{
  "manageEntity": {
    "action": "Save",
    "entityId": "1038866871",
    "entityType": "Track",
    "nonce": "0x8bc21e35b474a9c104c453296d8992a8f2466453f3496a6c5dcbaa290e2286d7",
    "signature": "0x2f64e1f6d1d9fbfb788f324bcfc6164f1c8d2a8578574a03b916c81766387244307715bc28752dd4ea117f10c20e3807895710da9ce320e1042e2ee87ef0c8341c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}