Crypto Basics #6 — Understanding Blockchain Networks

We've covered what a blockchain is as a record. The blockchain network is the living system that keeps that record running.

Instead of one server in one data center, a blockchain network is made up of thousands of independent computers spread across the world. Each one holds a copy of the blockchain and helps check new activity against the network's rules. They're run by different people, in different countries, with no central operator coordinating them.

This structure is the source of a blockchain's main strength. Because no single party holds the system, no single party can shut it down, censor it, or rewrite it. To force a dishonest change, an attacker would need to control a large share of the entire network at once, which becomes harder and more expensive the more participants there are.

That's why decentralization isn't just a buzzword in crypto. A network spread across many independent, active participants is genuinely harder to attack or pressure than one with only a handful. When people compare blockchains, how decentralized and active the network is tells you a lot about how secure it really is.

In short: A blockchain network is the worldwide set of independent computers that runs a blockchain, and its spread is what makes it hard to control.

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