币界网报道:Ethereum founder Vitalik Buterin wrote an article discussing the pros and cons of the zero-knowledge proof identity system (ZKID). He pointed out that although ZKID can effectively prevent Sybil attacks and protect privacy, the "one person, one identity" model still has problems such as privacy leakage, coercion risks and system errors. The ideal solution should be a multi-identity system between "proof of wealth" and strict identity verification, where the cost of obtaining N identities should be N².