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Client Diversity
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Many know client diversity is important for a more resilient network, but they don't understand why or just how essential it is. It's not only important — it's critical. If a single client is used by 2/3rds (66%) of validators, there's a very real risk this can result in disrupting the chain and monetary loss for node operators.
It takes 2/3rds of validators to reach finality. If a client with 66%+ of marketshare has a bug and forks to its own chain, it'll be capable of finalizing. Once the fork finalizes, the validators cannot return to the real chain without being slashed. If 66% of the chain gets slashed simultaneously, the penalty is the whole 32 ETH.
So why is >33% marketshare still undesirable? If a client with >33% marketshare forks, it will prevent the chain from finalizing. That's why <33% marketshare is the goal for all clients.
Execution clients are not immune. The risks mentioned above apply to both consensus clients and execution clients equally.
You can further explore these topics here in case you are interested: https://clientdiversity.org/