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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 true bill and the fake one, someone that took the trouble of looking at both of those bills' consecutive numbers would observe that they had been exactly the same number, and thus one of them needed to be false.

This isn't a great analogy--we'll explain in more detail below. .

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

Note that I stated that verifying 1 MB value of transactions makes a miner eligible to earn Bitcoin--not everyone who supports transactions will receive paid out.

1MB of transactions can technically be small as 1 transaction (though this is not at all common) or several thousand. It depends on how much data the transactions take up.

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

2) You have to be the first miner to arrive at the right answer to a numeric problem. This process is also known as a proof of work.

The good news: No advanced math or computation is involved. You may have discovered that miners are solving challenging mathematical problems--that is not true in any way. What they are actually doing is trying to be the first miner to come up with a 64-digit hexadecimal number (a"hash")  that is less than or equal to the target hash.

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

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

Either way 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--buy individual graphics cards (GPUs) as a low-cost method to cobble together mining operations.  The photograph below is a makeshift, home-made mining machine.  The graphics cards are such rectangular cubes with whirring circles.  Note the sandwich twist-ties holding the pictures cards to the metal rod.

ExampleI tell three friends that 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 need to guess the exact number, they simply must be the very first person to Learn More Here figure any number that's less than or equal to the number I'm thinking of.

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Let's say I am thinking of the number 19. If Friend A guesses 21, they shed because 21>19. If Friend B guesses 16 and Friend C supposes 12, then they have both theoretically arrived at viable answers, because 16<19 and 12<19. There's no"extra credit" for Friend B, even though B's answer was nearer to the goal answer of 19. .

In Bitcoin conditions, simultaneous answers occur frequently, but at the end of the day there can only be one winning answer. When multiple simultaneous answers are presented which can be equivalent to or less than the target number, the Bitcoin network will determine by a simple majority--51%--which miner to honour. Normally, it is the miner who has done the most work, i.e.

The losing block then becomes an"orphan block" .

Now imagine I present the"figure 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 would-be miners and I'm thinking of a 64-digit hexadecimal number. Now you see that it's going to be quite difficult to guess the right answer.

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The number preceding index has 64 digits. Easy enough to understand up to now. As you likely noticed, that number consists not just of numbers, but also letters of the alphabet. Why is that

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

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