Japan’s cryptocurrency exchanges have reported a total of 669 suspected money laundering cases to the country’s National Police Agency, according to a report by Nikkei Asian Review.

Japanese cryptocurrency exchanges have been having a rough time lately with a major hack ($550 million) and some major technical glitches – one that almost cost one exchange $20 trillion. As a result, the Japanese authorities have been cracking down on the exchanges.

This new report by Nikkei, released yesterday, indicated that the reports on the crypto-money laundering cases were collected over a span of nine months from April to December last year.