{
  "manageEntity": {
    "action": "Save",
    "entityId": "428400",
    "entityType": "Track",
    "nonce": "0x7da899722ea1a9d125ef7206b321e098fbef71c80044d2ba4ddf0fde3f740723",
    "signature": "0xd79b0840290de846a6166dcafbd8429e1ca67ee1d9a420902a24548c3e1a338c284f290be371df8e0a1565b39d924510fef14c5fcd575183edf5b3d2a4e2909a1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}