Bitcoin Mining Explained: How New Bitcoin Gets Created
Bitcoin mining secures the network and creates new coins. Learn how it works, what miners earn, the energy debate, and whether home mining makes sense in 2026.
Every Bitcoin in existence was created through mining. No company mints it. No government issues it. New Bitcoin enters circulation as a reward to the people who secure the network by solving computational puzzles — a process called proof of work.
Understanding mining helps you understand why Bitcoin has value, why its supply is limited, and what the halving means for price.
What Is Bitcoin Mining?
Mining is the process of adding new transactions to the Bitcoin blockchain. Miners bundle unconfirmed transactions into a block, then compete to find a specific number (a nonce) that, when combined with the block data and hashed, produces an output meeting the network’s difficulty target.
Finding this nonce requires trillions of calculations per second. It is pure brute-force computation — there is no shortcut. The miner who finds it first broadcasts the block to the network, earns the block reward, and the process begins again for the next block.
A new block is found approximately every 10 minutes. This interval is maintained by automatic difficulty adjustments — if miners collectively become faster, the puzzle gets harder; if miners leave the network, it gets easier.
What Miners Earn
Miners earn two types of revenue: the block subsidy and transaction fees.
The block subsidy is newly created Bitcoin. When Bitcoin launched in 2009, each block rewarded 50 BTC. This reward halves every 210,000 blocks (approximately every 4 years). After the April 2024 halving, the current reward is 3.125 BTC per block — worth approximately £250,000 at current prices.
Transaction fees are paid by users who want their transactions included quickly. As the block subsidy declines towards zero (around 2140), transaction fees are intended to become the primary miner incentive.
The Hardware: ASICs
Early Bitcoin mining was possible on ordinary laptops. The network difficulty has increased so dramatically since 2009 that mining now requires Application-Specific Integrated Circuits — custom chips designed exclusively for Bitcoin’s SHA-256 hashing algorithm.
Leading ASIC manufacturers include Bitmain (Antminer series), MicroBT (Whatsminer), and Canaan (Avalon). Top-tier mining rigs in 2026 cost £2,000–£8,000 each and consume 3,000–5,000 watts of electricity.
Mining profitability depends on three variables: Bitcoin’s price, electricity cost, and network difficulty. With UK electricity costs averaging around 24p per kWh, home mining is unprofitable for most individuals. Large-scale operations in countries with cheap electricity (Iceland, Kazakhstan, Texas) dominate the industry.
Mining Pools
Because finding a block solo requires enormous hash rate, most miners join mining pools — groups that combine their computational power and share rewards proportionally. Solo miners might wait years between block rewards; pool miners receive small, frequent payments.
The largest pools in 2026 include Foundry USA, AntPool, F2Pool, and ViaBTC. Pool concentration is a genuine decentralisation concern — if a small number of pools control the majority of hash rate, they have significant power over transaction ordering.
The Energy Debate
Bitcoin mining consumes approximately 150 TWh of electricity annually — comparable to Poland’s total energy use. Critics argue this is wasteful. Supporters counter that an increasing share (estimated 50–60%) comes from renewable sources, and that securing a global monetary network justifies the cost.
The energy debate is ongoing and genuine. What is clear is that Bitcoin’s security is directly proportional to its energy consumption — this is a feature, not a bug, from a security perspective.
What This Means for UK Investors
Home mining is impractical for UK residents at current electricity prices. The economics simply do not work. But understanding mining helps you appreciate why the halving matters (supply shock every 4 years), why Bitcoin’s security is genuine, and why 21 million is a real hard cap.
This article is for educational purposes only and does not constitute financial advice. Always do your own research.
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