# The 25-Second Trick For Bitcoin Trading History

Let's say you had one legit \$20 and one really good photocopy of the same \$20. If someone were to try to spend both the true bill and the fake one, someone who took the trouble of looking at either of the invoices' consecutive numbers would observe that they were exactly the same number, and thus one of them had to be false.

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

Once a miner has confirmed 1 MB (megabyte) worth of Bitcoin transactions, they are eligible 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 ought to 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 verifies transactions will get paid out.

1MB of transactions can theoretically be as little as 1 transaction (though this is not in any way common) or a few 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 right answer to a numeric problem. This practice is also known as a proof of work.

The fantastic news: No advanced math or computation is involved. You might have discovered that miners are solving challenging mathematical problems--that's not true in any way. What they are 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.

The bad news: Since it is guesswork, you need a good deal of computing power in order to get there first. To mine successfully, you need to have 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 with your mining rig's hash rate, the site Cryptocompare provides a 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--particularly Ethereum miners--buy individual graphics cards (GPUs) as a cheap way to cobble together mining operations.  The photo below is a makeshift, home-made mining machine.  The cards are such rectangular blocks with whirring circles.  Note the sandwich twist-ties holding the graphics cards into the metal rod.

Case in point I tell three friends I'm thinking of 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 need to guess the specific number, they just have to be the very first person to figure any number that is less than or equal to this number I am thinking of.

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Let's 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 have browse around this site 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 closer to the goal answer of 19. .

In Bitcoin terms, simultaneous answers happen frequently, but at 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 percent --that miner to honour. Normally, 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 am not asking just 3 friends, and I'm not thinking of a number between 1 and 100. Rather, I am asking millions of would-be miners and I am thinking of a 64-digit hexadecimal number. Now you see that it's going to be extremely difficult to guess the right answer.