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For example, the SHA-256 of this term BUTTERFLY (source) is 8c62ace4f9ef8ccd08ca6fb992a8524bb7dbdc0530654bd254c9da07a660949a (HASH). This seemingly random string of letters and numbers has three important properties:

Bitcoin mining involves three factors: the cube, the mining difficulty and a random number. Heres how it all comes together:

Imagine our block consists of the term BUTTERFLY discussed previously. In fact, the cube could contain a listing of recent, unverified transactions, but lets keep it simple. In order for the block to be solved, bitcoin uses a simple test: If the HASH consequence of the block starts with a certain number of zeros, the block is considered confirmed.

 

 

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For our example, lets say that we've a mining difficulty of just two, ie, our HASH must begin with two zeros. .

 

 

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The problem: BUTTERFLY will always return the exact same HASH, and it doesnt begin with two zeros. Thus what we need is the next factor, a random number (known as a NONCE). We take this number, combine it with BUTTERFLY, and HASH again. If it doesnt begin with two zeros, we change the number and try again, and since changing one little number changes the whole HASH result, there's absolutely no way to forecast the number well need to address this! .

We repeat this procedure over and over until we find a number that, when combined with BUTTERFLY, provides us a HASH that begins with two zeros. That number is the solution to the block. Here are some tries:

This arduous process of randomly trying to find a number that gives the solution is the thing that creates bitcoin mining such a computationally expensive procedure, and as more miners join the network, the tougher it gets. As of November 2017, a regular home computer working alone, ie, not an application-specific integrated circuit (ASIC) and not part of a cloud mining network, could require 2.7 million years into mine one block. .

 

 

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This has caused the growth of ASIC computers built particularly for mining and also to an increase in cloud mining.

 

 

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CPU mining. In the early days of bitcoin, mining issue was reduced and not a great deal of miners were competing for blocks and rewards. This made it rewarding to utilize your computers own central processing unit (CPU) to mine bitcoin. However, that strategy was soon replaced by GPU mining.

 

 

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GPU mining. An graphics processing unit (GPU) is a potent processor whose sole purpose is to assist your own computers graphics card in rendering 3D graphics. GPUs are not built for executive decisions (such as CPUs) but to be very great labourers, hence GPUs are able to execute over 800 times more instructions in the exact same amount of time as a CPU.

FPGA mining. Next came mining with field-programmable gate arrays (FPGAs). These significantly outperformed GPUs and CPUs in the mining process as FPGAs are chips that can be programmed to perform specific instructions and only those instructions (instead of being repurposed for mining, such as GPUs were).

ASIC mining. Similar to FPGAs, application-specific integrated circuits are chips designed for a particular function, in our situation mining bitcoin, and nothing else. ASICs for bitcoin were introduced in 2013 and, as of November 2017, they are the best processors available for mining bitcoin and they outperform FPGAs in electricity consumption. .

 

 

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Mining pools. To offset the difficulty of mining a block, miners started organising in cloud or pools mining networks. Whenever a miner in one of those pools solves a block, the reward is shared with everyone in the swimming pool in a ratio representative of just how much work you put into the pool (even though you personally never solved the mystery ). .

Cloud mining. Clouds provide potential miners the capability to buy mining rigs in a remote data centre location. There are many obvious advantages, the most obvious beingno energy costs, no extra heat and nothing to market when you decide to hang up your virtual pickaxe.

Once miners receive bitcoin, they next are given a digital key to the bitcoin addresses. You can use this digital key to access and validate or approve transactions.

 

 

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Desktop pockets. Software like Bitcoin Core allows you to send and store bitcoin addresses and also connects to the network to track transactions.

Online wallets. Bitcoin keys are saved online by exchange programs such as Coinbase or Circle and can be retrieved from anywhere.

Mobile wallets. Programs like Blockchain shop and encrypt your own bitcoin keys so you can make payments using your mobile device.

Paper wallets. Some websites offer paper wallet services, generating a piece of paper with two QR codes on it. One code is more helpful hints the public address at which you receive bitcoin and the other is your private address you can use for spending.

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