Blockchain
A shared ledger whose blocks are linked by cryptographic hashes.
In more detail
Think of a history that many participants can check for themselves. Each block points back to earlier data, so quietly changing an old entry also breaks later links. The network's consensus rules make replacing accepted history costly or difficult; the hashes alone aren't the whole security story.
How you might use it
You look up a BTC payment and can follow its block back through the chain, rather than relying only on an exchange's receipt.
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