Passphrase is an advanced feature of the SafePal wallet which allows users to create hidden wallets. Passphrases serve as a function of second-factor protection of the mnemonic phrase and are ultimate protection against attacks involving physical access to the wallet or the mnemonic phrase.
Passphrase is an optional feature. Your usage experience won’t be affected if you don’t activate this feature. Users are free to choose whether they prefer to activate and set a passphrase.
If you want to create derivative wallet accounts under the mnemonic phrase, you can choose to activate the Passphrase feature and set it up.
Because the Passphrase is not stored anywhere on the SafePal wallet, once you lose or forget the Passphrase, it will result in permanent loss of your assets stored under that Passphrase. No one can help to retrieve your assets back.
It can only be found by guessing (brute-forcing) which is often technologically and economically infeasible.
So please remember your Passphrase tightly. We recommend to keep it in mind rather than in any physical format. If you have to write it on a paper, never keep it in the same place with the mnemonic phrase.
There are various approaches to creating good Passphrase for your wallet.
You can go with something that is quick to type but not so easy to remember. Or you can opt for something that is easy to remember but needs to take longer and complex to enter. Another option is to make up a sequence of random words.
In short, it is the best setting a Passphrase that is easy to remember, but also long and random enough to provide a sufficient level of security.
At the end of the day, you know your security needs best. If physical attacks are in your threat model, then use a strong passphrase to protect your wallet. Even if someone gets physical access to your device and extracts the recovery seed, they still absolutely will not be able to break through a strong passphrase.