ETH Price: $3,170.28 (+2.72%)

Contract

0x66cb81682b05fDca0Ff4c81c5DD6Dc83679dc606
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Spend ERC20138791012021-12-26 6:10:431058 days ago1640499043IN
0x66cb8168...3679dc606
0 ETH0.0059908651.19085857
Spend ERC20138739282021-12-25 11:01:151059 days ago1640430075IN
0x66cb8168...3679dc606
0 ETH0.005236550
Spend ERC20138729512021-12-25 7:28:551059 days ago1640417335IN
0x66cb8168...3679dc606
0 ETH0.00778674.35209334
Spend ERC20138729312021-12-25 7:25:141059 days ago1640417114IN
0x66cb8168...3679dc606
0 ETH0.0073320170.00071381
Spend ERC20138689572021-12-24 16:23:541060 days ago1640363034IN
0x66cb8168...3679dc606
0 ETH0.009290288.68590659
Spend ERC20138677822021-12-24 12:05:281060 days ago1640347528IN
0x66cb8168...3679dc606
0 ETH0.0066329963.312477
Spend ERC20138662912021-12-24 6:31:031060 days ago1640327463IN
0x66cb8168...3679dc606
0 ETH0.0080013376.36469044
Spend ERC20138661022021-12-24 5:48:561060 days ago1640324936IN
0x66cb8168...3679dc606
0 ETH0.0061284158.50288462
Spend ERC20138660932021-12-24 5:47:591060 days ago1640324879IN
0x66cb8168...3679dc606
0 ETH0.0066568663.54761498
Spend ERC20138600672021-12-23 7:27:281061 days ago1640244448IN
0x66cb8168...3679dc606
0 ETH0.0073093869.76869758
Spend ERC20138600612021-12-23 7:25:551061 days ago1640244355IN
0x66cb8168...3679dc606
0 ETH0.0078668575.08973594
Spend ERC20138537542021-12-22 7:56:031062 days ago1640159763IN
0x66cb8168...3679dc606
0 ETH0.0056350853.79965251
Spend ERC20138537332021-12-22 7:51:561062 days ago1640159516IN
0x66cb8168...3679dc606
0 ETH0.0060677757.91740416
Spend ERC20138477352021-12-21 9:30:081063 days ago1640079008IN
0x66cb8168...3679dc606
0 ETH0.0053543651.10784739
Spend ERC20138476042021-12-21 9:02:091063 days ago1640077329IN
0x66cb8168...3679dc606
0 ETH0.0063411760.53397819
Spend ERC20138464792021-12-21 4:44:101063 days ago1640061850IN
0x66cb8168...3679dc606
0 ETH0.006903665.90302173
Spend ERC20138464742021-12-21 4:43:031063 days ago1640061783IN
0x66cb8168...3679dc606
0 ETH0.0069065765.93136033
Spend ERC20138345712021-12-19 8:49:501065 days ago1639903790IN
0x66cb8168...3679dc606
0 ETH0.0043220141.25394853
Spend ERC20138275582021-12-18 6:47:521066 days ago1639810072IN
0x66cb8168...3679dc606
0 ETH0.0066105663.10556282
Spend ERC20138274972021-12-18 6:33:101066 days ago1639809190IN
0x66cb8168...3679dc606
0 ETH0.0072806169.50201094
Spend ERC20138274792021-12-18 6:28:291066 days ago1639808909IN
0x66cb8168...3679dc606
0 ETH0.006709264.03256803
Spend ERC20138232262021-12-17 14:43:561067 days ago1639752236IN
0x66cb8168...3679dc606
0 ETH0.009977195.24318886
Spend ERC20138231592021-12-17 14:27:511067 days ago1639751271IN
0x66cb8168...3679dc606
0 ETH0.0065037862.07917821
Spend ERC20138223122021-12-17 11:13:511067 days ago1639739631IN
0x66cb8168...3679dc606
0 ETH0.0071110567.86779467
Spend ERC20138219842021-12-17 9:57:251067 days ago1639735045IN
0x66cb8168...3679dc606
0 ETH0.0064262361.34596877
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xB6020EBE...bE4B9321e
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
OwnbitMultiSig

Compiler Version
v0.4.26+commit.4563c3fc

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2021-01-01
*/

pragma solidity ^0.4.26;

// This is the ETH/ERC20 multisig contract for Ownbit.
//
// For 2-of-3 multisig, to authorize a spend, two signtures must be provided by 2 of the 3 owners.
// To generate the message to be signed, provide the destination address and
// spend amount (in wei) to the generateMessageToSign method.
// The signatures must be provided as the (v, r, s) hex-encoded coordinates.
// The S coordinate must be 0x00 or 0x01 corresponding to 0x1b and 0x1c, respectively.
//
// WARNING: The generated message is only valid until the next spend is executed.
//          after that, a new message will need to be calculated.
//
//
// INFO: This contract is ERC20 compatible.
// This contract can both receive ETH and ERC20 tokens.
// Notice that NFT (ERC721/ERC1155) is not supported. But can be transferred out throught spendAny.
// Last update time: 2020-12-21.
// copyright @ ownbit.io
//
// Accident Protection MultiSig, rules:
//
// Participants must keep themselves active by submitting transactions. 
// Not submitting any transaction within 3,000,000 ETH blocks (roughly 416 days) will be treated as wallet lost (i.e. accident happened), 
// other participants can still spend the assets as along as: valid signing count >= Min(mininual required count, active owners).
//

interface Erc20 {
  function approve(address, uint256) public;

  function transfer(address, uint256) public;
    
  //function balanceOf(address) view public returns (uint256);
}

contract OwnbitMultiSig {
    
  uint constant public MAX_OWNER_COUNT = 9;
  //uint constant public MAX_INACTIVE_BLOCKNUMBER = 300; //300 ETH blocks, roughly 1 hour, for testing.
  uint constant public MAX_INACTIVE_BLOCKNUMBER = 3000000; //3,000,000 ETH blocks, roughly 416 days.

  // The N addresses which control the funds in this contract. The
  // owners of M of these addresses will need to both sign a message
  // allowing the funds in this contract to be spent.
  mapping(address => uint256) private ownerBlockMap; //uint256 is the active blockNumber of this owner
  address[] private owners;
  uint private required;

  // The contract nonce is not accessible to the contract so we
  // implement a nonce-like variable for replay protection.
  uint256 private spendNonce = 0;
  
  // An event sent when funds are received.
  event Funded(address from, uint value);
  
  // An event sent when a spend is triggered to the given address.
  event Spent(address to, uint transfer);
  
  // An event sent when a spendERC20 is triggered to the given address.
  event SpentERC20(address erc20contract, address to, uint transfer);
  
  // An event sent when an spendAny is executed.
  event SpentAny(address to, uint transfer);

  modifier validRequirement(uint ownerCount, uint _required) {
    require (ownerCount <= MAX_OWNER_COUNT
            && _required <= ownerCount
            && _required >= 1);
    _;
  }
  
  /// @dev Contract constructor sets initial owners and required number of confirmations.
  /// @param _owners List of initial owners.
  /// @param _required Number of required confirmations.
  constructor(address[] _owners, uint _required) public validRequirement(_owners.length, _required) {
    for (uint i = 0; i < _owners.length; i++) {
        //onwer should be distinct, and non-zero
        if (ownerBlockMap[_owners[i]] > 0 || _owners[i] == address(0x0)) {
            revert();
        }
        ownerBlockMap[_owners[i]] = block.number;
    }
    owners = _owners;
    required = _required;
  }


  // The fallback function for this contract.
  function() public payable {
    if (msg.value > 0) {
        emit Funded(msg.sender, msg.value);
    }
  }
  
  // @dev Returns list of owners.
  // @return List of owner addresses.
  function getOwners() public view returns (address[]) {
    return owners;
  }
    
  function getSpendNonce() public view returns (uint256) {
    return spendNonce;
  }
    
  function getRequired() public view returns (uint) {
    return required;
  }
  
  //return the active block number of this owner
  function getOwnerBlock(address addr) public view returns (uint) {
    return ownerBlockMap[addr];
  }

  // Generates the message to sign given the output destination address and amount.
  // includes this contract's address and a nonce for replay protection.
  // One option to independently verify: https://leventozturk.com/engineering/sha3/ and select keccak
  function generateMessageToSign(address erc20Contract, address destination, uint256 value) private view returns (bytes32) {
    //the sequence should match generateMultiSigV2 in JS
    bytes32 message = keccak256(abi.encodePacked(address(this), erc20Contract, destination, value, spendNonce));
    return message;
  }
  
  function _messageToRecover(address erc20Contract, address destination, uint256 value) private view returns (bytes32) {
    bytes32 hashedUnsignedMessage = generateMessageToSign(erc20Contract, destination, value);
    bytes memory prefix = "\x19Ethereum Signed Message:\n32";
    return keccak256(abi.encodePacked(prefix, hashedUnsignedMessage));
  }
  
  // @destination: the ether receiver address.
  // @value: the ether value, in wei.
  // @vs, rs, ss: the signatures
  function spend(address destination, uint256 value, uint8[] vs, bytes32[] rs, bytes32[] ss) external {
    require(destination != address(this), "Not allow sending to yourself");
    require(address(this).balance >= value && value > 0, "balance or spend value invalid");
    require(_validSignature(address(0x0), destination, value, vs, rs, ss), "invalid signatures");
    spendNonce = spendNonce + 1;
    //transfer will throw if fails
    destination.transfer(value);
    emit Spent(destination, value);
  }
  
  // @erc20contract: the erc20 contract address.
  // @destination: the token receiver address.
  // @value: the token value, in token minimum unit.
  // @vs, rs, ss: the signatures
  function spendERC20(address destination, address erc20contract, uint256 value, uint8[] vs, bytes32[] rs, bytes32[] ss) external {
    require(destination != address(this), "Not allow sending to yourself");
    //transfer erc20 token
    //uint256 tokenValue = Erc20(erc20contract).balanceOf(address(this));
    require(value > 0, "Erc20 spend value invalid");
    require(_validSignature(erc20contract, destination, value, vs, rs, ss), "invalid signatures");
    spendNonce = spendNonce + 1;
    // transfer tokens from this contract to the destination address
    Erc20(erc20contract).transfer(destination, value);
    emit SpentERC20(erc20contract, destination, value);
  }
  
  //0x9 is used for spendAny
  //be careful with any action, data is not included into signature computation. So any data can be included in spendAny.
  //This is usually for some emergent recovery, for example, recovery of NTFs, etc.
  //Owners should not generate 0x9 based signatures in normal cases.
  function spendAny(address destination, uint256 value, uint8[] vs, bytes32[] rs, bytes32[] ss, bytes data) external {
    require(destination != address(this), "Not allow sending to yourself");
    require(_validSignature(address(0x9), destination, value, vs, rs, ss), "invalid signatures");
    spendNonce = spendNonce + 1;
    //transfer tokens from this contract to the destination address
    if (destination.call.value(value)(data)) {
        emit SpentAny(destination, value);
    }
  }
  
  //send a tx from the owner address to active the owner
  //Allow the owner to transfer some ETH, although this is not necessary.
  function active() external payable {
    require(ownerBlockMap[msg.sender] > 0, "Not an owner");
    ownerBlockMap[msg.sender] = block.number;
  }
  
  function getRequiredWithoutInactive() public view returns (uint) {
    uint activeOwner = 0;  
    for (uint i = 0; i < owners.length; i++) {
        //if the owner is active
        if (ownerBlockMap[owners[i]] + MAX_INACTIVE_BLOCKNUMBER >= block.number) {
            activeOwner++;
        }
    }
    //active owners still equal or greater then required
    if (activeOwner >= required) {
        return required;
    }
    //active less than required, all active must sign
    if (activeOwner >= 1) {
        return activeOwner;
    }
    //at least needs one signature.
    return 1;
  }

  // Confirm that the signature triplets (v1, r1, s1) (v2, r2, s2) ...
  // authorize a spend of this contract's funds to the given destination address.
  function _validSignature(address erc20Contract, address destination, uint256 value, uint8[] vs, bytes32[] rs, bytes32[] ss) private returns (bool) {
    require(vs.length == rs.length);
    require(rs.length == ss.length);
    require(vs.length <= owners.length);
    require(vs.length >= getRequiredWithoutInactive());
    bytes32 message = _messageToRecover(erc20Contract, destination, value);
    address[] memory addrs = new address[](vs.length);
    for (uint i = 0; i < vs.length; i++) {
        //recover the address associated with the public key from elliptic curve signature or return zero on error 
        addrs[i] = ecrecover(message, vs[i]+27, rs[i], ss[i]);
    }
    require(_distinctOwners(addrs));
    _updateActiveBlockNumber(addrs); //update addrs' active block number
    
    //check again, this is important to prevent inactive owners from stealing the money.
    require(vs.length >= getRequiredWithoutInactive(), "Active owners updated after the call, please call active() before calling spend.");
    
    return true;
  }
  
  // Confirm the addresses as distinct owners of this contract.
  function _distinctOwners(address[] addrs) private view returns (bool) {
    if (addrs.length > owners.length) {
        return false;
    }
    for (uint i = 0; i < addrs.length; i++) {
        //> 0 means one of the owner
        if (ownerBlockMap[addrs[i]] == 0) {
            return false;
        }
        //address should be distinct
        for (uint j = 0; j < i; j++) {
            if (addrs[i] == addrs[j]) {
                return false;
            }
        }
    }
    return true;
  }
  
  //update the active block number for those owners
  function _updateActiveBlockNumber(address[] addrs) private {
    for (uint i = 0; i < addrs.length; i++) {
        //only update block number for owners
        if (ownerBlockMap[addrs[i]] > 0) {
            ownerBlockMap[addrs[i]] = block.number;
        }
    }
  }
  
}

Contract Security Audit

Contract ABI

[{"constant":false,"inputs":[{"name":"destination","type":"address"},{"name":"erc20contract","type":"address"},{"name":"value","type":"uint256"},{"name":"vs","type":"uint8[]"},{"name":"rs","type":"bytes32[]"},{"name":"ss","type":"bytes32[]"}],"name":"spendERC20","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"active","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"getRequired","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"MAX_INACTIVE_BLOCKNUMBER","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"addr","type":"address"}],"name":"getOwnerBlock","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"destination","type":"address"},{"name":"value","type":"uint256"},{"name":"vs","type":"uint8[]"},{"name":"rs","type":"bytes32[]"},{"name":"ss","type":"bytes32[]"}],"name":"spend","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getOwners","outputs":[{"name":"","type":"address[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"destination","type":"address"},{"name":"value","type":"uint256"},{"name":"vs","type":"uint8[]"},{"name":"rs","type":"bytes32[]"},{"name":"ss","type":"bytes32[]"},{"name":"data","type":"bytes"}],"name":"spendAny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getSpendNonce","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"MAX_OWNER_COUNT","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getRequiredWithoutInactive","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"_owners","type":"address[]"},{"name":"_required","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Funded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"transfer","type":"uint256"}],"name":"Spent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"erc20contract","type":"address"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"transfer","type":"uint256"}],"name":"SpentERC20","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"transfer","type":"uint256"}],"name":"SpentAny","type":"event"}]

Deployed Bytecode

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Swarm Source

bzzr://b613b06855ae81ee59124d428e10c528ef699dc39b36ec9cc5ca527fc94d9282

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.