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Reviews for World

Human-only reviews: World ID-verified users can leave real, sybil-resistant business feedback.

Reviews for World

Created At

ETHGlobal Prague

Project Description

This project is a Next.js-based mini app built for World App, designed to combat mass botted and fake reviews by requiring every user to verify their humanity with World ID before leaving a comment. The app features a full-screen interactive map where users can search for businesses, view detailed business information, and read or leave reviews.

Key Features:

  • World ID Gating: Only real humans who have verified with World ID can leave reviews, ensuring sybil resistance and preventing bots or fake accounts from spamming the platform.

  • Review System: Users can submit ratings and comments for businesses, but only after passing World ID verification. Each user can only leave one review per business.

  • Business Search & Map: Users can search for businesses and see them displayed on a high-quality, full-screen map. Each business popup shows review statistics and allows navigation to a detailed review page.

  • Modern UI: The app uses the Mini Apps UI Kit and Tailwind CSS for a clean, mobile-friendly, and native-like user experience.

  • Secure Backend: All review submissions are verified server-side for valid World ID proofs, and reviews are only accepted if the proof is valid and unused.

  • Sybil Resistance: The backend checks for duplicate reviews and can optionally store the World ID nullifier hash for further auditability and cross-action sybil resistance.

How it works:

  • A user searches for a business on the map.
  • To leave a review, the user must verify with World ID (using the World App and MiniKit).
  • Upon successful verification, the user can submit a review. The World ID proof is sent with the review.
  • The backend verifies the proof with the Worldcoin Developer Portal API and only accepts the review if the proof is valid and not reused.
  • All users can read reviews, but only verified humans can contribute.
  • This approach ensures that all feedback and reviews are authentic, human-generated, and sybil-resistant, making the platform trustworthy and valuable for everyone.

How it's Made

This project was built using a modern, full-stack TypeScript/JavaScript stack, with a strong focus on sybil resistance and real human verification.

Core Technologies: Next.js (App Router): The backbone of the frontend and backend, providing server-side rendering, API routes, and a seamless developer experience.

React: For building interactive, component-based UIs.

Tailwind CSS: For rapid, utility-first styling and responsive design.

Mini Apps UI Kit: Ensures the app matches World App’s design guidelines and provides a native-like look and feel.

Prisma: Type-safe ORM for PostgreSQL, handling all database interactions and migrations . PostgreSQL: The primary database for storing reviews and business data.

World ID (via MiniKit): The core of the anti-bot system. MiniKit is used on the frontend to trigger World ID verification, and the backend verifies proofs using the Worldcoin Developer Portal API.

Leaflet (react-leaflet): For rendering the interactive, full-screen map and business markers.

OpenStreetMap: As the map tile and business search data provider.

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