It's X years in the future. We can create deep fakes that can't be distinguished from the Real Thing. Especially for videos of older quality. We have a corpus of historical videos. We temporarily live under an oppressive regime that rewrites history to fit its needs. The institutions that we trust to attest to their authenticity (archive.org, C-SPAN, many others) have thus become compromised. We could lose the thread of certain historical documents _permanently_.
But somewhere, in the shadows, or in a free land somewhere in the world, a proof-of-work blockchain lives on. It contains timestamped sha256sums of manifest files of videos, which in turn contain sha256sums of the videos. It proves that certain pieces of data existed at certain times. Once the regime falls, the authentic videos can be determined by the hashes that were published before the regime came to power.
Is anybody talking about this scenario and/or remedy? Maybe there's a less alarmist version to consider as well.