A curated list of proof of personhood approaches.
- Personhood: The Killer Credential? : Blog post by Eve Maler describing the impact of a personhood credential on the decentralized ecosystem.
- Personhood credentials: Artificial intelligence and the value of privacy-preserving tools to distinguish who is real online : Made in August 31, this paper was created with 31 authors and leaders from the Identity space. It explores the problem space and expresses the importance of a solution, without explicitly defining the solution.
- What do I think about biometric proof of personhood? : Blog post in July 2023 from Vitalik Buterin about his thoughts on biometric proof of personhood.
- Aadhaar : Aadhaar is India’s national biometric identification system, managed by the Unique Identification Authority of India (UIDAI). It provides a 12-digit unique identity number for residents based on fingerprint and iris scans, aiming to streamline access to government services and prevent identity fraud.
- Worldcoin: Worldcoin’s World ID is a decentralized digital identity verified through biometric iris scans. This project aims to enable equitable access to digital economies and prevent fraud and Sybil attacks.
- Humanode: Humanode combines facial recognition biometrics with blockchain technology to create a proof-of-personhood mechanism.
- Gitcoin Passport : Users collect “stamps” from different authenticators around web2 and web3, such as Bright ID, Proof of Humanity, Twitter, and Google to form a reputation score.
- Idena: Idena employs regular checkpoint rituals — synchronous validation sessions — to certify a participants’ humanness for the consequent epoch. The validation requires solving of flips-puzzles easy for a human, difficult for a bot.
- Greencheck : provides a bot-resistant representation of you that can be used across communities and independent of application, completely under your control by building a graph of claims with validation.
- Proof of Humanity: similar to Bright ID, a system combining social verification with video submission to create a Sybil-proof list of humans.
- Bright ID: similar to proof of humanity, a system combining social verification with video submission to create a Sybil-proof list of humans.
- Circles : An approach to solve the UBI problem using crypto-currency. Individuals vouch for eachother to form a trust network.
- Encointer: A Swiss association. Participants in each Encointer community are randomly assigned to periodic small, physical gatherings at a randomly selected location in their local area. When it commences, each participant scans the QR code of the other attendees to confirm their presence and the attestations are recorded on the highly secure Kusama blockchain ledger. As all Encointer gatherings take place at the same time, it is impossible to attend more than one event during each cycle. This makes it impossible to validate more than one Encointer account.
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