A U.S. probe into Tether is homing in on whether executives behind the digital token committed bank fraud, a potential criminal case that would have broad implications for the cryptocurrency market.

Criminal charges would mark one of the most significant developments in the U.S. government’s crackdown on virtual currencies. That’s because Tether is by far the most popular stablecoin -- tokens designed to be immune to wild price swings, making them ideal for buying and selling more volatile coins. The token’s importance to the market is clear: Tethers in circulation are worth about $62 billion and they underpin more than half of all Bitcoin trades.

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