Electrum Server

Rebar Data operates a full Electrum protocol server, giving lightweight wallets and applications efficient access to Bitcoin blockchain data without running a full node.

Capabilities

• Address history — Full transaction history for any address
• UTXO queries — Unspent outputs for balance computation
• Transaction broadcast — Submit signed transactions
• Block headers — Retrieve and verify headers for SPV validation
• Fee estimation — Current fee rate estimates
• Subscriptions — Real-time notifications when an address receives or spends funds

When to Use Electrum

Use Case	Recommended Interface
Wallet backends	Electrum
Real-time balance monitoring	Electrum (subscriptions)
Payment processing	Electrum
SPV verification	Electrum
Metaprotocol queries	REST API
Analytics and batch queries	REST API or GraphQL

Connection Details

Host	ELECTRUM_HOST_PLACEHOLDER
Port	ELECTRUM_PORT_PLACEHOLDER
Protocol	SSL

Connecting Your Wallet

Electrum Wallet

1. Open Electrum and go to Tools > Network
2. Uncheck Select server automatically
3. Enter ELECTRUM_HOST_PLACEHOLDER as the server and ELECTRUM_PORT_PLACEHOLDER as the port
4. Click Close — the wallet will reconnect using Rebar's server

Sparrow Wallet

1. Open Sparrow and go to File > Preferences > Server
2. Select Private Electrum Server
3. Enter ELECTRUM_HOST_PLACEHOLDER for the URL and ELECTRUM_PORT_PLACEHOLDER for the port
4. Ensure Use SSL is enabled
5. Click Test Connection, then Close

BlueWallet

1. Open BlueWallet and go to Settings > Network > Electrum Server
2. Enter ELECTRUM_HOST_PLACEHOLDER:ELECTRUM_PORT_PLACEHOLDER
3. Save and restart the app

BDK (Bitcoin Dev Kit)

Configure BDK's Electrum backend to point at Rebar's server:

use bdk_electrum::electrum_client::Client;

let client = Client::new("ssl://ELECTRUM_HOST_PLACEHOLDER:ELECTRUM_PORT_PLACEHOLDER")?;

JavaScript / TypeScript

Using the electrum-client-js library:

import { ElectrumClient } from "electrum-client-js";

const client = new ElectrumClient(
  "ELECTRUM_HOST_PLACEHOLDER",
  ELECTRUM_PORT_PLACEHOLDER,
  "ssl"
);

await client.connect();