(Bloomberg) -- After the long-anticipated launch of US Bitcoin exchange-traded funds in January, and the once-every-four-years software update called the “halving” last month, the big question on a lot of crypto investors’ minds has been, what will power the largest cryptocurrency’s next rally?Most Read from BloombergIranian President Is Missing After Helicopter Crash in Dense FogGantz Says He’ll Quit Unless Netanyahu Moves to New War PlanEven if Alito Is Right, the Upside-Down Flag Was WrongChi