# The Big Coins PDFs

In 2009it had been 50. In 2013, it had been 25, in 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 have to happen. First, they need to confirm 1 megabyte (MB) value of transactions, which can theoretically be as little as 1 transaction but are more often several thousand, depending on how much information each transaction stores.

Second, in order to put in a block of transactions to the blockchain, miners should solve a complex computational science difficulty, also called a"proof of work." What they're doing is trying to come up with 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 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 1 in 7,184,404,942,701 less than 1 in seven trillion. That amount is adjusted every 2016 blocks, or about every 2 weeks, with the aim of keeping rates of mining constant.

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The reverse is also correct. If computational power has been taken from this network, the problem adjusts downward to earn mining simpler. .

"Say I tell three friends that I'm thinking about a number between 1 and 100, and 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 just must 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 supposes 16 and Friend C supposes 12, then they've both theoretically arrived at workable answers, because 16<19 and 12<19. There's no'extra credit' for Friend B, even though B's answer was nearer to the target answer of 19. .

"Now imagine that I pose the'imagine what number I'm thinking of' question, however I'm not asking only 3 friends, and I am not thinking of a number between 1 and 100. Instead, I'm asking millions of would-be miners and I'm 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 have a peek here sound difficult enough as is, here's the catch to the grab. Not only do bitcoin miners need to come up with the right hash, but they also must be the very first to perform it.

Since 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. Only a decade ago, bitcoin miners can be performed competitively on normal desktop computers. As time passes, however, miners realized that graphics cards commonly utilized 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. .

Nowadays, 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 surpasses the revenue generated. Even with the newest unit at your disposal, one computer is rarely enough to compete with what what miners call"mining pools." .

A mining pool is a group of miners who combine their computing power and split 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 the massive network of consumers verifying transactions, one block of transactions is confirmed roughly every 10 minutes. But its important to keep in mind that 10 minutes is a target, not a rule.

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The bitcoin look at these guys network can process about seven transactions per second, with transactions being logged in the blockchain each 10 minutes. Since the network of bitcoin users 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.