{
  "manageEntity": {
    "action": "Save",
    "entityId": "656169",
    "entityType": "Track",
    "nonce": "0xf1b01dfca0f9408bd00b8002bf909c76df39ca7d669cb0efc81950ef48071965",
    "signature": "0xc830ccd816109d073e8221e251eb90e32830817ed0828b69f65cb41e95a4895279c287fb556b646064d668a237812631224cfef64fdfe44d4f09b94548d225d71b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}