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Great idea, thanks for sharing this! But how could we prove what's behind the image is exactly what is shown? Could someone still hack it, pretend to be a normal link but actually is a phishing link?

How can you know the URL doesn't redirect to something malicious?

The big downside of this is lack of redundancy. QR codes are incredibly redundant. check out images 6 ("lose an edge") and 10 ("blob of paint") in the page: http://datagenetics.com/blog/november12013/index.html

Both of these scan perfectly fine with QR. And in HR, those (and most of other damaged examples) would be unreadable.

you can also use cash.