Bip39 Checksum. Now, at another level we use these receiving and change important bunch to create unique private keys. Use the above mentioned crank out non-public keys and chain code and pass them to the above mentioned perform kchild = kpar + hash(Kpar, cpar, i) to make particular person keys. https://rotatesites.com/story20942145/bip39-wallet-https-linktr-ee-bip39-what-does-ian-coleman-bip39-mean