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What proof is there that the photo scanner is scanning a genuine photo and not something AI generated that looks like a Polaroid?

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What proof is there that this camera is photographing a genuine scene?

https://en.wikipedia.org/wiki/Cottingley_Fairies

If Elsie and Frances had the technology we could have a digitally signed zero knowledge proof that their photo's captured a genuine scene that included cardboard cutouts of fairies.

It was a real moment with objects that Bishop Berkeley could have kicked.

Recalling an old scandal about an office copier/scanner which was doing some OCR cleanup and changing numbers.

https://news.ycombinator.com/item?id=6156238 (2013)

Interestingly it wasn't the OCR that was the problem but the JBIG2 compression.

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