BIP461 Merged to Enhance Bitcoin Wallet Security
The proposal aims to detect wallet key leaks by standardizing ECDSA signing procedures for Bitcoin users.
Updated on Oct. 1, 2026 in Cybersecurity
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Liam Gilligan merged Bitcoin Improvement Proposal BIP461 into the BIPs repository on September 16, 2026. The draft proposal introduces a deterministic signature procedure to prevent malicious firmware from embedding seed material.
Why it matters
Malicious firmware can currently exploit nonces in ECDSA signatures to hide sensitive key material while still passing verification. This proposal provides a standardized defense against such covert data leaks.
The proposal mandates a deterministic procedure for ECDSA signatures, capping signature size at 70 bytes in standard DER encoding. This change requires no modifications to existing Bitcoin consensus rules.
The players
Liam Gilligan
Liam Gilligan is the developer responsible for merging the Bitcoin Improvement Proposal BIP461.
The details
The procedure fixes signature choices through a deterministic algorithm, allowing independent signers to compare output against an expected benchmark. By using identical inputs, the system ensures that key material cannot be surreptitiously embedded in signature data.
Timeline
September 16, 2026: The proposal was formally merged into the BIPs repository.
The Tech Race
The development represents a shift toward more rigid, deterministic security standards within the Bitcoin ecosystem. It moves the industry away from flexible signature generation that legacy systems previously allowed, effectively closing a known vulnerability in signing hardware.
Users will eventually benefit from increased security in their hardware wallets, as the protocol makes it harder for compromised devices to leak private keys. There are no immediate changes to user workflows or costs until the proposal reaches Complete status.
The takeaway
This update highlights the ongoing necessity for strict, deterministic standards to prevent supply-chain attacks on security hardware. Users should ensure their wallet software remains updated to benefit from these evolving cryptographic protections.
Further reading
Learn more about the latest developments in Cybersecurity.
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