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Blockchain
Blockchain is a public, decentralized ledger of transactions that's shared across a network of computers. It's a database that stores data in blocks that are linked together in a chain.

How does blockchain work?
  • Cryptography: Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. 
  • Consensus: The network must agree to any changes to the chain. 
  • Security: Digital signatures prevent other users from corrupting or changing data without permission.