Bitcoin soars above $17,000, boosting worries and a worldwide frenzy

U.S. exchange groups and markets, including NASDAQ and CME Group Inc., will begin trading Bitcoin in 2018. The value of the cryptocurrency has soared to $17,000 a coin in December. (Jhaan Elker/The Washington Post)

U.S. exchange groups and markets, including NASDAQ and CME Group Inc., will begin tr …
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