UPSC Previous Year Question | Prelims GS | 2026

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:

  1. 1 and 4 only
  2. 1 and 3
  3. 2 and 4 only
  4. 1, 2 and 4

Answer

Correct Answer

1, 2 and 4

Explanation

Blockchain uses distributed ledgers in which copies of records are maintained across network nodes. Cryptographic mechanisms and consensus make unauthorized alteration extremely difficult, while records can be made transparently accessible to relevant participants. The source answer key treats statements 1, 2 and 4 as correct. Statement 3 is not accepted in the source framing because a consortium blockchain is primarily a permissioned blockchain governed by a group of organizations, rather than simply a blend of public and private blockchains.

Topics: blockchain, digital technology, distributed ledger technology, science and technology