Bip39 Seed. Now, at another level we use these getting and alter important bunch to make personal personal keys. Use the above mentioned crank out non-public keys and chain code and pass them to the above pointed out function kchild = kpar + hash(Kpar, cpar, i) to produce personal keys. https://thefairlist.com/story9471986/bip39-generator-https-linktr-ee-bip39-the-fact-about-bip39-wallets-that-no-one-is-suggesting