{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557014320",
    "entityType": "Track",
    "nonce": "0x6d2c75f748941313a86381bac026422955cd81db8b4f17a8ee12583bb55d6d17",
    "signature": "0x25a9df1fc8d76b0ccbd084a50e4fcb4275348df81174f4d4455802690dfa3ec475a555fe6295ac936d7a19400304d39eb43f572cf60579272cb9e4d05a5e00fa1b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}