Hashgraph Ontology

Machine-interpretable OWL ontologies modelling the Hedera Network and Hiero architecture, including services, governance, tokens, consensus, and smart contracts.

Base IRI: https://hashgraphontology.xyz/

Core Modules

Consensus Service

Hedera Consensus Service (HCS) – topics, messages, sequence numbers, and submit-key access control.

Core Ontology

Upper-level classes and properties capturing shared Hedera and Hiero network concepts, including identity, governance, transactions, and data-export semantics.

File & Schedule Service

Hedera File Service for on-ledger file storage and Scheduled Transactions for time-deferred execution.

Hiero Architecture

Hiero overlay and Hedera node software architecture – services, nodes, and platform abstractions.

Mirror Node Analytics

Mirror node ecosystem – REST queries, analytics events, streaming state, and data-export semantics.

Smart Contract Service

Hedera Smart Contract Service (HSCS) – EVM-compatible contracts, bytecode, ABI, and gas semantics.

Token Service

Hedera Token Service (HTS) – fungible and non-fungible tokens, supply management, KYC, and freeze semantics.

Alignment Modules

AIAO Alignment

Bridge module aligning Hedera concepts with the Anthropogenic Impact Accounting Ontology (AIAO).

ClaimOnt Alignment

Bridge module aligning Hedera attestation patterns with the Claim Ontology (ClaimOnt).

ImpactOnt Alignment

Bridge module aligning Hedera-native concepts with the Impact Ontology (ImpactOnt).

InfoComm Alignment

Bridge module aligning Hedera messaging semantics with the Information Communication Ontology (InfoComm).

Prefix Declarations

Canonical prefix declarations shared across all Bhash ontology modules.

External Ontology Imports

DCAT

W3C Data Catalog Vocabulary – imported dependency used for dataset and distribution semantics.

PROV-O

W3C Provenance Ontology – imported dependency used for activity, agent, and entity provenance.