The company initially put the amount stolen at about 6.7 billion yen (US$59.48 million) when it announced the hacking incident at its Zaif exchange on Thursday.

In a press release issued on Friday, the Osaka-based firm said it has found 5,966.1 Bitcoin, 6,236,810.1 Monacoin and 42,327.1 Bitcoin Cash were stolen. Based on the Sept 18 closing prices of each coin, they are worth 7 billion yen (US$62.10 million), it said, adding about 4.5 billion yen is clients’ assets.

In a separate statement, the company also said it has reported the incident as a criminal matter to investigative authorities and it cannot disclose details of the hacking. The incident came at a time the cryptocurrency industry is under close scrutiny following the theft of US$530 million in digital coins at Tokyo-based cryptocurrency exchange Coincheck Inc. in January. Industry watchers said it is likely to affect the ongoing view at Japanese regulator Financial Services Agency on how to strike a balance between safeguarding users and nurturing technological innovation.