What is Bitcoin mining?
Quick Answer
Bitcoin mining is the process of validating transactions and adding them to the blockchain. Miners use specialized computers to solve cryptographic puzzles, competing to add the next block and earn newly minted Bitcoin as a reward.
TL;DR
Mining = computers competing to validate transactions. Winner gets newly created Bitcoin. Secures the whole network.
Key Takeaways
- 1Mining validates transactions and secures the Bitcoin network
- 2Miners earn 3.125 BTC per block as of April 2024 (~$335,000 at current prices)
- 3Mining uses the SHA-256 proof-of-work algorithm
- 4Difficulty auto-adjusts every 2016 blocks to maintain ~10 minute block times
- 5Home mining is generally not profitable — industrial operations dominate
Full Explanation
Bitcoin mining is the process by which new transactions are verified and permanently added to the Bitcoin blockchain. It is both the mechanism that creates new Bitcoin and the security backbone of the entire network.
The process: every 10 minutes, all unconfirmed transactions waiting in the mempool are bundled into a candidate block. Miners take this block and attempt to find a special number (nonce) that, combined with block data, produces a cryptographic hash below a target value. Finding it requires trillions of computations per second — pure brute force.
The first miner to find a valid hash broadcasts the completed block to the network. Other nodes verify it independently. The winning miner receives the block reward (3.125 BTC since April 2024) plus all transaction fees in the block. This is the only way new Bitcoin enters circulation — through mining work.
Difficulty automatically adjusts every 2016 blocks (~2 weeks) to keep block times at approximately 10 minutes regardless of total network hashrate. As more miners join, difficulty rises. If miners leave, difficulty drops.