Building a Decentralized Application (dApp) for Data Analysis in Bio-Block

Bio-Block is an open-source healthcare data marketplace on Ethereum and IPFS that handles the full upload → anonymize → encrypt → sell → download lifecycle. However, the pipeline stops at download — once a buyer purchases and decrypts a dataset, there is no way to analyze it inside Bio-Block. This project adds a data analytics layer by introducing a dedicated FastAPI Analytics API (port 3003), a lightweight AnalyticsRegistry smart contract for on-chain result tracking, and a React dashboard for visualizations. The system supports three levels of analysis: graphical (distribution plots, heatmaps, scatter plots via matplotlib/plotly), descriptive (summary statistics, correlation matrices via pandas), and inferential (t-tests, chi-square, ANOVA via scipy/statsmodels). Results are stored on IPFS and linked to their source datasets on-chain via the AnalyticsRegistry contract, maintaining an unbroken chain of custody from data purchase through analysis. Deliverables include: (1) Analytics API microservice with EIP-712 authentication, (2) AnalyticsRegistry.sol smart contract deployed on Sepolia, (3) IPFS result storage and on-chain attestation pipeline, (4) Interactive React analytics dashboard integrated into the existing frontend, (5) Comprehensive test suite (80%+ coverage) and documentation. An optional differential privacy layer using OpenDP is planned as a stretch goal.