Bip39 Seed. Now, at the following degree we use these receiving and change key bunch to crank out person non-public keys. Use the above crank out private keys and chain code and go them to the above outlined operate kchild = kpar + hash(Kpar, cpar, i) to generate specific keys. https://thekiwisocial.com/story4520641/bip39-passphrase-https-linktr-ee-bip39-the-bip39-wallet-diaries