Wall Street’s main regulator is boosting its scrutiny of brokerages that deal in cryptocurrencies, according to two people familiar with the matter, the latest sign that authorities want to know more about a burgeoning market that they fear might be full of misconduct.
Traders trade VIX contracts at the Cboe Global Markets exchange (previously referred to as CBOE Holdings, Inc.) on Dec. 19, 2017 in Chicago, Illinois. Scott Olson/Getty Images
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