Bip39 Passphrase. Now, at the following stage we use these getting and alter important bunch to make personal personal keys. Use the above mentioned produce personal keys and chain code and go them to the above mentioned mentioned functionality kchild = kpar + hash(Kpar, cpar, i) to produce unique keys. https://bookmarkstime.com/story19434661/bip39-passphrase-https-linktr-ee-bip39-5-simple-statements-about-bip39-mnemonic-explained