13. Workflow and Communication Flow

1. Client Request

Users interact with the frontend (Web, Mobile, etc.) by sending API requests (HTTP or GraphQL).

2. Gateway/API

NestJS controller accepts the request; routes it to the relevant service.

3. Auth Middleware

If protected route, JWT Authentication via passport-jwt triggers.

4. Business Logic

Service layer performs logic: querying DB via Prisma, caching results in Redis if needed.

5. Blockchain Interaction

If required, services use Ethers.js (Ethereum) or Solana Web3.js (Solana) to read/write blockchain data.

6. Database Ops

Prisma used for CRUD operations with relational DB.

7. Response

API server returns final response (JSON for REST or data structure for GraphQL).