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NiceHash marketing executive Andrej P. Škraba told Reuters his firm was the victim of "a highly professional" heist that yielded about 4,700 bitcoin, worth around $64 million at current prices.
The company said it was investigating the cause of the breach on Thursday as bitcoin surged above $15,000 for the first time, adding more than $2,000 to its price in 12 hours ahead of this weekend's launch of bitcoin futures by CBOE.
Bitcoin, the world's biggest and best-known cryptocurrency, has climbed more than 15-fold since the start of the year. The value of all cryptocurrencies, including bitcoin, now stands at about $415 billion, according to Coinmarketcap. That's a small fraction of the total amount of money in the world, estimated at about $84 trillion, according to Business Insider.
But some of the freewheeling cryptocurrency exchanges are plagued by poor security and lack investor protections common in more regulated financial markets.
There have been at least three dozen heists of cryptocurrency exchanges since 2011; many of the hacked exchanges later shut down, most notably Mt. Gox, which was the world's largest bitcoin trading exchange when it went under in 2014.
More than 980,000 bitcoins have been stolen, which today would be worth about $4 billion, Reuters found. Few have been recovered and burned investors have been left at the mercy of exchanges as to whether they will receive any compensation.
NiceHash, which halted operations on Wednesday after discovering the hack, has provided few details about the incident. It was not clear whether the company or its customers would end up losing the stolen bitcoin if they are not recovered.
Slovenian police are investigating the incident.
"Investigation is very intensive at the moment but we cannot talk about it in detail," Bostjan Lindav, deputy director of the Criminal Police Department, told reporters.
Škraba told Reuters that NiceHash was cooperating with local authorities, but declined to provide further information.
NiceHash, which matches people looking to sell processing time on their computers in exchange for the digital currency bitcoin, advised users to change online passwords in a statement published on Wednesday on its website.
"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," it said in the statement.