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Informational 17 Bitcoin

Replace CTransaction::operator== with Equals that has options

Public commit record

What the developer wrote

Authored by Ava Chow

81/100 · Strong
Replace CTransaction::operator== with Equals that has options

CTransaction::operator== is only used in a few places. In a few
instances of checking transaction equality, we want to control which
fields are actually being compared, so use a custom Equals() function
which takes a EqualsOptions struct to control the checks.

As suggested in https://github.com/bitcoin/bitcoin/pull/32723#issuecomment-3028112892

Co-Authored-By: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context✓ Links an issue, advisory, or supporting reference
The short version

What changed, and why it matters

This commit is a code cleanup: it replaces a simple transaction equality operator with a more flexible Equals() function that lets callers choose whether to compare signature and witness data. The change does not fix a known bug or vulnerability on its own. It is a refactor that makes future code easier to write correctly, especially in the wallet where transactions need to be compared ignoring signatures.

Recommended action

No immediate action required. Treat as routine refactor. Review future callers of Equals() to ensure EqualsOptions are chosen correctly, particularly anywhere comparing transactions for mempool, consensus, or wallet equivalence.

Security signals we found

01

Refactor of transaction equality semantics

02

Wallet IsEquivalentTo now uses explicit option to ignore scriptSig and witness data

03

Default Equals options preserve prior witness-hash-based equality behavior

04

No bounds, memory, cryptographic, or consensus bug visible in diff

Risk score

Why this scored 17/100

Our methodology →
Potential impact 0/30
Exploitability 0/25
Stealth signal 0/15
Affected reach 5/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

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