{
  "manageEntity": {
    "action": "Save",
    "entityId": "653239544",
    "entityType": "Track",
    "nonce": "0x76bbe4c404c43589e486b153f2734f85e17c37c612d0e04505f182c312996555",
    "signature": "0xd79d4f399a984bb19c92c997498b89c4e6f87be545dceb2e702d6039e79597bd477dcdda1ab5d033b79dd2ca4b30244c6e246a55c13732d5f17dc0911681e2631c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}