Bip39 Checksum. Also, BIP39 defines the passphrase solution, that adds a reasonable quantity of additive defense in the event that your seed phrase is stolen or if not accidentally exposed. Having said that, What's more, it provides some threat, so it is suggested for more skilled people. BIP32 and BIP44 https://directoryarmy.com/listings13032609/bip39-https-linktr-ee-bip39-the-greatest-guide-to-bip39-list