{
  "manageEntity": {
    "action": "Save",
    "entityId": "548968",
    "entityType": "Track",
    "nonce": "0x234da267bfa8c7a3dd5ae2c26888529eedf94d2a03872dc5746efa6ea4d4af7f",
    "signature": "0x29efcbae147a4ed8b1658688ed3cca2615918bdfdd7c97baab51f6376968f46e5a050c2e354708dca065c054d3b355d5e6377391464a872cb74868e3ee8d69b01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}