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Informational 19 Bitcoin

feat(legacy): send BIP-380 descriptor in GetPublicKey response

Public commit record

What the developer wrote

Authored by Martin Milata

62/100 · Adequate
feat(legacy): send BIP-380 descriptor in GetPublicKey response
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope! No meaningful explanatory body
The short version

What changed, and why it matters

This commit adds a new convenience feature to the older Trezor One (legacy) firmware: when you ask the device for a public key, it now also returns a BIP-380 output descriptor string. This is a standardized way to describe how that public key should be used in Bitcoin wallets. The change is a feature addition, not a fix for a known security bug. It does not change how private keys are handled or how transactions are signed.

Recommended action

No immediate security action required. Treat as a normal feature commit. Reviewers may want to verify the BIP-380 checksum implementation against the reference and confirm that descriptor buffer sizes are sufficient for all supported paths and xpub lengths.

Security signals we found

01

New C string formatting path using snprintf with length checks

02

New BIP-380 checksum implementation translated from HWI Python code

03

Descriptor field enabled in protobuf options (was FT_IGNORE)

04

Display behavior changed for taproot to show descriptor instead of xpub

05

No private-key handling or signing logic modified

Risk score

Why this scored 19/100

Our methodology →
Potential impact 2/30
Exploitability 1/25
Stealth signal 1/15
Affected reach 3/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

Community notes

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