UPSC Prelims 2026 · GS Paper 1 · Question 86
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 :
Correct answer: Option C
Science & Technology
Options
- (a) 1 and 3
- (b) 2 and 4 only
- (c) 1, 2 and 4
- (d) 1 and 4 only
Detailed solution
Answer
Option (C) — Statements 1, 2 and 4 are correct
Explanation
- Blockchain is a decentralized and distributed ledger technology that securely records transactions across many computers.
- Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data, ensuring high security.
- The technology eliminates the need for a central authority, offering transparency, immutability, and traceability for various applications.
Statement Analysis
- Statement 1. Records stored in the database may be made visible to relevant stakeholders without risk of alteration: Correct. The use of cryptography and consensus mechanisms ensures that stakeholders can view records transparently while the data remains completely immutable.
- Statement 2. Copies of the entire database are stored on multiple computers on a network syncing within seconds: Correct. Blockchain functions as a distributed ledger where every participating node on the network maintains a full, continuously synced copy of the database.
- Statement 3. Consortium blockchain is a blend of public and private blockchains allowing selective data access: Incorrect. A hybrid blockchain is the exact blend of public and private networks. A consortium blockchain is specifically a permissioned network governed by a predefined group of organizations rather than a single entity.
- Statement 4. Mathematical algorithms make it impossible to change or delete any data once recorded and accepted: Correct. Cryptographic hashing creates a unique digital fingerprint for each block, meaning any alteration attempts will invalidate the entire subsequent chain.