XID

Sistema / Design de Identidade

Novel decentralized identifier architecture — "eXtensible IDentifier" — defined as a unique 32-byte identifier for a subject entity (person, organization, device, or any abstract subject), generated from the SHA-256 hash of an inception key. XIDs resolve to XID Documents — Gordian-Envelope-encoded controller documents that bind the identifier to public keys, permissions, endpoints, and delegation rules — and inherit Envelopes selective elision so the controller document can be tailored per-recipient. The defining architectural insight is that holders, not issuers, control which parts of the controller document are revealed to which counterparties. Intentionally not W3C DID-conformant: XIDs are research/architectural exploration positioned alongside (not within) the W3C DID paradigm. Recently extended with "Edges" (BCR-2026-003) to support web-of-trust attestations between XIDs

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Detalhes

Licença BSD-2-Clause Plus Patent License — bc-xid-rust reference library; bc-envelope-cli tooling supports XID operations
Status de Dev 📝 Rascunho
Detalhe do Status de Dev Research / pre-spec — partial reference implementation in bc-xid-rust; "open for community feedback"; Q1 2026 Blockchain Commons report describes XIDs as "one of our largest current projects" Reclassified 2026-09-14: 'research/pre-spec' plus only a 'partial' reference implementation is well below Beta's bar — spec-stage with experimental-only code matches Draft.
Proprietário Blockchain Commons LLC (not-for-profit benefit corporation founded by Christopher Allen, April 25, 2019; Berkeley, California). Specification author: Wolf McNally, Lead Researcher
Órgão de Governança Blockchain Commons LLC (not-for-profit benefit corporation)
País USA (Berkeley, California)
Ano de Início 2024
Stack Rust (bc-xid-rust); integrated with bc-envelope, provenance-mark crates
Financiamento Blockchain Commons donations and patron sponsorships
Última Investigação 14 de set. de 2026

Domínios de Caso de Uso

Identidade e Confiança

Capacidades

Prova de humanidade Portabilidade do grafo de confiança Identidade soberana

Sistema / Design de Identidade Atributos

Origens Blockchain Commons; built on the Gordian Envelope architecture; influenced by but explicitly diverging from W3C DID Core
Banco de Dados N/A — controller documents are Envelope artifacts; persistence is implementation concern (registry, web URL, blockchain, peer-shared via Garner)
Linguagem de Consulta N/A directly — Envelope's selective-disclosure mechanism via inclusion proofs effectively functions as the query model; recipients receive only the parts of the controller document the holder chooses to reveal
Formatos de Dados CBOR (deterministic via dCBOR); 32-byte identifier tagged with CBOR tag #6.40024; XID Documents as Gordian Envelopes
Suporte Móvel Yes — libraries cross-compile to mobile platforms; Envelope tooling on mobile via BCSwiftEnvelope
Suporte Web Yes — TypeScript library (xid by Leonardo Custodio); web-compatible Envelope serialization
Aplicativos Nativos CLI tooling (bc-envelope-cli with XID operations); Garner system for publishing identity content
Termos Open research, BSD-2-Clause Plus Patent License
Fundos Unknown — funded under Blockchain Commons general operating budget; specific XID allocation not separately published
Baseado Em Gordian Envelope (controller documents); dCBOR (deterministic encoding); SHA-256 (inception-key-derived identifier); Provenance Marks (versioning); FROST (group signing); SSKR (recovery)
Autenticação e Identidade Self-certifying identifier — the XID is the SHA-256 hash of an inception public key, providing cryptographic proof of origin while allowing keys to be rotated without changing the identifier
Modelo de Armazenamento XID Documents resolved via dereferenceVia assertions (HTTPS resolvers, BTCR, IPFS, Hubert dead-drops, etc.); decentralized resolution; holders can publish elided versions to different recipients
Interoperabilidade Inspired by but intentionally not conformant to W3C DID Core; standalone architecture leveraging Gordian stack; can encode dereferenceVia URIs to existing W3C DID resolvers as a bridge
Portabilidade de Dados By design — identifier is portable (hash of inception key, no registry binding); controller document portable via Envelope encoding; selective-disclosure subsets cryptographically verifiable independent of full document
Governança e Tomada de Decisão Holder-controlled — architectural commitment that the identifier holder, not the issuer, controls disclosure; this is fundamentally a different governance model from issuer-mediated SSI flows
Padrões de Identidade Self-defined (Blockchain Commons Research papers BCR-2024-010 and BCR-2026-003); not W3C DID Core; not OIDC
Métodos DID Suportados XIDs are not a DID method; XID Documents can reference other DID-resolvable URIs via dereferenceVia
Gestão de Chaves Inception key + rotated keys with permission flags; FROST threshold signing for group XIDs; SSKR recovery shares
Tipos de Credenciais Edges (BCR-2026-003) — signed Envelope-wrapped attestations between XIDs forming a web-of-trust graph; can carry any Envelope-encodable credential format
Método de Verificação Cryptographic verification via Envelope signatures; controller document elision preserves Merkle digest for proof of original content
Recursos de Privacidade Selective elision per recipient (Merkle-tree privacy); holder-controlled disclosure rather than issuer-controlled; non-correlation across contexts via tailored documents
Métodos de Autenticação Public-key signatures rooted in XID-document keys; Permits (Envelope encryption) for confidential exchanges
Mecanismo de Revogação Key rotation (XID stable across rotations); permission flag updates in controller document; provenance-mark-chained Editions track XID Document versions
Tipos de Agentes Suportados People, organizations, devices, applications, abstract entities — domain-agnostic
Tipos de Carteira/Cliente CLI tooling; reference apps in development; Garner publishing system
Mecanismos de Recuperação SSKR-based shard recovery; FROST threshold-based recovery; multi-key inception possible
Conformidade / Regulamentações Not yet evaluated — XID is a research note (BCR-2024-010) rather than a standardized identity protocol; architectural design supports privacy-by-design and data-minimization principles compatible with GDPR
Protocolos de Troca de Credenciais Envelope-native — assertions exchanged as Envelope artifacts; could be carried over DIDComm or other credential exchange protocols if wrapped in those formats
Estrutura de Confiança Self-sovereign — no central authority; web-of-trust via Edges (BCR-2026-003); Permits for context-specific trust
Modelo de Custo No cost (self-generated); resolution costs depend on chosen dereferenceVia method
Resistência à Censura High — autonomous identifier generation, decentralized resolution options including Hubert dead-drops on BitTorrent/IPFS