Hackers take down Vaccine ID system in Brazil
(www.aa.com.tr)
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It reminds me of them baddies who add an extra dot or square to the Q/-. R code,s using a black sharpie! Someone said it screwed up the whole system and it wouldn't work, which is a shame ehh.
I tested this idea. QR code seems to have a lot of redundant squares. I couldn't make it fail.
Spray paint would do it
The point is to use a sharpie because you can control it very easily and at a glance no one would know.