Oct 1, 2026 · 5:40
What Is a Blockchain? Explained Simply
What is a blockchain? Think of a digital notebook shared across computers, with a history designed to be difficult to secretly rewrite. Robo borrows a drill from his neighbourhood tool library – and the lending notebook turns into a blockchain, step by step: shared copies, linked blocks with digital fingerprints, signatures, and rules for agreeing which history to follow.
Also: what a blockchain cannot do. A properly signed entry can still be wrong about the real world, not every blockchain is public or anonymous, and for many jobs an ordinary database is simpler.
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Sources & further reading (7)
- NIST – Blockchain
https://www.nist.gov/information-technology/blockchain - NIST (2019) – Blockchain Provides Security, Traceability for Smart Manufacturing
https://www.nist.gov/news-events/news/2019/02/nist-blockchain-provides-security-traceability-smart-manufacturing - NIST IR 8202 (2018) – Blockchain Technology Overview
https://nvlpubs.nist.gov/nistpubs/ir/2018/NIST.IR.8202.pdf - Bitcoin – How does Bitcoin work?
https://bitcoin.org/en/how-it-works - Bitcoin Core – Validation
https://bitcoin.org/en/bitcoin-core/features/validation - Satoshi Nakamoto (2008) – Bitcoin: A Peer-to-Peer Electronic Cash System
https://bitcoin.org/bitcoin.pdf - Ethereum – Proof-of-stake
https://ethereum.org/developers/docs/consensus-mechanisms/pos/