All the wallet recovery phrases are generated from the BIP39 wordlist. This alphabetical list contains 2048 words, with each of them having its own number. Instead of letters and words, KeyTag smartly help users to record the number of each recovery phrase. Onekey Tag is compatible with any BIP39 seed phrase; not just Onekey's. Each KeyTag has one extra row for passphrases. Have fun with the dot-punching game.