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Statement Chat

A simple chat application demonstrating the statement distribution protocol via smoldot light client.

Prerequisites

  1. A running local relay chain with at least one parachain
  2. Chain specs for both the relay chain and parachain

Quick Start

If you have a running local network with polkadot-omni-node or polkadot-parachain:

./dev.sh

The script automatically extracts chain specs, builds smoldot, and starts the dev server at http://localhost:5173.

Manual Setup

  1. Start a local network
  2. Extract chain specs from running nodes
    • public/chain-specs/relay.json
    • public/chain-specs/parachain.json
  3. Run the dev server npm run dev

Usage

  1. Open http://localhost:5173 in your browser
  2. Wait for smoldot to connect to both chains
  3. Enter a topic (32-byte hex) or use the default
  4. Click "Subscribe"
  5. Send messages - they'll be distributed to all peers on the same topic

How It Works

The app uses smoldot's statement store protocol:

  • statement_subscribeStatement - Subscribe to topics on a chain
  • statement_submit - Broadcast signed statements to the network
  • statement_statement (notification) - Receive statements from other peers

Messages are signed with Ed25519 keys (stored in localStorage) and distributed peer-to-peer without central servers.