Trezor Bridge plays a critical but quiet role in hardware‑wallet security: it mediates communication between your computer (or browser-based wallet) and your Trezor device. Instead of exposing raw USB access to web pages or applications, Bridge presents a constrained, authenticated API. That way, apps can request operations but cannot directly interact with low-level device internals. The device itself remains the source of truth — private keys stay sealed in hardware and signing occurs on the device after you personally confirm each action on its screen.
How Bridge works — simply explained
When you initiate an action such as sending cryptocurrency or signing a message, your wallet constructs a request and hands it to Bridge. Bridge forwards the request to the hardware wallet, which then displays transaction details (recipient address, amount, fees, and any metadata) on its secure screen. You must confirm those details physically on the device for the operation to proceed. Because signatures are produced on the device, a compromised host cannot create valid signatures without your manual confirmation.
Private keys never leave the hardware; Bridge only relays structured requests and responses.
On‑device confirmation prevents silent approvals from malicious host applications.
Bridge supports Windows, macOS, and Linux and integrates with the official Trezor Suite and many third‑party wallets for seamless use.
Installation & maintenance
Download Bridge only from official Trezor channels. Installers are available for the major desktop platforms and typically set Bridge to run as a background service. After installation, supported browser wallets and desktop apps should detect your device automatically. Regularly updating Bridge and your device firmware is important — updates include security patches, reliability improvements, and new features, so apply them promptly following vendor guidance.
Practical security tips
- Official builds only: Avoid third‑party mirrors and verify checksums or digital signatures when provided.
- Confirm on‑device: Always verify recipient addresses and amounts on the device display before approving transactions.
- Use trusted hosts: Prefer personal, secure computers over public or shared machines when managing significant funds.
- Backup your recovery seed: Store your recovery phrase offline in a secure, physically protected place; Bridge does not manage backups.
- Keep software updated: Update Bridge, wallet apps, and device firmware regularly to receive security fixes.
Troubleshooting quick fixes
If your browser doesn't detect the device, first ensure Bridge is installed and that its background service is running. Try a different USB cable or port, unlock your Trezor, and reload the page. Disable or temporarily remove browser extensions that might interfere, or try another browser. Restarting the Bridge service or the host computer often resolves transient issues. If problems persist, verify that device firmware and Bridge versions are compatible and consult official support resources for detailed diagnostics.