{
  "manageEntity": {
    "action": "Save",
    "entityId": "449040297",
    "entityType": "Track",
    "nonce": "0xa1ba02c958147e4ed652e8432e759fe57e40ffb9de5949c165b860aca95e58e3",
    "signature": "0x148eb52e7a607ee3eb88069c9166039e4eb9a9090ba64a8a01080c316a1af3de27efbd8eff23bc9471dd2842056b10f46bad00bf48f341ef37f84c545be1b8b01c",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}