{
  "manageEntity": {
    "action": "Save",
    "entityId": "594352068",
    "entityType": "Track",
    "nonce": "0xb878c796295ef599c7a261b8a31ccdbfe54d16edba55e61d82f616570bbd6dd5",
    "signature": "0xab12897c32b1cb447c6b2f0778d9a0de685d513cbcd9225ce31622fe61c2f33a5eae499c0b153b774ccb588091b3cdff4df13f93631bd276d2f79583489b49db1b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}