Question
Which of the following statements regarding features of blockchain technology are correct?
1. Records may be made visible to stakeholders without risk of alteration.
2. Entire database copies are stored on multiple network computers, syncing within seconds.
3. Consortium blockchain blends public and private blockchains for selective access.
4. Data once recorded and accepted cannot be changed or deleted.
Explanation
Statement 1 — Correct: Blockchain allows records to be shared transparently with relevant stakeholders while protecting them from unauthorized alteration. Its append-only structure and consensus mechanism help maintain data integrity.
Statement 2 — Correct: Blockchain works through a distributed ledger, where copies of the database are maintained across multiple network nodes and synchronized through the underlying consensus mechanism.
Statement 3 — Incorrect: A consortium blockchain is a permissioned blockchain jointly governed by a group of organizations. Calling it a direct “blend of public and private blockchains” is technically inaccurate.
Statement 4 — Correct: Cryptographic algorithms and hashing make unauthorized modification extremely difficult. Once validated and added, altering the data would require manipulation of subsequent blocks and overcoming the network’s consensus mechanism, making it practically immutable.
Therefore, Statements 1, 2 and 4 are correct, making Option C the appropriate answer.
Note: Statement 3 can also be considered correct under a broader description of consortium blockchains, but Option C is the appropriate answer among the given choices.