{
  "manageEntity": {
    "action": "Save",
    "entityId": "667030397",
    "entityType": "Track",
    "nonce": "0x98b2613231e45dce1f010964c87a75856778c104669eaeb6f3112f3c8b8cf4ea",
    "signature": "0x3b3b237c7c8b3d33fe75a34f395275859e6eeedb3a90a882aea6f403e470783f69f8a073ccb8cf914f9952f88df2bba4130a073b8c89777b8ec08e218f65085b1c",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}