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

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

Here's the catch. In order to get bitcoin miners to really earn bitcoin from verifying transactions, two things have to happen. First, they must confirm 1 megabyte (MB) value of transactions, which can theoretically be as small as 1 transaction but are more often a few thousand, depending on how much information each transaction shops.

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Second, in order to add a block of transactions to the blockchain, miners should fix a intricate computational math problem, also referred to as a"proof of work." What they are 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 about 7,184,404,942,701. In other words, the chance of a computer producing a hash beneath the goal is 1 in 7,184,404,942,701 less than 1 in 7 trillion. That level is corrected every 2016 cubes, or about every 2 weeks, with the aim of keeping rates of mining constant.

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The reverse is also true. If computational power has been taken from this network, the problem adjusts downward to make mining simpler. .

"Say I tell three friends I'm thinking about a number between 1 and 100, and that I write that number on a piece of paper and seal it in an envelope. My friends don't need to guess the exact number, they simply must be the first person to guess any number that's less than or equal to this number I am thinking of.

"Let us say I am thinking about the number 19. If Friend A guesses 21, they lose because 21>19. If Friend B supposes 16 and Friend C guesses 12, then they have both theoretically arrived 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 target answer of 19. .

"Now imagine I present the'imagine what number I'm thinking of' question, but I am not asking only 3 friends, and I am not thinking of a number between 1 and 100. Instead, I am asking millions of prospective miners and I'm 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 seven trillion doesn't sound difficult enough as is, here is the grab to the catch. Not only do bitcoin miners need to come up with the right hash, but they also must be the right here very first to perform it.

Because bitcoin mining is essentially guesswork, arriving at the ideal answer before another miner has everything to do with how fast your computer can create hashes. Just a decade ago, bitcoin miners can be carried out competitively on normal desktops. Over time, however, miners realized that pictures cards commonly used for video games tend to be 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. .

Today, bitcoin mining is so competitive that it can only be done profitably using all the latest up-to-date ASICs. When using desktop computers, GPUs, or older models of ASICs, the expense of energy consumption actually exceeds the revenue generated. Even with the newest unit available, one computer is rarely enough to compete with exactly what miners call"mining pools." .

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

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Between 1 in 7 trillion chances, scaling difficulty levels, and the massive network of users verifying transactions, one block of transactions is verified roughly every 10 minutes. However, its important to remember that 10 minutes is a target, not a rule.

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The bitcoin network can process about seven transactions per second, with transactions being logged in the view website 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.