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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 rate 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 must happen. To begin with, they need to 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 data each transaction stores.

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Second, in order to add a block of transactions to the blockchain, miners must fix a complex computational math problem, also called a"proof of work." What they're 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 all about 7,184,404,942,701. In other words, the chance of a computer producing a hash beneath the target is 1 in 7,184,404,942,701 less than 1 in 7 trillion. That amount 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 true. If computational power is taken from the network, the difficulty adjusts downward to make mining easier. .

"Say I tell three friends I'm thinking about a number between 1 and 100, and 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 have to be the very first person to figure any number that's less than or equal to the number I am thinking of.

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

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

If 1 in seven trillion doesn't sound hard enough as is, here's the grab to the catch. Not only do bitcoin miners need to think of the right hash, but they also must be the first to do 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 carried out competitively on normal desktops. As time passes, however, miners realized that graphics cards commonly utilized for video games tend to be more effective at 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. .

Today, bitcoin mining is so aggressive it can only be done profitably with the latest 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 rarely 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 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% of bitcoin computing power. .

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Between 1 in 7 trillion odds, 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 keep in mind that 10 minutes is a goal, 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 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.