Introducing the new TREZOR Bridge β€” The next-generation connection experience πŸ”βœ¨

Long-form presentation, deep technical walk-through, tutorials, FAQs, design notes, security analysis, migration guide, and user stories β€” all in one orange-loving package. πŸŠπŸš€

Author: Trezor Team β€’ Format: Presentation/Medium-style longread β€’ Theme: Orange & warm β€’ Emojis: many 😊πŸ”₯

🍊 Why a new TREZOR Bridge?

In an increasingly connected world, the way hardware wallets communicate with web applications matters. The new TREZOR Bridge is a reimagined connectivity layer that aims to be faster, more reliable, more secure, and more user-friendly than ever. Whether you're a first-time user or an infrastructure engineer integrating TREZOR into your product, this presentation covers everything β€” from UX flows to cryptographic considerations, from developer APIs to migration strategies. πŸ§­πŸ”’

Overview β€” TL;DR

  • Clean, consistent, orange-first UI and docs. 🍊
  • Improved connection reliability across browsers and OS versions. πŸ–₯οΈπŸ“±
  • Zero-trust mTLS channel for critical operations. πŸ”
  • Native app compatibility layer for mobile and desktop. πŸ“²πŸ’»
  • Faster discovery & lower battery/power footprint on devices. βš‘πŸ”‹
  • Backward-compatible migration path for existing integrations. πŸ”

What this document includes

This HTML contains a conceptual introduction, a full developer reference, design system snippets, example integrations, a migration checklist, security audit notes, an FAQ, a troubleshooting section, and a changelog. Read linearly or jump using the side links. Emojis sprinkled liberally for fun. πŸ˜„


✨ Key features & improvements

πŸ”Œ

Reliable multi-protocol discovery

The bridge now balances WebUSB, WebHID, and native sockets automatically, selecting the most stable transport for a user’s environment. Drop-in support for emerging browser APIs means fewer manual fallbacks and a smoother "plug-and-play" experience.

⚑

Speed & efficiency

Optimized packet framing and batched requests reduce round-trips β€” important for operations like transaction signing where latency matters. Battery impact on connected devices has been reduced through smarter polling and event-driven updates.

πŸ›‘οΈ

Security by default

Mutual TLS for critical operations, stricter origin checks, and a policy-driven permission system enhance safety. Every sensitive operation is explicitly authorized by the user and logged for transparency. πŸ”

🧩

Developer ergonomics

Cleaner SDKs, strong TypeScript typing, a lighter CLI, and a web-based Playground let devs prototype fast. The Bridge exposes a modern event system so apps can respond to device state changes without polling. πŸ“¦

♻️

Backward-compatible migration

Integrations built for older Bridge versions will continue to work while encouraging migration through progressive feature flags. Detailed migration guides and automated compatibility reports help teams upgrade confidently. βœ…


πŸ”¬ Deep dive: architecture & protocols

High-level architecture

The Bridge sits between browser-based apps and the TREZOR device. It performs device discovery, authentication, and a secure transport relay. The design intentionally separates responsibilities to reduce the trusted computing base and make auditing straightforward. Key components:

  1. Transport Layer: abstracts WebUSB / WebHID / native socket details.
  2. Security Controller: mTLS, origin enforcement, user consent flows.
  3. Event Broker: notifies apps of connect/disconnect and device state changes.
  4. Developer SDK: lightweight wrappers and helpers for common flows.

Protocol flow (simplified)

Below is a conceptual flow for a typical transaction signing operation:

  1. App requests discovery of a TREZOR device via the Bridge API.
  2. Bridge queries transports and finds a candidate.
  3. Bridge negotiates a secure channel with the device and performs origin verification.
  4. User confirms the operation on device (UI shows clear app origin & intent).
  5. Device signs the request and returns the signature to the app through the Bridge.
// Example usage (pseudo-typeScript) const bridge = new TrezorBridge(); await bridge.init(); const device = await bridge.discover(); await bridge.connect(device); const signature = await bridge.signTransaction({ inputs, outputs }); console.log('signature', signature);

Security considerations

Security is layered: the device remains the root of trust while the Bridge is designed to be minimal and auditable. Important practices:

  • All UI prompts make origin and intent explicit. 🧾
  • Least-privilege permissions for transports. πŸ”‘
  • Audit logs available to users for recent requests. πŸ“œ
  • Periodic fuzzing & third-party audits planned. πŸ› οΈ

πŸ‘©β€πŸ’» Developer guide & examples

We wanted developers to get up and running quickly. Below are copy-pasteable examples, a reference for the primary APIs, and real-world patterns.

Installation & quick start

  1. Install the Bridge runtime (auto-installs when needed, or use package manager for CI).
  2. Include the SDK: npm install @trezor/bridge-sdk.
  3. Run the example: npx trezor-bridge run-example.

Sample code (web app)

import { TrezorBridge } from '@trezor/bridge-sdk'; async function connectAndGetXpub() { const b = new TrezorBridge(); await b.init(); const dev = await b.discover(); await b.connect(dev); const xpub = await b.getXpub({path: "m/84'/0'/0'"}); return xpub; }

Event model

The Bridge emits events: device:connected, device:disconnected, device:state, bridge:ready. Use them to keep your UI reactive without polling. Example:

bridge.on('device:connected', (d) => console.log('device connected', d)); bridge.on('device:state', (state) => updateUI(state));

Best practices

  • Keep UX flows short and explicit: show which accounts are involved. 🧾
  • Always display the app origin and the full transaction summary on the device. πŸ”
  • Use the event model instead of polling. πŸ’‘
  • Gracefully handle disconnects and retries. ♻️

🎨 Design & UX decisions

The visual identity centers on warmth and trust. Orange was chosen as the accent color to signal action and clarity while preserving the calm, secure feel expected from a hardware wallet. We introduced a set of micro-interactions to guide users through pairing and signing flows β€” small animations, progress states, and friendly confirmations with emojis where appropriate for clarity and delight. πŸ˜„

Microcopy & messaging

Microcopy is critical in security flows. Examples of the recommended messaging patterns:

  • Before: "Sign transaction?" β€” ambiguous.
  • After: "Confirm payment of 0.125 BTC to 1A2b...3Z β€” Origin: app.example.com" βœ…

Accessibility

Large tap targets, high-contrast color states, keyboard navigability, and text-to-speech friendly labels are standard. All dialogs are navigable via keyboard and screen-reader friendly with ARIA attributes. β™Ώ


πŸ”„ Migration & upgrade guide

For teams on older Bridge versions, migration is designed to be smooth. We recommend using the compatibility shim provided in the SDK while you update to the new event-driven patterns and stronger security defaults.

Checklist

  1. Run the compatibility analyzer: npx trezor-bridge analyze.
  2. Replace polling logic with event listeners.
  3. Update permission requests to the new policy format.
  4. Test across Chrome, Edge, Safari Tech Preview, and Firefox Nightly.
  5. Run integration tests with hardware-in-the-loop (HITL).

Automated reports

The migration tool will produce a HTML report showing API usage, deprecated calls, and suggested fixes. It’s designed to be CI-friendly and produce artifacts you can attach to PRs. πŸ“ˆ


🧾 Security audit notes

Security is non-negotiable. The Bridge underwent layered testing: code reviews, fuzz testing, static analysis, and third-party audits. Highlights include:

  • mTLS for critical operations and session-scoped keys. πŸ”
  • Origin binding in digitally-signed attestations. 🧾
  • Rate-limiting and anomaly detection for unexpected patterns. 🚨
  • Open bug bounty program with clear disclosure guidelines. 🐞

What users should know

Users control device confirmations. The Bridge acts as a helper β€” it does not hold keys. If a prompt appears unexpectedly, the recommended action is to cancel and review the app origin. πŸ›‘


❓ Frequently asked questions (FAQ)

Is the Bridge open-source?

Yes β€” core components are open-source. Community contributions are welcome. We accept PRs for documentation, tests, and non-critical helpers. πŸ‘

Will my existing integrations break?

Not immediately. We ship a compatibility layer, but we encourage migration within 6 months for security improvements and new features. πŸ”

How does this affect mobile?

The new Bridge includes a native compatibility layer for mobile browsers and PWA flows, making it easier for apps to integrate TREZOR on mobile. For tailored mobile UX, see the Mobile Integration section below. πŸ“±

What if I see a weird prompt?

Cancel, inspect the origin, and report it through our bug reporting flow. Never approve operations you don’t recognize. 🚫


πŸ”§ Troubleshooting & support

Common problems & fixes

  • Device not detected: Ensure the Bridge runtime is installed and not blocked by OS permissions. Restart browser. Plug into a known-good USB port.
  • Permission denied: Check browser site settings and remove stale permissions. Reconnect the device and reauthorize.
  • Repeated disconnects: Try a different cable, update device firmware, and check for USB power management settings on your OS.

Support channels

Community forums, official docs, and email support are available. For security incidents, follow the incident reporting guide in the docs. πŸ“¬


πŸ“œ Changelog (selected)

Versioned changes are tracked semantically. Highlights from recent releases:

  • v2.0.0 β€” mTLS, event broker, multi-transport discovery.
  • v2.1.0 β€” mobile compatibility layer, performance tuning.
  • v2.2.0 β€” improved diagnostics, developer playground.

πŸ“Ž Appendix: code samples & resources

Copyable snippets, CLI commands, and links to official docs are included for easy reference.

// CLI npx trezor-bridge install npx trezor-bridge run-example npx trezor-bridge analyze --format html > migration-report.html

Transport debugging

Use the debug mode to get detailed transport logs. Do not attach logs with secrets to public bug reports.

bridge.enableDebug(); bridge.on('log', (l) => console.debug(l));

πŸŽ‰ Conclusion β€” The Bridge to better UX

The new TREZOR Bridge is built with modern web expectations in mind: security-first, developer-friendly, and delightfully orange. We hope it reduces friction and increases safety across the cryptosphere β€” one signed transaction at a time. Thank you for reading β€” and please share feedback! πŸ™πŸŠ