CFA Level I · CFA Level I Exam · Introduction to Digital Assets
Which feature of a blockchain most likely makes it difficult to alter a past transaction record undetected?
The hash link between blocks makes altering past records hard to hide. Each block holds the previous block's hash, so changing an old transaction breaks all subsequent links and is quickly detected. Central storage or clearing house settlement does not provide this tamper-evident property.
- AEach block contains a hash of the previous block, linking the chainCorrect
- BEach block is stored by only one designated central node
- CEach transaction is settled through a clearing house before recording
Explanation
Because each block includes the previous block's hash, changing an old record changes its hash and breaks every later link, making tampering evident. Storage on a single node would weaken immutability, and clearing house settlement is a traditional intermediated process, not a blockchain feature.
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