Bip39 Checksum. Now, at another stage we use these receiving and alter key bunch to generate unique personal keys. Use the above make private keys and chain code and move them to the above mentioned pointed out functionality kchild = kpar + hash(Kpar, cpar, i) to create unique keys. Just https://7prbookmarks.com/story18785187/bip39-mnemonic-https-linktr-ee-bip39-bip39-generator-an-overview