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Where is the hash tree used?

(a) in digital currency

(b) in sorting of large data

(c) for indexing in databases

(d) in encryption of data

The question is from Hash Tables topic in section Hash Tables of Data Structures & Algorithms I

I have been asked this question during an internship interview.

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Correct option is (a) in digital currency

The best I can explain: Using Hash tree the data verification, data synchronisation and the consistency verification can be done efficiently. So, the hash tree are digital currencies to organise the transactions.

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