{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:orbiplex:schema:room-membership-attestation:v1",
  "title": "RoomMembershipAttestation v1",
  "description": "Short-lived signed projection answer for room membership and grant checks.",
  "type": "object",
  "additionalProperties": false,
  "x-dia-workflow": "project",
  "x-dia-status": "draft",
  "x-dia-basis": ["P070"],
  "required": [
    "schema/v",
    "room/id",
    "subject",
    "member",
    "grants",
    "high-water/seq-no",
    "source/refs",
    "attested-at",
    "expires-at",
    "signer/ref",
    "signature"
  ],
  "properties": {
    "schema/v": { "const": 1 },
    "room/id": { "$ref": "room.v1.schema.json#/$defs/room_id" },
    "subject": { "$ref": "room.v1.schema.json#/$defs/subject" },
    "member": { "type": "boolean" },
    "grants": {
      "type": "array",
      "uniqueItems": true,
      "items": { "$ref": "room.v1.schema.json#/$defs/grant" }
    },
    "high-water/seq-no": { "type": "integer", "minimum": 0 },
    "source/refs": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 }
    },
    "attested-at": { "type": "string", "format": "date-time" },
    "expires-at": { "type": "string", "format": "date-time" },
    "signer/ref": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "pattern": "^(nym|participant|node|routing-subject|organization):did:key:z[1-9A-HJ-NP-Za-km-z]+$",
      "description": "Canonical Room-authority subject reference carrying one base58btc Ed25519 did:key. Runtime verification additionally checks the multicodec prefix and decoded key length."
    },
    "signature": {
      "type": "object",
      "additionalProperties": false,
      "required": ["alg", "value"],
      "properties": {
        "alg": { "const": "ed25519" },
        "value": { "type": "string", "minLength": 1, "maxLength": 256 }
      }
    },
    "extensions": { "$ref": "room.v1.schema.json#/$defs/extensions" }
  }
}