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Crypto
Blockchain
A digital ledger that records transactions across many computers so no single person can change the history.
A blockchain is made of 'blocks' of data chained together with cryptography. Each new block contains recent transactions plus a link to the previous one. This makes tampering almost impossible. Bitcoin uses it for money; Ethereum uses it for smart contracts and apps.
Think of it as a Google Doc that everyone can see but nobody can secretly edit.
Real world: When you send Bitcoin to a friend, that transfer gets added to the blockchain. Once confirmed, it's permanent. Even if one computer gets hacked, the other thousands still have the correct copy.
💡 Blockchain is the technology that makes crypto possible — a tamper-proof public record.