{
  "manageEntity": {
    "action": "Save",
    "entityId": "1572531524",
    "entityType": "Track",
    "nonce": "0x77194f67a9d6c59e91debf66b7d9610b7dd6e19315cc8ae001190627da6c339b",
    "signature": "0xbb4561646a403ff2edc2b601008994f9694c736ac1a6d867148753d6d04f9166231a32f69b39c27265ae6da7a26ce791a63b5b92c9fc776e610d54cc6cec0f611b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}