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Identity protocols support equipment rental shops via DIDs linked to VCs for rental eligibility (e.g., "Licensed Driver"), deposit records, and damage history. Customers prove identity (e.g., "Over 21") using ZKPs without sharing personal data. Smart contracts automate checkout/return processes, track usage fees, and enforce penalties for late returns. Blockchain audit trails reduce disputes, while self-sovereign identity (SSI) lets users manage data sharing preferences across rental networks.