Bip39 Seed. Now, at the next level we use these receiving and alter crucial bunch to deliver individual non-public keys. Use the above mentioned make non-public keys and chain code and go them to the above mentioned described functionality kchild = kpar + hash(Kpar, cpar, i) to make unique keys. https://bookmarksknot.com/story20439125/ian-coleman-bip39-https-linktr-ee-bip39-the-best-side-of-bip39