{
  "manageEntity": {
    "action": "Save",
    "entityId": "1394365394",
    "entityType": "Track",
    "nonce": "0xa90a4d8cdb048f46712d262575cbb3076c1d39600c098eddadb722ed46fe3b8d",
    "signature": "0xed41e96bd6bdedd551b16087ea1222118db0d64689c7e486a8233b54fbc0ec1322e3ec33d24d89530fdbc875e4cf59e002d0ce8fcb060228d75ea4742e561dcd1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}