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What is a blockchain?
A blockchain is a shared record that many independent parties can trust without trusting each other.
The core idea
Transactions are grouped into blocks. Each block carries a cryptographic fingerprint of the one before it, forming a chain. Change anything in an old block and every later fingerprint breaks, which makes tampering obvious.
Because many independent participants hold a copy and agree on which chain is valid, no single operator can quietly alter the record.
The parts that matter
Blocks
Batches of transactions, timestamped and cryptographically linked to their predecessor.
Consensus
The rules participants follow to agree which version of the record is the real one.
Nodes
Independent computers that store the record and validate new transactions against the rules.
Smart contracts
On some networks, code that executes automatically when defined conditions are met.
Where it genuinely helps
Blockchains are useful where several parties need a shared record, do not fully trust one another, and want transparency about changes: settlement between institutions, provenance tracking, and issuing assets that can move without a central registry.
Where it is oversold
A blockchain is slower and more expensive than an ordinary database. If one trusted organisation already controls the data, a database is usually the better engineering answer. Treat any project that cannot explain why it needs decentralisation with scepticism.
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