{
  "manageEntity": {
    "action": "Save",
    "entityId": "263351",
    "entityType": "Track",
    "nonce": "0x2e8af87d1b752e695b4c3e745f4fba410d2e4ebe5a984b50cb6b1469a821e2ad",
    "signature": "0xbdb6f2c7ff65c1b1454d65c91c9bfb43b3df902198024c2f7cf78b88bcf5bb260a7ed1fd9a8d04eb935c9d8c84a5e158bd32cd1a4a72fe6ac8c8f785a7070d851c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}