{
  "manageEntity": {
    "action": "Save",
    "entityId": "904164429",
    "entityType": "Track",
    "nonce": "0xc2ac80dbe540afe009f8c9962d683f5d7890c41533ab7452e690d351351bc04a",
    "signature": "0x9cc0012b5e3035f10f2b734b3a064af9b886ad860f255c5c54b4d2444fa54d07688862b7f35a3f3182035ba8ad34c46ff3140ec6ae80c5b03be61d66540651381b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}