I have the solution!
Rather than putting a QR code on the poster, put the actual URL there, so it's obvious when it's a spam URL.
And then let phones use OCR to visit the URL!
Then both the human and their phone can read it.
Rather than putting a QR code on the poster, put the actual URL there, so it's obvious when it's a spam URL.
And then let phones use OCR to visit the URL!
Then both the human and their phone can read it.