{
  "manageEntity": {
    "action": "Save",
    "entityId": "1440724337",
    "entityType": "Track",
    "nonce": "0x74b8ccc32a48f8e4521d7b42cc94106bdefabe69edd9d452a02d542d75b4eabe",
    "signature": "0xe4559dd2d0cef001ead1a32201c78afe406b2b2f242df8364d74fa3aa3e009ee60be3c60cc685906a91ca7f5b61d18a2a7118e6990fd15e9b77b71e2af9896a21b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}