Before you treat a "Physical AI" capture as ground truth, check three things. 1. What was fingerprinted at record time. On Vangrid, every capture gets a content hash, a coarse geohash, and a timestamp as it is filmed, not after the fact (@vangrid_io docs). 2. What the chain actually proves. Fingerprints are batched into a Merkle tree and the root is attested on Base about every 15 minutes. That proves existence, ordering, and integrity. The same docs say it does not, by itself, prove the scene is what it claims to be. 3. Which layers are still off. Device attestation, sensor cross correlation, and collateralized independent review are documented as not live yet. Until they ship, a well formed fake can still pass the live checks.