Bip39 Vs Slip39. The wallet handles the major lifting of converting the mnemonic words via a means of advanced hashing, salting, and checksum functions into a binary "seed," which happens to be then used to produce the all-crucial personal and general public encryption keys. BIP32 was the primary seed standard https://directory-2020.com/listings586196/bip39-checksum-https-linktr-ee-bip39-a-secret-weapon-for-bip39-mnemonic-generator