Passphrase vs BIP39

Is the Password information in the Learn area of the Trezor website talking about the BIP39 protocol or is that something different?

It’s part of the BIP39 standard, see: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki#from-mnemonic-to-seed

A user may decide to protect their mnemonic with a passphrase. If a passphrase is not present, an empty string “” is used instead.

Hello @doclink0219,

In addition to PIN protection, there is also Passphrase feature enabled by default in Trezor Suite.

The passphrase works like an additional word to 12 or 24 words of your recovery seed that is not stored on your Trezor. When the passphrase feature is enabled, Trezor will ask you to enter the passphrase which will then be combined with the actual seed (12 or 24 words generated during Trezor setup) and a new unique seed will be created. We say that each particular passphrase will let you access a unique wallet hidden behind that passphrase.

This means:

  1. each unique passphrase will create a unique wallet with unique addresses

  2. if you already had some crypto stored on your Trezor before passphrase feature was enabled, then you can access your original wallet when entering an empty passphrase (in other words, when prompted for a passphrase, please don’t type any character and only hit the “Enter” button)

  3. the passphrase for the particular wallet cannot be changed or removed, but bitcoin (or other supported crypto) can be transferred between wallets with different passphrases via the standard transaction procedure

  4. the passphrase can be any word or any set of letters (in ASCII format and with 50 characters max) that you might use as a password, it is case-sensitive and empty space is also a valid character

  5. you typically would not write it down anywhere, to eliminate any possibility of it being discovered

  6. your passphrase should always be memorable as there’s no way to recover it, and your funds stored under a passphrase will be lost if you forget it (therefore please use it only if you completely understand its mechanics)

For additional information, please refer to our article about passphrases and hidden wallets: https://trezor.io/learn/a/passphrases-and-hidden-wallets
also to this blog post: https://blog.trezor.io/passphrase-the-ultimate-protection-for-your-accounts-3a311990925b

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