Emerging Trends · Class 11 · CBSE · Science Computer Science
In a blockchain system, why is altering a previously recorded block generally difficult?
Practice question from Emerging Trends (Class 11 · CBSE · Science Computer Science), with the correct answer and a step-by-step solution.
hard · MCQ · Q-AEE706
In a blockchain system, why is altering a previously recorded block generally difficult?
- A.Blocks are stored only on one central computer.
- B.Each block is linked to the previous block using cryptographic information, and copies are maintained across participating computers.Correct answer
- C.Blockchain data is automatically deleted after a fixed period.
- D.Only images and videos can be stored in a blockchain.
Solution
A blockchain links each block to the preceding block through cryptographic hashes. Because the ledger is replicated across many participating computers, changing an old block would require altering subsequent links and gaining agreement from the network.
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