New York — It takes a lot to startle fans of bitcoin, the digital gold of the moment. But Wednesday was, well, a lot — a wild run of exuberant peaks and white-knuckled declines that left even diehards breathless. The dizzying rally in bitcoin, a bull market with few precedents in investing history, was abruptly interrupted by a market outage in the US that seemed to captivate Wall Street even more than the day’s sell-off in high-flying technology stocks. Only hours after soaring past $11,000 — a price that represents a gain of more than two-fold since September — bitcoin plunged nearly 20% in less than 90 minutes. Whether the swoon represented a brief setback or the start of something worse, the wild ride underscored just how volatile the cryptocurrency has become in what some warn could be one of the biggest bubbles of all time. "Bitcoin trading isn’t for the novice investor," said John Spallanzani, chief macro strategist at GFI Securities in New York, who does technical analysis o...

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