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Informational 21 Bitcoin

psbt: add MuSig2 fields

Public commit record

What the developer wrote

Authored by Sjors Provoost

43/100 · Thin
psbt: add MuSig2 fields

Co-Authored-By: Salvatore Ingala <6681844+bigspider@users.noreply.github.com>
✓ Subject identifies a change✓ Provides an explanatory body
The short version

What changed, and why it matters

This commit adds support for new MuSig2 fields in PSBT (Partially Signed Bitcoin Transaction) parsing and serialization. MuSig2 is a multi-signature protocol for Bitcoin. The change is a feature addition that parses and stores new PSBT fields, with length and duplicate checks. There is no direct evidence in the commit that this fixes an active security vulnerability; it appears to be a protocol-support update.

Recommended action

Review as normal feature code. Ensure downstream consumers validate MuSig2 pub nonces and partial signatures cryptographically before using them, since this PSBT layer only checks encoding. No urgent security action is indicated by the commit itself.

Security signals we found

01

New PSBT field parsing with explicit length validation

02

Duplicate-key rejection for new fields

03

No cryptographic verification of MuSig2 nonces/signatures in this diff

04

Feature addition rather than vulnerability patch

Risk score

Why this scored 21/100

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

Community notes

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