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In 2009, it had been 50. In 2013, it had been 25, at the time of writing it's 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 is the catch. In order for bitcoin miners to actually earn bitcoin from verifying transactions, two things have to occur. First, they need to verify 1 megabyte (MB) value of transactions, which can technically 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 put in a block of transactions to the blockchain, miners must fix a complex computational science difficulty, also called a"proof of work" What they're actually doing is trying to think of a 64-digit hexadecimal number, known as a"hash," that is less than or equivalent to the 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 all about 7,184,404,942,701. In other words, the chance of a pc producing a hash below the target is 1 in 7,184,404,942,701 less than 1 in seven 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 reverse is also true. If computational power has been taken off of this network, the difficulty adjusts downward to earn mining simpler. .

"Let us 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 guesses 12, then they have both theoretically arrived at workable answers, since 16<19 and 12<19. There is 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'guess what number I am thinking of' question, however I'm not asking just 3 friends, and I am not thinking of a number between 1 and 100. Instead, I'm asking millions of would-be miners and I am thinking of 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 hard enough as is, here's the grab to the catch. Not only do bitcoin miners have to come up with the right hash, but they also have to be the very first to do it.

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These can run from $500 into the tens of thousands. .
Nowadays, bitcoin mining is so competitive it can only be done profitably with all the most up-to-date ASICs. When using desktop computers, GPUs, or older 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 what what miners call"mining pools" .
A mining pool is a group of miners who combine their computing ability and split the mined bitcoin between participants. A disproportionately high 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 huge network of consumers verifying transactions, one block of transactions is verified roughly every 10 minutes. However, its important to remember 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. Since the network of bitcoin users 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.