Golem 多方签名钱包解析
作者：李康
注意：修改了 submitTransactionWithSignatures 函数，由于 web3.eth.sign 行为发生了改变，见 https://github.com/ethereum/EIPs/issues/191
pragma solidity ^0.4.8;
/// @title Multisignature wallet - Allows multiple parties to agree on transactions before execution.
/// @author Stefan George - <[email protected]>
contract MultiSigWallet {
event Confirmation(address sender, bytes32 transactionHash);
event Revocation(address sender, bytes32 transactionHash);
event Submission(bytes32 transactionHash);
event Execution(bytes32 transactionHash);
event Deposit(address sender, uint value);
event OwnerAddition(address owner);
event OwnerRemoval(address owner);
event RequiredUpdate(uint required);
mapping (bytes32 => Transaction) public transactions;
mapping (bytes32 => mapping (address => bool)) public confirmations;
mapping (address => bool) public isOwner;
address[] owners;
bytes32[] transactionList;
uint public required;
struct Transaction {
address destination;
uint value;
bytes data;
uint nonce;
bool executed;
}
modifier onlyWallet() {
if (msg.sender != address(this))
throw;
_;
}
modifier signaturesFromOwners(bytes32 transactionHash, uint8[] v, bytes32[] rs) {
for (uint i=0; i<v.length; i++)
if (!isOwner[ecrecover(transactionHash, v[i], rs[i], rs[v.length + i])])
throw;
_;
}
modifier ownerDoesNotExist(address owner) {
if (isOwner[owner])
throw;
_;
}
modifier ownerExists(address owner) {
if (!isOwner[owner])
throw;
_;
}
modifier confirmed(bytes32 transactionHash, address owner) {
if (!confirmations[transactionHash][owner])
throw;
_;
}
modifier notConfirmed(bytes32 transactionHash, address owner) {
if (confirmations[transactionHash][owner])
throw;
_;
}
modifier notExecuted(bytes32 transactionHash) {
if (transactions[transactionHash].executed)
throw;
_;
}
modifier notNull(address destination) {
if (destination == 0)
throw;
_;
}
modifier validRequired(uint _ownerCount, uint _required) {
if ( _required > _ownerCount
|| _required == 0
|| _ownerCount == 0)
throw;
_;
}
function addOwner(address owner)
external
onlyWallet
ownerDoesNotExist(owner)
{
isOwner[owner] = true;
owners.push(owner);
OwnerAddition(owner);
}
function removeOwner(address owner)
external
onlyWallet
ownerExists(owner)
{
isOwner[owner] = false;
for (uint i=0; i<owners.length - 1; i++)
if (owners[i] == owner) {
owners[i] = owners[owners.length - 1];
break;
}
owners.length -= 1;
if (required > owners.length)
updateRequired(owners.length);
OwnerRemoval(owner);
}
function updateRequired(uint _required)
public
onlyWallet
validRequired(owners.length, _required)
{
required = _required;
RequiredUpdate(_required);
}
function addTransaction(address destination, uint value, bytes data, uint nonce)
private
notNull(destination)
returns (bytes32 transactionHash)
{
transactionHash = sha3(destination, value, data, nonce);
if (transactions[transactionHash].destination == 0) {
transactions[transactionHash] = Transaction({
destination: destination,
value: value,
data: data,
nonce: nonce,
executed: false
});
transactionList.push(transactionHash);
Submission(transactionHash);
}
}
function submitTransaction(address destination, uint value, bytes data, uint nonce)
external
returns (bytes32 transactionHash)
{
transactionHash = addTransaction(destination, value, data, nonce);
confirmTransaction(transactionHash);
}
function submitTransactionWithSignatures(address destination, uint value, bytes data, uint nonce, uint8[] v, bytes32[] rs)
external
returns (bytes32 transactionHash)
{
transactionHash = addTransaction(destination, value, data, nonce);
bytes memory prefix = "\x19Ethereum Signed Message:\n32";
bytes32 prefixedHash = sha3(prefix, transactionHash);
confirmTransactionWithSignatures(transactionHash, prefixedHash, v, rs);
}
function addConfirmation(bytes32 transactionHash, address owner)
private
notConfirmed(transactionHash, owner)
{
confirmations[transactionHash][owner] = true;
Confirmation(owner, transactionHash);
}
function confirmTransaction(bytes32 transactionHash)
public
ownerExists(msg.sender)
{
addConfirmation(transactionHash, msg.sender);
executeTransaction(transactionHash);
}
function confirmTransactionWithSignatures(bytes32 transactionHash, bytes32 prefixedHash, uint8[] v, bytes32[] rs)
public
signaturesFromOwners(prefixedHash, v, rs)
{
for (uint i=0; i<v.length; i++)
addConfirmation(transactionHash, ecrecover(prefixedHash, v[i], rs[i], rs[i + v.length]));
executeTransaction(transactionHash);
}
function executeTransaction(bytes32 transactionHash)
public
notExecuted(transactionHash)
{
if (isConfirmed(transactionHash)) {
Transaction tx = transactions[transactionHash];
tx.executed = true;
if (!tx.destination.call.value(tx.value)(tx.data))
throw;
Execution(transactionHash);
}
}
function revokeConfirmation(bytes32 transactionHash)
external
ownerExists(msg.sender)
confirmed(transactionHash, msg.sender)
notExecuted(transactionHash)
{
confirmations[transactionHash][msg.sender] = false;
Revocation(msg.sender, transactionHash);
}
function MultiSigWallet(address[] _owners, uint _required)
validRequired(_owners.length, _required)
{
for (uint i=0; i<_owners.length; i++)
isOwner[_owners[i]] = true;
owners = _owners;
required = _required;
}
function()
payable
{
if (msg.value > 0)
Deposit(msg.sender, msg.value);
}
function isConfirmed(bytes32 transactionHash)
public
constant
returns (bool)
{
uint count = 0;
for (uint i=0; i<owners.length; i++)
if (confirmations[transactionHash][owners[i]])
count += 1;
if (count == required)
return true;
}
function confirmationCount(bytes32 transactionHash)
external
constant
returns (uint count)
{
for (uint i=0; i<owners.length; i++)
if (confirmations[transactionHash][owners[i]])
count += 1;
}
function filterTransactions(bool isPending)
private
returns (bytes32[] _transactionList)
{
bytes32[] memory _transactionListTemp = new bytes32[](transactionList.length);
uint count = 0;
for (uint i=0; i<transactionList.length; i++)
if ( isPending && !transactions[transactionList[i]].executed
|| !isPending && transactions[transactionList[i]].executed)
{
_transactionListTemp[count] = transactionList[i];
count += 1;
}
_transactionList = new bytes32[](count);
for (i=0; i<count; i++)
if (_transactionListTemp[i] > 0)
_transactionList[i] = _transactionListTemp[i];
}
function getPendingTransactions()
external
constant
returns (bytes32[] _transactionList)
{
return filterTransactions(true);
}
function getExecutedTransactions()
external
constant
returns (bytes32[] _transactionList)
{
return filterTransactions(false);
}
}
在 https://remix.ethereum.org/ 中编译该合约，在右侧 Execution environment 中选择 Web3 provider，输入本地节点监听的端口，即可连接到本地搭建的私有网络中。
首先部署该合约，在右侧合约下方有 Create 按钮，输入合约构造函数所需的参数，然后点击该按钮部署至私有链中，注意在命令行终端中，将创建合约的账户解锁
personal.unlockAccount，接着启动挖矿功能miner.start()。本例中使用 2-of-3 的多方签名模式：Create : ["0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37", "0x0f5578914288da3b9a3f43ba41a2e6b4d3dd587a", "0x802c12459243cdafd34112561c478cefe3e714db"], 2其中 "0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37" 设为账户 A，"0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37" 设为账户 B，"0x802c12459243cdafd34112561c478cefe3e714db" 设为账户 C。 部署成功之后，可得到合约地址
0x9f94a748d21961f9dafc96274834793e16a4fac0，在终端可以得到该合约实例：> var multisigwallet_sol_multisigwalletContract = web3.eth.contract([{"constant":true,"inputs":[{"name":"","type":"bytes32"},{"name":"","type":"address"}],"name":"confirmations","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"destination","type":"address"},{"name":"value","type":"uint256"},{"name":"data","type":"bytes"},{"name":"nonce","type":"uint256"}],"name":"submitTransaction","outputs":[{"name":"transactionHash","type":"bytes32"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"owner","type":"address"}],"name":"removeOwner","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"isOwner","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"transactionHash","type":"bytes32"}],"name":"confirmationCount","outputs":[{"name":"count","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_required","type":"uint256"}],"name":"updateRequired","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"transactions","outputs":[{"name":"destination","type":"address"},{"name":"value","type":"uint256"},{"name":"data","type":"bytes"},{"name":"nonce","type":"uint256"},{"name":"executed","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"transactionHash","type":"bytes32"}],"name":"isConfirmed","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"owner","type":"address"}],"name":"addOwner","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"transactionHash","type":"bytes32"}],"name":"confirmTransaction","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"destination","type":"address"},{"name":"value","type":"uint256"},{"name":"data","type":"bytes"},{"name":"nonce","type":"uint256"},{"name":"v","type":"uint8[]"},{"name":"rs","type":"bytes32[]"}],"name":"submitTransactionWithSignatures","outputs":[{"name":"transactionHash","type":"bytes32"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"transactionHash","type":"bytes32"},{"name":"prefixedHash","type":"bytes32"},{"name":"v","type":"uint8[]"},{"name":"rs","type":"bytes32[]"}],"name":"confirmTransactionWithSignatures","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"transactionHash","type":"bytes32"}],"name":"executeTransaction","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"getPendingTransactions","outputs":[{"name":"_transactionList","type":"bytes32[]"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"required","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"getExecutedTransactions","outputs":[{"name":"_transactionList","type":"bytes32[]"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"transactionHash","type":"bytes32"}],"name":"revokeConfirmation","outputs":[],"payable":false,"type":"function"},{"inputs":[{"name":"_owners","type":"address[]"},{"name":"_required","type":"uint256"}],"payable":false,"type":"constructor"},{"payable":true,"type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"transactionHash","type":"bytes32"}],"name":"Confirmation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"transactionHash","type":"bytes32"}],"name":"Revocation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"transactionHash","type":"bytes32"}],"name":"Submission","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"transactionHash","type":"bytes32"}],"name":"Execution","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"}],"name":"OwnerAddition","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"}],"name":"OwnerRemoval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"required","type":"uint256"}],"name":"RequiredUpdate","type":"event"}]); > var multiSigWalletInstance = multisigwallet_sol_multisigwalletContract.at("0x9f94a748d21961f9dafc96274834793e16a4fac0")接着我们向该多方签名钱包存入一笔钱，调用该合约的 fallback 函数（在调用合约不存在的函数时，也会调用默认的 fallback 函数）：
> personal.unlockAccount(eth.coinbase) Unlock account 0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37 Passphrase: true > eth.sendTransaction({from : eth.coinbase, to : "0x9f94a748d21961f9dafc96274834793e16a4fac0", value : web3.toWei(9, "ether")}) "0xc6dd7d6cf4cbfcde3f4b1c4c0cd09eeaf115eb5f5d4d594fc486230bfb185919" > miner.start() null > eth.getBalance("0x9f94a748d21961f9dafc96274834793e16a4fac0") 9000000000000000000 > miner.stop() true有两种模式提交交易来转移资金：第一种， 使用
submitTransaction函数，即 A、B、C 三方中任意两方使用相同的参数（接收方、金额、data、nonce，4 元组来标识唯一一笔交易）来调用该函数，一旦达到多方签名阈值，钱包自动将以太币转入接收方账户中；第二种，使用submitTransactionWithSignatures，A、B、C 任意一方调用该函数，均可在参数中添加他人对钱包转账交易的签名，达到阈值即可。第一种方法：账户 A 与账户 B 均提交一笔确认交易
> miner.start() > eth.coinbase "0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37" > personal.unlockAccount(eth.coinbase) Unlock account 0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37 Passphrase: true > multiSigWalletInstance.submitTransaction.sendTransaction("0x703bfe10ec3da7b6655e9787f21ccd05b53265e5", 100, "ts", 0, {from : eth.coinbase, gas : 1000000}) "0x9483344d99cc903169136ad84f458297cec19f777385a30432b001c6382fb26a" > eth.getBalance("0x703bfe10ec3da7b6655e9787f21ccd05b53265e5") 0 > personal.unlockAccount("0x0f5578914288da3b9a3f43ba41a2e6b4d3dd587a") Unlock account 0x0f5578914288da3b9a3f43ba41a2e6b4d3dd587a Passphrase: true > > multiSigWalletInstance.submitTransaction.sendTransaction("0x703bfe10ec3da7b6655e9787f21ccd05b53265e5", 100, "ts", 0, {from : "0x0f5578914288da3b9a3f43ba41a2e6b4d3dd587a", gas : 1000000}) "0xf6938769a24b3aed8030c20534e0a1964e4d6e616d2b0ac94901211904c83d88" > > eth.getBalance("0x703bfe10ec3da7b6655e9787f21ccd05b53265e5") 100 > miner.stop()第二种方法：账户 A 提交一笔交易，其中交易的数据中包含账户 A 与 B 对同一笔转账交易（四元组）哈希的签名
//获取要签名的转账交易 <"0x703bfe10ec3da7b6655e9787f21ccd05b53265e5", 200, "ts2", 1> 哈希值，其中地址为 160 位，200 为 uint256 类型，"ts2" 为 bytes 类型, 1 为 uint256 类型，solidity-sha3 与 web3.sha3 略有差别，详细见 https://github.com/raineorshine/solidity-sha3/blob/master/src/index.js > web3.toHex(200) "0xc8" > web3.toHex("ts2") "0x747332" // 将 value 与 nonce 值分别扩充到 256位，其余不变 > txHash = web3.sha3("703bfe10ec3da7b6655e9787f21ccd05b53265e500000000000000000000000000000000000000000000000000000000000000c87473320000000000000000000000000000000000000000000000000000000000000001",{encoding:"hex"}) "0xd0dcee45718975f75da779890289089a71657e8923b81329473a6bb17c521c5c" > Asig = web3.eth.sign(eth.coinbase, txHash) "0xefa03c079a7631cb31250994412deac02f9aa41ac8faf0519a0f51dea17c715a60f31bc4808f16a1a16c63a7b5afbaca1d86c91bbec0c9b4f46cd38869691cf91c" > Bsig = web3.eth.sign(personal.listAccounts[1], txHash) "0xbcc7f2cc99b587f0cb2207470e811c1705997f1b37838c1a98c7e905fd5229b8083a0638f01fd53f11fb9f4f4d023cfaa4e4a5a5d931fe125d58a08b6f8e144e1b" > Ar = Asig.slice(0, 66) "0xefa03c079a7631cb31250994412deac02f9aa41ac8faf0519a0f51dea17c715a" > As = "0x" + Asig.slice(66, 130) "0x60f31bc4808f16a1a16c63a7b5afbaca1d86c91bbec0c9b4f46cd38869691cf9" > Av = 28 28 > Br = Bsig.slice(0, 66) "0xbcc7f2cc99b587f0cb2207470e811c1705997f1b37838c1a98c7e905fd5229b8" > Bs = "0x" + Bsig.slice(66, 130) "0x083a0638f01fd53f11fb9f4f4d023cfaa4e4a5a5d931fe125d58a08b6f8e144e" > Bv = 27 27 > multiSigWalletInstance.submitTransactionWithSignatures.sendTransaction("0x703bfe10ec3da7b6655e9787f21ccd05b53265e5", 200, "ts2", 1, [Av, Bv], [Ar, Br, As, Bs], {from : eth.coinbase, gas : 1000000}) "0x442c0533f482ffdcc14c334f36b5d9f8c39a41a4407cfb742bdebf9ad7fa4180" > miner.start() null > eth.getTransactionReceipt("0x442c0533f482ffdcc14c334f36b5d9f8c39a41a4407cfb742bdebf9ad7fa4180") { blockHash: "0xf48630e309251ef21cc05b943982fea52358ec7788b4ecc76c4359032f87fc63", blockNumber: 4754, contractAddress: null, cumulativeGasUsed: 246394, from: "0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37", gasUsed: 246394, logs: [{ address: "0x9f94a748d21961f9dafc96274834793e16a4fac0", blockHash: "0xf48630e309251ef21cc05b943982fea52358ec7788b4ecc76c4359032f87fc63", blockNumber: 4754, data: "0xd0dcee45718975f75da779890289089a71657e8923b81329473a6bb17c521c5c", logIndex: 0, removed: false, topics: ["0x1b15da2a2b1f440c8fb970f04466e7ccd3a8215634645d232bbc23c75785b5bb"], transactionHash: "0x442c0533f482ffdcc14c334f36b5d9f8c39a41a4407cfb742bdebf9ad7fa4180", transactionIndex: 0 }, { address: "0x9f94a748d21961f9dafc96274834793e16a4fac0", blockHash: "0xf48630e309251ef21cc05b943982fea52358ec7788b4ecc76c4359032f87fc63", blockNumber: 4754, data: "0x000000000000000000000000a3ac96fbe4b0dce5f6f89a715ca00934d68f6c37d0dcee45718975f75da779890289089a71657e8923b81329473a6bb17c521c5c", logIndex: 1, removed: false, topics: ["0xe1c52dc63b719ade82e8bea94cc41a0d5d28e4aaf536adb5e9cccc9ff8c1aeda"], transactionHash: "0x442c0533f482ffdcc14c334f36b5d9f8c39a41a4407cfb742bdebf9ad7fa4180", transactionIndex: 0 }, { address: "0x9f94a748d21961f9dafc96274834793e16a4fac0", blockHash: "0xf48630e309251ef21cc05b943982fea52358ec7788b4ecc76c4359032f87fc63", blockNumber: 4754, data: "0x0000000000000000000000000f5578914288da3b9a3f43ba41a2e6b4d3dd587ad0dcee45718975f75da779890289089a71657e8923b81329473a6bb17c521c5c", logIndex: 2, removed: false, topics: ["0xe1c52dc63b719ade82e8bea94cc41a0d5d28e4aaf536adb5e9cccc9ff8c1aeda"], transactionHash: "0x442c0533f482ffdcc14c334f36b5d9f8c39a41a4407cfb742bdebf9ad7fa4180", transactionIndex: 0 }, { address: "0x9f94a748d21961f9dafc96274834793e16a4fac0", blockHash: "0xf48630e309251ef21cc05b943982fea52358ec7788b4ecc76c4359032f87fc63", blockNumber: 4754, data: "0xd0dcee45718975f75da779890289089a71657e8923b81329473a6bb17c521c5c", logIndex: 3, removed: false, topics: ["0x7e9e1cb65db4927b1815f498cbaa226a15c277816f7df407573682110522c9b1"], transactionHash: "0x442c0533f482ffdcc14c334f36b5d9f8c39a41a4407cfb742bdebf9ad7fa4180", transactionIndex: 0 }], logsBloom: "0x00000000000000000000100000000000000000000000000000020000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000400000000000000000000000400000000000080400000000001000000000000000000000000000000000000000200000020000000000040000000000000000", root: "0xe364f018cc9cd462d46a7180c0eb49ca010dc283821844c3e5023f260db33517", to: "0x9f94a748d21961f9dafc96274834793e16a4fac0", transactionHash: "0x442c0533f482ffdcc14c334f36b5d9f8c39a41a4407cfb742bdebf9ad7fa4180", transactionIndex: 0 } > eth.getBalance("0x703bfe10ec3da7b6655e9787f21ccd05b53265e5") 300 > miner.stop() true
注意
上述 web3.eth.sign(msg) 函数实际进行的操作是 sign(keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)))，而 solidity 中 ecrecover 函数的第一个参数是真正被签名的数据，即需要在合约的 submitTransactionWithSignatures 函数中进行转换：
transactionHash = addTransaction(destination, value, data, nonce);
bytes memory prefix = "\x19Ethereum Signed Message:\n32";
bytes32 prefixedHash = sha3(prefix, transactionHash);
prefixedHash 也可在节点客户端计算出：
> prefix = "\x19Ethereum Signed Message:\n32";
"\x19Ethereum Signed Message:\n32"
> prefix = web3.toHex(prefix)
"0x19457468657265756d205369676e6564204d6573736167653a0a3332"
> web3.sha3(prefix + txHash.slice(2), {encoding : "hex"})
"0xdffc185d39cf96dadf4a067c541a03d57155c81bd166fe22a4aee33d13bbad0b"
关于 solidity 中 ecrecover 与 web3.eth.sign 使用问题可参考 Use solidity ecrecover with signature calculated with eth_sign
下面看这样一个问题：
A、B、C 拥有一个 2-of-3 的钱包 W1；
A、B、D 拥有一个 2-of-3 的钱包 W2；
A、B 决定通过 W1 使用
submitTransactionWithSignatures函数向 E 转一笔以太币，参数中包含了 A、B 对四元组转账交易的签名；则 A、B 或者 D 均可通过上述交易触发 W2 转账给 E，而无需任意其它两者的同意，形成重放攻击。
可修改 submitTransactionWithSignatures 如下来避免这个问题：
function submitTransactionWithSignatures(address destination, uint value, bytes data, uint nonce, uint8[] v, bytes32[] rs)
external
returns (bytes32 transactionHash)
{
transactionHash = addTransaction(destination, value, data, nonce);
bytes memory prefix = "\x19Ethereum Signed Message:\n32";
bytes32 prefixedHash = sha3(prefix, this, transactionHash);
confirmTransactionWithSignatures(transactionHash, prefixedHash, v, rs);
}
在 prefixedHash 中添加了 this， 即该合约的地址，在 console 中签名时，将合约地址追加进去，即：
> multiSigContractAddress = "0x9f94a748d21961f9dafc96274834793e16a4fac0"
"0x9f94a748d21961f9dafc96274834793e16a4fac0"
> personal.unlockAccount(eth.coinbase)
Unlock account 0xa3ac96fbe4b0dce5f6f89a715ca00934d68f6c37
Passphrase:
true
> web3.eth.sign(eth.coinbase, multiSigContractAddress + txHash.slice(2, 66))
"0xe7df062a2877a7805dd81256b6e1aa5ba7c4737b262c06197a58ced9b9099a786493ee088622365b5570142863ac2b8140720faf7bb81b21ca7906113169936d1c"
由于合约地址不同，可避免重放攻击问题。