# What Does Bitcoin Trading History Do?

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Let us say you had one legit $20 and one quite good photocopy of that same $20. If someone were to try to spend both the real bill and the imitation one, someone that took the trouble of looking at both of the invoices' serial numbers would see that they were the same number, and thus one of them had to be fictitious.

That 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 entitled to win the 12.5 BTC. The 1 MB limit was established by Satoshi Nakamoto, and is a matter of controversy, as some miners believe the block size should be increased to accommodate more data.

Note that I said 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 theoretically be as 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 fulfill two conditions. One is a matter of work, one is a matter of luck.

2) You have to be the first miner to arrive at the perfect answer to some numeric problem. This process is also known as a proof 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 at all. What they're doing is trying to be the first miner to think of a 64-digit hexadecimal number (a"hash") which is less than or equivalent to the target hash.

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The bad news: Since it is guesswork, you need a lot of computing power in order to get there first. To mine successfully, you need to get a higher"hash speed," which 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 how much Bitcoin you could 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 into the tens of thousands. Some miners--particularly Ethereum miners--buy individual graphics cards (GPUs) as a cheap method to cobble together mining operations. The photo below is a makeshift, high-tech mining machine. The cards are those rectangular cubes with whirring circles. Note the sandwich twist-ties holding the pictures cards to the metal pole.

Example: I tell three friends I'm thinking of 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 specific number, they just have to be the very first person to guess any number that's less than or equal to the number I am thinking of.

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Let us say I am thinking of the number 19. If Friend A guesses 21they shed because 21>19. If Friend B supposes 16 and Friend C guesses 12, then they've both technically came 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 terms, simultaneous answers happen 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 decide by a simple majority--51 percent --which miner to honour. Typically, it's the miner who has done the work, i.e.

The losing block then becomes an"orphan block" .

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

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The number preceding 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's unpack the term"hexadecimal."

As you know, we utilize the"decimal" system, which means it's base 10. This in turn means that every digit has more information 10 chances, 0-9.