EventFi

Inspiration

EventFi was inspired by the frustration of ticket fraud, scalping, and event access issues in both physical and digital spaces. We wanted to create a secure, blockchain-powered ticketing solution where ownership is verifiable and tamper-proof — much like NFTs, but with real-world utility.

What it does

EventFi enables users to purchase, store, and access event tickets securely on the blockchain. Each ticket is tied to a verified wallet address, preventing unauthorized transfers and fake copies. Even for live events, users can still make purchases without losing access control.

How we built it

• Backend: Node.js with Express for APIs, integrated with a blockchain (CELO) for NFT-style ticket verification.
• Frontend: React + TypeScript for a responsive user interface, with real-time updates for ticket ownership.
• Security: Middleware checks in server/app.js and server/routes/tickets.js to ensure only verified owners can access their tickets.
• Database: PostgreSQL for storing event and user metadata.
• Deployment: Hosted on Render for the server and Vercel for the frontend.

Challenges we ran into

• Preventing direct URL access to tickets without verification.
• Ensuring zero caching for sensitive ticket data while maintaining performance.
• Allowing live event purchases without breaking ownership checks.
• Integrating blockchain verification seamlessly without slowing down the user experience.

Accomplishments that we're proud of

• Successfully blocked all unauthorized ticket access attempts.
• Created a clean, intuitive UI for event browsing and ticket management.
• Achieved smooth blockchain integration for ticket verification.
• Maintained fast load times despite added security layers.

What we learned

• Fine-tuning server caching rules for security-critical endpoints.
• Efficient blockchain API calls for real-time verification.
• Balancing UX with security in event platforms.
• Handling edge cases where events are live but still accepting purchases.
• https://github.com/Chrispin-m/Eventfi ## System Architecture ```mermaid graph TD A[User] -->|Buys Ticket| B[React Frontend] B -->|API Request| C[Express Server] C -->|Verify Wallet| D[Blockchain Network] C -->|Fetch Event/Ticket Data| E[PostgreSQL DB] D --> C E --> C C -->|Authorized Ticket Data| B B -->|Display Secure Ticket| A

Built With

• crossfi
• typescript
• web3