nostr:npub1yx6pjypd4r7qh2gysjhvjd9l2km6hnm4amdnjyjw3467fy05rf0qfp7kza

nostr:npub12r0yjt8723ey2r035qtklhmdj90f0j6an7xnan8005jl7z5gw80qat9qrx

Apart from paper back up of qr and no source code this concept seems interesting.

https://youtu.be/12y-fOmyjHA