Ethereum client diversity

Client diversity is critical for Ethereum's resilience, and a single client used by 66% or more of validators risks disrupting the chain and causing monetary loss for node operators. A client with 66%+ share that forks can finalize its own chain, and validators who return to the real chain would be slashed, with the penalty being the whole 32 ETH. Clients above 33% share could prevent finalization, so under 33% is the stated goal for every client. Multinode validator clients such as Vero and Vouch are recommended because they require M-of-N connected clients to agree before voting.