Exclusive: 'Flash Boys' protagonists aiming new exchange at gold

By John McCrank NEW YORK (Reuters) - IEX Group, which rose to prominence with its bid to shake up stock trading in the United States, now aims to do the same in the more than $5 trillion-a-year gold market with a new exchange being created by its spinoff TradeWind Markets, a board member of the new venture said on Tuesday. The protagonists of Michael Lewis's book, "Flash Boys: A Wall Street Revolt," are planning a gold exchange that would use elements of blockchain technology to improve transpar