# The 6-Minute Rule for Big Coins

In 2009, it had been 50. In 2013, it was 25, at the time of writing it is 12.5, and sometime in the middle 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 make.

Here's the catch. In order for bitcoin miners to actually earn bitcoin from verifying transactions, two things must occur. To begin with, they need to verify 1 megabyte (MB) value of transactions, which can technically be as little as 1 transaction but are far 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 should solve a complex computational science difficulty, also referred to as a"proof of work." What they are 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. 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 level is corrected every 2016 blocks, 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 from the network, the difficulty adjusts downward to earn mining simpler. .

"Say I tell three friends I'm thinking of 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 need to guess the exact number, they simply have to be the first person to guess any number that's less than or equal to the number I am thinking of.

"Let us say I'm thinking of the number 19. If Friend A guesses 21, they shed because 21>19. If Friend B supposes 16 and Friend C supposes 12, then they've both technically came at workable answers, since 16<19 and 12<19. There is no'extra credit' for Friend B, even though B's answer was closer to the target answer of 19. .

"Now imagine that I pose the'guess what number I'm thinking of' question, but I'm not asking only 3 friends, and I'm 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 difficult to guess the right answer." .

If 1 in seven trillion doesn't sound difficult enough as is, here is the catch to the catch. Not only do bitcoin miners have to think of the right hash, they also have to be the first to do it.

Because bitcoin mining is essentially guesswork, arriving at the right answer before another miner has everything to do with how fast your computer can produce hashes. Only a decade ago, bitcoin miners could be carried out competitively on normal desktop computers. As time passes, 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 match.

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These can run from \$500 to the tens of thousands. .

Today, bitcoin mining is so competitive that it can only be done profitably using all the latest up-to-date ASICs. When using desktop computers, GPUs, or elderly versions of ASICs, the cost of energy consumption actually surpasses the revenue generated. Even with the newest unit available, one pc is seldom enough that site 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 blocks 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 chances, scaling difficulty levels, and also the massive network of consumers verifying transactions, one block of transactions is confirmed roughly every 10 minutes. But its important to remember that 10 minutes is a target, not a rule.