# Install library web3
pip install web3

# Contoh cek balance ETH
from web3 import Web3
w3 = Web3(Web3.HTTPProvider('https://mainnet.infura.io/v3/YOUR_KEY'))
balance = w3.eth.get_balance('0xYOUR_ADDRESS')
print(w3.from_wei(balance, 'ether'))

// Cek balance dengan ethers.js
import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://mainnet.infura.io/v3/KEY');
const balance = await provider.getBalance('0xYOUR_ADDRESS');
console.log(ethers.formatEther(balance), 'ETH');

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract SimpleToken {
  string public name = "MyToken";
  mapping(address => uint256) public balanceOf;

  function transfer(address to, uint256 amount) public {
    balanceOf[msg.sender] -= amount;
    balanceOf[to] += amount;
  }
}

# Konek ke VPS
ssh root@IP_VPS_KAMU

# Update sistem Ubuntu
apt update && apt upgrade -y

# Jalankan script di background (tetap jalan saat SSH tutup)
screen -S nama_session
# ... jalankan program kamu di sini ...
# Ctrl+A lalu D untuk detach (keluar tanpa stop)

# Kembali ke session yang berjalan
screen -r nama_session

# Lihat semua session aktif
screen -ls

pwd # Tampilkan direktori saat ini
ls # List file di folder
ls -la # List lengkap + file tersembunyi
cd /path # Pindah ke direktori
cd .. # Naik satu level ke atas
cd ~ # Ke home directory
mkdir nama # Buat folder baru
rm -rf nama # Hapus folder (⚠️ hati-hati, permanen)

cat file.txt # Tampilkan isi file
nano file.txt # Edit file (text editor sederhana)
cp source dest # Copy file
mv source dest # Pindah/rename file
chmod +x script.sh # Beri izin eksekusi ke script
chown user:group file # Ganti kepemilikan file

ps aux # Lihat semua proses berjalan
top / htop # Monitor CPU & RAM real-time
kill PID # Hentikan proses by ID
pkill nama_proses # Hentikan proses by nama
nohup cmd & # Jalankan di background
jobs # Lihat background jobs

curl https://url.com # HTTP request
wget https://url.com/file # Download file
ping google.com # Test koneksi
netstat -tulpn # Lihat port yang terbuka
ufw status # Status firewall
ufw allow 8080 # Buka port 8080

crontab -e # Buka cron editor

# Format: menit jam hari bulan hari_minggu perintah
0 * * * * /usr/bin/python3 /home/bot/script.py # Setiap jam
0 0 * * * /bin/bash /home/backup.sh # Setiap tengah malam
*/5 * * * * curl https://api.example.com/ping # Setiap 5 menit

# Install Git (Ubuntu)
apt install git

# Konfigurasi identitas (wajib sekali)
git config --global user.name "Nama Kamu"
git config --global user.email "email@kamu.com"

# Clone repo dari GitHub ke VPS/laptop
git clone https://github.com/user/repo.git

# Lihat status perubahan
git status

# Stage perubahan
git add . # Semua file
git add file.txt # File spesifik

# Commit (simpan snapshot)
git commit -m "Pesan perubahan kamu"

# Push ke GitHub
git push origin main

# Pull update terbaru dari GitHub
git pull origin main

git branch # Lihat semua branch
git checkout -b fitur-baru # Buat & pindah ke branch baru
git checkout main # Kembali ke branch main
git merge fitur-baru # Gabung branch ke main
git branch -d fitur-baru # Hapus branch

# Install via NVM (Node Version Manager) — direkomendasikan
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
source ~/.bashrc

# Install Node.js versi terbaru LTS
nvm install --lts
nvm use --lts

# Verifikasi instalasi
node --version
npm --version

# Inisialisasi project baru
npm init -y

# Install package
npm install ethers # Install ethers.js
npm install -g pm2 # Install global (pm2 process manager)

# Jalankan script
node index.js
npm run start # Jalankan script dari package.json

# Lihat semua package terinstall
npm list

npm install -g pm2

pm2 start index.js --name "bot-saya" # Jalankan bot
pm2 list # Lihat semua proses
pm2 logs bot-saya # Lihat log real-time
pm2 restart bot-saya # Restart bot
pm2 stop bot-saya # Stop bot
pm2 startup # Auto-start saat VPS reboot
pm2 save # Simpan konfigurasi

# Install Docker
curl -fsSL https://get.docker.com -o get-docker.sh
sh get-docker.sh

# Jalankan Docker tanpa sudo (opsional)
usermod -aG docker $USER
newgrp docker

# Verifikasi
docker --version

# Pull image dari Docker Hub
docker pull node:20

# Jalankan container
docker run -d --name bot-saya node:20 node /app/index.js

# Lihat container berjalan
docker ps

# Lihat log container
docker logs bot-saya

# Stop & hapus container
docker stop bot-saya && docker rm bot-saya

# Lihat semua image tersimpan
docker images

# Contoh Dockerfile untuk bot Node.js
FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
CMD ["node", "index.js"]

# Build image
docker build -t bot-saya .

# Jalankan image
docker run -d --name bot bot-saya

# docker-compose.yml
version: '3.8'
services:
  bot:
    build: .
    restart: always
    env_file: .env
  db:
    image: postgres:15
    environment:
      POSTGRES_PASSWORD: secret

# Jalankan semua service
docker compose up -d

-- Buat tabel
CREATE TABLE airdrops (
  id SERIAL PRIMARY KEY,
  name TEXT NOT NULL,
  status TEXT DEFAULT 'active',
  created_at TIMESTAMP DEFAULT NOW()
);

-- Insert data
INSERT INTO airdrops (name, status) VALUES ('LayerZero', 'active');

-- Query data
SELECT * FROM airdrops WHERE status = 'active' ORDER BY created_at DESC;

-- Update data
UPDATE airdrops SET status = 'listed' WHERE name = 'LayerZero';

-- Hapus data
DELETE FROM airdrops WHERE id = 1;

// Fetch harga ETH dari CoinGecko API (JavaScript)
const res = await fetch('https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd');
const data = await res.json();
console.log('ETH Price: $' + data.ethereum.usd);

# Fetch balance dari Etherscan API (Python)
import requests
url = f'https://api.etherscan.io/api?module=account&action=balance&address=0xADDRESS&apikey=KEY'
r = requests.get(url).json()
print(int(r['result']) / 1e18, 'ETH')

# Python — Telegram Bot sederhana dengan python-telegram-bot
pip install python-telegram-bot

from telegram import Bot
import asyncio

async def kirim_alert():
  bot = Bot(token="TOKEN_BOT_KAMU")
  await bot.send_message(
    chat_id="CHAT_ID_KAMU",
    text="🚨 Alert: Airdrop baru terdeteksi!"
  )

asyncio.run(kirim_alert())

// JavaScript — Auto claim reward dari contract
import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider(RPC_URL);
const wallet = new ethers.Wallet(PRIVATE_KEY, provider);
const contract = new ethers.Contract(CONTRACT_ADDR, ABI, wallet);

// Claim reward
const tx = await contract.claimReward();
await tx.wait();
console.log('Claimed! TX:', tx.hash);