proof-of-truth was a joke on the proof of work, stake, brain :)

but it is not what i was thinking about.

Knowing nothing about how it could be done, using Hive for verification of authenticity of an video by connecting the video with the publisher (hive account) should be possible. i hate when i know but don't know the terminology, adding a hash? to a video and writing it on the chain to be able to verify that it was published by specific person.