When news surfaced two weeks ago of a fresh round of restrictions China was placing on businesses transacting in the bitcoin ecosystem, the value of bitcoin plummeted. The CoinDesk Bitcoin Price Index, for example, showed that bitcoin traded as low as $422 around Dec. 18, when the large Chinese exchange BTC China acknowledged that it wasn’t accepting new deposits in the local currency until it could find a new payment processor that would do business with it. But a funny thing has happened since then.