Exactly. Use blockchain to trace image/video origins - ie media data plus camera signature and camera operator id with timestamps, and track the sources through every edit, along with edit transform info and editor id. That way any produced clip can be traced back to origins through all edits and then verified to particular real sources. A provable chain of custody of every image. If a video clip came from a trusted known camera operator and stays under the control of entities you trust, you can trust the video. If any links in the ownership or edits are sus, an author can track down and produce the in/out of any edit link to prove the authenticity.