What is Trezor Bridge?
Trezor Bridge is a lightweight, secure application that enables communication between your computer and your Trezor hardware wallet®. Acting as an official gateway, Bridge handles device detection, firmware updates, and transaction signing flows while minimizing exposure to your private keys. It is designed to be simple, trustworthy, and interoperable across operating systems.
Why Bridge matters for security
While the hardware wallet keeps private keys offline, the host computer still needs a secure channel to request actions (like signing a transaction) and push verified firmware. Trezor Bridge provides this channel with careful design choices: limited permissions, signed firmware verification, minimal attack surface, and clear user prompts. Correct Bridge use prevents man-in-the-middle attacks and reduces phishing surface.
How Bridge works (high level)
- Detects Trezor over USB and establishes a local, authenticated channel.
- Coordinates firmware downloads and verifies signatures before flashing.
- Relays transaction requests from apps to the device for on-device approval and signing.
- Closes connections when sessions end to minimize exposure.
Install & update Bridge
Always download Bridge from the official domain. After installation, Bridge runs quietly in the background and activates only when a Trezor device is connected. When updates are available, the official site guides you through an authenticated update flow that includes signature verification and user consent.
Best practices for Bridge and device security
- Download Bridge only from the official Trezor domain and verify HTTPS certificate.
- Verify firmware signatures before any update — Bridge will display verification steps.
- Avoid unofficial third-party bridges or modified clients that bypass verification.
- Keep your operating system and Bridge up to date to reduce attack surface.
Troubleshooting common Bridge issues
If Bridge fails to detect your device: confirm USB cable and port, try another computer, and ensure no VPN or firewall is blocking local connections. Reinstall Bridge if necessary and consult official logs. If firmware update fails, do not disconnect mid-flash — follow official recovery instructions carefully.
Privacy and logging
Bridge is built to minimize telemetry. It typically communicates locally and only downloads signed firmware from official servers. Any logs created are meant to assist debugging and should be shared with support only when necessary and sanitized of private information.
Bridge for developers
Developers can interact with Bridge’s local API to build desktop clients, wallet integrations, or automation tooling. Always follow the official API patterns and respect user consent flows — never sign transactions without explicit on-device confirmation by the end user.
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