Bitcoin ‘a bubble, a Ponzi scheme, an environmental disaster’: Cryptocurrencies swing amid crackdown

Cryptocurrencies continued to whipsaw investors, sending Bitcoin to its lowest level since October before recovering, as worries over tighter regulation by U.S. authorities and central bankers elsewhere gave traders fresh reasons to exit after a brutal start to 2018. The selloff has now knocked about half a trillion dollars from digital coins since early January.…

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