# Personhood credentials: Artificial intelligence and the value of privacy-preserving tools to distinguish who is real online

arXiv: https://arxiv.org/abs/2408.07892 · HTML: https://mlsanity.com/paper/2408.07892/

## Key facts

- Cited by 16 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 15 Aug 2024.

## Built on by (most cited first, 16 of 16)

- [Authenticated Delegation and Authorized AI Agents](https://mlsanity.com/paper/2501.09674/) (2025)
- [Infrastructure for AI Agents](https://mlsanity.com/paper/2501.10114/) (2025)
- [Virtual Agent Economies](https://mlsanity.com/paper/2509.10147/) (2025)
- [How malicious AI swarms can threaten democracy: The fusion of agentic AI and LLMs marks a new frontier in information warfare](https://mlsanity.com/paper/2506.06299/) (2025)
- [Identity Management for Agentic AI: The new frontier of authorization, authentication, and security for an AI agent world](https://mlsanity.com/paper/2510.25819/) (2025)
- [A Pragmatic View of AI Personhood](https://mlsanity.com/paper/2510.26396/) (2025)
- [Among Them: A game-based framework for assessing persuasion capabilities of LLMs](https://mlsanity.com/paper/2502.20426/) (2025)
- [Build Agent Advocates, Not Platform Agents](https://mlsanity.com/paper/2505.04345/) (2025)
- [AI and the Future of Digital Public Squares](https://mlsanity.com/paper/2412.09988/) (2024)
- [AI Identity: Standards, Gaps, and Research Directions for AI Agents](https://mlsanity.com/paper/2604.23280/) (2026)
- [Personhood Credentials: Human-Centered Design Recommendation Balancing Security, Usability, and Trust](https://mlsanity.com/paper/2502.16375/) (2025)
- [Data-Driven Breakthroughs and Future Directions in AI Infrastructure: A Comprehensive Review](https://mlsanity.com/paper/2505.16771/) (2025)
- [The End of Trust: How Agentic AI Breaks Security Assumptions](https://mlsanity.com/paper/2605.16436/) (2026)
- [Internalising the Identity Primitive: Cryptographic Individuality for an Autonomous Agent on a Public Blockchain](https://mlsanity.com/paper/2608.02986/) (2026)
- [Agent Inheritance Protocol: Speculating on Feralized Agents After Principals Die](https://mlsanity.com/paper/2608.15403/) (2026)
- [Afterlife Delegation Protocol: Speculative Design of Self-Sovereign Agents that Outlive Their Principals](https://mlsanity.com/paper/2608.15405/) (2026)

## Abstract (arXiv)

Anonymity is an important principle online. However, malicious actors have long used misleading identities to conduct fraud, spread disinformation, and carry out other deceptive schemes. With the advent of increasingly capable AI, bad actors can amplify the potential scale and effectiveness of their operations, intensifying the challenge of balancing anonymity and trustworthiness online. In this paper, we analyze the value of a new tool to address this challenge: "personhood credentials" (PHCs), digital credentials that empower users to demonstrate that they are real people -- not AIs -- to online services, without disclosing any personal information. Such credentials can be issued by a range of trusted institutions -- governments or otherwise. A PHC system, according to our definition, could be local or global, and does not need to be biometrics-based. Two trends in AI contribute to the urgency of the challenge: AI's increasing indistinguishability from people online (i.e., lifelike content and avatars, agentic activity), and AI's increasing scalability (i.e., cost-effectiveness, accessibility). Drawing on a long history of research into anonymous credentials and "proof-of-personhood" systems, personhood credentials give people a way to signal their trustworthiness on online platforms, and offer service providers new tools for reducing misuse by bad actors. In contrast, existing countermeasures to automated deception -- such as CAPTCHAs -- are inadequate against sophisticated AI, while stringent identity verification solutions are insufficiently private for many use-cases. After surveying the benefits of personhood credentials, we also examine deployment risks and design challenges. We conclude with actionable next steps for policymakers, technologists, and standards bodies to consider in consultation with the public.