On July 2, a cryptocurrency called “Bitcoin” surged to $5,935.70, up 4.6 percent from a year earlier.As of July 5, it’s worth $5.1 trillion.The gains followed a rally on July 1 that saw the cryptocurrency surpass $1,000, up from $7,849.90 a year ago.“The cryptocurrency market has always been volatile,” says John Murphy, founder of the […]