Roger Ver renounced his U.S. citizenship in 2014 and later became a citizen of St. Kitts and Nevis, but is now contesting U.S. extradition.

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The feds have accused Ver, who became a citizen of St. Kitts and Nevis in 2014, of concealing over $48 million in gains from Bitcoin sales while preparing to expatriate.

Mr. Ver, a former California resident who renounced his U.S. citizenship in 2014, was arrested last year in Spain, according to the Justice Department, which announced plans at the time to extradite him.