Whether the private key is held in software or hardware chips.
The video-image should be authenticated.
Whether it is done threw watermarks or Steganography, or audio channels.
(It does not use meta data and is signed on the media itself).



It should not be necessary to sign every bit of data.
But to authenticate features well enough to be practical. Such as faces, signs and text and color.
Basically the standard is that it would prevent any reasonable misrepresentation such that a human could be deceived about the facts of a situation.
(Think security footage in a court of law for example.)

I'm giving this until 01JULY2028

It should use probably cryptographical principals at-least in part or have some other standard that gives confidence that it is not subject to AI size/intelligence measuring contest at-least by the prevailing opinion of the time.

I will refrain from betting on this market.