A blockchain is a public, append-only record of transactions. What makes it special isn’t just the data — it’s the structure. Each block contains a bundle of transactions and a cryptographic hash linking it to the one before it.
If you’ve explored the foundations in What Exactly Is Crypto?, this quiz shows you what happens under the hood: how data becomes tamper-resistant. For a deeper look at how wallets connect to this system, see How Crypto Wallets Work.
Every block depends on the previous block’s hash. Change anything — even a single character — and the hash breaks. That’s why blockchains are called immutable: the moment you alter something, the entire chain reveals that something is wrong.
But blocks alone don’t create security. Nodes — independent computers all running the same rules — verify the same data. When thousands of nodes store identical copies of the blockchain, the network becomes extremely difficult to falsify. If you’re curious how different networks structure these nodes, explore the Crypto Ecosystems Quiz.
The next piece is consensus. Whether it’s proof-of-work or proof-of-stake, consensus determines which block becomes official. Nodes must agree — not by trust, but by provable rules. For a look at how consensus affects fees and confirmations, visit How Crypto Transactions Work.
If you want to understand how blockchain interacts with market behavior, check out: How Crypto Gets Its Price Tag and Crypto Scarcity & Demand.
Blockchain doesn’t eliminate risk — it reduces the need for trust. That transparency is why headlines matter. To explore how narrative shapes sentiment, try the Crypto Headline Quiz.
The way blockchains scale also shapes user experience. To see how Layer 2s boost capacity while keeping security intact, explore Layer 2 Scaling.
Blockchain utility extends far beyond investment. If you want to see where real usage happens — payments, stablecoins, identity, apps — visit the Crypto Utility Quiz.
Strong blockchain understanding pairs well with strong personal security. Visit the guide on financial responsibility to sharpen your decision-making as you explore digital assets.
And since every secure system attracts attackers, understanding scams is essential. The breakdown of romance-crypto scams shows how emotional manipulation often succeeds where code cannot be broken.
Once you understand how the blockchain keeps itself honest, you understand why decentralized money became possible at all.