{
  "manageEntity": {
    "action": "Save",
    "entityId": "806440662",
    "entityType": "Track",
    "nonce": "0xc7887dbcffbbeb65f1d92aa23b94d469f4df1002981a314f37b7d843b3654de2",
    "signature": "0x51bc3b1a157df3024f01a575ca231b741e33a54fd1dd34d9249edf4e06896654659399a322bddfa292299d631492b28e5f506cef4620e89eaba7f86dede927dd1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}