16. COLDCARD Passphrase (BIP39) features. Using it, Locking it down, and encrypted MicroSD. 

Damn, I feel like a classy bitcoiner with this music.

Wish these tutorials had some narration.

Can you store encrypted passphrases on a different SD card than you use for signing transactions? That way the SD card with the encrypted passphrases never touches a computer. This would require hot swapping SD cards unless you do seed lock down.

So if you do not create a passpharase by default your coldcard is essentially one wallet with a passphrase that is an empty string

So the seed lockdown is mostly for convenience, right? so you don't have to keep entering the password in every time you use the cold card. The downside is if someone can bypass/crack the pin, which has been done before, they have access to your funds. If you don't do a seed lockdown and they break through or bypass the pin they would still need to know the password to sign transactions. Tradeoffs are tough for self custody :( I initially though multi sig was too complicated, but now I am wondering whether its the safest way to do things.

What's the point of seed lockdown?