# The 8-Minute Rule for How To Trade Bitcoin

In 2009, it was 50. In 2013, it had been 25, at the time of writing it's 12.5, and sometime in the center 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 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 occur. First, they must confirm 1 megabyte (MB) worth of transactions, which can theoretically be as small as 1 transaction but are more often several thousand, depending on how much information each transaction stores.

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Second, in order to put in a block of transactions to the blockchain, miners must fix a complex computational math problem, also called a"proof of labour ." What they're doing is trying to think of a 64-digit hexadecimal number, known as a"hash," that is less than or equivalent to the target hash.

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In other words, it's a gamble. .

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 goal is 1 in 7,184,404,942,701 less than 1 in 7 trillion. That level is adjusted every 2016 cubes, or about every 2 weeks, with the aim of keeping rates of mining constant.

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

"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 specific number, they just must be the very first person to figure any number that's less than or equal to the number I'm thinking of.

"Let us say I'm thinking of the number 19. If Friend A guesses 21they shed because 21>19. If Friend B guesses 16 and Friend C guesses 12, then they have both theoretically Coins For Sale arrived at viable answers, because 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'guess what number I'm 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'm 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 ideal answer." .

If 1 in 7 trillion doesn't sound hard enough as is, here's the catch to the grab. Not only do bitcoin miners have to come up with the ideal hash, but they also have to be the first to do it.

Since bitcoin mining is essentially guesswork, arriving at the ideal answer before another miner has everything to do with how fast your computer can create hashes. Only a decade ago, bitcoin miners could be carried out competitively on normal desktop computers. Over time, however, miners recognized that pictures cards commonly used 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 to the tens of thousands. .

Today, bitcoin mining is so competitive that it can only be done profitably using the latest up-to-date ASICs. When using desktop computers, GPUs, or elderly versions of ASICs, the cost of energy consumption actually surpasses the revenue generated. Even with the newest unit at your disposal, one pc is seldom enough to compete with exactly what miners call"mining pools" .

A mining pool is a group of miners who combine their computing power and divide 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 percent of bitcoin computing power. .

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Between 1 in 7 trillion chances, 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 keep in mind that 10 minutes is a target, not a rule.