Bitcoin mining is the competitive process used to add new blocks to the blockchain. It helps order transactions, distribute newly issued bitcoin according to the supply rules, and make transaction history costly to change.
Mining is important, but miners do not control Bitcoin by themselves. Nodes independently verify every proposed block.
Miners assemble candidate blocks
Miners receive valid unconfirmed transactions from the peer-to-peer network. They choose transactions for a candidate block, usually considering fee rates and their own policies.
The block also contains a special coinbase transaction that can pay the miner the permitted block subsidy and the fees from included transactions. If that payment claims more than the rules allow, nodes reject the block.
Proof of work is a repeated guessing process
Mining equipment repeatedly hashes block-header data while changing available values. The goal is to produce a hash below the current network target.
There is no shortcut that guarantees the next valid result. More hash rate provides more attempts over time, but any individual attempt may fail. Once a miner finds a valid result, other nodes can verify the proof quickly.
Nodes decide whether a block is valid
A miner broadcasts a completed block to the network. Full nodes check its proof of work, transaction validity, block structure, and compliance with the supply and consensus rules.
Valid blocks can extend the blockchain. Invalid blocks are rejected. This separation matters: miners propose blocks, while nodes enforce the rules they accept.
Mining difficulty keeps the schedule steady
The total amount of mining power can rise or fall. Bitcoin periodically adjusts the proof-of-work difficulty so blocks continue to be found near the intended average interval.
If total hash rate increases, the difficulty can rise. If hash rate falls, the difficulty can decrease. Individual block times still vary because mining is probabilistic.
How miners are paid
A successful block can provide two sources of revenue: the block subsidy and transaction fees. The subsidy follows Bitcoin's issuance schedule and is reduced during halving events. Fees are supplied by users whose transactions appear in the block.
Solo miners keep the reward from blocks they find but can experience long, unpredictable gaps between successful blocks. Mining pools combine work from many participants and distribute payouts according to the pool's rules, creating smaller but more frequent payments.
What mining does and does not do
Mining helps secure transaction ordering and makes rewriting confirmed history expensive. It does not store bitcoin inside mining machines, approve invalid money creation, or allow miners to spend coins without the required signatures.
Mining also uses specialized hardware and significant energy. Evaluating its economics or environmental impact requires current information about equipment, energy sources, local conditions, and network competition. Avoid conclusions based on a single global average.
Continue learning
Review proof of work, hash rate, difficulty, block reward, and halving in the BTCFQ glossary. The BTCFQ FAQ page also answers common questions about mining and Bitcoin's supply.
