Bip39 cryptotag https://www.storeboard.com/blogs/ai-for-small-business/browsing-the-globe-of-bitcoin-addresses-the-value-of-bip39/6240727 D'CENT Biometric Wallet - A components wallet which has a biometric authentication characteristic, supporting BIP39 seed phrases and providing an additional layer of safety. For words that have only 3 letters, there is not any 4th letter. By way of ... https://www.anobii.com/en/01000289012ff9b293/profile/activity