Читать книгу Cryptocurrency All-in-One For Dummies онлайн

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Because mining is based on a form of guessing, for each block, a different miner guesses the number and is granted the right to update the blockchain. Whoever has the biggest computing power combined, controlling 51 percent of the votes, controls the chain and wins every time. Thanks to the law of statistical probability, the same miner is unlikely to succeed every time. On the other hand, this game can sometimes be unfair because the biggest computer power will be the first to solve the challenge equation and “win” more often.

If you’re a miner and want to actually enter your block and transactions into the blockchain, you have to provide an answer (proof) to a specific challenge. This proof is difficult to produce (hence all the gigantic computers, time, and money needed for it), but others can very easily verify it. This process is known as proof of work, or PoW.

For example, guessing a combination to a lock is a proof to a challenge. Going through all the different possible combinations to come up with the right answer may be pretty hard, but after you get it, it’s easy to validate — just enter the combination and see whether the lock opens! The first miner who solves the problem for each block on the blockchain gets a reward. The reward is basically the incentive to keep on mining, and it motivates the miners to compete to be the first one to find a solution for mathematical problems. Bitcoin and some other mineable cryptocurrencies mainly use the PoW concept to make sure that the network isn’t easily manipulated.