Now we need cameras that watermark (using steganography) original videos so they can be authenticated and a blockchain solution for registering originals. Video sharing sites will need to process all their uploads to check for modifications and serve the original file (not re-encoded) as well, for third party checking.
What triggered you to downvote me? Maybe the fact that I used the dirty word 'blockchain'? I just used it because it seems like an obvious application to certify and long-term preserve the originals.
