New Bitcoin upgrade catches hidden key leaks hiding the exact fix

Bitcoin improvement proposal BIP461 could make a hidden route for leaking wallet secrets easier to detect. The draft defines a common signing procedure for ECDSA, an existing Bitcoin signature scheme.Independent compliant signers should produce identical signatures for the same secret key and message hash, creating a benchmark for detecting departures that could conceal key leakage.Authored by Liam Gilligan, the proposal was merged into the BIPs repository on Sept. 16 and remains marked Draft. Its signatures work under existing Bitcoin consensus rules, so implementing this signing procedure requires no consensus change.Comparing signatures for deviationsECDSA allows a signer choices while creating a valid signature, including the nonce, a temporary value used in signing. Malicious firmware can exploit that freedom to hide key material in signatures that still pass verification, and BIP461 fixes those choices through a specified deterministic procedure.Bitcoin’s acceptance of a signature cannot establish that its creation kept the key safe. A common specification supplies an expected output against which the signer’s behavior can be checked.The comparison requires identical inputs a...