Federal regulators have given the go ahead to the Cantor Exchange, one of two online futures markets that would allow the public to wager real money on box-office results of Hollywood films, according to the Associated Press. The Commodity Futures Trading Commission gave their approval to the exchange on Monday, two weeks after a second market, Media Derivatives’ Trend Exchange, also got the green light. But hold onto your credit cards and your box-office hunches for now. Both markets face an uphill battle later this week when legislation banning the trading on box-office tallies goes before congress as part of a broader financial regulation vote. As the markets have made their way through the regulatory process over the past few months, both the six major Hollywood studios and the MPAA have come out strongly against them. Stay tuned….