{
  "manageEntity": {
    "action": "Save",
    "entityId": "203049872",
    "entityType": "Track",
    "nonce": "0xd3bbb4f45d3eab2fe918ee990a2962e2b83a708374aca01b09a5b8742e4f61aa",
    "signature": "0xa02e717c614b2322d17af567946c2b450140a8d51db0045c0a9f48121fcf030a6e81d4d757a1e81ca7f3bb520ea2d0f5476ac488daa1978a7d9836d7af18c2101b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}