{
  "manageEntity": {
    "action": "Save",
    "entityId": "999621224",
    "entityType": "Track",
    "nonce": "0x7e2c9c7dc1c5a257b4aaa636a9dbd2ffb0a3e41cf886bbebd2ca40553c153a32",
    "signature": "0xc5b149d6025f1f429815990578dd52ae9e6fae8231b2a248bab8a341eeaf573f2812046c032fa395b9af535766a222a8b22781bfa59485a42dd5ed5696c69f3c1c",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}