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Informational 20 Bitcoin

rpc: Support version 3 transaction creation

Public commit record

What the developer wrote

Authored by Bue-von-hon

68/100 · Adequate
rpc: Support version 3 transaction creation

Adds v3 support to the following RPCs:
- createrawtransaction
- createpsbt
- send
- sendall
- walletcreatefundedpsbt

Co-authored-by: chungeun-choi <cucuridas@gmail.com>
Co-authored-by: dongwook-chan <dongwook.chan@gmail.com>
Co-authored-by: sean-k1 <uhs2000@naver.com>
Co-authored-by: ishaanam <ishaana.misra@gmail.com>
✓ Descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context
The short version

What changed, and why it matters

This commit adds a new 'version' parameter to several Bitcoin Core RPCs so users can create version 3 transactions. It is a feature addition, not a bug fix. The code validates that the requested version is within the allowed standard range and applies sensible defaults, so it does not appear to introduce a security vulnerability.

Recommended action

No immediate security action required. Treat as a normal feature review: verify the version bounds match network policy, ensure RPC help text is accurate, and confirm tests cover edge cases such as omitted version and out-of-range values.

Security signals we found

01

Input validation added: version is bounded to standard range before use

02

New RPC parameter exposed: increases attack surface slightly but is guarded

03

No memory safety, authentication, or consensus-critical changes observed

04

sendall adds compatibility check for unconfirmed v3 (TRUC) inputs

Risk score

Why this scored 20/100

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

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