Osaka-based cryptocurrency operator Tech Bureau Corp. said Thursday it estimates that about ¥6.7 billion ($59.7 million) worth of bitcoin and other digital currencies were stolen from its Zaif platform after its systems were compromised.
In a statement, the company said the heist apparently took place last Friday between 5 p.m. and 7 p.m. when the hackers gained unauthorized access to the exchange's hot wallets, which are less secure and where funds are held for immediate transactions, taking 5,966 bitcoins and unknown quantities of bitcoin cash and monacoin.
The exchange noticed the breach Monday. The company said it promptly reported the incident to the police and Financial Services Agency.