This is what is in euro bills right?
Hand waiving a lot of the details, each note basically becomes a hardware wallet with some additional features to prevent double spending.
but its still has flaws imo and just makes it a novelty rather than something practical or useful, for example unless the vendor has change, you would have to spend your btc cash denomination as a whole or exchange it for fiat. what if both the vendor & customer didn't have internet access, how would they check if the cash hasn't been used? idk if you can write back to an rfid that may solve some problems
Luckily there are superior alt coins that don't have that flaw.
That should be the point where the intellectual curious hacker should try to broaden there horizon beyond the superficial surface.
I don't see the seedy nature you try to apply to a whole industry if anything i experience the opposite.
Is there any way I can use these as general-purpose HSMs outside of bitcoin/cryptocurrency contexts? Just as a novelty.
Let's say I just want to store a private key on it and use it for SSH/etc authentication - would that be possible?