Around midnight Nicehash mining pool was hacked. The result – payout wallet had been emptied by unknown party. Right now, the pool's website is down for maintenance with official press release in place. According to them, the security breach is being investigated right now.
The net is ripe with rumor about this incident. The best guess, confirmed as of now, was that Nicehash Bitcoin payout wallet have been stolen. While the staff didn't release any information about exact amount, the pool's patrons across social media conclude, that the pool's wallet had 4449 BTC and all the money were gradually transferred to another account during several days and sent away to wipe the trail. If the guess is correct, than the logical question would be why no one from Nicehash noticed the transfers during that time, and the investigation, internal and by the local authorities, began only when the wallet balance hit zero?
The official press release doesn't disclose such information, only citing, that appropriate authorities and local law enforcement have been notified and everything in their power is being done to restore site and pool operations.
In response to the security breach of that magnitude the pool's website has been shut down and hasn't come online as of yet. By users’ reports, all the mining operations have also been suspended until further notice. Users can't log in to view their payout balances, and the note on the site strongly recommends to change online passwords, as a precaution.