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Blockchain & Cloud Computing · Module 5 of 10

Blockchain fundamentals

Understand distributed ledgers and how blocks link.

📖 Key ideas

  1. A blockchain is a shared, append-only ledger across many computers.
  2. Each block contains transactions, a timestamp and the previous block's hash.
  3. Changing old data breaks the hash chain, so tampering is detectable.
  4. Decentralisation removes a single controlling party.
  5. Uses: cryptocurrencies, supply chain, certificates, land records.
💡 Real-life example: A blockchain is a village ledger copied in every house: altering one copy is caught by everyone else.
BlockchainChain of linked blocks of records
HashFingerprint of data
NodeComputer keeping a copy of the ledger
DecentralisationNo single controller