Frage zur Verwendung einer Passphrase

25th

25th word, but the key will still have the same amount of bits and could possibly be represented by another 24 words (but possibly with a different derivation path).

AFAIK, most protocols don’t need 24 words, 12 is all the seed data neeeded. 24 on Trezor One had some legacy reason, where restoring the passphrase went through the computer it was connected to.

If you REALLY want to get technical, EVERY passphrase already has a 25th (or 13th or whatever) word. When you set a passphrase, you are actually modifying that 25th word, not adding a 25th word.

When you do not use a passphrase, the 25th word still exists, but it is set to the default string „mnemonic“. You would never actually type that in, because it is added by the internal logic automatically.

If you DO use a passphrase (for example, „bob“, the 25th word internally is „mnemonicbob“.

So, that extra word is always there, even if you don’t use it. It’s just that every implementation knows how to add that default string of „mnemonic“ to the beginning of the word so you don’t even realize it’s being used.

It’s functionality the same as having a different seed in that you have a totally different set of accounts. Your passphrase isn’t part of the 24 words, if you ever restore the seed them you still restore the seed words as normal, then enter the passphrase separately.