01
Lock light
Seal at capture. Chip binds the picture before anyone can swap frames.
Cave Check
Prove the clip came from the world.
Clip from world. Fake no pass.
Caveman Phone locks the picture when light hits the chip, marks it with a sky witness, and publishes a small proof pack called a Rock. Anyone can open Cave Check and see pass or fail — no account.
02
Mark sky
Sky radio leaves a hard-to-fake fingerprint for time and place.
03
Kick Rock
Paste the Rock or drop the clip. Cave Check stamps PASS or FAIL.