{
  "manageEntity": {
    "action": "Save",
    "entityId": "389241812",
    "entityType": "Track",
    "nonce": "0x3e7c226e766ab7e10a4d7dc15e38d9a472f1abc4a3a987b3fd7d63eec77777e7",
    "signature": "0x048a96f03160cf34f94a5f46d3ff9649e9daaf327366581bbf27e8045cfdb3d2733c082717625da95b8faca10666c0b3142b1cca706c09d722b83ae61eb4c7dd1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}