Cboe Global Markets, Inc., one of the worlds largest exchange holding companies, announced it has created the Cboe Gemini Bitcoin Futures Index (ticker symbol: XBTX), a new strategy performance benchmark index designed to replicate a constant one-month position in Cboe XBTSM Bitcoin Futures (ticker symbol: XBT).XBT futures began trading on Cboe Futures Exchange (CFE) on Sunday, December 10.More than 5,000 XBT futures contracts (single counted) have been traded since launch.