{
  "manageEntity": {
    "action": "Save",
    "entityId": "368373",
    "entityType": "Track",
    "nonce": "0xef89146b17c402574271dd98285d7e65dba74c20d5e453ca7fc0438d53a70bba",
    "signature": "0x976e3e93c58c5c67722edb9316603f52ec6f75ae441236239c56d773b7fcc65c6473cf79b99c7e80481b41cb667f3a918f469aa682459bb4a7e567d70bc030261b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}