Abhishek Kochar developed ETH69 protocol version support for the scroll-tech/reth repository, focusing on enhancing Ethereum wire protocol compatibility. He updated message handling and version parsing in Rust, ensuring that NewBlockHashes and NewBlock messages were disallowed for ETH69 to prevent inconsistencies. Abhishek also modified the PooledTransactionsHashesBuilder to accurately reflect transaction pool state under the new protocol regime. His work enabled seamless interoperability with ETH69 clients and supported a smoother upgrade path, reducing the risk of protocol fragmentation. The engineering effort demonstrated a deep understanding of protocol implementation and Ethereum’s evolving standards, delivering robust, targeted improvements within a short timeframe.