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