On-device camera app.

Can you tell which one changed?

Your eyes have to guess. FactLockCam compares against the earlier anchored record.

Verifies the exact file and signed record—not the physical truth of the scene.

Step 01 · Pick the changed copy

Real photo · one copy has one pixel changed

Choose which copy you think changed. Then run the shipping verifier.

Next step

Anchor your own original.

The challenge above is the whole product in miniature: an earlier record, a later copy, and a comparison anyone can run.