Trezor devices provide an auditable, hardware-backed environment for secure key storage and transaction signing. Designed for individuals and enterprises, Trezor's transparent design prioritizes privacy, reproducibility, and the most essential security principle: you control the keys.
Trezor splits responsibilities: the host constructs transactions; the device validates and signs. Private keys never leave the device. The device enforces user confirmation via a screen and physical input, making silent signing impossible.
// Example: signing flow (simplified)
1. Host: build canonical tx
2. Host -> Device: request signing (path + tx blob)
3. Device: display tx details to user
4. User: approves on device
5. Device: produce signature & return to host
Assume the host (computer, phone) may be compromised. Use the device's display to verify transaction destination and amount. Protect your recovery seed: never type it into a computer or store it online. Use a passphrase to create a hidden wallet when plausible deniability or account separation is required. For organizational use, prefer multisig and hardware-signed policies.
Integrate over HID or WebUSB; communicate using well-defined JSON or binary messages. Always validate returned signatures locally. Bind a nonce or challenge to requests to mitigate replay. When building custodial services, treat Trezor as a signing module and design redundancy and recovery into the architecture.
// APDU-style (conceptual)
{ "method":"sign_tx", "params":{ "path":"m/84'/0'/0'/0/0", "tx":"..." }}