Delete historical artifact

This was just to explain Proof of History. We have better explanations
elsewhere. Delete!

Cargo.toml

@@ -12,10 +12,6 @@ authors = [
 ]
 license = "Apache-2.0"
 
-[[bin]]
-name = "solana-historian-demo"
-path = "src/bin/historian-demo.rs"
-
 [[bin]]
 name = "solana-client-demo"
 path = "src/bin/client-demo.rs"

src/bin/historian-demo.rs

@@ -1,38 +0,0 @@
-extern crate solana;
-
-use solana::entry::Entry;
-use solana::event::Event;
-use solana::hash::Hash;
-use solana::historian::Historian;
-use solana::ledger::Block;
-use solana::recorder::Signal;
-use solana::signature::{KeyPair, KeyPairUtil};
-use solana::transaction::Transaction;
-use std::sync::mpsc::{sync_channel, SendError, SyncSender};
-use std::thread::sleep;
-use std::time::Duration;
-
-fn create_ledger(input: &SyncSender<Signal>, seed: &Hash) -> Result<(), SendError<Signal>> {
-    sleep(Duration::from_millis(15));
-    let keypair = KeyPair::new();
-    let tr = Transaction::new(&keypair, keypair.pubkey(), 42, *seed);
-    let signal0 = Signal::Event(Event::Transaction(tr));
-    input.send(signal0)?;
-    sleep(Duration::from_millis(10));
-    Ok(())
-}
-
-fn main() {
-    let (input, event_receiver) = sync_channel(10);
-    let seed = Hash::default();
-    let hist = Historian::new(event_receiver, &seed, Some(10));
-    create_ledger(&input, &seed).expect("send error");
-    drop(input);
-    let entries: Vec<Entry> = hist.output.lock().unwrap().iter().collect();
-    for entry in &entries {
-        println!("{:?}", entry);
-    }
-    // Proof-of-History: Verify the historian learned about the events
-    // in the same order they appear in the vector.
-    assert!(entries[..].verify(&seed));
-}