What do you think about bitcoin?
From a programmer's perspective. This is a brilliant program that has a difficult cryptographic code. This is has created a genius or a large group of experts. But why they do not openly declare themselves?
From the economy's perspective. This is anarchism, just as in ancient times, people traded goods for pieces of gold.
In 2009 the code on an ordinary laptop could get some Bitcoins per day. After a year already used the powerful graphics cards for mininig bitcoins.
Now it does not make sense to use a regular computer to do this. Because cryptographic code of mining is complicated by the day.
Simply buy on the stock exchange. And then the intresting things begin. In 2009, some man bought a pizza for a few tens of Bitcoins (BTC). In those days 1 Bitcoin (BTC) cost less than a dollar.
And today 1 BTC = 175$
I think the money created by a mafia or FBI (or like that) for creating their own currency that is not controlled by anyone.
But while ordinary people can play the market. Especially chart looks very tasty.

Cagliostro Cosplay by Rat Sakura Quite Crimson
“First Yakuza War in 30 Years” Breaks Out
Valkyria Chronicles Remastered Revisits BLiTZ System
Fight! Iczer-One Censored: “They Don’t Even Care Anymore!”
Oxford University Textbook: “Miku = Cultural Appropriation”