SOLVED How to retrieve Ether from old multisig wallet contract?

Question

I have a 1.5 years old multisig wallet contract. I am able to import it to Ethereum Wallet (version 0.11.1) through Contracts -> Watch Contract menu and that way I can run some functions on it ("Add owner", "Execute", etc.). After reading the contract code, it would appear that "Execute" is the function that is used to transfer Ether out of the contract. I'm quite hesitant to use it, though.

"Execute" takes three parameters, address, value and data. Is it safe to leave data empty? And is the unit of value wei or ETH? In the contract there is daily limit of 100000000000000000000000000(!). I assume this is wei, which would mean it's 100 million ETH. The contract also has multiple security warnings on it, if there's something there I should take into account, i'd be supper happy to know.

Any help is appreciated! Here's the contract info: https://etherscan.io/address/0x5248e5fd5d3b43126e5352807f75d6a7d6d7eafb

SOLVED

The solution in this case turned out to be pretty simple. After syncing geth (fastsync) I was able to import wallet contract by using older version of Ethereum Wallet (0.8.9).

See also this issue: https://github.com/ethereum/mist/issues/4032

Answer 1

Here is an answer that I'm completely unsure of, so wait for some responses before you try it...

Implement, compile and deploy the follow contract:

pragma solidity 0.4.24;

contract MyContract {
    address public myWallet;

    constructor() public {
        myWallet = msg.sender;
    }

    function() public payable {
        myWallet.transfer(address(this).balance);
    }
}

Then, from the off-chain, call function execute with the address of this contract and the value that you want to withdraw. Needless to say, all amounts are always in WEI.

Here is a web3.js-v1 example:

let fs = require("fs");
let Web3 = require("web3");
let web3 = new Web3(NODE_ADDRESS);

function deployed(contractName, contractAddr) {
    let abi = fs.readFileSync(contractName + ".abi").toString();
    return new web3.eth.Contract(JSON.parse(abi), contractAddr);
}

async function send(transaction) {
    let block = await web3.eth.getBlock("latest");
    let options = {
        to  : transaction._parent._address,
        data: transaction.encodeABI(),
        gas : block.gasLimit
    };
    let signedTransaction = await web3.eth.accounts.signTransaction(options, PRIVATE_KEY);
    return await web3.eth.sendSignedTransaction(signedTransaction.rawTransaction);
}

async function withdraw(amount) {
    let multiOwned = deployed("MultiOwned", "0x5248e5fd5d3b43126e5352807f75d6a7d6d7eafb");
    let myContract = deployed("MyContract", "0xThePublicAddressOfMyContractOnTheMainNet");
    let receipt = await send(multiOwned.methods.execute(myContract._address, amount, []));
    console.log(JSON.stringify(receipt, null, 4));
}

Like I said, I'm unsure of this answer, so wait for some comments, feedback and suggestions...

---

UPDATE:

You can withdraw your funds with a few modifications to the code above.

Step #1 - create a file called withdraw.js with the following contents:

// These parameters serve as an example:
let ETH_NODE_ADDRESS    = "http://localhost:8545";
let WITHDRAW_WEI_AMOUNT = "1000000000000000000"; // 1 ether
let WALLET_PUBLIC_ADDR  = "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf";
let WALLET_PRIVATE_KEY  = "0000000000000000000000000000000000000000000000000000000000000001";
let REQUIRED_CONFIRMS   = 3;
let SIGNER_PRIVATE_KEYS = [
    "0000000000000000000000000000000000000000000000000000000000000002",
    "0000000000000000000000000000000000000000000000000000000000000003",
    "0000000000000000000000000000000000000000000000000000000000000004",
    "0000000000000000000000000000000000000000000000000000000000000005",
];


let MS_CONTRACT_ADDR = "0x5248e5fd5d3b43126e5352807f75d6a7d6d7eafb";
let MS_CONTRACT_ABI  = '[{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"removeOwner","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_addr","type":"address"}],"name":"isOwner","outputs":[{"name":"","type":"bool"}],"type":"function"},{"constant":true,"inputs":[],"name":"m_numOwners","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":true,"inputs":[],"name":"m_lastDay","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[],"name":"resetSpentToday","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"m_spentToday","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"addOwner","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"m_required","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"_h","type":"bytes32"}],"name":"confirm","outputs":[{"name":"","type":"bool"}],"type":"function"},{"constant":false,"inputs":[{"name":"_newLimit","type":"uint256"}],"name":"setDailyLimit","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"},{"name":"_data","type":"bytes"}],"name":"execute","outputs":[{"name":"_r","type":"bytes32"}],"type":"function"},{"constant":false,"inputs":[{"name":"_operation","type":"bytes32"}],"name":"revoke","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_newRequired","type":"uint256"}],"name":"changeRequirement","outputs":[],"type":"function"},{"constant":true,"inputs":[{"name":"_operation","type":"bytes32"},{"name":"_owner","type":"address"}],"name":"hasConfirmed","outputs":[{"name":"","type":"bool"}],"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"}],"name":"kill","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"}],"name":"changeOwner","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"m_dailyLimit","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"inputs":[{"name":"_owners","type":"address[]"},{"name":"_required","type":"uint256"},{"name":"_daylimit","type":"uint256"}],"type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexed":false,"name":"operation","type":"bytes32"}],"name":"Confirmation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexed":false,"name":"operation","type":"bytes32"}],"name":"Revoke","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"oldOwner","type":"address"},{"indexed":false,"name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newOwner","type":"address"}],"name":"OwnerAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"oldOwner","type":"address"}],"name":"OwnerRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newRequirement","type":"uint256"}],"name":"RequirementChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexed":false,"name":"value","type":"uint256"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"data","type":"bytes"}],"name":"SingleTransact","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexed":false,"name":"operation","type":"bytes32"},{"indexed":false,"name":"value","type":"uint256"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"data","type":"bytes"}],"name":"MultiTransact","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"operation","type":"bytes32"},{"indexed":false,"name":"initiator","type":"address"},{"indexed":false,"name":"value","type":"uint256"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"data","type":"bytes"}],"name":"ConfirmationNeeded","type":"event"}]';
let MY_CONTRACT_ABI  = '[{"constant":true,"inputs":[],"name":"myWallet","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"}]';
let MY_CONTRACT_BIN  = "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";


let Web3 = require("web3");
let web3 = new Web3(ETH_NODE_ADDRESS);


function deployed(abi, address) {
    return new web3.eth.Contract(JSON.parse(abi), address);
}


async function deploy(abi, bin, args, key) {
    let contract = new web3.eth.Contract(JSON.parse(abi));
    let handle = await send(contract.deploy({data: bin, arguments: args}), key);
    return new web3.eth.Contract(JSON.parse(abi), handle.contractAddress);
}


async function send(transaction, key) {
    let block = await web3.eth.getBlock("latest");
    let options = {
        to  : transaction._parent._address,
        data: transaction.encodeABI(),
        gas : block.gasLimit
    };
    let signedTransaction = await web3.eth.accounts.signTransaction(options, key);
    return await web3.eth.sendSignedTransaction(signedTransaction.rawTransaction);
}


async function withdraw() {
    let msContract = deployed(MS_CONTRACT_ABI, MS_CONTRACT_ADDR);
    let myContract = await deploy(MY_CONTRACT_ABI, MY_CONTRACT_BIN, [], WALLET_PRIVATE_KEY);
    let balanceBefore = await web3.eth.getBalance(WALLET_PUBLIC_ADDR);
    for (let i = 0; i < REQUIRED_CONFIRMS; i++)
        await send(msContract.methods.execute(myContract._address, WITHDRAW_WEI_AMOUNT, "0x00"), SIGNER_PRIVATE_KEYS[i]);
    let balanceAfter = await web3.eth.getBalance(WALLET_PUBLIC_ADDR);
    console.log("balanceBefore =", balanceBefore);
    console.log("balanceAfter  =", balanceAfter );
}


withdraw();

Step #2 - set the parameters at the top of this file to whatever you have on your system:

let ETH_NODE_ADDRESS    = "http://localhost:8545";
let WITHDRAW_WEI_AMOUNT = "1000000000000000000"; // 1 ether
let WALLET_PUBLIC_ADDR  = "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf";
let WALLET_PRIVATE_KEY  = "0000000000000000000000000000000000000000000000000000000000000001";
let REQUIRED_CONFIRMS   = 3;
let SIGNER_PRIVATE_KEYS = [
    "0000000000000000000000000000000000000000000000000000000000000002",
    "0000000000000000000000000000000000000000000000000000000000000003",
    "0000000000000000000000000000000000000000000000000000000000000004",
    "0000000000000000000000000000000000000000000000000000000000000005",
];

Note that you'll be using this wallet (WALLET_PUBLIC_ADDR and WALLET_PRIVATE_KEY) for:

• Deploying the MyContract contract that I have described at the top of this answer to mainnet
• Withdrawing the funds from the multi-sig wallet that you have previously deployed to mainnet

So be sure to load some funds into this wallet (I'd say 0.2 Ether should do).

Step #3 - download Node.js and npm from https://nodejs.org/en/, and then install them.

Step #4 - open a command line at the same path where you saved the file withdraw.js, and then:

• Run npm install web3
• Run node withdraw.js

---

UPDATE #2:

A few notes on the solution above:

1. Be sure to load some funds into each one of the signer-wallets, in particularly the last one (e.g., suppose that you need 3 out of 5 signers, then the 3rd wallet on the list requires a little more than the first two). My script requires only the private keys of the signer-wallets, but you'll need their public addresses as well of course, in order to load funds into them.

2. Note that I am using the compiled code of both my contract (provided at the top of this answer) and your contract (deployed to mainnet), in order to save you the hustle of doing it yourself (compiling my contract and importing your compiled contract). Nevertheless, you shouldn't trust me with this piece of data, or even suppose someone has hacked this answer and changed it.

So here is how you can do it yourself, in case you decide not to trust me:

let MS_CONTRACT_ADDR = "Paste your contract address here, preceded by 0x"
let MS_CONTRACT_ABI  = 'Copy your contract abi from etherscan and paste it here'
let MY_CONTRACT_ABI  = 'Compile my contract and paste its abi here'
let MY_CONTRACT_BIN  = "Compile my contract and paste its bin here, preceded by 0x"