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The move is a sign of increasing concern that new forms of private money could disrupt Japan's financial system.
A U.S. judge ordered William H. Hinman, the former chief of the commission's corporate finance division, to sit for questioning.
Customs authorities say the alleged money laundering syndicate charged criminal clients a commission of 3% to 5%.
The agency has extended its initial 45-day review period.
Canaan has begun deploying its latest Avalon Miner units. The firm will also be attempting to expand its business scope and customer base.
The crypto will be converted into U.S. dollars first, before being deposited into the National Republican Congressional Committee's account.