Magic internet money—also known as cryptocurrency—is at an all-time high. The experts who watch this stuff predict that one bitcoin (the most famous cryptocurrency) will soon be worth $2,000. The big selling point of cryptocurrencies like bitcoin is their use of something called the blockchain to make any transaction mostly trustworthy. In a cryptocash economy, the blockchain renders treasuries, banks, credit cards, and other financial organs vestigial. Enthusiasts believe these decentralized, cryptographically sealed databases could starve inefficient middlemen from virtually any system.