Blockchain Basics: How It Actually Works

A blockchain is a shared ledger maintained by many independent computers instead of one central server. Every new batch of transactions (a "block") references the block before it using a cryptographic hash, forming a chain — hence the name. Changing a past transaction would change its hash, which would break every block after it, so altering history requires redoing an enormous amount of work that the rest of the network can immediately detect and reject.

This is what people mean by "trustless": you don't have to trust a single company to keep an honest ledger, because thousands of independent copies of the same ledger are compared constantly, and the network only accepts the version most participants agree on.

A few terms worth knowing:

- Node: a computer running the blockchain's software and holding a copy of the ledger.
- Consensus: the rule the network uses to agree on which new block is valid (proof-of-work, proof-of-stake, and others).
- Wallet: software that holds your private keys, which prove ownership of assets recorded on the chain — the ledger itself never stores your identity, only addresses and balances.

Understanding this foundation makes everything else — wallets, exchanges, fees, confirmations — much easier to reason about, because you can trace each of those concepts back to "how do independent computers agree on one shared history."

Blockchain Basics: How It Actually Works

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