What Is Blockchain?
A blockchain is a shared digital ledger that records transactions in blocks linked together in chronological order, with each block containing a cryptographic fingerprint of the one before it. Because the ledger is copied across many computers and past blocks are hard to alter, it can record transfers without a central authority.
How Records Are Protected
Changing an earlier block would alter its fingerprint and break the chain, which the rest of the network would detect.
Uses
Blockchains underpin cryptocurrencies and are also used in some supply chain, payment, and record-keeping systems.
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Last updated: September 29, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.