I have definitely not installed any mining script on dMania and the site wasn't compromised.
It makes absolutely no sense that I would run a mining script on a small website like dMania. The rewards for that would be almost zero and I would lose all trust of the users. 
That would endanger the whole project and everything I have worked for the last 6 months.

The only way that is possible is that some third party library has included a mining script somewhere. I am going to investigate and check if it's true.
dMania uses a lot of libraries that could potentially include a mining script with a new update without my knowledge. That's the only possible explanation and could potentially happen to any website.

<b>Update</b>
Apparently there was actually running a crypto miner on dMania without my knowledge.  It was probably included in some external library in one of the last updates. I have updated all external libraries and the miner is gone.

I want to clarify that I had nothing to do with this. Projects like dMania use hundreds of libraries. Those libraries can potentially include a miner in a new update. I am now checking the code for that before every update so that won't happen again.

<b>Update 2</b>

Ok looks like the problem is not resolved. Atm I have no idea whats going on and how the miner gets onto the website. I took down dMania to protect the users until I fix it. ( dMania-bot is also down and won't upvote anything).

dMania will be online again when the problem is resolved.