) is used to ensure transactions in safe mode only go to a signer // if in safe mode, we should use normal sendMultiSig to recover, so this check will always fail if in safe mode require(!safeMode, 'Batch in safe mode'); address otherSigner = verifyMultiSig( address(0x0), operationHash, signature, expireTime, sequenceId ); batchTransfer(recipients, values); emit BatchTransacted(msg.sender, otherSigner, operationHash); } /** * Transfer funds in a batch to each of recipients * @param recipients The list of recipients to send to * @param values The list of values to send to recipients. * The recipient with index i in recipients array will be sent values[i]. * Thus, recipients and values must be the same length */ function batchTransfer( address[] calldata recipients, uint256[] calldata values ) internal { for (uint256 i = 0; i < recipients.length; i++) { require(address(this).balance >= values[i], 'Insufficient funds'); (bool success, ) = recipients[i].call{ value: values[i] }(''); require(success, 'Call failed'); emit BatchTransfer(msg.sender, recipients[i], values[i]); } } /** * Execute a multi-signature token transfer from this wallet using 2 signers: one from msg.sender and the other from ecrecover. * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated. * * @param toAddress the destination address to send an outgoing transaction * @param value the amount in tokens to be sent * @param tokenContractAddress the address of the erc20 token contract * @param expireTime the number of seconds since 1970 for which this transaction is valid * @param sequenceId the unique sequence id obtainable from getNextSequenceId * @param signature see Data Formats */ function sendMultiSigToken( address toAddress, uint256 value, address tokenContractAddress, uint256 expireTime, uint256 sequenceId, bytes calldata signature ) external onlySigner { // Verify the other signer bytes32 operationHash = keccak256( abi.encodePacked( getTokenNetworkId(), toAddress, value, tokenContractAddress, expireTime, sequenceId ) ); verifyMultiSig(toAddress, operationHash, signature, expireTime, sequenceId); TransferHelper.safeTransfer(tokenContractAddress, toAddress, value); } /** * Execute a token flush from one of the forwarder addresses. This transfer needs only a single signature and can be done by any signer * * @param forwarderAddress the address of the forwarder address to flush the tokens from * @param tokenContractAddress the address of the erc20 token contract */ function flushForwarderTokens( address payable forwarderAddress, address tokenContractAddress ) external onlySigner { Forwarder forwarder = Forwarder(forwarderAddress); forwarder.flushTokens(tokenContractAddress); } /** * Do common multisig verification for both eth sends and erc20token transfers * * @param toAddress the destination address to send an outgoing transaction * @param operationHash see Data Formats * @param signature see Data Formats * @param expireTime the number of seconds since 1970 for which this transaction is valid * @param sequenceId the unique sequence id obtainable from getNextSequenceId * returns address that has created the signature */ function verifyMultiSig( address toAddress, bytes32 operationHash, bytes calldata signature, uint256 expireTime, uint256 sequenceId ) private returns (address) { address otherSigner = recoverAddressFromSignature(operationHash, signature); // Verify if we are in safe mode. In safe mode, the wallet can only send to signers require(!safeMode || isSigner(toAddress), 'External transfer in safe mode'); // Verify that the transaction has not expired require(expireTime >= block.timestamp, 'Transaction expired'); // Try to insert the sequence ID. Will revert if the sequence id was invalid tryInsertSequenceId(sequenceId); require(isSigner(otherSigner), 'Invalid signer'); require(otherSigner != msg.sender, 'Signers cannot be equal'); return otherSigner; } /** * Irrevocably puts contract into safe mode. When in this mode, transactions may only be sent to signing addresses. */ function activateSafeMode() external onlySigner { safeMode = true; SafeModeActivated(msg.sender); } /** * Gets signer's address using ecrecover * @param operationHash see Data Formats * @param signature see Data Formats * returns address recovered from the signature */ function recoverAddressFromSignature( bytes32 operationHash, bytes memory signature ) private pure returns (address) { require(signature.length == 65, 'Invalid signature - wrong length'); // We need to unpack the signature, which is given as an array of 65 bytes (like eth.sign) bytes32 r; bytes32 s; uint8 v; // solhint-disable-next-line assembly { r := mload(add(signature, 32)) s := mload(add(signature, 64)) v := and(mload(add(signature, 65)), 255) } if (v < 27) { v += 27; // Ethereum versions are 27 or 28 as opposed to 0 or 1 which is submitted by some signing libs } // protect against signature malleability // S value must be in the lower half orader // reference: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/051d340171a93a3d401aaaea46b4b62fa81e5d7c/contracts/cryptography/ECDSA.sol#L53 require( uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value" ); // note that this returns 0 if the signature is invalid // Since 0x0 can never be a signer, when the recovered signer address // is checked against our signer list, that 0x0 will cause an invalid signer failure return ecrecover(operationHash, v, r, s); } /** * Verify that the sequence id has not been used before and inserts it. Throws if the sequence ID was not accepted. * We collect a window of up to 10 recent sequence ids, and allow any sequence id that is not in the window and * greater than the minimum element in the window. * @param sequenceId to insert into array of stored ids */ function tryInsertSequenceId(uint256 sequenceId) private onlySigner { // Keep a pointer to the lowest value element in the window uint256 lowestValueIndex = 0; // fetch recentSequenceIds into memory for function context to avoid unnecessary sloads uint256[SEQUENCE_ID_WINDOW_SIZE] memory _recentSequenceIds = recentSequenceIds; for (uint256 i = 0; i < SEQUENCE_ID_WINDOW_SIZE; i++) { require(_recentSequenceIds[i] != sequenceId, 'Sequence ID already used'); if (_recentSequenceIds[i] < _recentSequenceIds[lowestValueIndex]) { lowestValueIndex = i; } } // The sequence ID being used is lower than the lowest value in the window // so we cannot accept it as it may have been used before require( sequenceId > _recentSequenceIds[lowestValueIndex], 'Sequence ID below window' ); // Block sequence IDs which are much higher than the lowest value // This prevents people blocking the contract by using very large sequence IDs quickly require( sequenceId <= (_recentSequenceIds[lowestValueIndex] + MAX_SEQUENCE_ID_INCREASE), 'Sequence ID above maximum' ); recentSequenceIds[lowestValueIndex] = sequenceId; } /** * Gets the next available sequence ID for signing when using executeAndConfirm * returns the sequenceId one higher than the highest currently stored */ function getNextSequenceId() public view returns (uint256) { uint256 highestSequenceId = 0; for (uint256 i = 0; i < SEQUENCE_ID_WINDOW_SIZE; i++) { if (recentSequenceIds[i] > highestSequenceId) { highestSequenceId = recentSequenceIds[i]; } } return highestSequenceId + 1; } }
File 2 of 4: ERC20Interface.sol
// SPDX-License-Identifier: UNLICENSED pragma solidity 0.7.5; /** * Contract that exposes the needed erc20 token functions */ abstract contract ERC20Interface { // Send _value amount of tokens to address _to function transfer(address _to, uint256 _value) public virtual returns (bool success); // Get the account balance of another account with address _owner function balanceOf(address _owner) public virtual view returns (uint256 balance); }
File 3 of 4: Forwarder.sol
// SPDX-License-Identifier: Apache-2.0 pragma solidity 0.7.5; import './TransferHelper.sol'; import './ERC20Interface.sol'; /** * Contract that will forward any incoming Ether to the creator of the contract * */ contract Forwarder { // Address to which any funds sent to this contract will be forwarded address public parentAddress; event ForwarderDeposited(address from, uint256 value, bytes data); /** * Initialize the contract, and sets the destination address to that of the creator */ function init(address _parentAddress) external onlyUninitialized { parentAddress = _parentAddress; uint256 value = address(this).balance; if (value == 0) { return; } (bool success, ) = parentAddress.call{ value: value }(''); require(success, 'Flush failed'); // NOTE: since we are forwarding on initialization, // we don't have the context of the original sender. // We still emit an event about the forwarding but set // the sender to the forwarder itself emit ForwarderDeposited(address(this), value, msg.data); } /** * Modifier that will execute internal code block only if the sender is the parent address */ modifier onlyParent { require(msg.sender == parentAddress, 'Only Parent'); _; } /** * Modifier that will execute internal code block only if the contract has not been initialized yet */ modifier onlyUninitialized { require(parentAddress == address(0x0), 'Already initialized'); _; } /** * Default function; Gets called when data is sent but does not match any other function */ fallback() external payable { flush(); } /** * Default function; Gets called when Ether is deposited with no data, and forwards it to the parent address */ receive() external payable { flush(); } /** * Execute a token transfer of the full balance from the forwarder token to the parent address * @param tokenContractAddress the address of the erc20 token contract */ function flushTokens(address tokenContractAddress) external onlyParent { ERC20Interface instance = ERC20Interface(tokenContractAddress); address forwarderAddress = address(this); uint256 forwarderBalance = instance.balanceOf(forwarderAddress); if (forwarderBalance == 0) { return; } TransferHelper.safeTransfer( tokenContractAddress, parentAddress, forwarderBalance ); } /** * Flush the entire balance of the contract to the parent address. */ function flush() public { uint256 value = address(this).balance; if (value == 0) { return; } (bool success, ) = parentAddress.call{ value: value }(''); require(success, 'Flush failed'); emit ForwarderDeposited(msg.sender, value, msg.data); } }
File 4 of 4: TransferHelper.sol
// SPDX-License-Identifier: Apache-2.0 pragma solidity >=0.7.5; // helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false library TransferHelper { function safeApprove( address token, address to, uint256 value ) internal { // bytes4(keccak256(bytes('approve(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper::safeApprove: approve failed' ); } function safeTransfer( address token, address to, uint256 value ) internal { // bytes4(keccak256(bytes('transfer(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper::safeTransfer: transfer failed' ); } function safeTransferFrom( address token, address from, address to, uint256 value ) internal { // bytes4(keccak256(bytes('transferFrom(address,address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper::transferFrom: transferFrom failed' ); } function safeTransferETH(address to, uint256 value) internal { (bool success, ) = to.call{value: value}(new bytes(0)); require(success, 'TransferHelper::safeTransferETH: ETH transfer failed'); } }
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | Ether (ETH) | 100.00% | $3,303.18 | 0.0010719 | $3.54 |
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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.