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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 who took the problem of looking at either of the bills' consecutive numbers would see that they were exactly the same number, and thus 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) worth of Bitcoin transactions, they are entitled to win the 12.5 BTC. The 1 MB limit was established 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 stated 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 theoretically be as little as 1 transaction (although this is not in any way common) or a few 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 effort, one is a matter of luck.

2) You have to be the first miner to arrive at the perfect answer to some numeric issue. This practice 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 actually 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 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 high"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 how much Bitcoin you could mine along with your mining rig's hash rate, the website Cryptocompare provides a very 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--particularly Ethereum miners--purchase individual graphics cards (GPUs) check my blog as a cheap way to cobble together mining operations.  The photograph below is a makeshift, high-tech 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.

Example: I tell three friends I'm thinking of a number between 1 and 100, read what he said and I write that number on a piece of paper and seal it in an envelope. My friends don't need to guess the specific number, they simply have to be the first person to guess any number that is less than or equal to the number I'm thinking of.

How Bitcoins Are Made - Questions

Let's say I am thinking of the number 19. If Friend A guesses 21they shed because 21>19. If Friend B guesses 16 and Friend C supposes 12, then they've both theoretically arrived at workable answers, since 16<19 and 12<19. There is no"extra credit" for Friend B, even though B's answer was closer 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 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. Typically, it is the miner that has done the work, i.e.

The losing block then becomes an"orphan block" .

Now imagine I pose the"guess what number I am thinking of" question, but I'm not asking only three friends, and I am not thinking of a number between 1 and 100. Instead, I am asking millions of would-be miners and I'm thinking of a 64-digit hexadecimal number. Now you see that it's going to be extremely difficult to guess the right answer.

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

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

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