# Getting The Big Coins To Work

In 2009it was 50. In 2013, it had been 25, at 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 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 produce.

Here's the catch. In order for bitcoin miners to really earn bitcoin from verifying transactions, two things must happen. First, they must confirm 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 solve a complex computational science difficulty, also referred to as a"proof of labour ." What they are actually doing is trying to come up with a 64-digit hexadecimal number, called a"hash," that's less than or equal to the 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. In other words, the chance of a pc producing a hash below the goal is 1 in 7,184,404,942,701 less than 1 in 7 trillion. That amount is adjusted every 2016 blocks, or about every 2 weeks, with the goal of keeping rates of mining constant.

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

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

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

"Now imagine I pose the'imagine what number I am thinking of' question, but I'm not asking just three friends, and I am not thinking of a number between 1 and 100. Rather, I am asking millions of would-be miners and I'm thinking of a 64-digit hexadecimal number. Now you see that it's going to be extremely hard to guess the right answer." .

If 1 in seven trillion doesn't sound difficult enough as is, here is the catch to the grab. Not only do bitcoin miners need to come up with the ideal hash, they also have to be the very first to do 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. Just a decade ago, bitcoin miners can be carried out competitively on normal desktops. As time passes, however, miners realized that graphics cards commonly used for video games were more capable of mining than desktops and graphics processing units (GPU) came to dominate the match.

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

Today, bitcoin mining is so aggressive that it can only be done profitably with all the most up-to-date ASICs. When using desktop computers, GPUs, or older versions of ASICs, the cost of energy consumption actually exceeds the revenue generated. Even with the newest unit available, one computer is seldom 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 large number of blocks 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 consumers 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 rule.

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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 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 site link minutes.