{
  "manageEntity": {
    "action": "Save",
    "entityId": "1975138426",
    "entityType": "Track",
    "nonce": "0x40f05557a2c00eea54c9ead65d740ff59dcad20ed32c7e713fe19c3a1f7669d1",
    "signature": "0xcd608b281cfb89128592332a76ab90ccf2280126dad167bab884a14344b375075c19ac50579e6139f33a1576b6cfa8b775df0ebc78c0cd8df4b07ca31c4ba1fb1c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}