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Crappiest site ever. I used it to mine dogecoin and I was constantly losing mined coins. I stopped using it after 2 days.

Try the site you not need invest

"Virtual currencies may hold long-term promise, particularly if the innovations promote a faster, more secure and more efficient payment system." - Ben Bernanke

You can mining bitcoin free in this site https://xmine.org/registration/?referal=18735