Just as bitcoin trading hit record highs this week, hackers made off with nearly $70 million from a major cryptocurrency-mining service NiceHash. The Slovenia-based company announced the security breach on its Facebook page Wednesday afternoon and stopped operations for 24 hours. Here’s everything we know so far in the days following the attack: The NiceHash hack is the 4th largest breach in cryptocurrency history Although the exchange rate for Bitcoin is still trading at an all time high at a whopping $15,400, other crypto thefts were much more detrimental when converting the exchange rate at the time of the theft, cryptocurrency research website CoinGecko co-founder Brian Ong told MONEY. The largest cryptocurrency hack occurred in February 2014, when hackers stole approximately $450 million from Mt.