In 2009it was 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 speed of halving, the total 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 produce.

Here's the catch. In order for bitcoin miners to really earn bitcoin from verifying transactions, two things have to happen. First, they need to confirm 1 megabyte (MB) value of transactions, which can theoretically be as little as 1 transaction but are far more often several 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 complex computational science difficulty, also referred to as a"proof of work." What they are doing is trying to think of a 64-digit hexadecimal number, called a"hash," that's less than or equivalent to the target 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. That is, the chance of a computer producing a hash below the target is just 1 in 7,184,404,942,701 less than 1 in 7 trillion. That amount is corrected every 2016 blocks, or roughly every 2 weeks, with the goal of keeping rates of mining constant.

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The reverse is also correct. If computational power is taken from 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 sheet of paper and seal it in an envelope. My friends don't have to guess the specific number, they just have to 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 am 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'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 nearer to the goal answer of 19. .

"Now imagine that I present the'guess what number I'm thinking of' question, but I am not asking only three 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 extremely hard to guess the ideal answer." .

If 1 in seven trillion doesn't sound difficult enough as is, here's the grab to the grab. Not only do bitcoin miners need to come up with the ideal 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 produce hashes. Only a decade ago, bitcoin miners can be carried out competitively on normal desktop computers. Over time, however, miners recognized that graphics cards commonly utilized 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 from \$500 into the tens of thousands. .

Nowadays, bitcoin mining is so competitive that it can only be done profitably using 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 available, one pc is seldom enough to compete with exactly what miners call"mining pools." .

An mining pool is a group of miners who 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 roughly 80% to 90% of bitcoin computing power. .

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Between 1 in 7 trillion odds, scaling difficulty levels, and the huge network of consumers verifying transactions, one block of transactions navigate to these guys is verified 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 network can process about seven transactions per second, with transactions being logged in the blockchain every 10 minutes. As 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 see this website be processed in 10 minutes.