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Use this page to disambiguate vocabulary used across guides and API docs. For stack positioning, read Core concepts and Product and SDK map.

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Identity and trust

Stable identifier for an entity, often in the did:ixo: namespace; see Identity and credentials.
Standard registration for a digital twin: DID, type, protocol, controllers, metadata; see Core concepts — Domains and Entity domains.
The modeled counterpart of a real-world subject on the stack; see Digital twins.
Structured assertion with evidence, evaluated under protocol rules; see Claims.
Issuer-signed, verifier-checkable credential about a subject DID; see Credential issuance.
Party authorized to update a DID document or domain record within protocol rules; see Identity and credentials.

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Organizations and workflows

Programmable organizational domain—a secure place for people, agents, and services to cooperate; see PODs.
Governed sequence of steps coordinating work; see Core concepts and user guides such as Build a flow.
Reusable protocol template (rules, rubrics, evidence expectations); see Build a blueprint.
Verification, measurement, or decision-support capability—often AI-assisted; see IXO Oracles and Oracle architecture.

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APIs and infrastructure

A concrete interface family (for example RPC or a specific REST service); see API introduction.
Node-level access to IXO Protocol state and transactions (RPC, REST over gRPC); compare the matrix in API introduction.
Operator-hosted HTTP or GraphQL services over indexed or app-layer data (Blocksync, Registry, Matrix state bot, USSD); auth varies by deployment (Authentication matrix).
Indexed query layer for chain-derived data; see IXO Blocksync and Blocksync GraphQL API.
Encrypted cooperation and data-room layer; see IXO Matrix.
Application API for Impact Hub Registry workflows; see Registry and Registry API.

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Cooperation layer

Intelligent cooperating system over IXO-backed state—workspaces, tools, governed automation; see Qi.
Model of connected verifiable state; see IXO Graph.

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Roles (human-facing)

High-level roles (Developer, Evaluator, Funder, and others) are described in Your role. Use that page when deciding who submits claims, who verifies, and who funds programs.