POP - Proof of Purchase

The problem it solves

The current warranty system is broken both from a technical and user experience perspective. As developers, we deal with fragmented data across retailers, manufacturers, and support systems, making it hard to build unified, verifiable ownership or warranty logic. There is no shared standard to track warranties or purchases, which leads to complexity in integration and verification. For users, this means lost receipts, unregistered products, and rejected warranty claims. Brands face challenges like warranty fraud, lack of insights into product usage after sale, and missed opportunities to build loyalty. In real-world scenarios, secondhand buyers can't prove ownership, support teams struggle to validate claims, and no one has a reliable, cross-platform way to manage post-purchase value.

Challenges we ran into

While building this system, one of the main challenges was creating a unified warranty layer that works seamlessly across on-chain and off-chain flows. Handling NFT minting with dynamic metadata, while keeping the process gas-efficient and secure, required precise smart contract design and event handling. Another issue was building a backend that could validate ownership and warranty logic without relying solely on blockchain reads, to ensure performance and scalability. On the real-world side, verifying sellers and preventing fake or unauthorized warranty registrations was tricky, especially in a decentralized setup. We also had to account for expired warranties, resale cases, and delayed claims, all while maintaining a user-friendly experience. Balancing technical complexity with usability across wallets, IPFS, and smart wallets added significant friction during implementation.