Mining

Beyond simply adding blocks, mining serves two purposes at once: it creates new coins according to a fixed issuance schedule, and it secures the network by making it computationally expensive to rewrite history. Miners compete to find a numeric value, a nonce, that produces a block hash below a target set by the network's difficulty. Whoever finds it first broadcasts the block, and other nodes verify it before accepting it as the new tip of the chain.

This system, known as Proof of Work, ties a miner's influence directly to the computing power, or hash rate, they contribute. Difficulty adjusts periodically so that blocks keep arriving at a roughly constant pace even as total network hash rate rises or falls. Successful miners earn a block reward made up of newly minted coins plus the transaction fees included in that block, giving them a direct financial incentive to keep participating honestly.

On networks like Bitcoin, the block reward is cut in half at a fixed interval, an event called a halving, which gradually reduces new coin issuance toward a hard supply cap. Mining has evolved from ordinary CPUs and GPUs to purpose-built machines optimized for a single hashing algorithm, since specialized hardware finds far more attempts per second than general-purpose chips. As individual mining became less profitable, many participants joined pools that combine hash power and split rewards. Mining's heavy electricity use remains a widely debated topic, with the industry increasingly reporting a substantial share of power sourced from renewables, hydropower and nuclear among them.