Bip39 Passphrase. Now, at the next stage we use these getting and change critical bunch to deliver specific non-public keys. Use the above generate non-public keys and chain code and go them to the above mentioned pointed out function kchild = kpar + hash(Kpar, cpar, i) to create person keys. https://freebookmarkpost.com/story19015685/bip39-https-linktr-ee-bip39-5-simple-statements-about-bip39-mnemonic-explained