How would you utilize blockchain technology in developing a secure recommendation system?
Instruction: Discuss the potential benefits and challenges of integrating blockchain technology to enhance the security and transparency of recommendation systems.
Updated
Example Answer
I would avoid putting browsing history or user preference records on an immutable public ledger. Replicating data can increase disclosure and linkage risks, and permanence complicates correction and deletion. If multiple parties need a shared audit trail, I would first compare a conventional authorized service with a carefully scoped ledger containing minimal references. Consent, access control and off-chain data governance still matter. Smart contracts cannot independently establish that submitted ratings are genuine or that recommendations are useful.
Make it your own
Illustrative requirement test: list the parties, disagreements and audit needs. Keep sensitive histories off-chain; even hashes or identifiers need linkage and dictionary-attack review.
Why this works
Tamper resistance is not confidentiality or ownership. Follow-up: which requirement justifies a ledger instead of a signed, access-controlled log?
Sources: NIST blockchain overview, W3C DID privacy considerations.