{
  "manageEntity": {
    "action": "Save",
    "entityId": "2138781795",
    "entityType": "Track",
    "nonce": "0xf5afa271b92c66ddf1b394d1faa35711b67caab2bdf40149b4e5591c30db7242",
    "signature": "0x20c8ef123f48e8abebec97663fc4bbc20e016baa5e3569bad827e99e014364662814f57fc9c7e9a5c7281247386f7948bbc515e9587992ab489344ee53ebff0e1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}