What is a node in a blockchain?

It’s the computer that keeps the network alive. A node downloads, verifies, and stores the transaction history, and relays new information to the rest of the participants.

There are several types:
• Full node: stores the entire blockchain and validates every rule.
• Light node: only the headers, ideal for mobile devices.
• Miner/validator node: proposes new blocks.
• Archive node: stores the entire state history.

When you use an exchange or an external wallet, you rely on someone else’s node. If you run your own, no one can censor you or feed you false information. That’s sovereignty.

Bitcoin has more than 15,000 public nodes. Each additional one adds resilience. And no, you don’t need a data center: a Raspberry Pi and 600 GB are enough.

Understanding this helps you read protocol updates and anticipate volatility when there are forks.

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