Which technology is described as a tamper-evident ledger for verified data?

Which technology is described as a tamper-evident ledger for verified data?

• A. Blockchain
• B. Cloud
• C. Artificial intelligence
• D. Internet of Things

Answer: (A)

The main idea being tested is how a tamper-evident, verifiable data record is created and maintained. Blockchain achieves this by organizing data into blocks that are cryptographically linked to the previous block, forming an immutable chain. The ledger is distributed across many participants, and new blocks are added only after consensus. Tampering with past data would break the chain’s hashes and require overcoming the network’s consensus, which is practically impossible, making any change evident and the history verifiable. That combination of cryptographic linking, distributed validation, and an append-only structure is what gives the data its trusted, tamper-evident nature. The other options—cloud storage, artificial intelligence, and the Internet of Things—do not inherently provide this tamper-evident, verifiable ledger mechanism.

The main idea being tested is how a tamper-evident, verifiable data record is created and maintained. Blockchain achieves this by organizing data into blocks that are cryptographically linked to the previous block, forming an immutable chain. The ledger is distributed across many participants, and new blocks are added only after consensus. Tampering with past data would break the chain’s hashes and require overcoming the network’s consensus, which is practically impossible, making any change evident and the history verifiable. That combination of cryptographic linking, distributed validation, and an append-only structure is what gives the data its trusted, tamper-evident nature. The other options—cloud storage, artificial intelligence, and the Internet of Things—do not inherently provide this tamper-evident, verifiable ledger mechanism.