{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://dynamicfeed.ai/schemas/awareness-v1.json",
  "title": "DF-VERIFY/1 — awareness/v1 profile",
  "description": "A signed go / caution / no-go awareness verdict for an acting system, grounded in live facts. The detached Ed25519 signature covers the whole object except its `signature` field, canonicalized json-sorted-compact (see https://dynamicfeed.ai/standard).",
  "type": "object",
  "required": ["schema", "issuer", "snapshot_id", "issued_at", "verdict", "degraded", "signature"],
  "additionalProperties": true,
  "properties": {
    "schema": { "const": "awareness/v1" },
    "issuer": { "type": "string", "description": "domain of the signing issuer, e.g. dynamicfeed.ai" },
    "snapshot_id": { "type": "string", "description": "unique id for this signed snapshot" },
    "issued_at": { "type": "string", "format": "date-time" },
    "robot": {
      "type": "object",
      "properties": {
        "id": { "type": ["string", "null"] },
        "class": { "enum": ["ground", "aerial", "marine", "orbital", "humanoid"] }
      },
      "additionalProperties": true
    },
    "location": {
      "type": "object",
      "properties": {
        "lat": { "type": "number", "minimum": -90, "maximum": 90 },
        "lon": { "type": "number", "minimum": -180, "maximum": 180 },
        "alt_m": { "type": ["number", "null"] }
      },
      "additionalProperties": true
    },
    "verdict": {
      "type": "object",
      "required": ["status"],
      "properties": {
        "status": { "enum": ["go", "caution", "no-go"] },
        "reasons": { "type": "array", "items": { "type": "string" } },
        "advisory": { "type": "string" }
      },
      "additionalProperties": true
    },
    "facts": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["id", "value", "source"],
        "properties": {
          "id": { "type": "string" },
          "domain": { "type": "string" },
          "value": { "type": ["number", "string", "boolean", "null"] },
          "unit": { "type": ["string", "null"] },
          "observed_at": { "type": ["string", "null"] },
          "age_s": { "type": ["number", "null"] },
          "source": { "type": "string" },
          "source_url": { "type": ["string", "null"] },
          "confidence": { "type": ["number", "null"] },
          "stale": { "type": "boolean" }
        },
        "additionalProperties": true
      }
    },
    "freshness": {
      "type": "object",
      "properties": {
        "min_age_s": { "type": ["number", "null"] },
        "max_age_s": { "type": ["number", "null"] },
        "stalest_field": { "type": ["string", "null"] }
      },
      "additionalProperties": true
    },
    "degraded": { "type": "boolean" },
    "degraded_sources": { "type": "array", "items": { "type": "string" } },
    "note": { "type": "string" },
    "signature": {
      "type": "object",
      "required": ["alg", "key_id", "canonicalization", "sig"],
      "properties": {
        "alg": { "const": "Ed25519" },
        "key_id": { "type": "string" },
        "canonicalization": { "const": "json-sorted-compact" },
        "sig": { "type": "string", "description": "base64url-encoded 64-byte Ed25519 signature" },
        "ephemeral_key": { "type": "boolean" }
      },
      "additionalProperties": true
    }
  },
  "if": {
    "properties": { "degraded": { "const": true } },
    "required": ["degraded"]
  },
  "then": {
    "description": "Safety floor: a degraded snapshot (missing/stale safety inputs) MUST NOT be `go`.",
    "properties": { "verdict": { "properties": { "status": { "enum": ["caution", "no-go"] } } } }
  }
}