{
  "manageEntity": {
    "action": "Create",
    "entityId": "1515575900",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"HEATER\",\"entity_id\":247882355,\"track_timestamp_s\":64}}",
    "nonce": "0xf6cf9d685f09ac2141371afc376d13010baa1c0c975e6ebb8bd94e7c5bb4056b",
    "signature": "0x2c45ccfd38c2cb8c7d81c78006bc12b41bd272e495114ab3de2840b38a0a6ffd4495bcd31b1004d50e6dbcdf7f62e3b023f57b7a55e6908205ee5cc0106bcfd01b",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}