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In 2009it 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 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 expensive for miners to produce.

Here is the catch. In order for bitcoin miners to actually earn bitcoin from verifying transactions, two things have to happen. First, they must verify 1 megabyte (MB) worth of transactions, which can technically 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 solve a intricate computational math problem, also referred to as a"proof of work" What they are doing is trying to come up with a 64-digit hexadecimal number, called a"hash," that's 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 pc producing a hash below the target is just 1 in 7,184,404,942,701 less than 1 in seven trillion. That level is adjusted every 2016 cubes, or roughly every 2 weeks, with the aim of keeping rates of mining constant.

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The opposite is also correct. If computational power is taken off of the network, the problem adjusts downward to earn mining easier. .

"Say I tell three friends that I'm thinking about 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 exact number, they just have to be the first person to guess any number that is less than or equal to the number I'm thinking of.

"Let us say I'm thinking of the number 19. If Friend A guesses 21they shed because 21>19. If Friend B supposes 16 and Friend C supposes 12, then they've both theoretically arrived at viable answers, because 16<19 and 12<19. There is no'extra credit' for Friend B, even though B's answer was closer to the target answer of 19. .

"Now imagine that I pose the'imagine what number I'm thinking of' question, but I'm not asking just 3 friends, and I am not thinking of a number between 1 and 100. Instead, I am asking millions of prospective miners and I am thinking about a 64-digit hexadecimal number. Now you see that it's going to be extremely hard to guess the right answer." .

If 1 in 7 trillion doesn't sound hard enough as is, here is the catch to the catch. Not only do bitcoin miners have to come up with the right hash, they also have to be the very first to perform it.

Because bitcoin mining is essentially guesswork, arriving at the ideal answer before another miner has almost everything to do with how fast your computer can create hashes. Just a decade ago, bitcoin miners find out can be performed competitively on normal desktop computers. As time passes, however, miners realized that pictures cards commonly used for video games tend to be more effective at mining than desktops and graphics processing units (GPU) came to dominate the match.

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

Nowadays, bitcoin mining is so aggressive that it can only be done profitably with the most up-to-date ASICs. When using desktop computers, GPUs, or elderly versions of ASICs, the expense of energy consumption actually exceeds the revenue generated. Even with the newest unit at your disposal, one computer is rarely enough to compete with what what miners call"mining pools" .

A mining pool is a group of miners that combine their computing power and split the mined bitcoin between participants. A disproportionately large number of cubes are mined by pools rather than by individual miners. In July 2017, mining pools and companies represented approximately 80% to 90 percent 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 confirmed roughly every 10 minutes. However, its important to remember that 10 minutes is a target, not a guideline.

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The bitcoin network can process about seven transactions per second, with transactions being logged in the blockchain each 10 minutes. As the network of bitcoin consumers continues to grow, however, the number of transactions made in 10 minutes will eventually exceed the number of transactions which can be processed in 10 minutes.