# How To Trade Bitcoin - Questions

In 2009, it had been 50. In 2013, it was 25, in 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 precious 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. To begin with, they need to confirm 1 megabyte (MB) value 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 shops.

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Second, in order to put in a block of transactions to the blockchain, miners must solve a complex computational math problem, also called a"proof of labour " What they are doing is trying to come up with a 64-digit hexadecimal number, known as a"hash," that's less than or equal 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. That is, the chance of a computer producing a hash beneath the goal 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 correct. If computational power has been taken from 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 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 be the first person to figure any number that's less than or equal to this number I am learn this here now 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 guesses 16 and Friend C guesses 12, then they have both technically came at viable answers, since 16<19 and 12<19. There is no'extra credit' for Friend B, even though B's answer was nearer to the goal answer of 19. .

"Now imagine 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. Rather, I'm asking millions of would-be miners and I'm thinking about a 64-digit hexadecimal number. Now you see that it's going to be extremely difficult to guess the right answer." .

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

Because bitcoin mining is essentially guesswork, arriving at the right answer before another miner has almost everything to do with how fast your computer can produce hashes. Only a decade ago, bitcoin miners can be carried out competitively on normal desktop computers. Over time, however, miners realized that pictures cards commonly utilized for video games tend to be more capable of mining than desktops and graphics processing units (GPU) came to dominate the game.

These can run from \$500 to the tens of thousands. .

Today, 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 elderly models of ASICs, the cost of energy consumption actually exceeds the revenue generated. Even with the newest unit available, one pc is seldom enough to compete with what what miners call"mining pools" .

An mining pool is a group of miners that 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 also the massive network of consumers verifying transactions, one block of transactions is verified roughly every 10 minutes. But its important to keep in mind that 10 minutes is a goal, not a guideline.