Distributed Blockchain Exchange Platform Development

Designed and built a distributed digital asset exchange platform where multiple browser clients maintain independent blockchain copies, synchronized through a custom consensus protocol over SignalR WebSockets.

The system runs entirely in the browser via Blazor WebAssembly. Each client stores its own blockchain in IndexedDB and validates transactions locally using a UTXO model. A SignalR messaging hub coordinates peer discovery, block propagation, and multi-node consensus (minimum 3 nodes). Smart contracts are compiled dynamically from C# at runtime and executed within the Blazor sandbox.

Payment processing integrates Stripe for fiat-to-token conversion, triggering certificate minting through the smart contract layer. Authentication uses X.509 client certificates with JWT token exchange.

Real-time peer-to-peer messaging hub handling transaction payloads with MessagePack serialization

Dynamic C# smart contract compilation and execution in WebAssembly

Custom consensus protocol with automatic reconnection and failure recovery

Multi-currency support (AUDC, USDC, BTC, ETH) with Stripe payment integration

Azure Functions serverless API for peer coordination, orders, and webhook processing

Full multi-client E2E test harness using isolated Chrome profiles with remote debugging