During January 2026, Peng Padd focused on enhancing security for the openclaw/openclaw repository by implementing robust signature verification for the LINE webhook integration. Peng introduced a constant-time comparison algorithm in Node.js using TypeScript and JavaScript, addressing timing side-channel vulnerabilities that could compromise webhook reliability. To ensure the effectiveness of this security measure, Peng developed comprehensive tests that verify the rejection of webhooks with invalid or incorrectly computed signatures. This work demonstrates a strong understanding of backend development and API integration, with careful attention to security best practices. The depth of the solution reflects a thoughtful approach to mitigating real-world risks.