You could add a button and only generate a QR code if someone presses that butto... | Hacker News

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		wartijn_ on Sept 15, 2022 \| parent \| context \| favorite \| on: How a QR code works You could add a button and only generate a QR code if someone presses that button.

shard on Sept 15, 2022 [–]

Or add a backlight to a transparent QR code which turns on when you press a button. This way a simple sticker over the QR code wouldn't work.

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