(Bloomberg) -- Bitcoin has had a sleepy summer. This week, it was shaken awake. Most Read from BloombergChina Evergrande Group Files Chapter 15 Bankruptcy in New York‘Poor Man’s Cocaine’ Costing $3 a Pill Threatens to ProliferateBitcoin Calm Shatters With Sudden Tumble, Mass LiquidationsBig Tech Logs Year’s Longest Weekly Losing Streak: Markets WrapVietnam Tycoon Loses $18 Billion After EV Maker’s Shares SinkFor the past several months, the hallmark volatility that previously attracted hordes of