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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 imitation one, someone that took the trouble of looking at both of the invoices' consecutive numbers would observe that they had been exactly the same number, and consequently one of them needed to be fictitious.

This isn't a great 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 can be an issue of controversy, as some miners believe the block size ought to be increased to accommodate more information.

Note that I stated that verifying 1 MB worth of transactions makes a miner qualified to earn Bitcoin--not everyone who supports transactions will get paid off.

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 consume.

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 must be the first miner to arrive at the right answer to some 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 heard that miners are solving difficult mathematical problems--that's not true at all. 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 equal to the hash.

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The bad news: Since it is guesswork, you need a good deal of computing power in order to get there first. To mine , you need to have a higher"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 just how much Bitcoin you could mine with your mining rig's hash rate, the website Cryptocompare offers a helpful calculator.

Either a GPU (graphics processing unit) miner or an application-specific integrated circuit (ASIC) miner. These can run from $500 into the tens of thousands.  Some miners--especially Ethereum miners--purchase individual graphics cards (GPUs) as a low-cost way to cobble together mining operations.  The photo 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 into the metal rod.

Case in point : I tell three friends that I'm thinking of 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 have to guess the specific number, they simply must be the very first person to figure any number that is less than or equal to this number I am thinking of.

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Let's say I am thinking about the number 19. If Friend A guesses 21they shed because 21>19. If Friend B guesses 16 and Friend C supposes 12, then they have both theoretically arrived at workable 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. .

In Bitcoin terms, simultaneous answers happen frequently, but at the end of the day there can moved here 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 decide by a simple majority--51%--which miner to honour. Normally, it's the miner that has done the most work, i.e. look what i found

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The losing block then becomes an"orphan block." .

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Now imagine that I present the"guess what number I am thinking of" question, but I am not asking just 3 friends, and I am not thinking of a number between 1 and 100. Rather, I am asking millions of would-be miners and I am thinking about a 64-digit hexadecimal number. Now you see that it's going to be quite hard to guess the ideal answer.

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The number above has 64 digits. Easy enough to understand so far. 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 term"hexadecimal."

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

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