What does immutability mean in the context of blockchain technology?

What does immutability mean in the context of blockchain technology?

• A. Transactions can be altered by any node
• B. Once confirmed, transactions cannot be changed or erased
• C. All transactions are stored in a central server
• D. Transactions can be deleted after a certain time

Answer: (B)

In the context of blockchain technology, immutability refers to the characteristic that once a transaction has been confirmed on the blockchain, it cannot be changed or erased. This feature ensures the integrity and security of the data within the blockchain, making it a reliable source of truth. When transactions are added to a blockchain, they are cryptographically linked to previous transactions, forming a chain of blocks that is secure by design. Altering any transaction would require changing all subsequent blocks, which is practically impossible due to the distributed nature of blockchain and the consensus mechanisms in place. This permanent record of transactions enhances trust among participants, as everyone can independently verify the data without the risk of tampering. The other options do not accurately describe immutability in blockchain. For instance, the idea that transactions can be altered by any node contradicts the core principle of immutability. Similarly, storing transactions in a central server or allowing for deletion after a certain time would undermine the foundational aspect of permanent record-keeping essential to blockchain functionality.

In the context of blockchain technology, immutability refers to the characteristic that once a transaction has been confirmed on the blockchain, it cannot be changed or erased. This feature ensures the integrity and security of the data within the blockchain, making it a reliable source of truth.

When transactions are added to a blockchain, they are cryptographically linked to previous transactions, forming a chain of blocks that is secure by design. Altering any transaction would require changing all subsequent blocks, which is practically impossible due to the distributed nature of blockchain and the consensus mechanisms in place. This permanent record of transactions enhances trust among participants, as everyone can independently verify the data without the risk of tampering.

The other options do not accurately describe immutability in blockchain. For instance, the idea that transactions can be altered by any node contradicts the core principle of immutability. Similarly, storing transactions in a central server or allowing for deletion after a certain time would undermine the foundational aspect of permanent record-keeping essential to blockchain functionality.