Crypto Basics #7 — Understanding Nodes

A node is a single computer taking part in a blockchain network. If the network is the crowd, a node is one person in it.

Each node does two jobs. It stores a full copy of the blockchain, and it checks new transactions against the network's rules before they're accepted. When a transaction breaks a rule, honest nodes simply reject it. No central referee is needed, because every node is checking independently and they have to agree.

This is what keeps a blockchain honest. A single node could be switched off, hacked, or run by someone dishonest, and the network would carry on without it. For a bad change to stick, it would have to fool a large majority of nodes at the same time. With thousands of them run by unrelated people, that's a steep barrier.

It also explains a common rule of thumb. The more nodes a network has, and the more independent they are, the harder it becomes for any single group to take control. Node count on its own isn't a perfect measure of health, but a network kept alive by many participants is in a stronger position than one leaning on just a few.

In short: A node is one computer in a blockchain network that stores the ledger and verifies activity, and many of them together keep the system trustworthy.

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