# The 7-Minute Rule for Master Coin

In 2009it was 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 entire 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 make.

Here's the catch. In order for bitcoin miners to actually earn bitcoin from verifying transactions, two things have to occur. To begin with, they must verify 1 megabyte (MB) worth of transactions, which can technically be as small 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 must fix a intricate computational science difficulty, also referred to as a"proof of work." What they're actually doing is trying to think of a 64-digit hexadecimal number, called a"hash," that is less than or equal to the hash.

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 goal is just 1 in 7,184,404,942,701 less than 1 in seven trillion. That level is corrected every 2016 blocks, or about every two 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 make mining simpler. .

"Say I tell three friends that 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 specific number, they directory simply must be the very first person to guess any number that is less than or equal to the number I am thinking of.

"Let's say I'm thinking of the number 19. If Friend A guesses 21, they lose because 21>19. If Friend B supposes 16 and Friend C supposes 12, then they have both theoretically arrived at workable answers, since 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 pose the'guess what number I am thinking of' question, however I'm not asking just three friends, and I am not thinking of a number between 1 and 100. Rather, I am asking millions of would-be miners and I am thinking about 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's the catch his explanation to the catch. Not only do bitcoin miners have to come up with the right hash, they also must be the very 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 create hashes. Only a decade ago, bitcoin miners could be carried out competitively on normal desktops. As time passes, however, miners recognized 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.

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

Nowadays, bitcoin mining is so aggressive it can only be done profitably using all the most up-to-date ASICs. When using desktop computers, GPUs, or older models of ASICs, the expense of energy consumption actually exceeds the revenue generated. Even with the newest unit at your disposal, one pc is seldom enough to compete with what what miners call"mining pools." .

An mining pool is a group of miners that combine their computing ability and divide 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% of bitcoin computing power. .

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Between 1 in 7 trillion chances, scaling difficulty levels, and also the massive network of users 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 rule.