Crypto Basics #1 — Understanding Blockchain

Every cryptocurrency you've heard of runs on the same underlying invention: the blockchain. Before you look at any individual coin, this is the concept worth understanding first, because everything else builds on top of it.

A blockchain is a shared digital ledger: a record of transactions that thousands of computers around the world hold a copy of at the same time. When someone makes a transaction, the network checks it against every existing copy and only adds it once there's agreement. There's no central bank or company deciding what's valid. The network does that collectively.

The name describes how the data is stored. Transactions are grouped into blocks, and each new block is cryptographically linked to the one before it. That chain of blocks is what makes the record so hard to tamper with. Changing an old entry would mean rewriting every block after it, on every copy, at the same time.

If you come from traditional finance, think of it as an accounting book that no single party owns and no single party can quietly edit. That property, a record everyone can trust without trusting each other, is the whole point.

In short: A blockchain is a shared, tamper-resistant record maintained by a global network rather than a single authority.

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