# System Overview

ZDrive is built on a Cloudflare Worker that acts as the routing and trust boundary layer between the browser client and all backend services. It handles request routing, wallet identity verification, rate limiting, credit checks, and proxying to TEE inference and Arweave storage.

## Component diagram

```mermaid
graph TB
    subgraph Client["Browser"]
        UI[React SPA]
        AES["AES-256-GCM\nEncryption"]
        ONNX["ONNX Embeddings\n(all-MiniLM-L6-v2)"]
        WM["Base Wallet\n(ERC-1271)"]
    end

    subgraph CF["Cloudflare Edge"]
        W["CF Worker\nzdrive.io"]
        KV["KV Store\n(rate limits)"]
        ASSETS["CF Assets\n(app.zdrive.io SPA)"]
    end

    subgraph Inference["TEE Inference"]
        CHUTES["Chutes.ai\nIntel TDX TEE"]
    end

    subgraph Storage["Decentralized Storage"]
        IRYS["Irys node2"]
        ARWEAVE["Arweave\n(permanent)"]
    end

    subgraph Chain["Base Network"]
        CONTRACT["ZDriveXCreditsV2\n(UUPS Proxy)"]
    end

    UI -->|"Encrypted requests"| W
    WM -->|"ERC-1271 signature"| W
    W -->|"Rate check"| KV
    W -->|"Credit check / consume"| CONTRACT
    W -->|"Proxy inference (SSE)"| CHUTES
    W -->|"Signed DataItem"| IRYS
    IRYS --> ARWEAVE
    ASSETS -->|"SPA bundle"| UI
    AES -.->|"Ciphertext only"| W
    ONNX -.->|"Browser-side RAG"| UI
```

## Request routing

The CF Worker inspects the hostname and path to route every request:

```mermaid
flowchart TD
    REQ[Incoming Request] --> HOST{Hostname?}
    HOST -->|"app.* or stg-app.*"| SPA[Serve SPA from CF Assets]
    HOST -->|"zdrive.io / stg.zdrive.io"| PATH{Path?}
    PATH -->|"/v1/* or /vault/*"| API[API Handler]
    PATH -->|"/robots.txt"| ROBOTS[robots.txt]
    PATH -->|"/sitemap.xml"| SITEMAP[sitemap.xml]
    PATH -->|"/llms.txt"| LLMS[llms.txt]
    PATH -->|"*"| LANDING[Landing Page HTML]
    API --> AUTH{Auth valid?}
    AUTH -->|No| 401
    AUTH -->|Yes| TIER{Tier?}
    TIER -->|"Paid"| INFERENCE[Full model inference]
    TIER -->|"Free / Connected"| FREE[Qwen3-32B inference]
```

## Environments

| Environment | Domain                                | Notes                      |
| ----------- | ------------------------------------- | -------------------------- |
| Production  | `zdrive.io` / `app.zdrive.io`         | Base mainnet, live credits |
| Staging     | `stg.zdrive.io` / `stg-app.zdrive.io` | Base Sepolia testnet       |


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