Bip39 wallet recovery https://www.storeboard.com/myrtierisaliti Checksum creation: A checksum is produced from this entropy working with SHA-256 hashing, which helps verify the mnemonic's integrity later on. For words that only have three letters, there's no 4th letter. Such as Together with the word “add”, there won't be any much more letters https://fatallisto.com/story10432368/bip39-wiki-a-secret-weapon-for-bip39-mnemonic-code-converter-tool-https-cutt-ly-uryc5rw7