```mermaid
flowchart TD
    Homeserver[Matrix\nHomeserver]
    Contracts <-- Node.js blockchain\nclient library (ethers) --> API
    Contracts <-- Web-based blockchain client library\n(MetaMask / Casper Wallet)--> WebApp
    Contracts <-- Web-based blockchain client library\n(MetaMask / Casper Wallet)--> Widget
    WebApp <-- HTTPS --> API
    Widget <-- HTTPS --> API
    Widget <-- Element-web Widget API\n(npm matrix-widget-api) --> Homeserver
    API <-- Matrix Client-Server Protocol\n(npm matrix-bot-sdk) --> Homeserver
```