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Not much moves cryptocurrency markets like Elon Musk tweets -- except, perhaps, the idea of another crackdown in China, the world’s second-largest economy. From a trading ban on domestic exchanges to squeezes on power-consuming digital currency miners, Chinese regulators have tried to tamp down risks related to the stratospheric rise of Bitcoin and its peers for years. However, a recent spate of official warnings has unnerved traders anew, even though some appear to reiterate previous positions.