The decision published Friday upheld a lower court ruling allowing 38-year-old Alexander Vinnik to be tried in his native Russia for alleged fraud worth 750 million rubles ($11 million.)
The Greek supreme court also has accepted an extradition request from the United States, where Vinnik is accused of allegedly laundering billions of dollars with bitcoin. He was arrested in Greece last year on a U.S. request.
The court is scheduled to discuss a French extradition demand for Vinnik next week.
Greek authorities are also investigating Vinnik for possible cybercrimes in Greece, which might delay his extradition.
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