Usual disclaimers: Blockchain is a real technology and crypto currencies have uses, both of which are a tiny fraction of what their backers claim. Take away th

Usual disclaimers: Blockchain is a real technology and crypto currencies have uses, both of which are a tiny fraction of what their backers claim. Take away the hyperbole and technical mumbo jumbo interlaced with the financial mumbo jumbo, and cryptocurrencies and blockchain are less interesting than the latest PostgreSQL update. But it's that mumbo jumbo that separates ordinary people from their dollars.