"Unfortunately, there has been a security breach involving NiceHash website", the company wrote, adding that it was freezing all operations for at least the next 24 hours while it investigated the hack. Also, purchasers of the Nicehash mining service may have lost the BTC that they paid into the service for alt coin hashing power. While adding that they are working to "verify the precise number of BTC taken" Coindesk notes that a wallet address tied to the company previously held 4,736.42 bitcoin, worth around $62 million at the time the took place but as of the current price of bitcoin is worth $68 million.
Cryptocurrency marketplace NiceHash said the contents of its bitcoin wallet had been stolen in a security breach and one executive said almost US$64 million had been lost.
"Importantly, our payment system was compromised and the contents of the NiceHash Bitcoin wallet have been stolen", said the official statement.
The site had been down for hours for what NiceHash initially said was maintenance.
The company stated that, in addition to an internal investigation, they had contacted the "relevant authorities and law enforcement" and that they are working to "rectify the matter in the coming days".
The company is recommending that its users change their passwords - both on NiceHash and other services - following the breach. We are fully committed to restoring the NiceHash service with the highest security measures at the earliest opportunity. We understand that you will have a lot of questions, and we ask for patience and understanding while we investigate the causes and find the appropriate solutions for the future of the service.
We are truly sorry for any inconvenience that this may have caused and are committing every resource towards solving this issue as soon as possible.