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Informational 18 Bitcoin

feat: add input ref qr

Public commit record

What the developer wrote

Authored by soralit

50/100 · Thin
feat: add input ref qr
✓ Subject identifies a change✓ 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 adds a new user-interface feature for Bitcoin transactions on the Keystone 3 hardware wallet. When a transaction input only provides a 'witness UTXO' (a lightweight proof of the coin being spent), the device now shows a warning asking the user to verify the input value, and offers a QR code that links to the transaction on a public blockchain explorer (mempool.space). This is a defensive UX improvement, not an attack or vulnerability fix. It helps users spot potentially fraudulent input amounts but does not change the underlying signing logic.

Recommended action

No urgent action required. Treat as a normal feature review. Verify that the 128-byte url buffer is sufficient for the mempool.space URL plus txid (https://mempool.space/tx/ + 64 hex chars + null fits with margin), and that input_txid is always a valid 64-character hex txid before formatting. Consider whether fetching or displaying an external explorer URL could be used in a social-engineering attack, and ensure the QR code cannot be triggered by untrusted data during signing.

Security signals we found

01

New user-facing warning for witness-only UTXO inputs

02

New per-input txid/vout exposure through FFI structs

03

UI now links to external mempool.space URL via QR code

04

No signing or cryptographic validation logic changed

05

No buffer-size validation visible around 128-byte url and 160-byte outpoint snprintf_s calls

Risk score

Why this scored 18/100

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

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