# How How To Trade Bitcoin can Save You Time, Stress, and Money.

In 2009it was 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 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 expensive for miners to make.

Here's the catch. In order for bitcoin miners to actually earn bitcoin from verifying transactions, two things must happen. First, they must verify 1 megabyte (MB) worth of transactions, which can theoretically be as small as 1 transaction but are more often a few thousand, depending on how much information each transaction stores.

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Second, in order to add a block of transactions to the blockchain, miners must fix a intricate computational math problem, also called a"proof of work." What they are actually doing is trying to think of a 64-digit hexadecimal number, called a"hash," that is 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 all about 7,184,404,942,701. That is, the chance of a computer producing a hash beneath the target is 1 in 7,184,404,942,701 less than 1 in 7 trillion. That level is adjusted every 2016 blocks, or about every 2 weeks, with the aim of keeping rates of mining constant.

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The opposite is also correct. If computational power has been taken from the network, the difficulty adjusts downward to make mining easier. .

"Say I tell three friends 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 have to guess the specific number, they simply must Continued be the first person to guess any number that is less than or equal to this number I'm thinking of.

"Let us say I am thinking of the number 19. If Friend A guesses 21, they shed because 21>19. If Friend B supposes 16 and Friend C supposes 12, then they have both technically came at look here workable answers, since 16<19 and 12<19. There's no'extra credit' for Friend B, even though B's answer was nearer to the goal answer of 19. .

"Now imagine that 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's going to be extremely hard to guess the ideal answer." .

If 1 in seven trillion doesn't sound hard enough as is, here's the catch to the catch. Not only do bitcoin miners need 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 everything to do with how fast original site your computer can create hashes. Only a decade ago, bitcoin miners could be performed competitively on normal desktops. As time passes, however, miners recognized that graphics cards commonly used for video games were more effective at mining than desktops and graphics processing units (GPU) came to dominate the game.

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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 most up-to-date ASICs. When using desktop computers, GPUs, or elderly models of ASICs, the expense 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." .

An mining pool is a group of miners that combine their computing ability and split 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 roughly 80% to 90% of bitcoin computing power. .

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Between 1 in 7 trillion odds, scaling difficulty levels, and also the huge network of users verifying transactions, one block of transactions is verified roughly every 10 minutes. However, its important to keep in mind that 10 minutes is a target, not a guideline.

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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.