Buddy, if you think those sites are scam, then you can try this site coinpot.co. In that site you can mine three cryptocurrencies 1) bitcoin,2) dogcoin and 3)litecoin and don't worry they are not scam. You can trust them 100% and also their minimum withdrawal threshold is very low. So you can easily cashout daily. But don't expect to make a lot of money by doing mining in the first day itself. It all depends upon the power of your cpu.