Bear in mind if you are creating any sort of hash from an original data source, even a very small change has a radically different outcome for a hash algorithm.

Bear in mind if you are creating any sort of hash from an original data source, even a very small change has a radically different outcome for a hash algorithm. A nation-state may be able to spy on the lamps, but recreating the exact feed would be much harder, which is what you'd need to do anything useful there... it'd be far simpler to hack the camera feed.