Genesis Mining is the biggest and most transparent cloud mining company online. They have been around 3 years plus with 500 000 members.

I have been with them for 14 months now and they did have some challenges in the last 4 weeks, but it is all back to normal now. Hash power for bitcoin, x11 and litecoin to be added soon. See their Twitter feed.

There are loads of videos on YT with proof of their mining farms. They are so big that Pool miners like BitClub is using their farms for hashing power.

I have 100% peace of mind to recommend them to you.

Cheers. :)