you can order 1 or 2 but such websites are very

Principles of mining
 For example, I told the three friends that the thought of a number from 1 to 100. I recorded this number on the worksheet that was hidden in the envelope. My friends don't even need to guess the exact number — just the first to call a number that is less than or equal to the number in the envelope. The number of attempts is not limited. Suppose I have in mind 19. If a friend And say "21" he will lose because 21 is bigger than 19. If each says "16" and each is "12", both answers can theoretically be counted, because and 16, and 12 is less than 19. Friend B does not receive any additional benefits, although his response was closer to the target number wins the one who offers your first option. What happens if friends B and C are answered at the same time? In the bitcoin network simultaneous responses occur regularly, but the award can only get one. In this situation, to decide which of the miners is worthy of, should the entire network. The decision is taken by simple majority of votes — 51%. Typically, the award goes to the miner who has accomplished more useful work, i.e. was verified by the most transactions

Video cards usually use the normal serial (for both games and regular work), but in July of 2017 began to appear in the special line of graphics cards for mining with NVIDIA P106-100 and P104-100 (similar to serial GTX GTX 1060 and 1080). They are adapted for hashing and different from the serial great hasraton issued by the (speed of production), but at a guarantee — 3 months. Graphics P106-100 and P104-100 is already in the open market. But because of the very small warranty period data the model line has not gained much popularity and miners.

Principles of extraction
 For example, I said tram friends, that the thought of a number from 1 to 100. I recorded this number on the list in SPA convert. My friends don't even need to guess the number the first enough to call the number that is less than or equal to the number to convert. The number of attempts to organize. Suppose I have in mind 19. And If a friend says "21" that he regrets, because 21 is bigger than 19. If a friend says "16" and each is "12", both theoretical answer can be counted, because and 16, and 12 is less than 19. Other B benefits do not receive any additional though his answer was closer to the number of person — win the one who will offer your first option. What happens if friends said B and C at the same time? In BTC-network Anthem responses occur regularly, but can only get one. In this situation, to decide who Ismayilov meritorious, should the entire network. The decision is taken by simple majority of votes — 51%. Typically, the award goes to the miner who has accomplished more useful work, i.e. was verified by the most transactions. Now imagine that the friends I have significantly more than three, and conceived the number is not limited to the range from 1 to 100. As friends are the millions of miners, conceived the number is a 64 — digit, and also in hexadecimal notation. As you can imagine, to guess the correct answer will be very difficult.