diff --git a/cashu/core/crypto/b_dhke.py b/cashu/core/crypto/b_dhke.py
index 80d72f29..f4dc179a 100644
--- a/cashu/core/crypto/b_dhke.py
+++ b/cashu/core/crypto/b_dhke.py
@@ -75,7 +75,7 @@ def verify(a: PrivateKey, C: PublicKey, secret_msg: str) -> bool:
 
 
 # stamps
-""" 
+"""
 Proves that a in A = a*G is the same as a in C_ = a*Y
 
 Bob: