I hope it stays private just like physical cash because with these QR codes you could add some programmability and traceability to these notes.
As far as I understand by reading the article, the visible and open QR code would just verify that the note is real.
This solution would at least eliminate the problem of getting rid of your change as a tourist at the end of your trips by scratching and redeeming the notes to your digital wallet (hopefully with a BTC integration), and without having to use the airport exchanger booths with their vulturous spreads.
I hope it stays private just like physical cash because with these QR codes you could add some programmability and traceability to these notes.
As far as I understand by reading the article, the visible and open QR code would just verify that the note is real.
This solution would at least eliminate the problem of getting rid of your change as a tourist at the end of your trips by scratching and redeeming the notes to your digital wallet (hopefully with a BTC integration), and without having to use the airport exchanger booths with their vulturous spreads.