Hive is an open source Ethereum end-to-end test harness designed to execute comprehensive integration tests on Ethereum clients, ensuring consensus, peer-to-peer, and blockchain compatibility. Maintained by the Ethereum Foundation, Hive comprises two primary instances dedicated to diverse testing protocols: eth1 consensus, GraphQL, and peer-to-peer tests hosted at https://hivetests.ethdevops.io, in addition to Engine API integration and RPC tests available at https://hivetests2.ethdevops.io. By identifying bugs and abnormalities in client implementations, Hive serves as a pivotal tool for validating Ethereum client stability and interoperability. The project’s unique contribution model adheres to the Collective Code Construction Contract (C4), facilitating an experimental and adaptive approach to community-driven development. Licensed under the GNU General Public License v3.0, Hive encourages transparent collaboration and progressive improvement of Ethereum infrastructure.