call method
Implementation
Stream<Nip01Event> call() {
return unverifiedStreamInput
.asyncMap<Nip01Event>((data) async {
final valid = await eventVerifier.verify(data);
data.validSig = valid; // assign validity
return data;
})
.where((event) => event.validSig == true) // Filter out invalid events
.asBroadcastStream();
}