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•  contract SimpleMultiSig *
•    - function execute(uint8[] memory sigV, ...
•    - function getVersion()
•    - function getOwersLength()
•    - function ()

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/**
 *Submitted for verification at Etherscan.io on 2020-03-28
*/

pragma solidity ^0.5.13;

contract SimpleMultiSig {

// EIP712 Precomputed hashes:
// keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,bytes32 salt)")
bytes32 constant EIP712DOMAINTYPE_HASH = 0xd87cd6ef79d4e2b95e15ce8abf732db51ec771f1ca2edccf22a46c729ac56472;

// keccak256("Simple MultiSig")
bytes32 constant NAME_HASH = 0xb7a0bfa1b79f2443f4d73ebb9259cddbcd510b18be6fc4da7d1aa7b1786e73e6;

// keccak256("1")
bytes32 constant VERSION_HASH = 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6;

// keccak256("MultiSigTransaction(address destination,uint256 value,bytes data,uint256 nonce,address executor,uint256 gasLimit)")
bytes32 constant TXTYPE_HASH = 0x3ee892349ae4bbe61dce18f95115b5dc02daf49204cc602458cd4c1f540d56d7;

bytes32 constant SALT = 0x251543af6a222378665a76fe38dbceae4871a070b7fdaf5c6c30cf758dc33cc0;

  event Execute(address[] _confirmAddrs, address _destination, uint _value, bytes data);
  event Deposit(address indexed _from,uint _value);

  // debug events
  // event DbgExecuteParam(bytes32 sperator, bytes32 txInputHash, bytes32 totalHash, bytes txInput);
  // event DbgRecover(address _recovered);

  uint public nonce;                 // (only) mutable state
  uint public threshold;             // immutable state
  mapping (address => bool) isOwner; // immutable state
  address[] public ownersArr;        // immutable state

  bytes32 DOMAIN_SEPARATOR;          // hash for EIP712, computed from contract address

  // Note that owners_ must be strictly increasing, in order to prevent duplicates
  constructor(uint threshold_, address[] memory owners_, uint chainId) public {
    require(owners_.length <= 10 && threshold_ <= owners_.length && threshold_ > 0, "0<threshold<owners.length");

    address lastAdd = address(0);
    for (uint i = 0; i < owners_.length; i++) {
      require(owners_[i] > lastAdd, "repeated owner or not sorted");
      isOwner[owners_[i]] = true;
      lastAdd = owners_[i];
    }
    ownersArr = owners_;
    threshold = threshold_;

    DOMAIN_SEPARATOR = keccak256(abi.encode(EIP712DOMAINTYPE_HASH,
                                            NAME_HASH,
                                            VERSION_HASH,
                                            chainId,
                                            this,
                                            SALT));
  }

  // Note that address recovered from signatures must be strictly increasing, in order to prevent duplicates
  function execute(uint8[] memory sigV, bytes32[] memory sigR, bytes32[] memory sigS,
    address destination, uint value, bytes memory data, address executor, uint gasLimit) public {

    require(sigR.length == threshold, "R len not equal to threshold");
    require(sigR.length == sigS.length && sigR.length == sigV.length, "length of r/s/v not match");
    require(executor == msg.sender || executor == address(0), "wrong executor");

    // EIP712 scheme: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md
    bytes32 txInputHash = keccak256(abi.encode(TXTYPE_HASH, destination, value, keccak256(data), nonce, executor, gasLimit));
    bytes32 totalHash = keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, txInputHash));

    // emit DbgExecuteParam(DOMAIN_SEPARATOR, txInputHash, totalHash, abi.encode(TXTYPE_HASH, destination, value, keccak256(data), nonce, executor, gasLimit));

    address lastAdd = address(0); // cannot have address(0) as an owner
    address[] memory confirmAddrs = new address[](threshold);
    for (uint i = 0; i < threshold; i++) {
      address recovered = ecrecover(totalHash, sigV[i], sigR[i], sigS[i]);
      require(recovered > lastAdd && isOwner[recovered], "Verify sig failed");
      // emit DbgRecover(recovered);
      confirmAddrs[i] = recovered;
      lastAdd = recovered;
    }

    // If we make it here all signatures are accounted for.
    // The address.call() syntax is no longer recommended, see:
    // https://github.com/ethereum/solidity/issues/2884
    nonce = nonce + 1;
    bool success = false;
    assembly { success := call(gasLimit, destination, value, add(data, 0x20), mload(data), 0, 0) }
    require(success, "not_success");
    emit Execute(confirmAddrs, destination, value, data);
  }

  function getVersion() external pure returns (string memory) {
    return "1"; //
  }

  function getOwersLength() external view returns (int8) {
    return int8(ownersArr.length); //owners.length <= 10 (see constructor), so type convert is ok
  }

  function () external payable {
    emit Deposit(msg.sender, msg.value);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"uint256","name":"threshold_","type":"uint256"},{"internalType":"address[]","name":"owners_","type":"address[]"},{"internalType":"uint256","name":"chainId","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address[]","name":"_confirmAddrs","type":"address[]"},{"indexed":false,"internalType":"address","name":"_destination","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"Execute","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":false,"inputs":[{"internalType":"uint8[]","name":"sigV","type":"uint8[]"},{"internalType":"bytes32[]","name":"sigR","type":"bytes32[]"},{"internalType":"bytes32[]","name":"sigS","type":"bytes32[]"},{"internalType":"address","name":"destination","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"address","name":"executor","type":"address"},{"internalType":"uint256","name":"gasLimit","type":"uint256"}],"name":"execute","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getOwersLength","outputs":[{"internalType":"int8","name":"","type":"int8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getVersion","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[],"name":"nonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"ownersArr","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"threshold","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]

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

-----Decoded View---------------
Arg [0] : threshold_ (uint256): 3
Arg [1] : owners_ (address[]): 0x5b13592C8da41424a8c9FA44Cf9f1d650c88ff22,0x6aD9ecAa8Ad12DBC5609DdC26FED29A56d1167c9,0xF1648230e7e4E424fd74ACa03927DC9C74CBe1D8,0xf3a343A8DF046536837Ee5D72beee70BeD1D324d
Arg [2] : chainId (uint256): 1

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [4] : 0000000000000000000000005b13592c8da41424a8c9fa44cf9f1d650c88ff22
Arg [5] : 0000000000000000000000006ad9ecaa8ad12dbc5609ddc26fed29a56d1167c9
Arg [6] : 000000000000000000000000f1648230e7e4e424fd74aca03927dc9c74cbe1d8
Arg [7] : 000000000000000000000000f3a343a8df046536837ee5d72beee70bed1d324d

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