FeaturedSundays historic opening of Chicago Board Options Exchange Cboe bitcoin futures proved almost too much for the legacy market maker The worlds most popular cryptocurrency however remained resilient and contracts went long assuming its price would continue to rise bullish As its crosstown rival Chicago Mercantile Exchange CME readies for its bitcoin futures this coming Monday the only major broker offering such futures reversed course and is now allowing its moniedclients whales to also short bitcoin an expensive and risky trade for bulls