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Low 27 Bitcoin

transaction: rename tx.is_segwit() to tx.is_any_segwit()

Public commit record

What the developer wrote

Authored by SomberNight

65/100 · Adequate
transaction: rename tx.is_segwit() to tx.is_any_segwit()

Some callers might want the "any" usage, some might want "all".
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides an explanatory body
The short version

What changed, and why it matters

This commit is a code cleanup that renames a method from is_segwit() to is_any_segwit() and adds a clarifying comment. It does not change the actual behavior of the code. The rename makes it clearer that the method returns true if any input is SegWit, not necessarily all inputs. A developer left a note in the Lightning channel funding code saying the current check should eventually use an 'all inputs are SegWit' check instead. On its own, this commit is not a security fix, but it highlights a place where the code's understanding of SegWit malleability could be imprecise.

Recommended action

No immediate action is required for this commit. Monitor the follow-up that addresses the FIXME in lnpeer.py, because funding transactions that mix SegWit and non-SegWit inputs could leave the channel funding txid malleable. If reviewing a release, verify whether the FIXME has been resolved before treating the Lightning funding flow as fully non-malleable.

Security signals we found

01

Rename-only refactor of SegWit detection method

02

Added FIXME in Lightning channel funding flow noting current check uses 'any' semantics where 'all' may be desired

03

Added comment explaining residual malleability of non-SegWit inputs in a partially SegWit transaction

04

No functional change to serialization, size estimation, or validation logic

Risk score

Why this scored 27/100

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

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