derive publickey from seed phrase - this script derives the pubkey stored in the db from the seed phrase backup without revealing any private or confidential info

derive-pubkey.cjs

// From the terminal in the save directory where this script is saved:
// npm i bip39 bip32 @bitcoinerlab/secp256k1
// MNEMONIC="your mnemonic here" node derive-pubkey.cjs

const bip39 = require('bip39')
const BIP32Factory = require('bip32').default
const ecc = require('@bitcoinerlab/secp256k1')

const bip32 = BIP32Factory(ecc)

function derivePublicKeyHexFromMnemonic(
  mnemonic,
  derivationPath = `m/46'/0'/0'/0`
) {
  if (!bip39.validateMnemonic(mnemonic)) {
    throw new Error('Invalid BIP39 mnemonic')
  }

  const seed = bip39.mnemonicToSeedSync(mnemonic)
  const root = bip32.fromSeed(seed)
  const child = root.derivePath(derivationPath)

  return child.publicKey.toString('hex')
}

// example usage
const mnemonic = process.env.MNEMONIC
if (!mnemonic) throw new Error('Set MNEMONIC env var')

console.log(derivePublicKeyHexFromMnemonic(mnemonic))