add block number #631130's hash of btc as beacon seed

src/bin/beacon.rs

@@ -33,8 +33,28 @@ fn main() {
         use rand::{SeedableRng};
         use rand::chacha::ChaChaRng;
 
-        // Place beacon value here (2^42 SHA256 hash of Bitcoin block hash #534861)
-        let beacon_value: [u8; 32] = hex!("2bf41a959668e5b9b688e58d613b3dcc99ee159a880cf764ec67e6488d8b8af3");
+        // Place block hash here (block number #631130)
+        let mut beacon_value: [u8; 32] = hex!("00000000000000000008de28ff08672c5b85add6d51024b90fa9424dadc82691");
+
+        // Performs 2^n hash iterations over it
+        const N: usize = 32;
+
+        for i in 0..(1u64<<N) {
+            // Print 1024 of the interstitial states
+            // so that verification can be
+            // parallelized
+            if i % (1u64<<(N-10)) == 0 {
+                print!("{}: ", i);
+                for b in cur_hash.iter() {
+                    print!("{:02x}", b);
+                }
+                println!("");
+            }
+
+            let mut h = Sha256::new();
+            h.input(&beacon_value);
+            h.result(&mut beacon_value);
+        }
 
         print!("Final result of beacon: ");
         for b in beacon_value.iter() {