add bip32 derivation fallback when retreiving signing nodes for high-index inputs
What the developer wrote
Authored by Craig Raw
add bip32 derivation fallback when retreiving signing nodes for high-index inputs
What changed, and why it matters
This commit adds a fallback path for finding the correct private signing keys when a Bitcoin wallet handles unusual transaction inputs that use very high address indexes. Without the fallback, Sparrow might fail to locate the right key and therefore be unable to sign a valid transaction the user actually owns. The change is tiny (one line) and appears to be a bug fix rather than a clear security patch, but because it touches key derivation it could affect whether funds can be spent or whether the wallet behaves safely with non-standard inputs.
Review the actual diff in the drongo module to confirm whether the fallback is bounded and does not introduce key-derivation ambiguity or unexpected behavior with hardened vs non-hardened paths. If this is a release commit, consider whether it needs a changelog note for users with high-index wallets.
Security signals we found
Touches private-key derivation / signing-node lookup
Relates to high-index BIP32 derivation paths
One-line change in wallet signing logic
No explicit security wording in commit title or message
Evidence from the diff
The change is in the ‘drongo’ module and adds a BIP32 derivation fallback when retrieving signing nodes for high-index inputs. In Bitcoin wallet implementations, each input in a transaction may specify a derivation path that identifies which private key should sign. For high-index inputs, the existing lookup may miss the correct derivation, so the commit falls back to a BIP32-derived node. This is likely a correctness fix for PSBT or transaction signing with non-trivial derivation paths. The diff is unavailable, so the exact mechanism cannot be verified.
Changed components
drongo moduletransaction signing pathBIP32 derivation lookupInspect captured patch +1 / −1
Diff not available from the source API.Why this scored 39/100
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