ChainCatcher message, Ethereum co-founder Vitalik Buterin explained the limitations of ZK-VM (Zero-Knowledge Virtual Machine) in privacy use cases. Some users pointed out that ZK-VM is superior in almost every aspect, but ironically, the only use case it fails to cover is privacy.In response, Vitalik said: "The explanation is simple: privacy use cases require client-side proofs, and currently, client-side provers are not fast enough to handle anything beyond Merkle branches."