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Technical Architecture

Frontend DApp Client​

For the frontend client, we selected Flutter for its ability to generate fast, native-feeling mobile apps for iOS and Android from a single codebase. Flutter provides reactive frameworks like Bloc and Rx for state management and minimal boilerplate code.

The client app UI is built with Flutter widgets like GridView, ListTile, and CurvePainter. We utilize hooks like useState and useEffect for reactive declarations. User authentication leverages Flutter's robust plugin ecosystem - we integrate biometrics and Face ID for login.

The client stores encrypted wallet private keys securely on the mobile device, never transmitting keys to external servers. We use Protobuf for efficient data serialization between the client and backend.

Backend Processes​

The backend DApp server uses Golang for its great performance, scalability, and concurrency support. Goroutines and channels provide powerful primitives for parallelism.

We employ a hexagonal "clean architecture" approach - business logic exists separately from the delivery mechanism. GRPC serves as the RPC framework for communication between the client and server.

For data storage, we selected PostgreSQL for its reliability, ACID compliance, and indexing capabilities. Blockchain data is indexed for quick retrieval.

The server handles tasks like transaction processing, push notifications, and cryptographic functions while the heavy lifting of consensus and mining happens on-chain. The server also caches blockchain data to optimize response times.

Smart Contracts and Blockchain​

At the core of our DApp is a set of Solidity smart contracts deployed to the Ethereum blockchain. We selected Ethereum for its maturity, developer community, and vibrant DeFi ecosystem.

The smart contracts codify business logic like transfering tokens between accounts. We optimized gas costs through efficient logic and storage patterns. All contract code is formally verified using proofs and tools like the Securify analyzer.

Web3.js provides the interface for the client and server to interact with the Ethereum network. We leverage WebSockets for event subscriptions and reactive updates.