Miner
A miner is a participant that uses computing power to create new blocks on a proof-of-work blockchain such as Bitcoin. In return, a successful miner collects newly issued coins and the transaction fees in that block.
What a miner does
A miner picks waiting transactions from the mempool, assembles them into a candidate block and then searches for a hash that meets the network's difficulty target by trying enormous numbers of variations. The first miner to find one broadcasts the block, other nodes verify it, and the race starts again on top of it.
Miners decide which transactions to include, usually prioritizing those that pay higher fees. They cannot change the rules, steal coins or create extra rewards, because nodes would reject any invalid block.
Hardware and pools
Bitcoin mining today is done with ASICs, application-specific chips built only for its hashing algorithm, because ordinary computers and graphics cards are no longer competitive. Most miners join mining pools, which combine the hashing power of many participants and share rewards in proportion to work contributed. This turns a rare, lottery-like win into a steadier income stream.
The word miner can mean a company, an individual or the machine itself.
How miners earn and what it costs
Revenue comes from the block reward, the newly created coins, plus fees. The Bitcoin block reward halves roughly every four years, and the fourth halving in April 2024 cut it to 3.125 BTC, so fees are expected to matter more over time. Costs are mainly hardware and electricity.
Say a hypothetical miner earns 1,000 dollars a day in coins and spends 800 dollars on power. A falling coin price, a halving or rising network difficulty can wipe out that margin quickly.
Risks
Mining is a capital-intensive, cyclical business. Machines become outdated, energy prices change and regulation varies by country. Cloud mining contracts, where you pay someone else to mine for you, have been a common vehicle for fraud and deserve particular caution.
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Frequently asked questions
Can I mine Bitcoin at home?
Technically yes, but with a normal computer you would almost certainly earn less than your electricity costs. Profitable mining requires specialized hardware and cheap power.
Do Ethereum miners still exist?
No. Ethereum stopped using proof of work in September 2022 and now relies on validators who stake ETH instead of miners.
What happens when all bitcoin are mined?
Around the year 2140 issuance will reach zero, and miners will be paid only through transaction fees.
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