Leica has implemented something in this vein with encrypted capture metadata embedded in the file, but there are a lot of baked in vulnerabilities when you keep your validation record on the file itself.
Can you do this in a modern DSLR? I just watched a video about a photographer shooting out in the wilderness with a new camera that shoots 40 fps. Can your support such high speeds and batch-processing the uploads once they return to civilization without undue burden on the photographer?