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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 cube, the mining issue and a random number. Heres how it all comes together:

Imagine our cube consists of the word BUTTERFLY discussed earlier. In fact, the block could contain a list 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 begins with a certain number of zeros, the block is considered verified.

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

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The difficulty: BUTTERFLY will always return the exact same HASH, and it doesnt begin with two zeros. So what we need is the third factor, a random number (called a NONCE). We carry this number, combine it with BUTTERFLY, and HASH again. If it doesnt begin with two zeros, we change the number and try again, and because changing one small number changes the entire HASH result, there's absolutely no method to predict the number well need to solve this! .

We repeat this procedure over and over until we find a number that, when combined with BUTTERFLY, gives us a HASH that starts with two zeros. That number is your 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 makes bitcoin mining such a computationally expensive process, and as more miners join the network, the tougher it gets. At November 2017, a normal home computer working alone, ie, not an application-specific integrated circuit (ASIC) and not part of a cloud mining network, would require 2.7 million years to mine one block. .

This has led to the rise of ASIC computers built specifically for mining and to an increase in cloud mining.

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CPU mining. In the early days of bitcoin, mining issue was low 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.

GPU mining. A graphics processing unit (GPU) is a powerful processor whose sole purpose is to help your own computers graphics card in rendering 3D graphics. GPUs are not constructed for executive decisions (like CPUs) however to be very great labourers, hence GPUs are able to execute over 800 times more instructions in precisely the 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 execute 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 case mining bitcoin, and nothing else. ASICs for bitcoin were introduced in 2013 and, as of November 2017, they are the best processors out there for mining bitcoin and they outperform FPGAs in electricity consumption. .

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Mining pools. To cancel the difficulty of mining a block, miners started organising in pools or cloud 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 swimming pool (even though you personally never solved the puzzle). .

Cloud mining. Clouds offer potential miners the capability to purchase mining rigs in a remote data centre location. There are many obvious advantages, the site link most obvious being: no electricity expenses, no extra heat and nothing to market when you opt to hang your virtual pickaxe.

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

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Desktop pockets. Software like Bitcoin Core lets you send and save bitcoin addresses and also connects to the network to monitor transactions.

Online wallets. Bitcoin keys are saved online by exchange platforms like Coinbase or Circle and can be retrieved from anywhere.

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

Paper wallets. Some websites provide paper wallet services, generating a bit of paper with just two QR codes on it. One code is the public address where you receive bitcoin and the other one is the private address you can use for spending.