{
  "manageEntity": {
    "action": "Save",
    "entityId": "558973",
    "entityType": "Track",
    "nonce": "0xd60a88c09228d67486c8f3bcdef8271d42f533e666e0db71709c88068fcddde5",
    "signature": "0xbbe38600a76e7c316e019fd3e02f840c0e7cbce6e22da8dd062a117b91eb6ef418699b8a1a12d21c00c75f7ef642da34a1ed4238367fd653b9eb6218d82dcc011b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}