１．ropsten での送金テスト code

２．code

"use strict";

const Web3 = require('web3')
const web3 = new Web3('https://ropsten.infura.io/v3/xxxxxxxxxxxxxxxxxxxxxxxxx')
const { eth } = web3;
const Tx      = require('ethereumjs-tx').Transaction;

(async() => {

    const sellerAddr = 'seller adder'
    const buyerAddr = 'buyer adder'

    const sellerPrivateKey = 'seller privatekey'
    const buyerPrivateKey = 'buyer privatekey'


    const count = await eth.getTransactionCount(buyerAddr);
    console.log("count="+count);
    const nonce = ""+web3.utils.toHex(count);

    const gasPrice = await eth.getGasPrice()
    console.log("gasPrice"+gasPrice)

    const sellerBalanceStart = await eth.getBalance(sellerAddr);
    const buyerBalanceStart = await eth.getBalance(buyerAddr);

    console.log("Before Balance");
    console.log("seller = "+sellerBalanceStart);
    console.log("buyer  = "+buyerBalanceStart);

    const transactionObj = {
        nonce   : nonce,
        chainId : 3,
        gasPrice: web3.utils.toHex(gasPrice),
        gasLimit: '0x27100',
        to: sellerAddr,
        value: web3.utils.toHex(1*1000000000),
        timeout : web3.utils.toHex(5000)
    }

    const privateKeyBUF = Buffer.from(buyerPrivateKey, 'hex');

    const  tx = new Tx ( transactionObj , { chain: 'ropsten' });
    tx.sign(privateKeyBUF);

    const serializedTx = tx.serialize();
    const serializedTx_hex = '0x' + serializedTx.toString('hex');

    const transaction = await eth.sendSignedTransaction(serializedTx_hex);
    console.log(transaction);

    const sellerBalanceEnd = await eth.getBalance(sellerAddr);
    const buyerBalanceEnd = await eth.getBalance(buyerAddr);

    console.log("After Balance");
    console.log("seller = "+sellerBalanceEnd);
    console.log("buyer  = "+buyerBalanceEnd);

    //await eth.getPendingTransactions().then(console.log);
    var subscription = web3.eth.subscribe('pendingTransactions', function(error, result){
    if (!error)
        console.log(result);
    }) .on("data", function(transaction){
    console.log(transaction);
    });

})();