币界网报道：Proof-of-Personhood (PoP) systems are emerging as a key solution for establishing unique digital identities in Web3, addressing the challenge of distinguishing humans from bots in decentralized environments. Companies like Worldcoin, backed by Sam Altman, use iris-scanning orbs to verify human uniqueness, while others such as Humanity Protocol employ palm scanning and Polygon's zero-knowledge proofs for privacy-focused verification. These systems aim to enable fair airdrops, governance participation, and bot-resistant online spaces without relying on centralized authorities. However, concerns persist around privacy, accessibility, and potential exclusion of those unwilling to share biometric data. Ethereum co-founder Vitalik Buterin has outlined criteria for ideal PoP systems, emphasizing accessibility, security, and decentralization. As Web3 adoption grows, PoP technologies could become fundamental infrastructure, though their widespread acceptance depends on balancing verification rigor with user privacy protections.