That seems way to easy to steal $68M. I'd never use Nicehash after this.

In related news, Nicehack staff last seen throwing a party with strippers and booze in Barbados. 

Matjaz Skorjanc, the Chief Technology Officer, original code author, and core developer for Nicehash, has a history of purposely and willfully assisting criminals.
 
 
See also:

http://spuz.me/blog/zine/N1c3H45h.html
...

...

 
I’m sure many of the readers here are well aware of what Darkode is. Darkode was an underground community forums for hackers all around the world to sell exploits, malware, etc. The marketplace was very successful until FBI’s conjoined Operation Shrouded Horizon which arrested some key individuals of the Darkode project and took the site offline. So how does all this tie in? In the video made by Nicehash, we see two individuals, CEO and Co-founder Marko Kobal, and CTO Matjaz Skorjanc. Let’s take a closer look at Matjaz; according to Kobal, Matjaz is the original author and core developer of Nicehash. Pretty big title in Nicehash. Let’s just google. We come across a blog post made by Brian Krebs located here. Matjaz Skorjanc aka Darkode core member Iserdo, has a very valued malicious past from what it seems. Involvement in Darkode and as the primary author behind the Mariposa botnet (more information about the botnet can be found here ). Matjaz was arrested and found guilty in 2010, here's an article that details all of it. What is this guy doing as the CTO of Nicehash? Very suspicious how he was arrested in 2010, but Nicehash was created in 2014 (that of which he was a core developer to).

http://spuz.me/blog/zine/N1c3H45h.html
 
and

https://www.youtube.com/watch?v=d_tK22w0hl0
 
and

http://www.nbcnews.com/id/38439213
"To use an analogy here," said Troy, "as opposed to arresting the guy who broke into your home, we've arrested the guy that gave him the crowbar, the map and the best houses in the neighborhood. And that is a huge break in the investigation of cyber crimes."

http://www.nbcnews.com/id/38439213
 
and

https://en.wikipedia.org/wiki/Mariposa_botnet
On 18 July 2010, Matjaž Škorjanc (alias: Iserdo), the creator of the "Butterfly bot" malware, was arrested in Maribor by Slovenian police for the first time,[16] but released due to lack of evidence. He was arrested again in October 2011.[17] In December 2013 Škorjanc was convicted in Slovenia of "creating a malicious computer program for hacking information systems, assisting in wrongdoings and money laundering."[18] He was sentenced to 4 years and 10 months imprisonment and fined €3,000 ($4,100).[19] The court also ordered the seizure of Škorjanc's property acquired with the proceeds of crime.[20] After he appealed the verdict his fine was in February 2015 raised for additional 25,000 EUR.[21]

https://en.wikipedia.org/wiki/Mariposa_botnet
 
 
It's hard not to think that it was an inside job.