By Dan Weil This year ‘is likely to be a more challenging and more mean-reverting year for digital assets,’ JPMorgan strategists write. Bitcoin has soared 25% over the past 19 days, but that hasn’t made a believer out of JPMorgan. Its strategists, led by Nikolaos Panigirtzoglou, put fair value for the world’s biggest digital currency at $38,000, 13% below the recent level of $43,884. The year 2022 “is likely to be a more challenging and more mean-reverting year for digital assets,” the strategists wrote in a commentary. “The biggest challenge for bitcoin going forward is its volatility and the…