Worked on upgrading the Hedera protobuf definitions to version 0.60 in the hashgraph/hedera-protobufs repository, focusing on enhancing data integrity and network verification. Delivered new proto files for HINTS and history proofs, strengthening data structures and security-related capabilities across block, platform, and services. The work involved careful schema evolution using Protocol Buffers and gRPC, with an emphasis on security-focused design and cross-repository coordination. This upgrade prepared the network for improved interoperability and reliability, aligning the release process for future stability. The engineering approach demonstrated expertise in API design and blockchain development, with attention to release management and maintainability.