Bip39 Seed. Now, at the subsequent level we use these obtaining and change key bunch to generate individual personal keys. Use the above mentioned generate personal keys and chain code and go them to the above pointed out functionality kchild = kpar + hash(Kpar, cpar, i) to create unique keys. https://webnowmedia.com/story4132751/bip39-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic