Build on the Presence Layer

use subxt::{OnlineClient, PolkadotConfig};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let api = OnlineClient::<PolkadotConfig>::from_url(
        "ws://127.0.0.1:9944"
    ).await?;

    let block = api.blocks().at_latest().await?;
    println!("Latest block: {}", block.number());
    Ok(())
}

import { ApiPromise, WsProvider } from "@polkadot/api";

const provider = new WsProvider("ws://127.0.0.1:9944");
const api = await ApiPromise.create({ provider });

// Query presence state
const presence = await api.query.presence.declarations(accountId);
console.log("Presence:", presence.toHuman());

curl -H "Content-Type: application/json" \
  -d '{
    "id": 1,
    "jsonrpc": "2.0",
    "method": "state_getMetadata"
  }' \
  http://127.0.0.1:9944