What Is a Node?
A node is a computer running a blockchain's software: storing the ledger, verifying every transaction and block against the rules, and relaying valid ones onward. Thousands of independent nodes agreeing on the same history is the decentralization everyone keeps invoking; the nodes are where it physically lives.
How It Actually Works
- A full node downloads and independently verifies the entire chain. It takes nothing on faith: invalid blocks are rejected no matter who produced them, which is what actually disciplines miners and validators.
- Producing blocks is a separate job. Miners and validators propose; nodes judge. A network with millions of stakers but few independent nodes is centrally judged, whatever its marketing says.
- Your wallet talks to somebody's node. Default settings mean a company's node sees your queries and could, in principle, lie to you; running your own means your money answers only to rules you verified. Bitcoin's node runs on a modest home computer, which is by design.
Risks and Common Mistakes
- Believing "decentralized" claims without asking the node question: how many independent verifiers, run by whom, at what cost? Chains optimizing for speed often pay for it in node heaviness; the tradeoff is covered in Solana's entry.
- Confusing node counts with security theater: what matters is independent operators with the power to reject invalid history, exercised most famously when forks settle who follows which rules.
When It Matters
Sovereignty-minded holders run nodes to verify rather than trust; everyone else at least benefits from knowing who they are trusting instead. Node-in-a-box options for doing it yourself are linked in my Resource Library under running your own node.
Related Terms
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