A version of this story first appeared in CNN Business’ Before the Bell newsletter. Not a subscriber? You can sign up right here.Bitcoin is trading nearly 40% below its record price of $64,000 following a sudden crash sparked by regulatory moves in China. Ethereum is down more than 35% from its all-time high, and dogecoin is off more than 45%.Investors expect cryptocurrencies to be volatile. But the severity and breadth of the pullback has traders worried about a potential bubble,

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