{
  "manageEntity": {
    "action": "Save",
    "entityId": "1681223935",
    "entityType": "Track",
    "nonce": "0x00205aad73845b22e5af23168fbdffdcdd6574713e49174a10b75d1b954ed63e",
    "signature": "0x19dac94ce289b628739f151584792df5b32e2022a638d530210692b8b8e406003b9568ae5c8d8030dc83f8139e8023fb2b4ffda0c423ff379d42bbfb5a7109301c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}