Bitcoin, cryptocurrencies, blockchain, decentralization, China's digital yuan, Facebook's libra—the U.S. is understandably worried about the dominance of the almighty dollar. Last year, U.S. president Donald Trump slammed bitcoin as based on "thin air," while his Treasury secretary Steven Mnuchin branded bitcoin a "national security threat." Now, the U.S. has admitted bitcoin and cryptocurrency could undermine the dollar's status as the world’s reserve currency—and it wants to find out exactly how bad for the country, its economy, and security that could be. "Many cryptocurrency enthusiasts predict that either a ... (full story)