This guide explores the passphrase feature: what it does, why advanced users rely on it, how to create recoverable yet secure passphrases, and the dangers of mismanaging them.
Technically it's an extra word or phrase appended to your seed that produces a different wallet. Without the passphrase the wallet cannot be restored. This makes it suitable for creating hidden or additional accounts that are protected even if your seed is exposed.
Use a memorable pattern you can reliably reproduce, or use a passphrase stored in a physical secure location. Avoid relying on ephemeral memory alone when large sums are at risk. Consider storing a hint in a separate secure place rather than the passphrase itself.
Test the passphrase by restoring to a different device (or a software wallet with correct import features) and confirm the expected wallet appears. Do this with small amounts to validate your operational plan.