{
  "manageEntity": {
    "action": "Save",
    "entityId": "90951",
    "entityType": "Track",
    "nonce": "0x3e507cbeb54c53492a08f1993a4973982181276571e58dd3646a8fe9a2101f03",
    "signature": "0x15e7e1e93722b4dd54333f41a018d6db06b60d5faff8166edbe43f747ac59972335c241e88e60983e5bc305b56b36036fc8ccb93e392204426c1dc57028f9d461c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}