Trezor Login — Hardware-First, Phishing-Resistant Access

A compact, developer-friendly guide with visual code-style walkthrough and unique UI-inspired components to help you log in safely using your Trezor device.

TREZ

At-a-glance: What makes Trezor login secure?

Private keys are generated & stored only on the Trezor hardware (air-gapped concept).
Login sessions are approved with a physical confirmation on the device (button press or touchscreen).
Supports WebAuthn & cryptographic signing for passwordless, phishing-resistant site authentication.

Pseudo-code: Login flow (browser + Trezor)

// 1. Browser requests WebAuthn assertion
const challenge = server.createChallenge();

// 2. Browser prompts Trezor via WebUSB/WebAuthn
const assertion = await navigator.credentials.get({ publicKey: { challenge, allowCredentials } });

// 3. Trezor prompts user to verify & approve
// — user checks domain and signs on-device

// 4. Browser sends assertion to server for verification
const valid = server.verifyAssertion(assertion);
if (valid) { session.start(); }

Best practice

Always check the domain shown on your Trezor device screen before approving a login or signing transaction.

Quick checklist

Use official site: trezor.io/start
Keep firmware & Suite updated
Never type or share your recovery seed
Verify URL & device prompt every time

Tip: For WebAuthn, Trezor exposes a resident key or user verification option — use it for stronger phishing resistance.

Visual: On-device verification UI (concept)

Trezor Screen

trezor.io
Sign-in request

What to confirm on-device

Exact website domain (no typos or extra characters)
Action type (Login / Sign message / Transaction)
Non-sensitive summary (amount / account name) where applicable

Reject if the domain looks suspicious or the action isn’t expected — physically deny the request on the device.

Common login flows

WebAuthn (recommended)
Browser → site sends challenge → Trezor signs after on-device verification → site verifies signature server-side.

App + Trezor Suite

Trezor Suite detects device → user unlocks device with PIN → Suite loads accounts locally — no sensitive data leaves device.

Developer snippet — verifying signature (server-side)

// Node.js (conceptual)
const crypto = require('crypto');

// server receives: { clientDataJSON, authData, signature, id }
function verifyWebAuthnAssertion(assertion, expectedChallenge, publicKeyPem) {
  const clientData = JSON.parse(Buffer.from(assertion.clientDataJSON, 'base64').toString());
  if (clientData.challenge !== expectedChallenge) throw new Error('Challenge mismatch');
  // verify signature using publicKey from registration
  const verify = crypto.createVerify('SHA256');
  verify.update(assertion.authData + assertion.clientDataJSON, 'base64');
  return verify.verify(publicKeyPem, Buffer.from(assertion.signature, 'base64'));
}

Security reminder: Trezor will never ask for your recovery seed. Approve only requests you initiated.

Learn more at trezor.io/start

Secure Tip

Prefer WebAuthn when available — it reduces phishing risk significantly.