(Bloomberg) -- A unit of crypto exchange Kraken is emerging as a key beneficiary of this year’s boom in spot-Bitcoin exchange-traded funds, which debuted in the US in January and rolled out in Hong Kong this week.Most Read from BloombergSaudi Arabia Steps Up Arrests Of Those Attacking Israel OnlineApple Rallies on Upbeat Forecast, Record-Setting BuybackTurkey Confirms All Trade Halt With Israel Over War in GazaHuawei Secretly Backs US Research, Awarding Millions in PrizesIn Jamie Dimon's America