The block chain is a central component, but (afaik) everyone has been doing it (slightly but thus catastrophically) wrong.
But how to do it right? That's the big question.
For me at the moment, I posit and claim it is no longer a question, rather a secret to be proven. Apology for that. I am moving as fast as I can.
Next step is that they fear the same also in private, encrypted communication, because they can not trust their own friends or relatives not to flag them.
That is why in the Knowledge Age you create an anonymous identity and operate from it when doing any digital exchange. You do not tell anyone this identity, not even your wife.
With your physical identity you discuss only safe topics such as "how is the weather?" or "the grand kids are growing up fast".