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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 attempt to spend both the real bill and the imitation one, someone that took the trouble of looking at either of the invoices' serial numbers would observe that they had been the same number, and consequently one of them needed to be fictitious.

This isn't a perfect analogy--we will 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 set 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 qualified to earn Bitcoin--not everyone who supports transactions will receive paid off.

1MB of transactions can technically be little as 1 transaction (though this is not at all 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 effort, one is a matter of luck.

2) You must be the first miner to reach the perfect answer to some numeric issue. This practice is also known as an evidence of work.

The fantastic news: No advanced math or computation is involved. You might have heard that miners are solving difficult mathematical problems--that's 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: Because it's guesswork, you need a good deal of computing power in order to get there . To mine successfully, you need to get a higher"hash speed," that 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 how much Bitcoin you can mine along with your mining rig's hash rate, the site Cryptocompare provides 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 method to cobble together mining operations.  The photograph below is a makeshift, home-made mining machine.  The 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 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 need to guess the exact number, they simply have to be the first person to figure any number that's less than or equal to the number I'm thinking of.

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Let us say I am thinking of 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 theoretically arrived 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 goal answer of 19. .

In Bitcoin conditions, simultaneous answers occur frequently, but in 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 determine by a simple majority--51 percent --that miner to honour. Normally, it is the miner that has done the most work, i.e.

The losing navigate to this site block then becomes an"orphan block." .

Now imagine that I present the"figure what number I'm thinking of" question, but I am not asking only three friends, and I'm not thinking of a number between 1 and 100. Rather, I'm asking millions of prospective miners and I am 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 above has 64 digits. Easy enough to understand up to now. As you likely noticed, that number consists not only of numbers, but also letters of this alphabet. Why is that

In order to understand these letters are doing in the center of numbers, let's unpack the word"hexadecimal."

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