{
  "protocol": "https://example.com/protocol.json",
  "published": true,
  "types": {
    "post": {},
    "reply": {}
  },
  "structure": {
    "post": {
      "$actions": [
        {
          "who": "anyone",
          "can": ["read", "write"]
        }
      ],
      "reply": {
        "$actions": [
          {
            "who": "anyone",
            "can": ["write"]
          },
          {
            "who": "recipient",
            "of": "post",
            "can": ["read"]
          }
        ]
      }
    }
  }
}