{
  "manageEntity": {
    "action": "Save",
    "entityId": "193331",
    "entityType": "Track",
    "nonce": "0x8626effda44d52aeaa3bfad1e4fea7d1ba09d050212953f5f698528e21a01bbd",
    "signature": "0x2ab3c4fd7a67f3c0bd4a2fa9efd2ca9c92852678c1458382e98a7f8543f121f54f6ded5717e02953e539394097b16d7031b309002a1f40f9391cf43b62396e331c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}