The price of bitcoin swung wildly Thursday, rising to more than $19,000 only to fall sharply within minutes, as both the euphoria and anxiety surrounding the virtual currency escalated just days before trading in bitcoin futures begins on a major U.S. exchange. The concerns about its volatility have led some Wall Street banks and trade groups to raise concerns about the potential implications of trading bitcoin. Banks also appear likely to limit customers’ access to the futures when they first start trading. Bitcoin was valued at $17,167 as of 6:00 p.m. EST, according to large bitcoin exchange Coinbase, after briefly ... (full story)