Good concept I guess? The challenge is to make them easy and quick to transact. The problem with this is that before you actually accept the "banknotes" you need to scan them one by one to confirm that it actually does contain some btc.
Correct me if there's something I missed.
Yeah, I see this becoming a problem though. It would be interesting if a banknote could in a sense "self destruct". It's not very user friendly to have to scan each note and then having to dispose them. Outside of long term storage I don't see these being very logical as an application or other form of integration would be easier to use on a daily basis.