Use this page to disambiguate vocabulary used across guides and API docs. For stack positioning, read Core concepts and Product and SDK map.
Identity and trust
Decentralized Identifier (DID)
Stable identifier for an entity, often in the did:ixo: namespace; see Identity and credentials.
Domain (entity domain)
Standard registration for a digital twin: DID, type, protocol, controllers, metadata; see Core concepts — Domains and Entity domains.
Digital twin
The modeled counterpart of a real-world subject on the stack; see Digital twins.
Claim
Structured assertion with evidence, evaluated under protocol rules; see Claims.
Verifiable credential (VC)
Issuer-signed, verifier-checkable credential about a subject DID; see Credential issuance.
Controller
Party authorized to update a DID document or domain record within protocol rules; see Identity and credentials.
Organizations and workflows
POD
Programmable organizational domain—a secure place for people, agents, and services to cooperate; see PODs.
Flow
Governed sequence of steps coordinating work; see Core concepts and user guides such as Build a flow.
Blueprint
Reusable protocol template (rules, rubrics, evidence expectations); see Build a blueprint.
Oracle
Verification, measurement, or decision-support capability—often AI-assisted; see IXO Oracles and Oracle architecture.
APIs and infrastructure
API surface
A concrete interface family (for example RPC or a specific REST service); see API introduction.
Protocol gateway
Node-level access to IXO Protocol state and transactions (RPC, REST over gRPC); compare the matrix in API introduction.
Service API
Operator-hosted HTTP or GraphQL services over indexed or app-layer data (Blocksync, Registry, Matrix state bot, USSD); auth varies by deployment (Authentication matrix).
Blocksync
Indexed query layer for chain-derived data; see IXO Blocksync and Blocksync GraphQL API.
IXO Matrix
Encrypted cooperation and data-room layer; see IXO Matrix.
Registry
Application API for Impact Hub Registry workflows; see Registry and Registry API.
Cooperation layer
Qi
Intelligent cooperating system over IXO-backed state—workspaces, tools, governed automation; see Qi.
IXO Graph
Model of connected verifiable state; see IXO Graph.
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.