Ethereum

One intriguing idea I learned during ZuConnect and ZuSocial was "pseudonym parties", first proposed by Bryan Ford & Jacob Strauss in 2008 to address the conflict between anonymity and accountability. It provides proof of personhood to pseudonyms without revealing their underlying identity.

Here's the idea: multiple events take place at the same time, all giving participants digital certificates; since one can only appear at a particular physical location at the same time, these certificates are valid proof of personhood.

The paper: https://bford.info/pub/net/sybil.pdf

Working on and thinking about decentralized social media and digital public spaces

POAPs are already used in @gitcoin Passport and other systems as proofs of personhood, without reliability. With pseudonym parties, events only need to coordinate on timing, to turn POAPs into valid proofs. This could even become a basis for community formation.