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Let's say you had one legit $20 and one really good photocopy of that same $20. If someone were to try to spend both the real bill and the imitation one, someone that took the trouble of looking at either of those bills' consecutive numbers would see that they had been exactly the same number, and thus one of them needed to be false.

That isn't a perfect analogy--we'll explain in more detail below. .

Once a miner has verified 1 MB (megabyte) worthiness of Bitcoin transactions, they are eligible to win the 12.5 BTC. The 1 MB limit was established by Satoshi Nakamoto, and is an issue of controversy, as some miners think the block size should be increased to accommodate more information.

Note that I said that verifying 1 MB worth of transactions makes a miner eligible to earn Bitcoin--not everyone who verifies transactions will get paid out.

1MB of transactions can theoretically be as small as 1 transaction (although this is not in any way common) or a few thousand. It depends on how much information the transactions take up.

In order to earn Bitcoin, you need to meet two conditions. One is a matter of work, one is a matter of luck.

2) You have to be the first miner to reach the perfect answer to some numeric problem. This process is also known as a proof of work.

The fantastic news: No advanced math or computation is involved. You might have discovered that miners are solving difficult mathematical problems--that is not true in any way. What they're actually doing is trying to be the first miner to think of a 64-digit hexadecimal number (a"hash")  that is less than or equivalent to the target hash.

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The bad news: Because it's guesswork, you need a lot of computing power in order to get there . To mine successfully, you need to have a high"hash rate," that is measured in terms of megahashes per second (MH/s), gigahashes per second (GH/s), and terahashes per second (TH/s).

If you want to estimate how much Bitcoin you can mine with your mining rig's hash rate, the website Cryptocompare provides a very helpful calculator.

Either a GPU (graphics processing unit) miner or an application-specific integrated circuit (ASIC) miner. These can run from $500 to the tens of thousands.  Some miners--especially Ethereum miners--purchase individual graphics cards (GPUs) as a cheap method to cobble together mining operations.  The photo below is a makeshift, home-made mining machine.  The graphics cards are those rectangular blocks with whirring circles.  Note the sandwich twist-ties holding the pictures cards into the metal rod.

ExampleI tell three friends that I'm thinking about 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 need to guess the specific helpful site number, they simply have to be the first person to guess any number that's less than or equal to this number I am thinking of.

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Let us say I'm thinking about the number 19. If Friend A guesses 21, they lose because 21>19. If Friend B guesses 16 and Friend C supposes 12, then they've both Visit This Link theoretically arrived at workable answers, because 16<19 and 12<19. There is no"extra credit" for Friend B, even though B's answer was closer to the goal answer of 19. .

In Bitcoin conditions, simultaneous answers happen frequently, but at the end of the day there can only be one winning answer. When multiple simultaneous answers are presented which can be equal to or less than the target number, the Bitcoin network will decide by a simple majority--51 percent --which miner to honour. Normally, it's the miner that has done the work, i.e.

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The losing block then becomes an"orphan block" .

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Now imagine I pose the"guess what number I'm thinking of" question, but I am not asking only 3 friends, and I am not thinking of a number between 1 and 100. Instead, 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.

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The number above has 64 digits. Easy enough to understand so far. As you probably noticed, that number consists not just of numbers, but also letters of this alphabet. Why is that

In order to understand what these letters are doing in the middle of numbers, let us unpack the term"hexadecimal."

As you knowwe utilize the"decimal" system, which means it is base 10. This in turn means that each and every digit has 10 chances, 0-9.

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