Which of the following statements regarding the features of blockchain technology are correct? 1. Records stored in the database may be made visible to relevant stakeholders without risk of alteration. 2. Copies of the entire database are stored on multiple computers on a network, syncing within seconds. 3. Consortium blockchain is a blend of public and private blockchains allowing selective data access. 4. Mathematical algorithms make it impossible to change or delete any data once recorded and accepted. Select the answer using the code given below:
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A hard Science & Technology multiple-choice question from UPSC Prelims 2026. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: C. 1, 2 and 4
Statements 1, 2 and 4 correctly describe blockchain — tamper-evident shared records, a distributed ledger replicated across nodes that syncs quickly, and cryptographic immutability of accepted data. Statement 3 is the outlier as marked by the key: a consortium (federated) blockchain is a permissioned chain governed by a group of organisations rather than a "blend of public and private" chains. So 1, 2 and 4 — option (c).
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