0fuz

import {ethers, providers, Wallet} from "ethers";
import {FlashbotsBundleProvider, FlashbotsBundleResolution} from "@flashbots/ethers-provider-bundle";
import {parseUnits} from "ethers/lib/utils";

export async function timeout(ms: number) {
    return new Promise(res => setTimeout(res, ms))
}

const polygonRpc = 'https://rpc.ankr.com/polygon'
const privateKey = '0x123123...'

0fuz

Positive

• ~40GB space needed for state
• Actual X,P,C chains state for recent 100blocks.
• Really cheap (~30$) to start own state-sync-node compared to BSC full-node (700$+).

Negative

• Pending transactions is rare event. ~1-10% pending txes will be catched.
• Not enough to become validator

System requirements:

0fuz

import (
	"context"
	"crypto/ecdsa"
	"crypto/elliptic"
	"encoding/json"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethclient"
	"github.com/ethereum/go-ethereum/log"
	"io/ioutil"

0fuz

npm init -y
npm i ethers

Set provider

let provider = new ethers.providers.JsonRpcProvider("https://bscrpc.com", 56) // bsc
// let provider = new ethers.providers.WebSocketProvider("wss://..........", 56) // bsc

0fuz

1. Create an EC2 instance for snapshot downloading
   • Depending of cpu cores, uncompress faster
   • Estimate instance costs there: https://aws.amazon.com/ru/ec2/pricing/on-demand/
   • Connect ssh -i key.pem ubuntu@1.2.3.4
2. Create and attach EC2 volume gp3, min 1.5tb, better 2tb, 8000 IOPS, 250MB/s
   • Estimate GB size and costs https://calculator.aws/#/createCalculator/EBS
   • Attach volume to low-cost instance
3. Prepare attached volume to usage:
   • Based on this guide https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-using-volumes.html
   • Short steps to do are: