Well, that happened quickly. On June 12, bitcoin was trading for more than $28,000. By the end of June 13, it had fallen as low as $21,000. By June 18, bitcoin had dipped below $18,000. Bitcoin has rallied a bit since then and is currently trading around $20,350. Bitcoin dipped below $20,000 faster than I expected. I thought it would at least have the decency to wait until the July Fed meeting (July 26-27) or the…