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Identity protocols can support costume rental services by issuing verifiable credentials (VCs) to customers, proving eligibility (e.g., age, membership status) via decentralized identifiers (DIDs). Smart contracts track rentals, linking VCs to IoT-enabled lockers for secure costume access. Zero-knowledge proofs verify credentials without exposing sensitive data, while blockchain ledgers maintain transparent usage histories. Deposit VCs automate refunds upon safe return, reducing disputes and administrative overhead.