diff --git a/cashu/core/base.py b/cashu/core/base.py
index eafb85c6..d9f1dc0a 100644
--- a/cashu/core/base.py
+++ b/cashu/core/base.py
@@ -110,8 +110,7 @@ class Proof(BaseModel):
 
     def __init__(self, **data):
         super().__init__(**data)
-        if not self.Y:
-            self.Y = hash_to_curve(self.secret.encode("utf-8")).serialize().hex()
+        self.Y = hash_to_curve(self.secret.encode("utf-8")).serialize().hex()
 
     @classmethod
     def from_dict(cls, proof_dict: dict):