Matt Hess upgraded the Hedera protobuf definitions in the hashgraph/hedera-protobufs repository to support the v0.60 release, focusing on new HINTS and history proofs proto files. He enhanced data structures and security-related features across block, platform, and services, enabling improved network verification and interoperability. Using Protocol Buffers and gRPC, Matt applied schema evolution techniques and coordinated cross-repository changes to align with release requirements. His work emphasized security-focused design and API clarity, preparing the codebase for stable upgrades. Over the month, Matt’s engineering contributed to a more robust, upgrade-ready protobuf ecosystem, though no major bugs were addressed during this period.