It is not sufficient to have a record of facts when others have alternative facts. To your signed record of facts they would just introduce alternate facts with alternative signatures and claim you had made it up. Normal people don't have the tools or experience to differentiate, and the alternative facts support a story they want to believe, rather than hard truths.

News media won't even mention your so-called 'real facts', facebook and twitter might not let others see them. Before you know it you'll be denounced by your neighbours, work colleagues and friends as a traitor, a madman. You'll lose your job, or your partner will. There may be a show trial and public denunciation. This has all happened before: the USSR, McCarthy.

If you don't want that you need an alternate means of distributing real facts, and countering fake ones. It has to be hosted so deeply in our tech infrastructure that it can't be firewalled or jammed. It needs to be accessible covertly. And it needs to record all the alternative facts too, because they like to change their facts.

Let's call it Samizdat.