Bip39 Seed. Now, at the following degree we use these acquiring and change key bunch to generate specific private keys. Use the above create personal keys and chain code and go them to the above mentioned talked about functionality kchild = kpar + hash(Kpar, cpar, i) to create individual keys. https://webnowmedia.com/story4189402/bip39-wallets-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic