Cryptoasset Anti-Financial Crime Specialist (CCAS) Certification Practice Test

What does the immutability feature of blockchain mean?

1. No person can change the information or remove the data.

2. Users can always change the data and alter information.

3. Businesses can automatically enforce contracts and agreements.

4. The data and information are decentralized.

The correct answer is: No person can change the information or remove the data.

The immutability feature of blockchain refers to the property that no person can change the information or remove the data once it has been recorded in the blockchain. This means that all transactions and data entries, after they are validated and added to the blockchain, are permanent and cannot be altered or deleted. This characteristic plays a crucial role in enhancing the security and trust of blockchain technology since it provides a verifiable and tamper-proof ledger. In the context of the other choices, the ability for users to change data and alter information directly contradicts the definition of immutability, which would essentially undermine the integrity of the blockchain itself. The aspect of businesses automatically enforcing contracts and agreements aligns more with smart contracts that can be built on top of a blockchain, but it does not directly relate to the immutability characteristic. Lastly, while data being decentralized can describe a feature of blockchain networks, it does not encapsulate the specific meaning of immutability, which strictly pertains to the unchangeability of the recorded information.