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In 2009it was 50. In 2013, it was 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 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 produce.

Here is the catch. In order to get bitcoin miners to really earn bitcoin from verifying transactions, two things must happen. To begin with, they must verify 1 megabyte (MB) value of transactions, which can theoretically be as little 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're actually 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 is a bet. .

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 below the target is 1 in 7,184,404,942,701 less than 1 in seven trillion. That level is adjusted every 2016 blocks, or roughly every two weeks, with the aim of keeping rates of mining constant.

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The reverse is also correct. If computational power is taken off of this network, the difficulty adjusts downward to make mining easier. .

"Say I tell three friends that I'm thinking of 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 simply must be the very first person to figure any number that is less than or equal to this number I am thinking of.

"Let us say I'm thinking about 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 theoretically arrived at workable answers, because 16<19 and 12<19. There's no'extra credit' for Friend B, even though B's answer was nearer to the target answer of 19. .

"Now imagine that I pose the'imagine what number I am thinking of' question, however I am 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'm thinking about a 64-digit hexadecimal number. Now you see that it's going to be quite difficult to guess the right answer." .

If 1 in seven trillion doesn't sound hard enough as is, here's the catch to the grab. Not only do bitcoin miners need to come up with the ideal hash, but they also have to be the first to perform 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 could be performed 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.

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

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

A mining pool is a group of miners that combine their computing 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 consumers 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.