This process provides network activity. The miners (they are also called miners) provide security, transaction efficiency and anonymity in the system.
 For the "miner" earnings earned in the system new coins (every 10 minutes about 25 coins), which will be distributed among the participants. But for today, calculations are so complicated that using an ordinary computer for the acquisition of virtual coins, will bring only losses (depreciation of equipment, electricity, etc.). Now, miners are united in a bullet to combine computing power, and gained bitcoins are divided in proportion to the volume of performed calculations. There are sites (they are also called cranes), on which you need to enter the captcha and receive a reward in the form of satiš, but many will not earn them. Most of them extract the satoshi, and then they are thrown into cloud mining. Once again, the amounts there are not significant and how serious income should not be considered. Although almost all sites have a referral system and if you are able to invite a lot of people, then from their earnings, you will be charged%. If the audience is large, then earnings will, of course, not space bills, but money is money, the more you will not need to invest a single penny. The farm for landing is an ordinary PC with a processor, RAM, a motherboard, and most importantly with a good video card, and better with a few, which generates a virtual currency. If you have a computer with such characteristics, then it can be attributed to the landing farm, but frankly, with one video card it is not necessary to waste time, those days were long gone when it was possible to have a bag from a home computer. Now, under the майнинг bitcoin allocate separate rooms with a large area and special racks for servers. Video cards are not all suitable (NVIDIO will be of little use), will fit ATI RADEON, starting from the seventh generation. Equally important is the volume of power supplies and many other nuances. Data is stored in the base of the blocks (peculiar chains). Each computer separately collects its chain, and if he collected the first, then he is paid a fixed amount (reward). Low-power computers and farms will be significantly inferior to faster and, accordingly, the likelihood of earning Bitcoin is significantly reduced.
To summarize, we can conclude that today the mining farm is a loss-making business, equipment does not pay off and therefore does not bring income. For a long time, a huge niche has taken huge companies that have huge installations in the form of cascades of powerful ASIC controllers. One such company (CES) provides nearly one third of all online transactions. This kind of earnings has already exhausted itself.
As an option, you can have another cripple currency that has its own audience, so that it can be assured that demand for it will not fall. And the available power of your computer will still be able to bring you such a desirable income.