ETH Price: $3,318.93 (-1.82%)
Gas: 5.56 Gwei

Contract

0x612c8118B654BA47309Ca604c77F3cf10452Cd0e
 

Overview

ETH Balance

0.0006458 ETH

Eth Value

$2.14 (@ $3,318.93/ETH)

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Send Multi Sig174959912023-06-17 0:34:47555 days ago1686962087IN
0x612c8118...10452Cd0e
0 ETH0.0011716514.9862106
Transfer174959842023-06-17 0:33:23555 days ago1686962003IN
0x612c8118...10452Cd0e
0.65747504 ETH0.0004098615.9233142
Send Multi Sig174946792023-06-16 20:09:35555 days ago1686946175IN
0x612c8118...10452Cd0e
0 ETH0.0015137719.36216739
Send Multi Sig174945172023-06-16 19:36:59555 days ago1686944219IN
0x612c8118...10452Cd0e
0 ETH0.0013233416.92643281
Send Multi Sig174883972023-06-15 22:59:23556 days ago1686869963IN
0x612c8118...10452Cd0e
0 ETH0.001242515.89247747
Send Multi Sig174882552023-06-15 22:30:47556 days ago1686868247IN
0x612c8118...10452Cd0e
0 ETH0.0013241116.93373946
Send Multi Sig174166492023-06-05 20:22:11566 days ago1685996531IN
0x612c8118...10452Cd0e
0 ETH0.0025469232.58025711
Send Multi Sig174166042023-06-05 20:13:11566 days ago1685995991IN
0x612c8118...10452Cd0e
0 ETH0.003063139.18522729
Send Multi Sig174163832023-06-05 19:27:35566 days ago1685993255IN
0x612c8118...10452Cd0e
0 ETH0.0031864740.75711527
Send Multi Sig174162832023-06-05 19:07:23566 days ago1685992043IN
0x612c8118...10452Cd0e
0 ETH0.0042798754.75081618
Send Multi Sig174162592023-06-05 19:02:35566 days ago1685991755IN
0x612c8118...10452Cd0e
0 ETH0.0048680362.2654085
Send Multi Sig174161842023-06-05 18:47:35566 days ago1685990855IN
0x612c8118...10452Cd0e
0 ETH0.0033499942.86179181
Send Multi Sig174158262023-06-05 17:35:23566 days ago1685986523IN
0x612c8118...10452Cd0e
0 ETH0.0041800653.47406982
Send Multi Sig174153512023-06-05 15:58:35566 days ago1685980715IN
0x612c8118...10452Cd0e
0 ETH0.0073331393.81006309
Send Multi Sig174142472023-06-05 12:13:11566 days ago1685967191IN
0x612c8118...10452Cd0e
0 ETH0.0019889525.44002951
Send Multi Sig174141002023-06-05 11:43:35566 days ago1685965415IN
0x612c8118...10452Cd0e
0 ETH0.0016813121.50841118
Send Multi Sig174140392023-06-05 11:31:23566 days ago1685964683IN
0x612c8118...10452Cd0e
0 ETH0.0016214520.74159971
Send Multi Sig174113162023-06-05 2:16:23567 days ago1685931383IN
0x612c8118...10452Cd0e
0 ETH0.0017195921.99809472
Send Multi Sig174112432023-06-05 2:01:47567 days ago1685930507IN
0x612c8118...10452Cd0e
0 ETH0.0016858321.56291764
Send Multi Sig174099542023-06-04 21:39:11567 days ago1685914751IN
0x612c8118...10452Cd0e
0 ETH0.0018755523.98956464
Send Multi Sig174098502023-06-04 21:17:47567 days ago1685913467IN
0x612c8118...10452Cd0e
0 ETH0.0016337120.89948146
Send Multi Sig174098082023-06-04 21:09:23567 days ago1685912963IN
0x612c8118...10452Cd0e
0 ETH0.0017330522.17368427
Send Multi Sig174096962023-06-04 20:46:47567 days ago1685911607IN
0x612c8118...10452Cd0e
0 ETH0.0016086120.57845842
Send Multi Sig174096512023-06-04 20:37:47567 days ago1685911067IN
0x612c8118...10452Cd0e
0 ETH0.0016440821.02888993
Transfer174094352023-06-04 19:54:23567 days ago1685908463IN
0x612c8118...10452Cd0e
0.15769614 ETH0.0005613121.8071045
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174959912023-06-17 0:34:47555 days ago1686962087
0x612c8118...10452Cd0e
0.65747504 ETH
174946792023-06-16 20:09:35555 days ago1686946175
0x612c8118...10452Cd0e
0.124 ETH
174945172023-06-16 19:36:59555 days ago1686944219
0x612c8118...10452Cd0e
0.059 ETH
174944742023-06-16 19:28:23555 days ago1686943703
0x612c8118...10452Cd0e
0.183524 ETH
174883972023-06-15 22:59:23556 days ago1686869963
0x612c8118...10452Cd0e
0.0722 ETH
174882552023-06-15 22:30:47556 days ago1686868247
0x612c8118...10452Cd0e
0.085 ETH
174881682023-06-15 22:13:11556 days ago1686867191
0x612c8118...10452Cd0e
0.157064 ETH
174166492023-06-05 20:22:11566 days ago1685996531
0x612c8118...10452Cd0e
0.084 ETH
174166042023-06-05 20:13:11566 days ago1685995991
0x612c8118...10452Cd0e
0.032 ETH
174163832023-06-05 19:27:35566 days ago1685993255
0x612c8118...10452Cd0e
0.055 ETH
174162832023-06-05 19:07:23566 days ago1685992043
0x612c8118...10452Cd0e
0.028 ETH
174162592023-06-05 19:02:35566 days ago1685991755
0x612c8118...10452Cd0e
0.025 ETH
174161842023-06-05 18:47:35566 days ago1685990855
0x612c8118...10452Cd0e
0.024 ETH
174158262023-06-05 17:35:23566 days ago1685986523
0x612c8118...10452Cd0e
0.028 ETH
174153512023-06-05 15:58:35566 days ago1685980715
0x612c8118...10452Cd0e
0.024 ETH
174142472023-06-05 12:13:11566 days ago1685967191
0x612c8118...10452Cd0e
0.025 ETH
174141002023-06-05 11:43:35566 days ago1685965415
0x612c8118...10452Cd0e
0.026 ETH
174140392023-06-05 11:31:23566 days ago1685964683
0x612c8118...10452Cd0e
0.025 ETH
174113162023-06-05 2:16:23567 days ago1685931383
0x612c8118...10452Cd0e
0.026 ETH
174112432023-06-05 2:01:47567 days ago1685930507
0x612c8118...10452Cd0e
0.025 ETH
174099542023-06-04 21:39:11567 days ago1685914751
0x612c8118...10452Cd0e
0.023 ETH
174098502023-06-04 21:17:47567 days ago1685913467
0x612c8118...10452Cd0e
0.02 ETH
174098082023-06-04 21:09:23567 days ago1685912963
0x612c8118...10452Cd0e
0.02 ETH
174096962023-06-04 20:46:47567 days ago1685911607
0x612c8118...10452Cd0e
0.03 ETH
174096512023-06-04 20:37:47567 days ago1685911067
0x612c8118...10452Cd0e
0.025 ETH
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Minimal Proxy Contract for 0xe8e847cf573fc8ed75621660a36affd18c543d7e

Contract Name:
WalletSimple

Compiler Version
v0.7.5+commit.eb77ed08

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, Apache-2.0 license

Contract Source Code (Solidity Multiple files format)

File 1 of 4: WalletSimple.sol
// 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');
    }
}

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"msgSender","type":"address"},{"indexed":false,"internalType":"address","name":"otherSigner","type":"address"},{"indexed":false,"internalType":"bytes32","name":"operation","type":"bytes32"}],"name":"BatchTransacted","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"BatchTransfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"Deposited","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"msgSender","type":"address"}],"name":"SafeModeActivated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"msgSender","type":"address"},{"indexed":false,"internalType":"address","name":"otherSigner","type":"address"},{"indexed":false,"internalType":"bytes32","name":"operation","type":"bytes32"},{"indexed":false,"internalType":"address","name":"toAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"Transacted","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"activateSafeMode","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"forwarderAddress","type":"address"},{"internalType":"address","name":"tokenContractAddress","type":"address"}],"name":"flushForwarderTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getNextSequenceId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"allowedSigners","type":"address[]"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"initialized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"signer","type":"address"}],"name":"isSigner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"safeMode","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"toAddress","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"expireTime","type":"uint256"},{"internalType":"uint256","name":"sequenceId","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"sendMultiSig","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"values","type":"uint256[]"},{"internalType":"uint256","name":"expireTime","type":"uint256"},{"internalType":"uint256","name":"sequenceId","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"sendMultiSigBatch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"toAddress","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"address","name":"tokenContractAddress","type":"address"},{"internalType":"uint256","name":"expireTime","type":"uint256"},{"internalType":"uint256","name":"sequenceId","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"sendMultiSigToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"signers","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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