{
  "manageEntity": {
    "action": "Save",
    "entityId": "437294886",
    "entityType": "Track",
    "nonce": "0x8a2268c7da0b306f7fe3078e80081d8dec98c88b46b1c5a5665a612d39468842",
    "signature": "0xdd37f40c07c398d0c5584b10524df93bd6d933bcd95d788145ef2d2cebb26130574d7a93bdbb67b77528d22363b2aafc3d756b594e581d88d4835618fcd3b3111b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}