{
  "manageEntity": {
    "action": "Save",
    "entityId": "689123961",
    "entityType": "Track",
    "nonce": "0xbbb11dbf5b3da018f813b40d4be03f28ac51d37734217f28d77d1b6825a7d475",
    "signature": "0x699ff5e624502f9dba0a6ca9cb0536373eea5edc54b5e1917cb5d47916811a667d2db349cac15e7d385512ac9d159c5e6d44cf670ffb18c4c211801140db30751c",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}