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In 2009, it had been 50. In 2013, it had been 25, in 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 costly for miners to produce.
Here is the catch. In order to get bitcoin miners to actually earn bitcoin from verifying transactions, two things must happen. To begin with, they must confirm 1 megabyte (MB) worth of transactions, which can theoretically be as small as 1 transaction but are far more often a few thousand, depending on how much data each transaction shops.
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Second, in order to add a block of transactions to the blockchain, miners must solve a complex computational math problem, 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's 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 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 seven trillion. That amount is corrected every 2016 cubes, or roughly every two weeks, with the goal of keeping rates of mining constant.
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The opposite is also true. If computational power has been taken off of the network, the difficulty adjusts downward to earn mining easier. .
"Let us say I'm thinking about the number 19. If Friend A guesses 21, they lose because 21>19. If Friend B supposes 16 and Friend C guesses 12, then they've both technically came at workable answers, because 16<19 and 12<19. There's no'extra credit' for Friend B, even though B's answer was closer to the goal answer of 19. .
"Now imagine that I present the'guess what number I am thinking of' question, but I am not asking only three friends, and I am not thinking of a number between 1 and 100. Rather, 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 hard to guess the ideal answer." .
If 1 in 7 trillion doesn't sound hard enough as is, here's the grab to the grab. Not only do bitcoin miners need to think of the right hash, they also have to be the first to perform Click Here it.
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These can run from $500 to the tens of thousands. .
Today, bitcoin mining is so competitive it can only be done profitably with all the latest up-to-date ASICs. When using desktop computers, GPUs, or older models 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 what what miners call"mining pools" .
An mining pool is a group of miners who combine their computing power 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 Website pools and companies represented roughly 80% to 90 percent 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 keep in mind 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 every 10 minutes. As 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.