ParcelProof: Automating Dispute Resolution with AI-Powered Evidence Analysis

ParcelProof is an open-source tool designed to help small online sellers manage customer disputes, such as claims of empty packages. By integrating ElevenLabs for voice transcription and Gemma 4 for evidence analysis, the platform streamlines the process of gathering scattered proof—including WhatsApp voice notes, invoices, and photos. The system uses a Mastra-based workflow to extract events, ground findings in specific file quotes, and generate a spoken briefing for marketplace reviewers. To ensure accuracy, the tool enforces strict rules: findings must be supported by verbatim quotes, and numerical data is verified against confirmed evidence. This approach prevents the model from hallucinating or making unsupported claims. Built with Next.js and MongoDB, ParcelProof provides a transparent, auditable solution that helps sellers defend their cases efficiently, turning complex, multi-source evidence into a structured, professional report that can be easily reviewed by marketplace support teams.