![Crash [800x432 - 41KB]](https://pic8.co/sh/qlQVyD.jpg){kind=link}
No, the system will not crash, and a single dot may not be enough to foul up the error correction built into the QR format. A large blotch would do it though. Get one of those bigger sharpies.
This. If you are going to create a meme, at least create one that's accurate. QR codes have error correction. One dot likely won't do jack squat.
Ok, so how does the error correction work? Is the qr code simply mirrored left right, and up down? Then all you have to do is add the same dot in two copies of the code.
The code includes a variant of what's called "trellis encoding" IIRC Reed-Solomon encoding, which allows for a certain number of random bits to be misread but still corrected. It's pretty robust and allows for camera issues as well. A few small dots, unless they're in the exact right spots, will probably be corrected.
You might consider experimenting a little using QR codes and your phone, seeing how much you'd have to corrupt it in order to break the scanning.
It has to be discrete so people can't easily tell that it was defaced. But once the right pattern is figured out you could easily create a stencil to quickly place the dots in the right spots. As long as they are all roughly the same size.
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