CompTIA Security+ (SY0-701) · Free practice question 3 of 12
Blockchain open public ledger integrity
A consortium of shipping firms records cargo hand-offs on a distributed ledger. Each block holds a hash of the previous block, and many participants keep copies. What security benefit does this design mainly provide?
- A.Data can be deleted on request without leaving any trace
- B.Users no longer need to authenticate to submit entries
- C.Changes to past records are easy to detect because altering one block breaks the chain of hashes
- D.The records are automatically kept confidential from all participants
Show answer and explanation
Correct answer: C. Changes to past records are easy to detect because altering one block breaks the chain of hashes
Why: Because each block includes the hash of the one before and the ledger is copied across many participants, tampering with an old record changes its hash and breaks the chain, making the change evident. A public ledger is designed for transparency, so it does not keep records confidential by default. Authentication is still needed, and the append-only design makes silent deletion difficult rather than easy.
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