Overview
ISO/TS 23258:2021 - Blockchain and distributed ledger technologies - Taxonomy and Ontology defines a structured classification (taxonomy) and a formal conceptual model (ontology) for blockchain and distributed ledger technologies (DLT). The technical specification organizes DLT knowledge into multi-level concept taxonomies (concepts, DLT systems, application domains, purposes and economic activity sections) and provides ontology classes, attributes and relations (for example Ledger, Distributed ledger, Blockchain, Block). The document is intended for a broad audience including academics, architects, tool developers, regulators, auditors and standards bodies.
Key topics
- Taxonomy of concepts: a hierarchical classification of DLT building blocks (assets, tokens, smart contracts, consensus, nodes, governance, ledger status, etc.) that maps terms to ISO vocabulary (ISO 22739 and related work).
- Taxonomy of DLT systems: classification criteria and major characteristics for comparing DLT implementations (consensus mechanisms such as PoW, PoS, DPoS; fault tolerance/BFT variants; node roles and platform attributes).
- Taxonomy of application domains and use cases: cross‑sector domains, use‑case purposes and economic activity sections to classify real-world DLT deployments.
- Ontology: formal classes, attributes and relationships to model DLT concepts (e.g., Ledger, Distributed ledger class, Blockchain class, Block class; block header, hash, Merkle root, nonce, block height, timestamp, block status).
- Supportive annexes: informative classification examples and contextualization of use‑case classification to aid practical adoption.
- Interoperability and governance: taxonomy entries covering interoperability types (syntactic, semantic, behavioral) and governance mechanisms (decentralized control, incentive models).
Applications and who uses it
ISO/TS 23258:2021 is useful for:
- Architects and developers designing or evaluating DLT platforms who need standardized terminology and classification to compare options.
- Tool vendors and integrators building analytics, modelling or interoperability tools that rely on consistent ontologies.
- Regulators, auditors and compliance teams assessing legal, governance and operational aspects across DLT systems.
- Researchers and educators needing a reference taxonomy and ontology for studies, classification and benchmarking.
- Enterprise decision-makers and customers selecting DLT solutions based on consensus model, governance, privacy and economic activity fit.
Practical uses include DLT solution comparison, requirement mapping, ontology‑driven data models, interoperability planning, risk assessment and harmonizing terminology across projects.
Related standards
- ISO 22739 - Blockchain and distributed ledger technologies: Vocabulary (referenced as the normative source for terms).
- ISO/TC 307 deliverables - the specification aligns with other ISO/TC 307 standards and informs terminology, governance and interoperability work across the DLT standards ecosystem.
Keywords: ISO/TS 23258:2021, blockchain taxonomy, DLT ontology, distributed ledger technologies, blockchain standard, DLT classification, consensus mechanisms, smart contracts, interoperability.