I have posted regarding Proof, a blockchain live stream hosting and storage service to surveil 'public servants' to ensure they are earning their pay, instead of selling us down the river.

Given the nascent technology to alter video and insert words and actions (just like managing avatars in a video game) video is losing is utility as evidence. Blockchain and timestamps can fix the problem, and at least mitigate it, even after the ability to produce fake video in real time is attained. It will remain expensive and require preparation in advance to do, and most surveillance video will be free of that taint for some time yet.