# Big Coins - Questions

In 2009it 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 produce.

Here's the catch. In order for bitcoin miners to actually earn bitcoin from verifying transactions, two things have to occur. First, they must confirm 1 megabyte (MB) worth of transactions, which can theoretically be as little as 1 transaction but are far more often a few 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 should fix a complex computational math problem, also referred to as a"proof of work." What they are actually doing is trying to think of a 64-digit hexadecimal number, known as a"hash," that is less than or equivalent to the 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. In other words, the chance of a pc producing a hash beneath the target is 1 in 7,184,404,942,701 less than 1 in seven trillion. That level is corrected every 2016 cubes, 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 is taken off of this network, the problem adjusts downward to earn mining easier. .

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

"Let's say I am thinking of the number 19. If Friend A guesses 21, they shed because 21>19. If Friend B guesses 16 and Friend C guesses 12, then they've both theoretically arrived at viable 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 present the'imagine what number I am 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 am asking millions of prospective miners and I'm thinking of a 64-digit hexadecimal number. Now you see that it is going to be extremely hard to guess the right answer." .

If 1 in 7 trillion doesn't sound hard 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 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 produce hashes. Only a decade ago, bitcoin miners can be performed competitively on normal desktops. 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. .

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 older models of ASICs, the expense of energy consumption actually surpasses the revenue generated. Even with the newest unit available, one helpful hints pc is rarely enough to compete with what what miners call"mining pools" .

An mining pool is a group of miners who combine their computing power and divide the mined bitcoin between participants. A disproportionately high number of blocks are mined by pools rather than by individual miners. In July 2017, mining pools and companies represented roughly 80% to 90 percent of bitcoin computing power. .

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Between 1 in 7 trillion odds, scaling difficulty levels, and the massive network of users verifying transactions, one block of transactions is verified roughly every 10 minutes. However, its important to remember 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 each 10 minutes. As the network of bitcoin consumers 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.