[tcmb]

> What this might usher in is the era of cryptographically signed news articles.

Actually, how about cryptographically signing videos as they get written on the recording device?

Maybe there even are ways to sign data so that the integrity can get validated on shorter segments, so that clips can be cut. Write a signature every 5 seconds for the past 5 seconds?

Edit: This exists and the term for it is 'video authentication'.

[ric2b]

> Actually, how about cryptographically signing videos as they get written on the recording device?

That wouldn't prove much besides that the person sharing the video had access to the device's private key. I think the best you can do is timestamp the video by uploading a hash of it to a blockchain, but even then that only proves the video existed sometime before that instant.