I would say they implimented it based off some other theories and ideas (outside of crypto) . I'm on mobile and this is tough to link but if you scroll through the pages I've left (and others) a good trail of answers that explain more how it works. When I get home I can link too .
Just got to sort through some of the early pages of invite spam. But some solid answers the past 24 hours
You've been more than helpful already. I'll take a look at all your replies in the last 24 hours. I'll definitely be using your link as well. Thanks so much!