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CS Professional · Artificial Intelligence, Data Analytics and Cyber Security - Laws and Practice · Internet and Other Technologies

A blockchain-based land record pilot stores only the hash of each scanned title deed on-chain, while the deed images are kept in an off-chain database. A citizen later asks for correction of an incorrect owner name under data protection principles. Which analysis is most sound?

The sound approach is to correct the off-chain record and append a new on-chain hash entry. Since only hashes sit on the ledger, immutability is preserved while the personal data in the off-chain database can be corrected as data protection principles require.

  1. ACorrection can be made in the off-chain record and a fresh entry with a new hash appended, because only the hash is on-chain and the immutable ledger need not be editedCorrect
  2. BCorrection is impossible because any blockchain data can never be amended in any manner
  3. CCorrection requires deleting the earlier block and re-mining all later blocks on the public network
  4. DCorrection is not required because hashes are not personal data and the off-chain record is outside data protection principles

Explanation

Storing only hashes on-chain with personal data off-chain lets the data fiduciary correct the underlying record and append a new hash entry, reconciling immutability with correction rights. Deleting and re-mining blocks defeats the design, and the off-chain record containing the owner name remains personal data, so the last option is wrong.

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