{
  "manageEntity": {
    "action": "Save",
    "entityId": "619185016",
    "entityType": "Track",
    "nonce": "0x5e6aef7af7382b15a797128ca91d2594099df407d20e432f24ed26def118410e",
    "signature": "0x12471a64318c4b73b9f162baae01dd37da4049b26b2c6540513e17856e6833894dc57c192f1e95a6d5360bcf61094fa923ae0818e13b033c9a0c1c47207ffde31b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}