[irjustin]

You've got to look at it one level deeper. Why do you trust the guy who could sign using the original BTC?

That trust is built on 2 things. PGP is trusthworthy and BTC is worth listening to.

I replied to your other post, but it's embedded in "why is BTC worth listening to"?

BTC/Eth is trustworthy because fundamentally it is a self-contained math problem that can be self tested by anyone.

Today, there is no way to make video self-testable in a trustworthy fashion because you will always be asking "Who uploaded/created this?"