staySafe

Problem Statement

staySafe is a privacy-preserving platform for global hostel bookings. It allows travelers to prove they hold a valid passport — without ever revealing the actual document — using zero-knowledge proofs (ZKPs) with Safe protocola. This protects user privacy while giving hostel owners confidence in the legitimacy of their guests.What makes StaySafe unique is its compliance layer. Hostel owners can configure rules to:1)Restrict bookings from specific countries2)Enforce OFAC compliance by excluding sanctioned regions3))Setting gender-specific dorms, where only women can book women-only dorms and men can book men-only dorms3)Avoid collecting sensitive documents like passports or personal identity dataAll bookings happen on-chain, and users must verify identity privately using a Self zk protocol, The verification proves key traits (e.g. valid passport with its attributes to query and verify onchain) while keeping the user fully anonymous, can share those which matters maintaining privacy.Country Restrictions: Hostel owners set a list of banned countries in their dashboardOFAC Compliance: Owners can enable an OFAC mode, automatically preventing bookings from sanctioned countriesGender-Specific Dorms: Owners can specify that only women can book women’s dorms, and only men can book men’s dorms These conditions are enforced before booking, using ZK proof validation, but no passport details are exposed to the owner

Solution

So we use 1)Smart Contracts (Solidity on Celo),Using the Self.xyz onchain SDK, a onchain solidity library within hardhat env. 2) Built using Next.js and TailwindCSS, with Wagmi for seamless wallet integration, enabling smooth user interactionsOwner Controls:Country Restrictions: Hostel owners set a list of banned countries in their dashboardOFAC Compliance: Owners can enable an OFAC mode, automatically preventing bookings from sanctioned countriesGender-Specific Dorms: Owners can specify that only women can book women’s dorms, and only men can book men’s dormsThese conditions are enforced before booking, using ZK proof validation, but no passport details are exposed to the owner