Trezor Bridge — Connect Securely To Trezor Devices

What Is Trezor Bridge?

Trezor Bridge is a lightweight communication daemon that serves as an intermediary between your computer and Trezor hardware wallets. It exposes a local interface accessible by web browsers and desktop apps to exchange encrypted commands with the wallet.

Developers rely on this mechanism to interact with the hardware wallet without manually handling USB protocols or browser-specific limitations. The Bridge ensures a uniform environment across Windows, macOS, and Linux.

Bridge API Overview

Bridge communicates through a local HTTP service (default: 127.0.0.1:21325), exposing endpoints to perform actions such as enumeration, signing, and transaction verification. Common endpoints include:

/enumerate

Lists all connected Trezor devices, their path, and firmware version.

/status

Returns the health and operational state of the Bridge process.

/listen

Streams live device connection or disconnection events.

Basic Example — Checking Bridge Status

        curl http://127.0.0.1:21325/status/

        → Returns JSON data showing version and process status.

This is often used to confirm that Bridge is active before initializing connection requests from your app.

Integrating Bridge with Node.js or Python

You can send JSON-RPC requests from your backend or frontend apps to control the wallet. For example:

        Node.js Example:

          const axios = require('axios');

          const res = await axios.get('http://127.0.0.1:21325/enumerate');

          console.log(res.data);

Python developers can use requests in a similar way to automate balance checking or signature creation tasks.

Security Best Practices

Always connect through Trezor Suite for verified communication.
Never modify the Bridge binary manually.
Validate firmware fingerprints before signing transactions.
Use https://trezor.io/start for official setup instructions.

Bridge never handles private keys directly; all signing occurs inside the hardware wallet’s secure enclave. Even a compromised system cannot extract keys or seed phrases.

Advanced Usage for Exchanges & dApps

Many exchanges integrate Trezor devices to allow direct withdrawal confirmations or multisig operations. Bridge APIs allow signed transaction blobs to be generated locally, then broadcast via custom endpoints.

DeFi applications leverage this for token swaps, while cold storage platforms utilize it for audit logging of all signature requests. Developers can monitor Bridge logs for performance tuning using --verbose mode.

Testing & Debugging Bridge

Use the /status endpoint to confirm Bridge uptime.
Monitor logs located in ~/.config/trezord/.
Restart Bridge if your OS updates its USB driver layer.
Check GitHub Source for open issues and PRs.

Bridge in Enterprise Environments

In large organizations, Bridge can be deployed across multiple workstations using a centralized management script. Admins can check service health via network scans and automate version updates from official Trezor downloads.

This is particularly valuable in compliance-based operations such as crypto custodians, fund managers, or accounting firms where hardware-based signing must remain verifiable and isolated.

Conclusion

Trezor Bridge is far more than a background service — it’s a foundational API layer connecting secure hardware to web technologies. Whether you’re building wallets, DeFi dashboards, or institutional custody tools, the Bridge API ensures every cryptographic instruction remains verifiable and tamper-proof.

Download the latest build today at trezor.io/bridge and explore developer documentation at suite.trezor.io.