{
  "schema_version": "1.0",
  "last_updated": "2026-10-03",
  "canonical_url": "https://hardguard25.com/ontology.json",
  "project": {
    "id": "hardguard25",
    "name": "HardGuard25",
    "url": "https://hardguard25.com/",
    "repository": "https://github.com/snapsynapse/hardguard25",
    "type": "open_identifier_alphabet_standard"
  },
  "alphabet": {
    "canonical": "0123456789ACDFGHJKMNPRUWY",
    "radix": 25,
    "case": "uppercase_ascii",
    "canonical_pattern": "^[0-9ACDFGHJKMNPRUWY]+$"
  },
  "definitions": {
    "hardguard25_identifier": "A nonempty sequence whose canonical form contains only characters from the HardGuard25 alphabet.",
    "payload": "The identifier characters before an optional check digit.",
    "normalization": "Removal of the separators and exact Unicode White_Space set allowed by the specification, followed by uppercasing and alphabet validation.",
    "check_digit": "An optional final HardGuard25 character computed from the payload by the specification's weighted mod-25 algorithm.",
    "producer_conformance": "Generation of uppercase identifiers containing only HardGuard25 alphabet characters and following the claimed check-digit behavior.",
    "consumer_conformance": "Acceptance of conforming identifiers after specified normalization and rejection of invalid input.",
    "human_safe": "A design goal based on excluding common visual confusables, not a measured guarantee of error-free reading, typing, speech, or OCR."
  },
  "capabilities": [
    "alphabet",
    "normalization",
    "optional_check_digit",
    "formatting_guidance",
    "length_guidance",
    "cross_runtime_conformance_vectors"
  ],
  "non_capabilities": [
    "global_uniqueness_guarantee",
    "distributed_coordination",
    "time_ordering",
    "encryption",
    "signature_or_sealing",
    "hosted_agent_execution"
  ],
  "authoritative_sources": {
    "intent": "https://github.com/snapsynapse/hardguard25/blob/main/INTENT.md",
    "specification": "https://github.com/snapsynapse/hardguard25/blob/main/SPEC.md",
    "conformance": "https://github.com/snapsynapse/hardguard25/blob/main/CONFORMANCE.md",
    "agent_discovery": "https://hardguard25.com/agents.json",
    "relationships": "https://hardguard25.com/relationships.yaml"
  },
  "evidence_boundaries": [
    "Passing conformance tests does not establish global uniqueness for a consuming system.",
    "The alphabet's exclusions are documented design choices; comparative OCR and transcription error rates have not been established empirically.",
    "Repository source, published packages, and deployed website bytes are separate release states."
  ]
}