{
  "manageEntity": {
    "action": "Save",
    "entityId": "578202511",
    "entityType": "Track",
    "nonce": "0x1668d054abc511e043da9838a81691792a253ebeed2cc93065be452d9c86fdfe",
    "signature": "0xced67a16ae34610677bc50d7c795ce1786dd7f0046a48df7cefe7585f54f5dcc77dea0eaef63ca31c2cd1d1455ea4cc3da8f0f467dbb311a8d3fa79577f5bd211c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}