Dabs when you go to Vegas is it provably fair? I doubt it you can give a client seed to the dealer
But this is bitcoin world. So it must be provably fair (or whatever it was called back then before the term got invented). That is the "real" world, so they are auditably fair (audited by whoever accounting company and games/gambling commission).
They are also cheat proof, and almost cheat proof, because if they suspect you of cheating even if they can't prove it, the bouncers kick you out.
Their vaults are also theft-proof except to Ocean's Eleven. Bitcoin "vaults" which are in cold storage are not in the same world (network).
Anyway, I'm thinking too much.
I'm thinking 2 decks, because she doesn't have the physical 6 or 8 decks of cards.