# Some Known Facts About Big Coins.

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 rate of halving, the total number of bitcoin in circulation will approach a limit of 21 million, making the currency more scarce and valuable over time but also more costly for miners to produce.

Here is the catch. In order to get bitcoin miners to really earn bitcoin from verifying transactions, two things must happen. First, they need to confirm 1 megabyte (MB) worth of transactions, which can technically be as small as 1 transaction but are more often several thousand, depending on how much data each transaction stores.

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Second, in order to add a block of transactions to the blockchain, miners must solve a intricate computational science difficulty, also called a"proof of labour ." What they're doing is trying to think of a 64-digit hexadecimal number, called a"hash," that's less than or equivalent 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 about every 2 weeks, with the goal of keeping rates of mining constant.

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The reverse is also true. If computational power is taken off of this network, the difficulty adjusts downward to make mining easier. .

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

"Let's say I am thinking about 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've both technically came 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 target answer of 19. .

"Now imagine I pose the'imagine what number I'm thinking of' question, but I am not asking only three friends, and I'm not thinking of a number between 1 and 100. Rather, I am asking millions of prospective miners and I am 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 difficult enough as is, here's the catch to the catch. Not only do bitcoin miners have to come up with the ideal hash, they also have to be the very first to perform it.

Because bitcoin mining is essentially guesswork, arriving at the ideal answer before another miner has everything to do with how fast your computer can produce hashes. Just a decade ago, bitcoin miners could be carried out competitively on normal desktop computers. As time passes, however, miners realized that graphics cards commonly used for video games tend to be more effective at 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 aggressive it can only be done profitably with all the latest up-to-date ASICs. When using desktop computers, GPUs, or elderly models of ASICs, the cost 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 who combine their computing ability and divide 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. .

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. Full Article However, its important to keep in mind that 10 minutes is a goal, 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, but the number of transactions made in 10 minutes will eventually exceed the number of transactions that can be processed in 10 minutes.