Nicehash mining pool hacked, payout system compromised

Nicehash mining pool hack officially confirmed, payout wallet with 4449 BTC now empty
07 December 2017   2418

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.

Sparkpool to Freeze $300k Reward

As reported, pool suggests that such a high commission could have been paid by someone in error and is considering the possibility of a refund
20 February 2019   68

The Sparkpool mining pool decided to freeze the remuneration in the amount of 2,103,1485 for the extraction of block # 7,238,290. The management of the organization suggests that such a high commission could have been paid by someone in error and is considering the possibility of a refund, CoinDesk reports.

The head of the Sparkpool Xin Xu argues that users of the pool understand and agree with the decision, given the size of the amount involved.

Unfortunately, and fortunately, blockchain is so far not completely run by machines; human are still involved. So we have an opportunity to correct the problem. Integrity is our pool’s priority.
 

Xin Xu

CEO, Sparkpool

While some users suggested that a large commission was paid by mistake, others admitted that this could be a goodwill gesture from an anonymous donor to the community of the miner or even an attempt to launder money through the blockchain cryptocurrency.