Added naive algo

diffadjust/blkdiff.py

@@ -22,6 +22,8 @@
 BOUNDED_ADJUST_FACTOR = 0.01
 # How many blocks back to look
 BLKS_BACK = 10
+# Naive difficulty adjustment factor
+NAIVE_ADJUST_FACTOR = 1/1024.
 
 
 # Produces a value according to the exponential distribution; used
@@ -82,6 +84,19 @@ def bounded_adjust(timestamps, diffs):
     return diffs[-1] * fac
 
 
+# Old Ethereum algorithm
+def old_adjust(timestamps, diffs):
+    if len(timestamps) < 2:
+        return diffs[-1]
+    delta = timestamps[-1] - timestamps[-2]
+    expected = TARGET * 0.693
+    if delta > expected:
+        fac = 1 - NAIVE_ADJUST_FACTOR
+    else:
+        fac = 1 + NAIVE_ADJUST_FACTOR
+    return diffs[-1] * fac
+
+
 def test(source, adjust):
     # Variables to keep track of for stats purposes
     ema = maxema = minema = TARGET