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In 2009it had been 50. In 2013, it had been 25, in 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 expensive for miners to make.

Here is the catch. In order to get bitcoin miners to really earn bitcoin from verifying transactions, two things have to occur. To begin with, they need to verify 1 megabyte (MB) value of transactions, which can technically be as little as 1 transaction but are more often several thousand, depending on how much data each transaction stores.

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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 called a"proof of labour " What they are doing is trying to come up with a 64-digit hexadecimal number, known as a"hash," that is less than or equal to the target hash.

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In other words, it's a bet. .

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 target is just 1 in 7,184,404,942,701 less than 1 in 7 trillion. That level is corrected every 2016 cubes, or about every two weeks, with the aim of keeping rates of mining constant.

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

"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 have to guess the specific number, they just must be the first person to figure any number that is less than or equal to this number I am thinking of.

"Let's say I'm thinking about the number 19. If Friend A guesses 21, they lose because 21>19. If Friend B guesses 16 and Friend C supposes 12, then they have 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 nearer to the goal answer of 19. .

"Now imagine I present the'guess what number I'm thinking of' question, however I am not asking only 3 friends, and I'm not thinking of a number between 1 and 100. Instead, I am asking millions of would-be miners and I'm thinking about a 64-digit hexadecimal number. Now you see that it is going to be quite difficult to guess the right answer." .

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

Since bitcoin mining is essentially guesswork, arriving at the right answer before another miner has almost everything to do with how fast your computer can create hashes. Only a decade ago, bitcoin miners could be carried out competitively on normal desktops. As time passes, 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 to the tens of thousands. .

Nowadays, bitcoin mining is so competitive it can only be done profitably using the most up-to-date ASICs. When using desktop computers, GPUs, or elderly models of ASICs, the expense of energy consumption actually surpasses the revenue generated. Even with the newest unit available, one computer is rarely enough to basics compete with what what read miners call"mining pools." .

An mining pool is a group of miners that combine their computing ability and divide 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 consumers verifying transactions, one block of transactions is verified roughly every 10 minutes. But 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. 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 which can be processed in 10 minutes.