{
  "manageEntity": {
    "action": "Save",
    "entityId": "505522645",
    "entityType": "Track",
    "nonce": "0x8021e25a1bb44b577940425d398a8dafc77207fffdc496634609ef50cf1b8e5d",
    "signature": "0xdeb474039868f8acf5c88875464c8f8c1150229ad45c12c819b28ea69a3f982e1637f4b6974c3cd995ade4fc3a810ba40be0ff364dc1ea1c092fe9598d9ec9c41c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}