Clarification about private key format in README.md

[codewiz]

From https://github.com/ava-labs/avalanche-smart-contract-quickstart#deploy-to-fuji-or-mainnet :

Deploy to Fuji or Mainnet

You need to add your private key to the accounts field in hardhat.config.js.

How do I extract a private key in the expected format? Private keys for the Fuji net are in the form PrivateKey-[a-zA-Z0-9]+, but hardhat expects hex-encoded Ethereum keys (0x[0-9A-F]+)

[cgcardona]

Our private keys are encoded as cb58. You can use AvalancheJS to convert cb58 to the hex string that you want. Here's a script

import { 
  BinTools,
  Buffer
} from "avalanche";
  
const main = async (): Promise<any> => {
  const bintools: BinTools = BinTools.getInstance()
  const privKey: string = "PrivateKey-ewoqjP7PxY4yr3iLTpLisriqt94hdyDFNgchSxGGztUrTXtNN"
  const decoded: Buffer = bintools.cb58Decode(privKey.split('-')[1])
  console.log(`0x${decoded.toString('hex')}`)
  // 0x56289e99c94b6912bfc12adc093c9b51124f0dc54ac7a766b2bc5ccf558d8027
  const cb58: string = bintools.cb58Encode(decoded)
  console.log(`PrivateKey-${cb58}`)
  // PrivateKey-ewoqjP7PxY4yr3iLTpLisriqt94hdyDFNgchSxGGztUrTXtNN
}

main()