{
  "manageEntity": {
    "action": "Save",
    "entityId": "153558",
    "entityType": "Track",
    "nonce": "0x510aff6a523917a2b9bac2f8a43c9aabafd6251370a10539414afa8a17345e46",
    "signature": "0x118f01d9c995bac25693ceaa1933ba3edf0e657c8f71d2c55d40d51b60aabbba49c05ad13257cac50993a70a689dc0a1a7c326688c547d474b5878e83fe5f07d1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}