{
  "manageEntity": {
    "action": "Create",
    "entityId": "742983689",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"\",\"entity_id\":889991178,\"track_timestamp_s\":137}}",
    "nonce": "0x079e9bf4a6e5e2d6c18470577f2df3f5b8f877d46dc8f86cac3dd460dc121f6e",
    "signature": "0xf4d1942557fc899fb6354c7c54aa79518ef48b52ee1efebde864a6c177600337539a4a3f4fe42d984958a4f4e8dc5626e7e6e2f80837e5eaef9e98d7f0cfd64c1c",
    "signer": "0xDfAC0702040EaBd2d42e773014D4b014C0747D9c",
    "userId": "707937"
  }
}