{
  "manageEntity": {
    "action": "Save",
    "entityId": "1503683375",
    "entityType": "Track",
    "nonce": "0x9d70ba90ed564000eb4be49e6a5b7c9e90a6c660434e60e713632c49b8e84e0a",
    "signature": "0x8d0abd8b658d95b942b04f305b6d000790bf1a62cec6cee1b9d12f25561bd3575c555a0603edff832a5d96b19e62415245adfd64230180ffcdf0d93b715ed87e1c",
    "signer": "0x8c3aa6cf594458763078BFd2ef8282051A8DBC16",
    "userId": "576672259"
  }
}