{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:orbiplex:schema:signal-marker-envelope:v1",
  "title": "SignalMarkerEnvelope v1",
  "description": "Machine-readable schema for the participant-scoped signed wire envelope that publishes a signal marker reference over an established peer session.",
  "type": "object",
  "additionalProperties": true,
  "x-dia-workflow": "project",
  "x-dia-status": "draft",
  "x-dia-basis": [
    "doc/project/40-proposals/014-node-transport-and-discovery-mvp.md",
    "doc/project/50-requirements/requirements-006.md",
    "doc/project/60-solutions/node.md"
  ],
  "required": [
    "schema/v",
    "message/id",
    "protocol/version",
    "message/kind",
    "sender/participant-id",
    "created-at",
    "marker/ref",
    "signature"
  ],
  "properties": {
    "schema/v": {
      "const": 1,
      "description": "Schema version."
    },
    "message/id": {
      "type": "string",
      "minLength": 1,
      "description": "Stable identifier of this signed application envelope."
    },
    "protocol/version": {
      "type": "string",
      "minLength": 1,
      "description": "Protocol version understood by the sender for this envelope family."
    },
    "message/kind": {
      "const": "signal-marker-envelope.v1",
      "description": "Canonical message family identifier for this participant-scoped wire envelope."
    },
    "sender/participant-id": {
      "type": "string",
      "minLength": 1,
      "pattern": "^participant:did:key:z[1-9A-HJ-NP-Za-km-z]+$",
      "description": "Participant identity that signs and emits this message."
    },
    "created-at": {
      "type": "string",
      "format": "date-time",
      "description": "Creation timestamp carried inside the signed envelope."
    },
    "marker/ref": {
      "type": "string",
      "minLength": 1,
      "description": "Stable reference to the signal-marker artifact or stream record pointed to by this envelope."
    },
    "signature": {
      "$ref": "#/$defs/signature"
    },
    "policy_annotations": {
      "type": "object",
      "additionalProperties": true,
      "description": "Optional local or federation-local annotations outside the minimal semantic core."
    }
  },
  "$defs": {
    "signature": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "alg",
        "value"
      ],
      "properties": {
        "alg": {
          "type": "string",
          "enum": [
            "ed25519"
          ]
        },
        "value": {
          "type": "string",
          "minLength": 1
        }
      }
    }
  }
}