{
  "manageEntity": {
    "action": "Save",
    "entityId": "673799447",
    "entityType": "Track",
    "nonce": "0xa54bbe375acaeee8d12f5b60bfeb977213e508faed91e01d0991ebd1ca926a86",
    "signature": "0x9ec5b7cee076d1cef49dfc4b888a3b3a4d3fb4745d03039f3e17d9a9a2e194d453e92e3bfd078edfb9448da84175c2e69926a06265d1fb72449b3829820233331b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}