{
  "manageEntity": {
    "action": "Save",
    "entityId": "637926",
    "entityType": "Track",
    "nonce": "1789165187912374046",
    "signature": "0x791b731d2345444bfb48a410b7a4919cadc7adb0aaa39820ef3b9d49ea8ccf517e9d7941862dfdf3aaffd4872103b1bba247a1f6e0ef568e80ad64c5a8bf8a3b1b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}