{
  "manageEntity": {
    "action": "Save",
    "entityId": "1245716456",
    "entityType": "Track",
    "nonce": "0x9735f12304a6adaca19bfa3ea1bbf57cd8fdf3bd6f0952b31fbca11c356b8035",
    "signature": "0x385d21df8d68625697a3ab6e151d4ae9f0ffc35df144d0c757b8c04517270bd732645571973cc2431272e9d9531c4459605bfa2b9bf46521a2422da0d1d4e26e1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}