Try to correct correctness of constant difficulty MLS

mining_in_logarithmic_space_constant_difficulty.py

@@ -4,6 +4,7 @@ import bitcoin
 import json
 from argparser import get_parser
 import config
+import copy
 
 # Bitcoin parameters
 κ = 256
@@ -35,11 +36,9 @@ def Compress(m, k, C, previous_score, previous_ℓ):
     return π + χ, new_score, ℓ
 
 def uparrow(C, μ):
-    chain = [block for block in C if block.level >= μ and block.level_min <= μ]
+    chain = copy.deepcopy([block for block in C if block.level >= μ and block.level_min <= μ])
     for blockIndex, block in enumerate(chain):
-        print('a', block.level_min, μ)
         block.level_min = μ
-        print('b', chain[blockIndex].level_min)
     return chain
 
 # Proceeding by dichotomy may not be worth it.