Bip39 Checksum. Now, at the following level we use these getting and change key bunch to generate unique non-public keys. Use the above mentioned produce personal keys and chain code and pass them to the above outlined function kchild = kpar + hash(Kpar, cpar, i) to deliver unique keys. Just https://livebackpage.com/story4561480/ian-coleman-bip39-https-linktr-ee-bip39-bip39-wallets-things-to-know-before-you-buy