Bip39 Checksum. Now, at the following level we use these obtaining and change critical bunch to make individual personal keys. Use the above mentioned create private keys and chain code and move them to the above mentioned stated perform kchild = kpar + hash(Kpar, cpar, i) to produce unique keys. https://socialislife.com/story4368707/ian-coleman-bip39-https-linktr-ee-bip39-5-simple-statements-about-bip39-mnemonic-explained