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Low 35 Bitcoin

feat: add more info on bitcoin transaction parsing

Public commit record

What the developer wrote

Authored by soralit

62/100 · Adequate
feat: add more info on bitcoin transaction parsing
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope! No meaningful explanatory body
The short version

What changed, and why it matters

This commit improves the Bitcoin transaction review screen on Keystone hardware wallets. It adds clearer warnings and labels when a transaction uses unusual signature modes (SIGHASH_SINGLE or SIGHASH_NONE) or when the fee cannot be calculated exactly (for example, with ANYONE_CAN_PAY inputs). It also fixes a small display issue where line breaks in help text were shown as raw '\r\n' characters. Overall, this is a defensive user-interface improvement rather than an attack.

Recommended action

No urgent action required. Treat as a normal firmware improvement. Users should ensure they review the new warnings on the device before signing Bitcoin transactions, especially those involving partial signatures or market-place/listing transactions.

Security signals we found

01

Adds UI warnings for non-standard Bitcoin sighash types (SIGHASH_SINGLE, SIGHASH_NONE) that can leave outputs unprotected

02

Changes fee display from a fixed numeric value to 'Unknown' or lower-bound indicator when inputs do not fully commit to the fee

03

Adds unit tests for the new sighash detection and fee-boundary logic

04

Fixes help-text line-break rendering (\r\n -> \n) in generated i18n strings

Risk score

Why this scored 35/100

Our methodology →
Potential impact 8/30
Exploitability 5/25
Stealth signal 4/15
Affected reach 7/15
Confidence 7/10
Evidence quality 4/5
Human-validated context

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