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For instance, the SHA-256 of the term BUTTERFLY (source) is 8c62ace4f9ef8ccd08ca6fb992a8524bb7dbdc0530654bd254c9da07a660949a (HASH). This seemingly random string of letters and numbers contains three important properties:
Bitcoin mining involves three variables: the block, the mining difficulty and a random number. Heres how it all comes together:
Imagine our cube consists of the term BUTTERFLY discussed previously. In reality, the block would contain a list of recent, unverified transactions, but lets keep it simple. In order for the block to be solved, bitcoin utilizes a deceptively simple test: If the HASH result of the block begins with a certain number of zeros, then the cube is considered confirmed.
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For our example, lets say that we have a mining problem of just two, ie, our HASH should begin with two zeros. .
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The difficulty: BUTTERFLY will always return the same HASH, and it doesnt start with two zeros. So what we need is the next factor, a random number (called a NONCE). We take this number, combine it with BUTTERFLY, and HASH again. If it doesnt start with two zeros, we change the number and try again, and because changing one small number changes the whole HASH result, there's absolutely 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 begins with two zeros. That number is the solution to the block. Here are some attempts:
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 process, and as more miners join the network, the harder it gets. At November 2017, a normal home computer working alone, ie, not an application-specific integrated circuit (ASIC) and not a part of a cloud mining network, would require 2.7 million years to mine one block. .
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CPU mining. In the first days of bitcoin, mining difficulty was reduced and not a lot of miners were competing for cubes 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 original site GPU mining.
FPGA mining. Next came mining using 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 certain instructions and only those instructions (instead of being repurposed for mining, such as GPUs were).
ASIC mining. Comparable 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 internet cancel 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 just how much work you put into the swimming pool (even though you personally never solved the mystery ). .
Cloud mining. 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 expenses, no excess heat and nothing to sell when you opt to hang up your virtual pickaxe.
Once miners receive bitcoin, they are given a digital key to the bitcoin addresses. You can use this digital key to gain 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 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 shop and encrypt your own bitcoin keys so that you can make payments using your mobile device.
Paper wallets. Some websites offer paper wallet services, generating a piece of paper using just two QR codes on it. One code is your public address at which you get bitcoin and the other is the private address you can use for spending.