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In this paper, Proof of Personhood (PoP) protocols — types of identity verification mechanisms that aim to protect digital space from identity fraud — are explored. The narration starts with an overview of the PoP history, advantages and challenges, and primary use cases. Then, the main identity verification mechanisms, their benefits and limitations are outlined alongside initiatives utilizing them. Finally, a comparison of PoP protocols is provided. By highlighting the potential of PoP protocols to revolutionize the way we see identity verification in the Web3 era, this paper contributes to the ongoing discourse around digital identity and provides a foundation for future research and development in this area.