Bitcoin tops $18,000 in debut on major bourse

Bitcoin surged past $18,000 after making its debut on a major global exchange but was trading lower on Monday, highlighting the volatility of the controversial digital currency that has some investors excited but others nervous.

Bitcoin futures launch sparks excitement, warnings

Bitcoin will make its debut on a major exchange Sunday, a landmark for the cryptocurrency that has generated enthusiasm among some investors and more than a little anxiety from others.

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