{
  "manageEntity": {
    "action": "Save",
    "entityId": "1684087941",
    "entityType": "Track",
    "nonce": "0xc8bf81acf20a69aac85fb928ee9fd92ff74bd86d6f339acd336da7a21ef8d759",
    "signature": "0xc75fa9990afade57758a2fd33512826e823c18edca80caa37e45ca62e485d8f53ab7038f63fc17883a8f5d0373d71048cfac637ab389403ecf1c9d817014892b1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}