During July 2025, Holtzman enhanced the security and reliability of MobileCoin integrations within the Signal-Android and Signal-iOS repositories. He updated enclave measurements and attestation configurations to support MobileCoin v7.x, aligning cryptographic data and security advisories for both mainnet and testnet environments. Working primarily in Java and Swift, Holtzman focused on reducing configuration drift and improving transaction security by replacing outdated service configuration hashes with verified measurements. His work demonstrated depth in cryptography, API integration, and mobile development, paving the way for smoother MobileCoin deployment and long-term maintainability of payment flows across Android and iOS platforms.