I advice you to buy and holding the coins right now because we expect the Bitcoin's price will increase soon.I think that's the best profitable investing into Bitcoin

A Ponzi scheme is a fraudulent investment operation where the operator, an individual or organization, pays returns to its investors from new capital paid to the operators by new investors, rather than from profit earned by the operator. Operators of Ponzi schemes usually entice new investors by offering higher returns than other investments, in the form of short-term returns that are either abnormally high or unusually consistent.

There is a lot of ponzi scheme online. 

If you want to invest your BTC then PM me. I will help you out.

you'd better be careful of the mine site. likewise used ponzi system or something.
I do not think if the mining profitable. I prefer investing in altcoin for short term

It's a fucking ponzi. No cloud mining site could offer 4% daily returns. It's a pathetic hyip.

Go to thoses sites, make an account and you'll see a section where you can loan.
Best of all its risk free.

Take your btc and loan it out to margin traders on bitfinnex, or poloniex.
It's safe way to make some extra money.

seems a brand new cloudmining site. I know about many cloud mining sites. but this one I saw first time. I just checked it, and found it looking good. but it need full review and confirmation. I just suggest you please don't make deposit until you won't be 100% confirm about it. there are 90% cloud mining sites fake. so be warn.