Bitcoin futures begin trading on Chicago’s CBOE

(Reuters) — Bitcoin futures jumped more than 20 percent in their eagerly anticipated U.S. debut, which backers hope will encourage wider use and legitimacy for the world’s largest cryptocurrency even as critics warn of the risk of a bubble and price collapse.
The launch on Sunday night may have caused an early outage of the Chicago-based CBOE Global Markets’ website. The exchange said that due to heavy traffic on the CBOE Global Markets website, the site “may be temporari