Personhood Credentials (PHCs)

Protocolo Semântico e de Dados

A verifiable credential type specifying claims that attest a credential holder is a real, unique person within an issuing ecosystem (e.g., a government, employer, university, or nonprofit community). PHCs add a credential-type semantic layer on top of the W3C Verifiable Credentials Data Model, defining what data a personhood credential carries and how its claims are structured for cross-ecosystem interpretation. Originally proposed in the August 2024 'Personhood Credentials' paper as a response to generative AI's ability to defeat CAPTCHAs and impersonate humans; being standardized by the Decentralized Trust Graph Working Group (DTGWG), a joint ToIP-DIF working group .

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Detalhes

Licença N/A — specification document, not source code; reference implementations in OpenVTC (Apache-2.0) and other FPP-ecosystem projects are open source
Status de Dev 📝 Rascunho
Detalhe do Status de Dev Draft / Standardization in progress (specification under development at DTGWG; multiple reference implementations underway including in the First Person Project ecosystem and OpenVTC)
Proprietário Specification origin: 27 multi-institutional authors of the August 2024 Personhood Credentials paper led by researchers from MIT, OpenAI, Microsoft, Harvard, UC Berkeley, and other institutions. Standardization: Decentralized Trust Graph Working Group (DTGWG) — joint ToIP-DIF Working Group
Proprietário - Lista
  • Trust Over IP Foundation
Órgão de Governança Decentralized Trust Graph Working Group (joint ToIP–DIF working group) | None (originating multi-institutional author group spanning MIT, OpenAI, Microsoft, Harvard and UC Berkeley; not itself a governing body)
País International (multi-institutional academic and industry collaboration)
Ano de Início 2024
Stack N/A — specification, not implementation
Financiamento Specification work supported by sponsoring organizations of the DTGWG (ToIP, DIF, Linux Foundation Decentralized Trust, Customer Commons, Ayra Association); original paper produced by academic and industry research collaboration
Financiamento - Lista
  • Decentralized Identity Foundation
  • Trust Over IP Foundation
Última Investigação 1 de jul. de 2026

Visão de topologia

Esta ferramenta no centro e o que se relaciona diretamente com ela. Cada linha nomeia o tipo de relação.

Visão de topologia: Personhood Credentials (PHCs)Esta ferramenta no centro e o que se relaciona diretamente com ela. Cada linha nomeia o tipo de relação.PersonhoodCredentials…DIDComm (Base de)DIDCommFirst Person Project / Network (Base de, Implementações em conformidade, Protocolo falado por)First PersonProject / Ne…OpenID for Verifiable Credentials (OpenID4VC) (Base de)OpenID forVerifiable C…OpenVTC (Base de, Implementações em conformidade)OpenVTCVCs (Baseado em, Construído sobre, Está em conformidade com, Fala o protocolo)VCsVerifiable Relationship Credentials (VRCs) (Base de)VerifiableRelationship…JSON-LD (Construído sobre, Fala o protocolo)JSON-LDDIDs (Está em conformidade com)DIDsTrust Over IP Foundation (Desenvolvido por, Financiado por)Trust OverIP FoundationDecentralized Identity Foundation (Financiado por, Hospedado em)DecentralizedIdentity Fou…

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Domínios de Caso de Uso

Cocriação e Conhecimento

Capacidades

Atestações portáteis Prova de humanidade

Protocolo Semântico e de Dados Atributos

Proprietário - Lista
  • Trust Over IP Foundation
Origens Proof of personhood / Decentralized identity (response to generative AI defeating CAPTCHAs and traditional bot-detection; alternative to centralized biometric solutions like Worldcoin)
Banco de Dados N/A — credentials are stored in user-controlled digital wallets; no centralized database is part of the specification
Linguagem de Consulta N/A — credential exchange uses standard VC presentation/verification protocols rather than a query language
Formatos de Dados W3C Verifiable Credentials Data Model (JSON-LD by default; JWT/SD-JWT serializations also possible per the underlying VC spec); zero-knowledge proof presentations for threshold-based unique-personhood proofs
Edição Colaborativa em Tempo Real N/A
Edição de Texto Rico N/A
Suporte Móvel N/A — credentials can be presented from any wallet on any platform; the specification is platform-agnostic
Suporte Web N/A — same as above
Aplicativos Nativos N/A — same as above
Termos Free open standard (no licensing fees for adoption)
Financiamento - Lista
  • Decentralized Identity Foundation
  • Trust Over IP Foundation
Fundos N/A — open standard, no funding round
Baseado Em W3C Verifiable Credentials Data Model (the underlying credential framework PHCs extend); W3C Decentralized Identifiers (for issuer and holder identity); Personhood Credentials paper, August 2024 (originating specification); zero-knowledge proof cryptography (for threshold-based unique-personhood verification)
Compatibilidade com a Web Semântica Full (built on W3C Verifiable Credentials Data Model, which uses JSON-LD as its primary serialization; PHC claims are expressed as RDF-compatible structured data)
Maturidade / Padronização do Protocolo W3C Draft / DTGWG standardization track (originating paper August 2024; specification work ongoing in the Decentralized Trust Graph Working Group, a joint ToIP-DIF participation Working Group; expected to produce a formal W3C-track specification)
Tipo de Vocabulário / Ontologia Identity attestation / Proof of personhood (specifies a credential-type vocabulary for attesting that the holder is a real, unique person within a given issuing ecosystem)
Padrão de Uso Embedded in other protocols (PHCs are exchanged via standard VC issuance and presentation protocols such as OpenID4VC and DIDComm; the specification defines the semantic content of a particular credential type rather than its transport)

Relacionamentos

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Baseado em
Construído sobre
Desenvolvido por
  • Trust Over IP Foundation
Está em conformidade com
Fala o protocolo
Financiado por
  • Decentralized Identity Foundation
  • Trust Over IP Foundation
Hospedado em
  • Decentralized Identity Foundation
Base de
Implementações em conformidade
Protocolo falado por