private static bool HasInvalidTimestamp(TransactionViewModel transactionViewModel)
{
if (transactionViewModel.GetAttachmentTimestamp() == 0)
{
return(transactionViewModel.GetTimestamp() < MinTimestamp &&
transactionViewModel.GetHash() != Hash.NullHash ||
transactionViewModel.GetTimestamp() >
(TimeStamp.Now() / 1000) + MaxTimestampFuture);
}
return(transactionViewModel.GetAttachmentTimestamp() < MinTimestampMs ||
transactionViewModel.GetAttachmentTimestamp() > TimeStamp.Now() + MaxTimestampFutureMs);
}