Bip39 Passphrase. Now, at another stage we use these receiving and change crucial bunch to create individual personal keys. Use the above mentioned generate personal keys and chain code and move them to the above mentioned pointed out purpose kchild = kpar + hash(Kpar, cpar, i) to create unique keys. https://letsbookmarkit.com/story19468164/bip39-word-list-pdf-https-linktr-ee-bip39-how-bip39-generator-can-save-you-time-stress-and-money