Jamie Dimon did not hold back. In a Fox Business interview at the Reagan National Economic Forum, the JPMorgan Chase chief executive took direct aim at Brian Armstrong, the CEO of Coinbase Global. He called him “full of shit.” The target of his ire? Armstrong’s aggressive push to shape a landmark cryptocurrency bill making its way through Congress. The Digital Asset Market Clarity Act, often shortened to the CLARITY Act, seeks to establish a federal framework for digital assets. It would clarify roles for the Commodity Futures Trading Commission and the Securities and Exchange Commission. Yet its provisions on stablecoins have ignited fierce resistance from traditional banks. And Dimon made clear where he stands. “We’ll fight it,” he said. “If we lose, we lose, and we’ll live.” Banks, he insisted, “will not accept” the bill in its current form. No one is going to bow down to Armstrong or his company.…