{
  "manageEntity": {
    "action": "Save",
    "entityId": "766993985",
    "entityType": "Track",
    "nonce": "0x5999b913161ec6ccf715a1be662017fa92f8b5f542b3f8697a735100b38e165d",
    "signature": "0x7afdaca88ad5f985f4df19b6a4ed978e3081e7fefc2c48b7aeaf69c7cb5bb993464f5b7ee6c6578cc679d96bb84f8245ddaa90fb40eb4940957e026ed0beac141b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}