Nicehash is back online...
After over 60 million USD worth of Bitcoins were stolen from Nicehash wallet, they strenghtened security measures and urged Bitcoin nodes invalidating the malicious transactions from their wallet during the hack. Nicehash is still working on with law enforcement officials trying to recover the stolen coins, but it will take long time. Users are encouraged to generate new passwords and wallet addresses, and resetting two-factor authentication before resuming use of the site.