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Low 43 Bitcoin

nits

Public commit record

What the developer wrote

Authored by scgbckbone

0/100 · Opaque
nits
! Very short subject! Too few words to establish purpose! No meaningful explanatory body! Opaque security-relevant change
The short version

What changed, and why it matters

This commit fixes a PIN-uniqueness check in the COLDCARD's 'Seed Vault / Secure Spending Policy' setup. Previously, when a user picked an unlock PIN, the code only compared it against the main PIN and visible 'trick' PINs, but missed hidden trick PINs. That could let the same PIN be used for two different security features, which can cause confusion or allow a hidden trick PIN to silently override the intended unlock behavior. The patch now asks the secure element (SE2) whether the PIN is already in use anywhere before accepting it.

Recommended action

Treat this as a low-to-moderate security hardening fix. Verify that `tp.get_by_pin()` correctly returns a slot for every stored trick PIN, including hidden, duress, and brick-me PINs, and that the new test `test_use_trick_pin_as_unlock` passes on both Q1 and legacy hardware variants. Consider whether any previously created SSSP configurations could have reused a hidden trick PIN and advise users who rely on trick PINs to review their settings after updating.

Security signals we found

01

PIN uniqueness check bypassed for hidden trick PINs

02

Secure-element (SE2) lookup added to enforce global PIN uniqueness

03

New regression test specifically covers hidden trick PIN collision

04

Duplicate error message refactored into shared helper

Risk score

Why this scored 43/100

Our methodology →
Potential impact 12/30
Exploitability 8/25
Stealth signal 6/15
Affected reach 7/15
Confidence 7/10
Evidence quality 3/5
Human-validated context

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