# Big Coins Things To Know Before You Get This

In 2009it was 50. In 2013, it was 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 expensive for miners to make.

Here is the catch. In order for bitcoin miners to really earn bitcoin from verifying transactions, two things have to occur. First, they need to verify 1 megabyte (MB) value of transactions, which can theoretically be as small as 1 transaction but are far more often several thousand, depending on how much data each transaction shops.

Second, in order to add a block of transactions to the blockchain, miners should solve a intricate computational science difficulty, also called a"proof of work" What they're 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.

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 computer producing a hash below the target is 1 in 7,184,404,942,701 less than 1 in seven trillion. That level is corrected 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 off of the network, the problem adjusts downward to earn 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 just have to be the very first person to figure any number that is less than or equal to the number I'm thinking of.

"Let's say I'm thinking about the number 19. If Friend A guesses 21, they shed because 21>19. If Friend B supposes 16 and Friend C guesses 12, then they have both technically came at viable answers, since 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 present the'imagine what number I am thinking of' question, but I'm not asking just 3 friends, and I am not thinking of a number between 1 and 100. Rather, I'm asking millions of next would-be miners and I am 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 7 trillion doesn't sound hard enough as is, here is the grab to the catch. Not only do bitcoin miners have to come up with the ideal hash, but 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 performed competitively on normal desktop computers. As time passes, however, miners recognized that graphics cards commonly utilized for video games were 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 aggressive it can only be done profitably with all the latest up-to-date ASICs. When using desktop computers, GPUs, or older models of ASICs, the cost of energy consumption actually exceeds the revenue generated. Even with the newest unit available, one pc is rarely enough to compete with exactly what miners call"mining pools." .

An mining pool is a group of miners that combine their computing power and divide the mined bitcoin between participants. A disproportionately high 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 chances, scaling difficulty levels, and also the massive network of users 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 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 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.