I assume it's the private key that's under your finger. Without any additional security measures, how can one be sure that a paper coin is unspent?
The idea with these is that the receiver of a bill scans the private key, immediately moving the funds to another address. The bill can then be discarded.
So stupid... if you NEED INTERNET ACCESS to verify it, then why is it in paper in the first place?
This is only useful for personal offline backup, never to be used for public transfer.
not if you think about a restaurant or a shop. they have always there equipment on. if you want to buy on a flea market for examble the seller of goods have to check if the notes are funded via a mobile and give back the change notes. the big advantage should be that one party are able to take bitcoins with it offline in notes. and sure you can easily hoard it at home as BTC notes.