We are now investigating the nature of the incident and, as a result, we are stopping all operations for the next 24 hours.
The Slovenian-based bitcoin miner NiceHash says it is investigating a security breach and the possible theft of tens of millions of dollars' worth of bitcoins, as meanwhile the value of the virtual currency has soared to a new record high. Mt. Gox shut down in February 2014, saying it lost about 850,000 bitcoins, possibly to hackers.
"The incident has been reported to the relevant authorities and law enforcement and we are cooperating with them as a matter of urgency", it said. "We are working to verify the precise number of BTC taken", the company said in a statement, calling the breach "a matter of deep concern".
Although the NiceHash team did not reveal any amounts that may be missing, users circulated a wallet address that indicated 4,736.42 bitcoins - worth more than $62 million - is missing.
Troubles with the website over the past day or so drew alarm and complaints, with many bitcoin owners posting panicked comments on NiceHash's social media accounts.
As the price of Bitcoin continues to rocket, surging past the $14,500 mark at the time of writing, cyberattackers have once again begun hunting for a fresh target to cash in on in this lucrative industry. On Jan. 1 this year, bitcoin was priced at just under $1,000.
Bitcoin has proved popular with currency traders, going on a massive bull run in 2017.
A digital currency marketplace, NiceHash matches people looking to sell processing time on their computers in exchange for the digital currency bitcoin. Nicehash needs the Bitcoin to repay users who offer up spare computing power for mining various coins.
Bitcoin is the first, and the biggest, "cryptocurrency" - a decentralised tradable digital asset.