...Some time ago I bought cloud mining contract that already returned above ROI and is still paying...
Could you be specific? What contracts, when bought.
thx
Yes do tell...as I have never seen one that did well. It must be a private setup?
I can give two examples of publicly available contracts with which it was possible to ROI (in coins terms). One is mining bitcoins and it's PBMining - if bought in February it'd be already positive. Second is mining altcoins and it's LTCGear - the best time to buy them was at the time they allegedly deployed new chips (around July).
However, I don't have 'smoking gun' evidence of legitimacy in both cases.
In PBMining case positive ROI if calculated as of today in fiat would require successful hedging of your investment and would be more difficult to achieve.