added property base to pow_base

proofow.py

@@ -3,8 +3,11 @@ from itertools import count
 from hashlib import sha256
 
 
-
 class pow_base:
+    @property
+    def base(self):
+        return self._base
+
     def __init__(self, difficulty, base=None):
         self._base = urandom(self._bits//8) if not base else base
         self._target = 2 ** (self._bits - difficulty)
@@ -19,13 +22,11 @@ class pow_base:
         return int(hexresult, 16) < self._target
 
 
-
 class pow_hashlib_base(pow_base):
     def _hexdigest(self, data):
         return self._hasher(data).hexdigest()
 
 
-
 class pow256(pow_hashlib_base):
     _bits = 256
     _hasher = sha256