{
  "manageEntity": {
    "action": "Save",
    "entityId": "712300",
    "entityType": "Track",
    "nonce": "0xd4f7fd3f16354657d8b17e22f569c5230c4af25f6b98c8528cda84e87db9c86d",
    "signature": "0x0f9b52bfcb31bf995436d3d23cfc67ea01db7b9f5bf46017b0eab899515fabbe24bab2664da8e9e272b23aa4efc75d0c95ac938307475a9fe5774097ad4b3c231c",
    "signer": "0x5A6DCd6E22135e4225594900c17114A7dAD01964",
    "userId": "580576096"
  }
}