I don’t understand how this will help deep fake and fake news.

Like, if this post was signed, you would know for sure it was indeed posted by @[email protected], and not by a malicious lemm.ee admin or hacker*. But the signature can’t really guarantee the truthfulness of the content. I could make a signed post that claiming that the Earth is flat - or a deep fake video of NASA’a administrator admitting so.

Maybe I’m missing your point?

(*) unless the hacker hacked me directly