Mining
Mining is the process in which miners use computing power to create new blocks and secure a proof-of-work blockchain such as Bitcoin. It also issues new coins, as a reward to whoever finds the next valid block.
Mining step by step
First, a miner gathers valid transactions from the mempool, usually choosing those with the highest fees. Second, it builds a block header containing, among other things, the previous block's hash and a summary of the transactions. Third, it hashes that header over and over, changing a small field called the nonce each time, looking for a result below the network's target. Fourth, when it finds one, it broadcasts the block; nodes verify it and add it to their chain.
The successful miner receives the block reward, newly created coins, plus all fees in the block. Then everyone starts mining on top of the new block.
Why mining secures the network
Because valid blocks are expensive to produce, rewriting history would require redoing the work faster than the rest of the network combined. The cost of mining is therefore the price of attacking it. Every 2,016 blocks, roughly every two weeks, Bitcoin adjusts the difficulty so that blocks keep arriving about every ten minutes on average, whatever the total computing power.
Mining in practice
Bitcoin mining is now done with specialized machines called ASICs, mostly in large facilities near cheap electricity, and most miners join pools to smooth out income. The block reward halves about every four years; since April 2024 it has been 3.125 BTC. Not every cryptocurrency is mined: Ethereum ended mining in September 2022 when it moved to proof of stake.
Risks and misconceptions
Home mining with a laptop or phone does not earn meaningful bitcoin; apps that promise otherwise are often scams or hidden adware. Cloud mining schemes have a long record of fraud. For real mining operations, profits depend on coin prices, electricity costs, difficulty and hardware lifespans, all of which can turn against them. Energy use and local regulation are ongoing concerns.
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Frequently asked questions
Is crypto mining profitable?
It can be for operators with efficient hardware and cheap power, but margins shift with prices, difficulty and halvings. For most individuals, home mining costs more in electricity than it earns.
How long does it take to mine one bitcoin?
There is no fixed time per person. The whole network produces one block about every ten minutes; an individual's share depends on their part of the total computing power.
Is mining legal?
It is legal in many countries, but some have banned or restricted it, often over energy concerns. Rules and taxes vary by location.
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