ETH Price: $2,657.06 (+1.47%)

Contract

0xcc8BBc5aD78Dfc0a182146693F9B385Ff0d0F3B5
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Spend ERC20119066852021-02-22 12:00:011447 days ago1613995201IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02346404191.63705389
Spend ERC20119064212021-02-22 10:58:331447 days ago1613991513IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02472542179.91545218
Spend ERC20119062802021-02-22 10:30:131447 days ago1613989813IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.03794936248.98541204
Spend ERC20119052942021-02-22 6:44:141448 days ago1613976254IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.020888152.00564707
Spend ERC20119045242021-02-22 3:56:441448 days ago1613966204IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02482444180.65181428
Spend ERC20119041982021-02-22 2:39:541448 days ago1613961594IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.01990546144.85550605
Spend ERC20119041892021-02-22 2:37:051448 days ago1613961425IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.01987811144.66910181
Spend ERC20119003792021-02-21 12:53:341448 days ago1613912014IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.01738061126.49276312
Spend ERC20118984882021-02-21 5:46:031449 days ago1613886363IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.01635021118.98336034
Spend ERC20118980742021-02-21 4:16:581449 days ago1613881018IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02144587140.70621016
Spend ERC20118977972021-02-21 3:12:361449 days ago1613877156IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.01974494143.64975991
Spend ERC20118925372021-02-20 7:41:531450 days ago1613806913IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02037031148.23833504
Spend ERC20118918462021-02-20 5:01:531450 days ago1613797313IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02619274190.57581785
Spend ERC20118915872021-02-20 4:00:051450 days ago1613793605IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02489943181.15002263
Spend ERC20118880752021-02-19 15:09:371450 days ago1613747377IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.03910643284.53462956
Spend ERC20118870932021-02-19 11:29:031450 days ago1613734143IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.01706437124.16958944
Spend ERC20118864152021-02-19 9:06:401451 days ago1613725600IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.0206124150
Spend ERC20118859442021-02-19 7:25:011451 days ago1613719501IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02247366163.54478315
Spend ERC20118853522021-02-19 5:10:471451 days ago1613711447IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02673705194.57020959
Spend ERC20118851862021-02-19 4:32:521451 days ago1613709172IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02124869154.63040742
Spend ERC20118851562021-02-19 4:26:081451 days ago1613708768IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02099994152.82025162
Spend ERC20118849702021-02-19 3:47:171451 days ago1613706437IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02169032157.84424685
Spend ERC20118803682021-02-18 10:47:351451 days ago1613645255IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02257655164.27916712
Spend ERC20118801232021-02-18 9:57:031451 days ago1613642223IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02669797175.13759391
Spend ERC20118799502021-02-18 9:20:211452 days ago1613640021IN
0xcc8BBc5a...Ff0d0F3B5
0 ETH0.02854579207.73265568
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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.