Venezuelan President Nicolas Maduro looked to the world of digital currency to circumvent U.S.-led financial sanctions, announcing on Sunday the launch of the “petro” backed by oil reserves to shore up a collapsed economy.The leftist leader offered few specifics about the currency launch or how the struggling OPEC member would pull off such a feat, but he declared to cheers that “the 21st century has arrived! Venezuela will create a cryptocurrency, backed by oil, gas, gold and diamond reserves, Maduro said in his regular Sunday televised broadcast, a five-hour showcase of Christmas songs and dancing.