Re: How can this be done?

I guess I should have saved the full signed message somehow, right?

Yes

Unless you can type the exact same message again.

So I guess I can answer yesterday's question now:

Let's do an experiment:
~
Would that be OK?

I'll tell you on October 29 Wink

Nope

I just opened Electrum to post the full message, but I don't see like a signed message history or anything. Huh

I've never seen a wallet that keeps a history of signed or verified messages.