Unlock the Editor’s Digest for freeRoula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.The top US derivatives watchdog has warned against a regulatory “gap” for cryptocurrencies and called for more scrutiny of political betting markets.Rostin Behnam, chair of the Commodity Futures Trading Commission, told the Financial Times he would step down on January 20, the day of president-elect Donald Trump’s inauguration. Behnam led the CFTC for four years as it finali...