Bip39 Checksum. Now, at the next degree we use these obtaining and change vital bunch to make unique private keys. Use the above create personal keys and chain code and move them to the above mentioned outlined purpose kchild = kpar + hash(Kpar, cpar, i) to crank out unique keys. https://bookmarks-hit.com/story20034870/bip39-mnemonic-https-linktr-ee-bip39-bip39-wallet-fundamentals-explained