> that image shared online is original and unedited?

The image data the sensor physically receives passes through a ton of processing steps before the image lands in your phone. If there is some watermarking/signature doing on, on the image, it'd be that the device at that moment capture that data, not that it's not AI, or not edited, or "truthful" or whatever. That's still an unsolved problem to figure out.

It is a very old idea. But it matters a lot in iPhone’s scale. Many people will have it without buying a separate device.

From what I understand, the feature renders a signed reference image from raw sensor-data "alongside the final image".

Still no solution if the image posted online is not that reference image or that reference image is actually a photo of an AI picture.

Isn’t that done by EXIF like decades ago? Not on phones but DSLR. I would think it’s an easy software thing to add (and probably to remove)

The underlying tech is already compromised on the Android side.

https://lobste.rs/s/4netv1/c2pa_cameras_do_not_survive_conta...