Q. 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:
(a) 1 and 3
(b) 2 and 4 only
(c) 1, 2 and 4
(d) 1 and 4 only

Answer : C

Explanation:

Statement 1 is correct: Blockchain is a distributed, transparent, secure, and immutable database. It’s records are accessible across a network, making them visible to relevant stakeholders while being resistant to tampering or alteration.
Statement 2 is correct: Blockchain is accessible across a network of computers, copies of the entire database are stored and distributed across multiple nodes (computers) on the network.
Statement 3 is not correct: It is Hybrid Blockchain not Consortium blockchain which is described as a blend of public and private blockchains allowing selective data access. Consortium blockchain is semi-decentralized and governed jointly by multiple organizations for shared data management and validation.
Statement 4 is correct: Once a transaction is recorded on the blockchain, it cannot be modified or deleted. Mathematical/cryptographic algorithms make the blockchain an immutable and tamper-proof ledger that provides a high degree of security and trust.

Sources:

https://www.pib.gov.in/PressReleasePage.aspx?PRID=2182023

https://www.studocu.com