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

Bitcoin mining involves three variables: the block, the mining issue and a random number. Heres how it all comes together:

Imagine our block consists of the term BUTTERFLY discussed earlier. In reality, the cube could contain a listing of recent, unverified transactions, but lets keep it simple. In order for the block to be solved, bitcoin utilizes a simple test: If the HASH result of the block starts with a certain number of zeros, then the cube is considered verified.

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

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The problem: BUTTERFLY will return the exact same HASH, and it doesnt start with two zeros. Thus what we need is your next factor, a random number (called a NONCE). We carry this number, combine it with BUTTERFLY, and HASH again. If it doesnt start with two zeros, we change the number and try again, and since changing one small number changes the entire HASH outcome, there is no method to predict the number well need to address this! .

We repeat this process over and over until we find a number that, when combined with BUTTERFLY, provides us a HASH that starts 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 what creates bitcoin mining such a computationally expensive procedure, and as more miners join the network, the harder it gets. At 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. .

This has led to the rise of ASIC computers constructed particularly for mining and also to an increase in cloud mining.

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CPU mining. In the first days of bitcoin, mining difficulty was low and not a lot of miners were competing for cubes and rewards. This made it worthwhile to utilize your computers own central processing unit (CPU) to mine bitcoin. However, that approach was soon replaced by GPU mining.

GPU mining. A graphics processing unit (GPU) is a potent processor whose sole objective is to help your own computers graphics card in rendering 3D graphics. GPUs are not built for executive decisions (such as CPUs) however to be somewhat good labourers, hence GPUs are able to execute over 800 times more instructions in the same amount of time as a CPU.

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

ASIC mining. Similar to FPGAs, application-specific integrated circuits are processors designed for a specific purpose, 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 problem 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 payoff is shared with everyone in the swimming pool in a ratio representative of how much work you put into the pool (even though you personally never solved the mystery ). .

Cloud mining. her comment is here Clouds offer prospective miners the ability to buy mining channels in a remote data centre location. There are many obvious advantages, the most obvious beingno electricity costs, no excess heat and nothing to sell when you decide to hang up your virtual pickaxe.

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

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Desktop pockets. Software such as 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 platforms such as Coinbase or Circle and can be accessed from anywhere.

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

Paper wallets. Some websites offer paper wallet solutions, generating a bit of paper with two QR codes on it. One code is the public address at which you get bitcoin and the other one is the personal address you can use for spending.