{
  "manageEntity": {
    "action": "Save",
    "entityId": "428559594",
    "entityType": "Track",
    "nonce": "0xe22d49d67bbe5efd0b0f70d7b5284ca91bcd82be6367f527049db26fb1091771",
    "signature": "0x1bdf4691d96841f1cfebbec60d37b3d23797b6597206dcbc988211d81b57194d6db8ec6216c0865b19cc3980222e0c204aea5a2174239d47182ccac0482037ed1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}