# Our Big Coins Diaries

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 expensive for miners to make.

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 need to confirm 1 megabyte (MB) value of transactions, which can theoretically be as little as 1 transaction but are 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 fix a complex computational science difficulty, also referred to as a"proof of labour " What they are doing is trying to think of 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 beneath the target is just 1 in 7,184,404,942,701 less than 1 in 7 trillion. That amount is corrected every 2016 cubes, or roughly every two weeks, with the aim of keeping rates of mining constant.

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The reverse is also correct. If computational power is taken off of the network, the difficulty adjusts downward to earn mining simpler. .

"Say I tell three friends I'm thinking about a number between 1 and 100, and that I write that number on a piece of paper and seal it in an envelope. My friends don't have to guess the exact number, they simply have to be the very first person to guess any number that's less than or equal to the number I'm thinking of.

"Let us say I am thinking of 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 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 goal answer of 19. .

"Now imagine I pose the'guess what number I'm thinking of' question, however I'm not asking only three friends, and I'm not thinking of a number between 1 and 100. Instead, I'm asking millions of prospective miners and I'm thinking about 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 is the grab to the grab. Not only do bitcoin miners have to think of the ideal hash, they also must be the first to perform it.

Because bitcoin mining is essentially guesswork, arriving at the ideal answer before another miner has almost everything to do with how fast your computer can create hashes. Just a decade ago, bitcoin miners can be performed competitively on normal desktops. As time passes, however, miners realized that pictures cards see it here commonly utilized for video games were more capable of mining than desktops and graphics processing units (GPU) came to dominate the game.

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

Today, 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 elderly models of ASICs, the cost of energy consumption actually surpasses the revenue generated. Even with the newest unit available, one computer is seldom 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 roughly 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 remember that 10 minutes is a target, not a guideline.