Also bear in mind that the rate of obsolescence in Bitcoin mining hardware is quite fast! This happened in early It adjusts to hashrate to ensure that blocks are found roughly every 10 minutes. If your goal is to obtain bitcoins, then there is really no reason to cloud mine or even mine at all. To determine your own power cost, check worldwide electricity prices or your utility bill for the exact price. In just the last few months, two cloud mining scams were uncovered: HashOcean and Bitcoin Cloud Services.