How does a blockchain ledger different from a normal bookkeeping ledger?
This technical question is asking you to compare two different types of ledgers. The assumption is that you know what a blockchain ledger is and what a bookkeeping ledger is, even though bookkeeping principles are not part of the job description. This is an example of how interviewers can ask you about anything during an interview. If you're not prepared to answer a question about a specific topic, the best thing to do is to acknowledge this and then describe how you would go about locating the information.
"The difference between a blockchain ledger and a bookkeeping ledger is that a blockchain ledger is distributed across many nodes. This keeps them secure and verifies the information since one node can be compared to each of the others. Bookkeeping ledgers are typically a single source. This makes them prone to errors and open to security threats. Another difference is that the actions associated with blockchain ledgers are performed automatically, whereas bookkeeping ledger entries are performed manually and usually require human intervention."
