Bip39 hardware https://www.storeboard.com/blogs/ai-for-small-business/browsing-the-globe-of-bitcoin-addresses-the-value-of-bip39/6240727 BIP85: A more recent proposal enabling the deterministic derivation of multiple BIP39 mnemonic seeds from the master seed. For words that only have 3 letters, there isn't any 4th letter. As an example With all the word “insert”, there are no extra le... https://bookmarkassist.com/story20697753/bip39-balance-checker-indicators-on-bip39-standard-you-should-know-https-linktr-ee-bip39