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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 bills' consecutive numbers would observe that they were the exact same number, and thus one of them needed to be fictitious.

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

Once a miner has verified 1 MB (megabyte) worth of Bitcoin transactions, they are entitled to win the 12.5 BTC. The 1 MB limit was set by Satoshi Nakamoto, and can be a matter of controversy, as some miners believe the block size should be increased to accommodate more information.

Note that I said 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 little as 1 transaction (though this is not at all common) or several thousand. It depends on how much information the transactions consume.

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 perfect answer to a numeric problem. This practice is also known as an evidence of work.

The fantastic news: No advanced math or computation is involved. You might have discovered that miners are solving challenging mathematical problems--that is not true at all. What they are actually doing is trying to be the first miner to come up with a 64-digit hexadecimal number (a"hash")  which is less than or equivalent to the hash.

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The bad news: Because it is guesswork, you need a lot of computing power in order to get there first. To mine , you need to get a high"hash rate," which is quantified 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 along with your mining rig's hash rate, the website Cryptocompare offers a 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--purchase individual graphics cards (GPUs) as a cheap way to cobble together mining operations.  The photograph below is a makeshift, home-made mining machine.  The graphics cards are those rectangular cubes with whirring circles.  Note the sandwich twist-ties holding the pictures cards to the metal rod.

Case in point I tell three friends I'm thinking about a number between 1 and 100, and that I write that number on a sheet of paper and seal it in an envelope. My friends don't have to guess the exact number, they just have to be browse around here the very first person to figure any number that is less than or equal to the number I am thinking of.

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Let's say I'm thinking of the number 19. If Friend A guesses 21, they lose because 21>19. If Friend B go right here supposes 16 and Friend C supposes 12, then they've both theoretically arrived at workable 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 terms, simultaneous answers occur frequently, but in the end of the day there can only be one winning answer. When multiple simultaneous answers are presented that are equivalent to or less than the target number, the Bitcoin network will determine by a simple majority--51%--which miner to honour. Normally, it's the miner that has done the most work, i.e.

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The losing block then becomes an"orphan block" .

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Now imagine I pose the"figure what Continue number I'm thinking of" question, but I'm not asking only 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'm thinking of a 64-digit hexadecimal number. Now you see that it is going to be extremely difficult to guess the right answer.

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

In order to understand what these letters are doing in the center 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 chances, 0-9.

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