Not sure if any of you have watched an interview with co-founder of ZEN about the 51% attack.  I'm doing some investigating.

I've never used Nicehash before.  If anyone else has, can you answer a question for me with 100% assurance your answer is correct.  If you're not 100% sure and still answer, please let us know you're not 100% sure when you do answer.  The reason for my question involves "private" mining.

Does Nicehash ask for personal information when one purchases hash from them to mine?

If you watched this interview, maybe you'll understand why I'm asking that question:  https://www.youtube.com/watch?v=MWJTC55tk-s

By the way, ZEN will be doing a number of things to "kill" private/secret mining.  First step begins in July.  You'll hear that in the video.