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•  contract CloneFactory
•    - function createClone(address target, ...
•    - function isClone(address target, addr ...
•    - function transfer(address _to, uint25 ...
•    - function balanceOf(address _owner)
•  contract Forwarder
•    - function init(address _parentAddress)
•    - function flushTokens(address tokenCon ...
•    - function flush()
•  contract WalletSimple
•    - function init(address[] calldata allo ...
•    - function getNetworkId()
•    - function getTokenNetworkId()
•    - function getBatchNetworkId()
•    - function isSigner(address signer)
•    - function sendMultiSig(
•    - function sendMultiSigBatch(
•    - function batchTransfer(
•    - function sendMultiSigToken(
•    - function flushForwarderTokens(
•    - function verifyMultiSig(
•    - function activateSafeMode()
•    - function recoverAddressFromSignature(
•    - function tryUpdateSequenceId(uint256 ...
•    - function getNextSequenceId()
•  contract WalletFactory is CloneFac ... *
•    - function createWallet(address[] calld ...

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/**
 *Submitted for verification at Etherscan.io on 2021-01-13
*/

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.7.5;

/*
    The MIT License (MIT)
    Copyright (c) 2018 Murray Software, LLC.
    Permission is hereby granted, free of charge, to any person obtaining
    a copy of this software and associated documentation files (the
    "Software"), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:
    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
//solhint-disable max-line-length
//solhint-disable no-inline-assembly

contract CloneFactory {
  function createClone(address target, bytes32 salt)
    internal
    returns (address payable result)
  {
    bytes20 targetBytes = bytes20(target);
    assembly {
      // load the next free memory slot as a place to store the clone contract data
      let clone := mload(0x40)

      // The bytecode block below is responsible for contract initialization
      // during deployment, it is worth noting the proxied contract constructor will not be called during
      // the cloning procedure and that is why an initialization function needs to be called after the
      // clone is created
      mstore(
        clone,
        0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
      )

      // This stores the address location of the implementation contract
      // so that the proxy knows where to delegate call logic to
      mstore(add(clone, 0x14), targetBytes)

      // The bytecode block is the actual code that is deployed for each clone created.
      // It forwards all calls to the already deployed implementation via a delegatecall
      mstore(
        add(clone, 0x28),
        0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
      )

      // deploy the contract using the CREATE2 opcode
      // this deploys the minimal proxy defined above, which will proxy all
      // calls to use the logic defined in the implementation contract `target`
      result := create2(0, clone, 0x37, salt)
    }
  }

  function isClone(address target, address query)
    internal
    view
    returns (bool result)
  {
    bytes20 targetBytes = bytes20(target);
    assembly {
      // load the next free memory slot as a place to store the comparison clone
      let clone := mload(0x40)

      // The next three lines store the expected bytecode for a miniml proxy
      // that targets `target` as its implementation contract
      mstore(
        clone,
        0x363d3d373d3d3d363d7300000000000000000000000000000000000000000000
      )
      mstore(add(clone, 0xa), targetBytes)
      mstore(
        add(clone, 0x1e),
        0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
      )

      // the next two lines store the bytecode of the contract that we are checking in memory
      let other := add(clone, 0x40)
      extcodecopy(query, other, 0, 0x2d)

      // Check if the expected bytecode equals the actual bytecode and return the result
      result := and(
        eq(mload(clone), mload(other)),
        eq(mload(add(clone, 0xd)), mload(add(other, 0xd)))
      )
    }
  }
}

/**
 * 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);
}

/**
 * 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;
    this.flush();
  }

  /**
   * 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 {
    this.flush();
  }

  /**
   * Default function; Gets called when Ether is deposited with no data, and forwards it to the parent address
   */
  receive() external payable {
    this.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;
    }

    require(
      instance.transfer(parentAddress, forwarderBalance),
      "Token flush failed"
    );
  }

  /**
   * Flush the entire balance of the contract to the parent address.
   */
  function flush() external {
    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);
  }
}

/**
 *
 * 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 lastSequenceId;
  uint256 private constant MAX_SEQUENCE_ID_INCREASE = 10000;

  /**
   * 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
    );

    ERC20Interface instance = ERC20Interface(tokenContractAddress);
    require(instance.transfer(toAddress, value), "ERC20 Transfer call failed");
  }

  /**
   * 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
    tryUpdateSequenceId(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 is greater than the currently stored value and updates the stored value.
   * By requiring sequence IDs to always increase, we ensure that the same signature can't be used twice.
   * @param sequenceId The new sequenceId to use
   */
  function tryUpdateSequenceId(uint256 sequenceId) private onlySigner {
    require(sequenceId > lastSequenceId, "sequenceId is too low");

    // Block sequence IDs which are much higher than the current
    // This prevents people blocking the contract by using very large sequence IDs quickly
    require(
      sequenceId <= lastSequenceId + MAX_SEQUENCE_ID_INCREASE,
      "sequenceId is too high"
    );

    lastSequenceId = sequenceId;
  }

  /**
   * Gets the next available sequence ID for signing when using executeAndConfirm
   * returns the sequenceId one higher than the one currently stored
   */
  function getNextSequenceId() external view returns (uint256) {
    return lastSequenceId + 1;
  }
}

contract WalletFactory is CloneFactory {
  address public implementationAddress;

  event WalletCreated(address newWalletAddress, address[] allowedSigners);

  constructor(address _implementationAddress) {
    implementationAddress = _implementationAddress;
  }

  function createWallet(address[] calldata allowedSigners, bytes32 salt)
    external
  {
    // include the signers in the salt so any contract deployed to a given address must have the same signers
    bytes32 finalSalt = keccak256(abi.encodePacked(allowedSigners, salt));

    address payable clone = createClone(implementationAddress, finalSalt);
    WalletSimple(clone).init(allowedSigners);
    emit WalletCreated(clone, allowedSigners);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_implementationAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newWalletAddress","type":"address"},{"indexed":false,"internalType":"address[]","name":"allowedSigners","type":"address[]"}],"name":"WalletCreated","type":"event"},{"inputs":[{"internalType":"address[]","name":"allowedSigners","type":"address[]"},{"internalType":"bytes32","name":"salt","type":"bytes32"}],"name":"createWallet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"implementationAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000dcd6f2f38823977c2a1e949daadd09947dfc024a

-----Decoded View---------------
Arg [0] : _implementationAddress (address): 0xdCD6f2f38823977c2a1e949daadD09947DfC024a

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000dcd6f2f38823977c2a1e949daadd09947dfc024a

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ipfs://29d22a0b4625c5a1f419d361dcbb661ae1ef5cca98c1b3b144fc9eeab31ff6ca