Loading private key

import { Keypair } from "@solana/web3.js"
import * as bs58 from "bs58"
 
const keypair = Keypair.fromSecretKey(
  bs58.decode(
    "5MaiiCavjCmn9Hs1o3eznqDEhRwxo7pXiAYez7keQUviUkauRiTMD8DrESdrNjN8zd9mTmVhRvBJeg5vhyvgrAhG",
  ),
)