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In 2009, it had been 50. In 2013, it was 25, at the time of writing it is 12.5, and sometime in the middle of 2020 it will halve to 6.25. .

At this rate of halving, the entire number of bitcoin in circulation will approach a limit of 21 million, making the currency more scarce and precious over time but also more costly for miners to make.

Here is the catch. In order for bitcoin miners to really earn bitcoin from verifying transactions, two things must happen. To begin with, they must verify 1 megabyte (MB) worth of transactions, which can technically be as small as 1 transaction but are far more often a few thousand, depending on how much information each transaction stores.

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Second, in order to put in a block of transactions to the blockchain, miners should solve a intricate computational science difficulty, also referred to as a"proof of labour ." What they're actually doing is trying to think of a 64-digit hexadecimal number, known as a"hash," that is less than or equal to the hash.

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In other words, it's a gamble. .

The difficulty level of the most recent block at the time of writing is all about 7,184,404,942,701. That is, the chance of a pc producing a hash below the goal is just 1 in 7,184,404,942,701 less than 1 in seven trillion. That amount is corrected every 2016 cubes, or about every two weeks, with the goal of keeping rates of mining constant.

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The reverse is also true. If computational power has been taken off of this network, the difficulty adjusts downward to earn mining simpler. .

"Say I tell three friends I'm thinking of a number between 1 and 100, and I write that number on a sheet of paper and seal it in an envelope. My friends don't have to guess the specific number, they simply have to be the very first person to figure any number that's less than or equal to the number I'm thinking of.

"Let's say I am thinking of the number 19. If Friend A guesses 21they lose because 21>19. If Friend B guesses 16 and Friend C supposes 12, then they've both technically came at viable answers, since 16<19 and 12<19. There's no'extra credit' for Friend B, even though B's answer was closer to the goal answer of 19. .

"Now imagine that I pose the'imagine what number I am thinking of' question, however I am not asking only three friends, and I'm not thinking of a number between 1 and 100. Instead, I am asking millions of prospective miners and I am thinking of a 64-digit hexadecimal number. Now you see that it is going to be quite difficult to guess the ideal answer." .

If 1 in 7 trillion doesn't sound difficult enough as is, here is the grab to the catch. Not only do bitcoin miners have to think of the right hash, they also must be the first to do it.

Since bitcoin mining is essentially guesswork, arriving at the right answer before another miner has everything to do with how fast your computer can create hashes. Just a decade ago, bitcoin miners can be performed competitively on normal desktops. Over time, however, miners realized that graphics cards commonly utilized for video games were more capable of mining than desktops and graphics processing units (GPU) came to dominate the game.

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These can run from \$500 into the tens of thousands. .

Nowadays, bitcoin mining is so aggressive it can only be done profitably using the most up-to-date ASICs. When using desktop computers, GPUs, or older models of ASICs, the cost of energy consumption actually surpasses the revenue generated. Even with the newest unit available, one pc is seldom enough to compete with what what miners call"mining pools" .

A mining pool is a group of miners who combine their computing power and divide the mined bitcoin between participants. A disproportionately high number of cubes are mined by pools rather than by individual miners. In July 2017, mining pools and companies represented roughly 80% to 90 percent of bitcoin computing power. .

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Between 1 in 7 trillion chances, scaling difficulty levels, and also the huge network of users verifying transactions, one block of transactions is confirmed roughly every 10 minutes. But its important to keep in mind that 10 minutes is a target, not a rule.

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The bitcoin discover this network can process about seven transactions per second, with transactions being logged in the blockchain every 10 minutes. Since the network of bitcoin users continues to grow, but the number of transactions made in 10 minutes will eventually exceed the number of transactions that can be processed in 10 minutes.