It seems like the goal would be to make this ubiquitous enough that eventually you'll expect all clips to be signed, although this would of course take quite a

It seems like the goal would be to make this ubiquitous enough that eventually you'll expect all clips to be signed, although this would of course take quite a long time to achieve, which would indeed undermine the authenticity guarantees a system like this could provide. It seems like official channels like CSPAN, white house press briefings, and other world governments could get immediate benefit by applying these methods to all of their official communiques.