By Bret Kenwell Bitcoin is trading lower on Monday, as the cryptocurrency works on its seventh consecutive weekly decline. Here’s how to trade it from here. Bitcoin has weathered the storm better than many growth stocks have, but it hasn’t been immune to the volatility in the markets. The biggest cryptocurrency is down almost 5% on Monday, heading for its fifth straight daily decline. In that stretch, bitcoin is down almost 20%. It has fallen in six straight weeks and lost 27.5%. Coming into that six-week skid, bitcoin was actually up 1.4% on the year, (although it was down 32% from the all-ti…