# The Definitive Guide for Trading Bitcoin Futures

In 2009it 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 speed of halving, the entire 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 make.

Here's the catch. In order to get bitcoin miners to really earn bitcoin from verifying transactions, two things must happen. First, they must verify 1 megabyte (MB) value of transactions, which can theoretically be as small as 1 transaction but are more often several 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 must solve a intricate computational science difficulty, also referred to as a"proof of labour " What they're actually doing is trying to come up with a 64-digit hexadecimal number, known as a"hash," that's less than or equivalent to the hash.

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In other words, it is 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 pc producing a hash below the target is just 1 in 7,184,404,942,701 less than 1 in seven trillion. That amount is adjusted every 2016 cubes, or roughly every two weeks, with the goal of keeping rates of mining constant.

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The reverse is also true. If computational power is taken off of the network, the difficulty adjusts downward to earn mining easier. .

"Say I tell three friends I'm thinking of a number between 1 and 100, and I write that number on a piece of paper and seal it in an envelope. My friends don't need to guess the specific number, they just have to be the very first person to figure any number that's less than or equal to the number I'm thinking of.

"Let's 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 guesses 12, then they have both theoretically arrived at viable answers, because 16<19 and 12<19. There is no'extra credit' for Friend B, even though B's answer was closer to the target answer of 19. .

"Now imagine that I pose the'imagine what number I am thinking of' question, however 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 would-be miners and I am thinking of a 64-digit hexadecimal number. Now you see that it's going to be quite hard to guess the ideal answer." .

If 1 in seven trillion doesn't sound hard enough as is, here's the grab to the catch. Not only do bitcoin miners have to think of the ideal hash, they also must be the first to do it.

Because bitcoin mining is essentially guesswork, arriving at the ideal answer before another miner has everything to do with how fast your computer can produce hashes. Just go to the website a decade ago, bitcoin miners can be performed competitively on normal desktop computers. Over time, however, miners recognized that graphics cards commonly utilized for video games tend to be 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 with the latest up-to-date ASICs. When using desktop computers, GPUs, or older versions of ASICs, the cost of energy consumption actually surpasses the revenue generated. Even with the newest unit available, one pc is seldom enough to compete with exactly 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 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 odds, scaling difficulty levels, and the massive network of users verifying transactions, one block of transactions is verified roughly every 10 minutes. But its important to remember that 10 minutes is a goal, not a guideline.