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I don't. I like to be able to transfer data from my PC to my phone via QR codes; print out QR codes pointing to the latest photo album and and give them to friends; finding QR links on "garage sale" signs (real thing that happened today).

Requiring signatures will likely kill those applications.

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It's incorrect to assume that the existence of signature validation would kill this use-case.

Similar to how the existence of HTTPS does not kill the ability to transmit data over HTTP and visit sites with no certificate or a non-trusted certificate.

It could be as simple as a pop-up saying, "this QR code is not validated, continue anyway"?

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