var evt = new BlockchainEvent(
EventId: "evt-001",
EventType: "IncidentDetected",
Payload: "{\"incidentId\":\"inc-001\",\"severity\":\"High\"}",
IpfsCid: "Qmabc123...",
Timestamp: DateTimeOffset.UtcNow
);
var result = await neoClient.RecordEventAsync(evt);