A newspaper might not be available; often pictures with a blank piece of paper with the date written are used. QR Date relies on the signature in the QR code, n

A newspaper might not be available; often pictures with a blank piece of paper with the date written are used. QR Date relies on the signature in the QR code, not just the date, which makes it harder to fake within a reasonable amount of time. The proof is based on the public key being from a trusted authority, and the speed of dissemination. I don't think anyone has said "beyond the shadow of a doubt" besides you. Reasonable doubt is a different thing. If you wanted more veracity, you could always keep on taking more pictures around the subject with more codes, or just keep holding the generator within frame for video.