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Blockchain differs from a traditional banking database mainly because it is:
AStored on a single central server owned by a bank
BEditable by any single member of the network
CLimited to storing only numeric transaction data
DA decentralised database held by every node
Answer & Solution
Correct answer: D. A decentralised database held by every node
1. Traditionally digital transactions are stored in a centralised database and updated one by one.
2. Because all the data sits in one place, it can be hacked or lost.
3. Blockchain instead works on a decentralised and shared database where each computer has a copy.
4. Every participating node receives a full copy of an append-only ledger.
5. A block is added only after all nodes authenticate the transaction, so no single member can alter the data.
_Source: NCERT Informatics Practices Class 11, Ch 2 'Emerging Trends', S2.7 Blockchains_
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