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Mining | Bitcoin Glossary | Mapping Bitcoin

Mining

Mining

Also known as: Bitcoin mining

The process of using computational power to find a valid nonce that produces a block header hash below the current difficulty target. Mining secures the network, processes transactions, and introduces new bitcoin into circulation through block rewards.

Overview

Bitcoin mining is the computational process by which new blocks are added to the blockchain. Miners repeatedly hash a candidate block header — varying the nonce and other fields — until they find a hash value that falls below the current difficulty target. This proof-of-work process secures the network, orders transactions, and controls the issuance of new bitcoin.

The Mining Process

┌────────────────────────────────────────┐
│         Candidate Block Header         │
│  ┌──────────┬──────────┬────────────┐  │
│  │ Version  │Prev Hash │Merkle Root │  │
│  ├──────────┼──────────┼────────────┤  │
│  │Timestamp │  Bits    │   Nonce    │  │← Vary this
│  └──────────┴──────────┴────────────┘  │
│                   │                    │
│              SHA-256(SHA-256())         │
│                   │                    │
│                   ▼                    │
│  Hash < Target?  YES → Valid block!    │
│                  NO  → Change nonce    │
└────────────────────────────────────────┘

Block Rewards

The miner who successfully finds a valid block earns two types of reward:

  1. Block subsidy: Newly created bitcoin, currently 3.125 BTC per block (after the April 2024 halving). This amount halves approximately every four years.
  2. Transaction fees: The sum of all fees from transactions included in the block.

Together, these rewards incentivize miners to invest in hardware and electricity to secure the network.

Energy and Security

Mining deliberately requires energy expenditure, which serves as the physical anchor for Bitcoin's security. The cumulative energy spent on mining creates a cost to rewriting the blockchain's history, making confirmed transactions increasingly irreversible with each subsequent block.

Common Misconceptions

Mining does not involve "solving complex math problems" in the academic sense. It is a brute-force search for a hash output below a threshold — essentially a high-speed guessing game. There is no shortcut or clever algorithm; the only way to mine faster is to hash faster.

Related Terms

Proof of WorkMining

A consensus mechanism where miners expend computational energy to find a hash below a target difficulty, proving that real-world resources were consumed to create a block. Proof of work secures the Bitcoin network by making it prohibitively expensive to rewrite blockchain history.

MinerMining

A participant in the Bitcoin network who uses computational power to find valid proof-of-work solutions and add new blocks to the blockchain. Miners are rewarded with newly created bitcoin (block subsidy) and transaction fees for their work.

Block RewardMining

The amount of newly minted bitcoin awarded to the miner who successfully mines a block. The reward started at 50 BTC and halves approximately every 210,000 blocks (about four years), creating Bitcoin's controlled supply schedule.

NonceMining

A 32-bit number in the block header that miners increment to produce different hash outputs when searching for a valid proof of work. Miners vary the nonce (and other fields) until the resulting block header hash falls below the difficulty target.