The internet allows for anonymous participation. While this is great for protecting people like whistleblowers, it can be a burden if people abuse it and create many fake accounts. This project implements a way to prove that you are a unique individual, while still guaranteeing you anonymity while you use services on the internet. Applications range from chat to e-voting and energy-efficient blockchains.

Fake accounts are a big problem on the internet, while not all people want or can identify themselves using state-issued identities. Proof-of-personhood proposes to use personhood parties where people have to physically show up and get identified as real persons. Using cryptographic primitives, it is then possible to prove that you were part of that group, without revealing your individual identity.