Somehow dMania got infected with a crypto mining script. I don't know how it got there. Maybe some malicious library or a xss attack.
I took down dMania to protect all users until I fix it. ( dMania-bot is also down and won't upvote anything).
All your keys are safe, because no keys are stored or entered via dMania. Everything key related is handled via SteemConnect.
I want to clarify that I had nothing to do with the mining script. Mining scripts have even infected big websites like YouTube in the past -> https://www.tomsguide.com/us/youtube-mining-malware,news-26530.html. This can potentially happen to every website.
I take this threat very seriously and try to resolve it as fast as I can.
dMania will be online again when the issue is resolved.