diff --git a/classquiz/helpers/hashcash.py b/classquiz/helpers/hashcash.py
index 59ffc19..2056148 100644
--- a/classquiz/helpers/hashcash.py
+++ b/classquiz/helpers/hashcash.py
@@ -97,8 +97,8 @@ def _mint(challenge, bits):
     zeros = "0" * hex_digits
     while 1:
         digest = hashlib.sha1(
-            (challenge + hex(counter)[2:]).encode(), usedforsecurity=False
-        ).hexdigest()  # skipcq: PYL-E1123,  PTC-W1003
+            (challenge + hex(counter)[2:]).encode(), usedforsecurity=False  # skipcq: PYL-E1123,  PTC-W1003
+        ).hexdigest()
         if digest[:hex_digits] == zeros:
             tries[0] = counter
             return hex(counter)[2:]
@@ -140,8 +140,10 @@ def check(stamp, resource=None, bits=None, check_expiration=None, ds_callback=No
         else:
             hex_digits = int(floor(bits / 4))
             return (
-                hashlib.sha1((stamp).encode(), usedforsecurity=False).hexdigest().startswith("0" * hex_digits)
-            )  # skipcq: PYL-E1123,  PTC-W1003
+                hashlib.sha1((stamp).encode(), usedforsecurity=False)
+                .hexdigest()  # skipcq: PYL-E1123,  PTC-W1003
+                .startswith("0" * hex_digits)
+            )
     elif stamp.startswith("1:"):  # Version 1
         try:
             claim, date, res, _ext, _rand, _counter = stamp[2:].split(":")
@@ -160,7 +162,9 @@ def check(stamp, resource=None, bits=None, check_expiration=None, ds_callback=No
         else:
             hex_digits = int(floor(int(claim) / 4))
             return (
-                hashlib.sha1((stamp).encode(), usedforsecurity=False).hexdigest().startswith("0" * hex_digits)
+                hashlib.sha1((stamp).encode(), usedforsecurity=False)
+                .hexdigest()  # skipcq: PYL-E1123,  PTC-W1003
+                .startswith("0" * hex_digits)
             )  # skipcq: PYL-E1123,  PTC-W1003
     else:  # Unknown ver or generalized hashcash
         if type(bits) is not int:
@@ -170,5 +174,7 @@ def check(stamp, resource=None, bits=None, check_expiration=None, ds_callback=No
         else:
             hex_digits = int(floor(bits / 4))
             return (
-                hashlib.sha1((stamp).encode(), usedforsecurity=False).hexdigest().startswith("0" * hex_digits)
+                hashlib.sha1((stamp).encode(), usedforsecurity=False)
+                .hexdigest()  # skipcq: PYL-E1123,  PTC-W1003
+                .startswith("0" * hex_digits)
             )  # skipcq: PYL-E1123,  PTC-W1003