[GekkePrutser]

That's another problem: Moving your account to a different server in the fediverse. Which is indeed not possible currently.

Perhaps some kind of blockchain would be a solution? (No, I'm not trying to appeal to tech investors, I actually think it might offer just the solution here :P )

[Ambolia]

nostr (https://github.com/fiatjaf/nostr) seems to be a minimal possible solution. It doesn't seem to be much in use though, so I guess once that happens a few issues will come up.