Trézór Bridge®™

Secure crypto connectivity — local transport between hardware wallets and web apps

About Trézór Bridge®™

Trézór Bridge®™ is a lightweight, local application whose purpose is to provide a stable, secure transport layer between compatible hardware wallets and modern web browsers. Bridge addresses the evolving landscape of browser device APIs by offering a consistent local endpoint for WebUSB, WebHID and other transports — enabling web-based wallets and dApps to request transaction signatures while ensuring private keys remain on the hardware device.

Why use a local bridge?

Browsers progressively lock down direct device access for security reasons. A well-designed local bridge reduces friction for legitimate wallets and dApps while minimizing the need for kernel-level drivers or privileged system changes. Because Bridge operates locally, it is able to standardize communication across browsers and operating systems without exposing key material to the network.

Local-first
Runs on your machine; no keys or seeds are uploaded by Bridge itself.
Cross-platform
Support packages for Windows, macOS and Linux; designed for PWAs and browser integrations.
Minimal scope
Bridge relays transport messages only — signing happens on the device.

How Bridge protects your keys

Bridge acts as a translator between browser requests and the physical device. The local software does not derivatively generate or store seed material; it relays APDU-style commands or transport packets to the device. The hardware wallet's secure element is the single source of truth for cryptographic operations and displays transaction details for user confirmation. As long as you verify actions on the device screen, the host can be considered untrusted for transaction authenticity.

Downloads & verification

Only download Bridge from the official vendor releases page or a trusted repository. Attackers occasionally host trojanized binaries on mirror sites, so always verify installer integrity using published checksums and signatures before running any installers.

  • macOS / Linux: shasum -a 256 path/to/file or sha256sum
  • Windows PowerShell: Get-FileHash -Algorithm SHA256 path\to\file
  • To verify GPG signatures: gpg --verify signature.sig file
If the checksum or signature does not match, delete the file and re-download only from the official releases page. Do not run binaries you cannot verify.

Installation & quick start

Installation steps vary by operating system; these condensed instructions emphasize security and user confirmation. Always consult official docs for edge cases and platform-specific caveats.

Windows

  1. Run the signed .exe installer. Confirm the publisher in the UAC prompt before allowing the installer to proceed.
  2. Allow the Bridge process to run and accept local firewall prompts if necessary for local endpoint communication.
  3. Open your browser and a supported web wallet; when prompted, grant the site access to your device while verifying the origin and TLS certificate.

macOS

  1. Mount the .dmg and copy the app to Applications.
  2. On first run, macOS may request permission to access USB devices — approve these prompts only for trusted apps.
  3. Open the browser and proceed to pair your hardware wallet when requested by the wallet UI.

Linux

  1. Make the AppImage executable (chmod +x) or install the distribution package.
  2. On many distros you will need udev rules so non-root users can access USB devices; follow vendor-provided examples.
  3. Start Bridge and open your wallet UI to pair the device.

Security & privacy guidance

Bridge is intentionally narrow in scope — a translator and local transport. Still, safeguarding your funds requires attention to the entire ecosystem: the hardware device, firmware, host operating system, browser, and your behavior. Below are practical, concrete recommendations you can apply immediately.

Installer provenance

Always obtain installers from the vendor's official release page or a verified source control repository. Prefer releases that publish both a checksum and a detached signature. Import the vendor's signing key via an authoritative channel (e.g., vendor website or keyserver) and verify signatures locally before running installers.

Host hygiene

Use Bridge only on machines you control. Keep the host OS and anti-malware software up to date, and avoid doing high-value operations on public or shared computers. Minimize installed software; the fewer background processes that can interact with user-space USB APIs, the smaller your attack surface.

Browser considerations

Grant site permissions for device access only to origins you trust. Revoke permissions when not in use. Beware of malicious extensions that can manipulate web page content; disable or remove extensions you do not need. When possible, use a dedicated browser profile for crypto activity to reduce cross-contamination risks.

On-device verification

The device display is the last trusted UI. Always verify addresses, amounts and fee values on the device before approving a transaction. The host UI may be compromised; on-device confirmations mitigate this risk by showing canonical transaction details rendered by the secure element.

Bridge does not have access to your recovery seed. Signing operations take place on the hardware device only. If any software or site asks you to type your seed into a host, treat it as a critical phishing attempt and stop.

Troubleshooting — common issues & fixes

Most connectivity problems arise from permissions, cables, or service state. Use the steps below to isolate and resolve common failures safely.

Device not detected

Try a different USB cable and a direct USB port on your machine (avoid hubs). Ensure the device powers on and is not in bootloader mode. On Linux, verify udev rules; on macOS, check System Settings for USB permissions; on Windows, check Device Manager and confirm the Bridge service is running.

Browser blocks access

Clear the site's permissions in the browser settings, then reload the page. If you previously denied access, the browser may be retaining that choice. In some cases experimental flags can interfere — avoid toggling flags unless you understand the security implications.

Bridge service not running

Restart the Bridge application. On Windows, use Task Manager or Services; on macOS, use Activity Monitor; on Linux check the process list or journal logs. Reinstall only after verifying the installer's checksum and signature.

Checksum mismatch

If the downloaded file's checksum does not match the published checksum, delete the file, re-download from the official releases page and verify again. If mismatch persists, contact vendor support and do not execute the binary.

Developer & integrator notes

If you are integrating Bridge into a web wallet or dApp, follow secure design patterns: verify origin, serve from HTTPS, use explicit user consent flows, and log minimal metadata. Do not store or log raw transaction payloads or any sensitive information. Respect user privacy and provide clear UI prompts that explain why the device is requested and what the user will be asked to confirm on-device.

Legal & trademark notice

Trézór, Trézór Bridge and other marks may be trademarks of their respective owners. This page is a documentation template and not an official vendor page. Replace trademarks, URLs, checksums, and vendor guidance with your official materials before publishing, and consult legal counsel where appropriate.

Trézór Bridge®™ | Secure Crypto Connectivity

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