# Our How Bitcoins Are Made Diaries

Let's say you had one legit $20 and one quite good photocopy of the 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' serial numbers would see that they were exactly the same number, and thus one of them had to be fictitious.

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

Once a miner has confirmed 1 MB (megabyte) worthiness of Bitcoin transactions, they are entitled 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 stated that verifying 1 MB worth of transactions makes a miner eligible to earn Bitcoin--not everyone who verifies transactions will get paid off.

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

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

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

The good news: No advanced math or computation is involved. You might have discovered that miners are solving difficult mathematical problems--that is not true at all. What they're doing is trying to be the first miner to come up with a 64-digit hexadecimal number (a"hash") which is less than or equal 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 have 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 could mine with your mining rig's hash rate, the website Cryptocompare offers 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 photograph below is a makeshift, high-tech mining machine. The cards are those rectangular blocks with whirring circles. Note the sandwich twist-ties holding the graphics cards into the metal rod.

Case in point visit : I 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 have to guess the exact number, they simply must be the very first person to figure any number that is less than or equal to the number I'm thinking of.

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Let us say I'm thinking of the number 19. If Friend A guesses 21they lose because 21>19. If Friend B guesses 16 and Friend C guesses 12, then they have both technically came 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 target 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 which can be equal to or less than the target number, the Bitcoin network will decide by a simple majority--51%--that miner to honour. Normally, it's the miner that has done the most work, i.e.

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

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

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The number above has 64 digits. Easy enough to understand up to now. 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 center of numbers, let us unpack the word"hexadecimal."

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