{
  "manageEntity": {
    "action": "Save",
    "entityId": "349901",
    "entityType": "Track",
    "nonce": "0x277a8f71caaba74df565debd891886e56049958d568d838786dd137288a5ff15",
    "signature": "0xb3eb708feb456a0a4d333b8d6c1b91fca95fb7830595571a11f0a740a096463b4ce0cf54ad394ccf4d33f9c8c5eb1a560a2c600e6189907e0e6b944416be806b1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}