The ease of creating fake virtual identities plays an important role in shaping the way information — and misinformation — circulates online. Social media platforms are increasingly prominent in shaping public debates, and the tension between online anonymity and accountability is a source of growing societal risks. This article outlines one approach to resolving this tension, with “pseudonym parties” that focus on proof of personhood rather than identity. Pseudonym parties are a low-tech approach to important digital challenges, linking online activity to anonymous digital tokens that are obtained by being physically present at an appointed time and place.