[QuadrupleA]

Wouldn't printing a QR code be way easier? If it's just for retro fun / Rube Goldberginess than nevermind, carry on :)

[econ]

It needs a new kind of punch that can't easily be photographed and it needs to be waterproof. Magnets seem good. Could make them disc shaped.... wait...

[ciprian_craciun]

Please see my reply to this other similar question:

> Looks like a new 2d barcode format to me. Why I would want this rather QR or any other that have redundancy built in?

https://news.ycombinator.com/item?id=44145202#44145279

[ThrowawayTestr]

This will survive a house fire.