{
  "manageEntity": {
    "action": "Save",
    "entityId": "639568501",
    "entityType": "Track",
    "nonce": "0x3ff39d40dead6a1ef4e0b4a6d0b37935a07bad867d07dca258fe57bef20284c3",
    "signature": "0xafcd2d5ce567069041f77fc9309fc93ed2915dfd57dc57160e413121534c11b14eaa2c7dbc23ee30be1fc963f513caf1a6fab1353737267fd86809acdfa1ff3f1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}