{
  "manageEntity": {
    "action": "Save",
    "entityId": "521279305",
    "entityType": "Track",
    "nonce": "0xd78b2af02d4fc9c34565a3415589f00d524c4753bd90320aa01f04f84c4cb9da",
    "signature": "0x9e2a5f92b5492525ac06beb4c25d8e131f020886d0d7eb7b3529fc53f7ae961c2a394bcf9ebc4cbceaff08142aeba0ae27ff17ba6f4ebeda9856587a060ebe501b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}