A Congressional report quietly released last month suggests that bitcoin could be a threat to US monetary policy, and makes the case for continued central banking control. The report, Bitcoin: Questions, Answers, and Analysis of Legal Issues, was published by the Congressional Research Service, which produces research reports for US policy makers. It argues for the benefits of a single, incumbent currency (the US dollar), for stability. “If greater use of bitcoin (and other cryptocurrencies) leads to multiple monetary units, these benefits could be threatened, particularly if these new currencies continue to exhibit a high degree of price volatility,” the...