Gnosis safe多签交易可以到官网去在线构造，但有时候不想在官网进行操作，或者为了规避官网的故障，可以自己在本地构造交易脚本，直接去多签合约交互，以达到多签钱包交易的目的。

首先要明确的是多签钱包实际是一个智能合约，里面存储了owner地址，多签达标门槛数等信息，当要触发某个交易时，比较简单的实现方式可以是每个owner都发出一笔交易，直到达到达标数量后，在最后一笔交易时去触发实际的多签钱包交易，但这种方式会多消耗owner钱包的gas费，而且也不那么优雅。Gnosis safe用了EIP712的方式，owner先签名交易，当达到达标门槛后，再把签名拼接在一起，执行一次交易在合约里验证签名去触发实际交易。

const domain = {
    chainId: process.env.CHAIN_ID,//链ID
    verifyingContract: process.env.VERIFY_CONTRACT//多签合约地址
};
const types = {    
    SafeTx: [
        { type: "address", name: "to" },
        { type: "uint256", name: "value" },
        { type: "bytes", name: "data" },
        { type: "uint8", name: "operation" },
        { type: "uint256", name: "safeTxGas" },
        { type: "uint256", name: "baseGas" },
        { type: "uint256", name: "gasPrice" },
        { type: "address", name: "gasToken" },
        { type: "address", name: "refundReceiver" },
        { type: "uint256", name: "nonce" },
    ]
}
let nonce=await provider.call({
    to: process.env.VERIFY_CONTRACT,
    data: ethers.utils.keccak256(ethers.utils.toUtf8Bytes("nonce()")).slice(0,10)
    });//获取多签钱包的nonce值，防止重放攻击

//The data to sign
const value = {
    to:"",//实际交易的to地址
    value:,//实际交易的value值
    data:"",//实际交易的data
    operation:0,
    safeTxGas:0,
    baseGas:0,
    gasPrice:0,
    gasToken:"0x0000000000000000000000000000000000000000",
    refundReceiver:"0x0000000000000000000000000000000000000000",
    nonce:ethers.BigNumber.from(nonce).toNumber()
};
//假设owner的钱包是w1,w2,w3，以下对交易进行签名
let signature1 = await w1._signTypedData(domain, types, value);
let signature2 = await w2._signTypedData(domain, types, value);
let signature3 = await w3._signTypedData(domain, types, value);
const sig=signature1+signature2.slice(2)+signature3.slice(2);//要按钱包地址从小到大的顺序拼接地址生成的签名串，这里假设w1<w2<w3
const data=ethers.utils.defaultAbiCoder.encode([ "address", "uint256","bytes","uint8", "uint256", "uint256", "uint256" ,"address","address","bytes"], 
    [ value.to,value.value,value.data,value.operation,value.safeTxGas,value.baseGas,value.gasPrice,value.gasToken,value.refundReceiver,sig]);//构造execTransaction参数串
let tran={
    to:process.env.VERIFY_CONTRACT,       
    data:"0x6a761202"+data.slice(2)   
};
//用任意钱包地址对tran发出交易即可