Technology
How Does Bitcoin Work? Blocks, Miners and Keys Explained
A plain-English walkthrough of transactions, the blockchain, mining and private keys, and how they let strangers agree on who owns what.
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Technology
How Bitcoin works under the hood: blocks, miners, nodes and keys, the energy debate around mining, and the Lightning Network for faster payments.
Bitcoin technology is the set of rules and machines that let strangers agree on who owns what without a bank keeping the ledger. This section explains how Bitcoin works, from transactions and the blockchain to mining and the Lightning Network, in plain English. The best starting point is How Does Bitcoin Work? Blocks, Miners and Keys Explained, which follows a payment from signature to confirmation.
Two deeper articles build on it. Inside a Bitcoin Mining Operation covers proof of work, specialized ASIC chips, mining pools, the halving about every four years and the energy debate, with the arguments on both sides. What Is the Lightning Network? describes a second layer for small, fast payments and the trade-offs that come with it, such as liquidity limits and custody choices.
Each article separates what is fixed in the protocol, like the 21 million cap and a block about every ten minutes, from what changes quickly, like fees and wallet software. We avoid quoting hash rate or fee figures because they go stale. If you want the roles of nodes and miners first, the how-it-works guide covers them. New to the subject? The Start Here path gives an order to read in, and Security covers protecting the keys this technology relies on.
Articles in Technology
Technology
Inside a Bitcoin Mining Operation
What Bitcoin miners actually do, how proof of work and ASICs function, why mining uses so much energy, and how halvings change the economics.
Technology
What Is the Lightning Network?
The Lightning Network is a second layer on top of Bitcoin built for fast, small payments. Here is how payment channels work and where the trade-offs are.
Frequently asked questions about Technology
How does Bitcoin work?
Bitcoin works as a shared public ledger that thousands of computers keep identical copies of. Users sign transactions with private keys, miners bundle them into a block about every 10 minutes, and nodes check every block against the rules. Each block links to the one before it, which makes rewriting history extremely costly. How Does Bitcoin Work? walks through each step.
What is Bitcoin mining?
Bitcoin mining is the competition to add the next block of transactions to the chain. Miners repeatedly guess a number until a hash meets a difficulty target, which is called proof of work. The winner earns newly issued bitcoin plus transaction fees. The work is costly to do and easy for everyone else to verify. See Inside a Bitcoin Mining Operation.
Why does Bitcoin mining use so much energy?
Mining uses a lot of electricity because proof of work is deliberately expensive: the security comes from the real cost of attacking the network. Critics point to emissions and local power prices, while defenders note that miners seek cheap, sometimes otherwise unused power. Estimates of the renewable share differ, so check the source and date. More in Inside a Bitcoin Mining Operation.
What is the Bitcoin halving?
The halving is a scheduled cut in the block subsidy, the new bitcoin paid to miners, that happens every 210,000 blocks, roughly every four years. The subsidy fell from 50 bitcoin in 2009 to 3.125 after April 2024, and total supply approaches 21 million around 2140. Learn more in Inside a Bitcoin Mining Operation.
Who runs the Bitcoin network?
No single party runs Bitcoin. Nodes are computers that store the ledger and check every block against the rules, and miners compete to add blocks. A miner cannot create extra coins or spend other people's coins, because nodes reject blocks that break the rules, and anyone can run a node. See How Does Bitcoin Work? for how the roles fit together.
What is the Lightning Network and how is it different from Bitcoin?
The Lightning Network is a payment layer built on top of Bitcoin, not a separate coin. Two people lock bitcoin into a shared channel and update balances off-chain, so only the opening and closing reach the blockchain. It suits small, fast payments but has liquidity limits and custody trade-offs. See What Is the Lightning Network?.
Keep exploring
- Security
How to buy bitcoin carefully, hold your own keys, back up a seed phrase and understand what your transactions reveal, plus the scams to avoid.
- Money & Economics
Why Bitcoin has value, how its fixed supply relates to inflation, what bitcoin savings accounts really are and what monetary freedom costs.
- Privacy
What Bitcoin transactions reveal, what they do not, and the wider case for financial privacy and its trade-offs.