{
  "manageEntity": {
    "action": "Save",
    "entityId": "307716",
    "entityType": "Track",
    "nonce": "0xcfa0ea66211efa390920a59129bd175d7a7f10963f2bf60a4e6d41890520375b",
    "signature": "0xbbecd8af69e46cb063de59870a808a3dce4f4ba1db10862216f5fb6533bf3f4b1be4eec231e9ec5996f61643703d0211b5ac9b18afc73bf6421997c56043fcab1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}