Bip39 hardware https://telegra.ph/Producing-Custom-Bitcoin-Addresses-A-Take-A-Look-At-BIP39-Strategies-06-28 BIP85: A more moderen proposal allowing for the deterministic derivation of numerous BIP39 mnemonic seeds from a grasp seed. For words that only have 3 letters, there isn't a 4th letter. One example is While using the word “add”, there won't be any a lot more letters https://throbsocial.com/story21817980/bip39-word-list-generator-the-smart-trick-of-bip39-word-list-github-that-no-one-is-discussing-https-linktr-ee-bip39