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.