Cryptocurrency prices today: Bitcoin tests $40,000, Dogecoin down over 12%. HIGHLIGHTS: Bitcoin tests $40,000. Dogecoin down over 12%. Tesla sold 10% of its Bitcoin holdings. Elon Musk's investment remains unchanged. Tesla makes more money by selling Bitcoin. Cryptocurrency market crash. $600 billion wiped out crypto tumble is becoming very painful. Elon Musk says Tesla has …









