Seed phrase extensionSeed extension is the process of adding more words to the existing seed phrase to strengthen the security of a crypto wallet. This is done while creating a new wallet.
Reserved extension seed phrase:
-BIP39 seed wordlist-
Take note that the extension doesn't have to be a word from BIP39 wordlist.
It can be any word, phrase or even symbols, the "
Seed Phrase Extension" is actually a passphrase aka. "
BIP39 Passphrase".