What Is Bitcoin Mining? How New BTC Enters Circulation
Mining in one sentence
Bitcoin mining is specialized computing that proposes the next block of transactions and, if accepted by the network, earns a reward.
Why mining exists
Bitcoin has no central bank. Instead, miners:
- Collect pending transactions into a candidate block
- Race to find a valid proof-of-work solution
- Broadcast the winning block to the peer-to-peer network
- Receive the block subsidy plus transaction fees
That race is what keeps the ledger append-only and hard to rewrite.
Proof-of-work and SHA-256
Bitcoin’s mining algorithm is built on SHA-256. Miners repeatedly hash block headers until the result is below a network target (the difficulty).
- More hashrate → more guesses per second
- Higher difficulty → harder target
- Difficulty adjusts about every two weeks so blocks stay near ~10 minutes apart
What “winning a block” means
Only one miner (or pool share path) wins each block. Everyone else spent electricity on attempts that did not pay that round. Over time, expected rewards scale with your share of global hashrate — minus luck variance.
Takeaway
Mining is not “printing money from thin air.” It is paid work that secures Bitcoin’s history and issues new coins on a transparent schedule.