diff --git a/cryptarchia/cryptarchia.py b/cryptarchia/cryptarchia.py
index 98ca0df..c88f83d 100644
--- a/cryptarchia/cryptarchia.py
+++ b/cryptarchia/cryptarchia.py
@@ -477,7 +477,7 @@ class Follower:
     ) -> bool:
         threshold_0, threshold_1 = lottery_threshold(self.config.active_slot_coeff, epoch_state.total_active_stake())
         return (
-            proof.verify(slot, current_state.nonce, threshold_0, threshold_1, current_state.commitments_lead, parent)  # verify slot leader proof
+            proof.verify(slot, epoch_state.nonce() , threshold_0, threshold_1, current_state.commitments_lead, parent)  # verify slot leader proof
             # TODO: remove it because membership verification is included in the proof verification along with the PoS lottery:
             and (
                 current_state.verify_eligible_to_lead(proof.commitment)
diff --git a/cryptarchia/test_common.py b/cryptarchia/test_common.py
index 2c2586e..05c6894 100644
--- a/cryptarchia/test_common.py
+++ b/cryptarchia/test_common.py
@@ -27,7 +27,7 @@ class TestNode:
         parent = self.follower.tip_id()
         epoch_state = self.epoch_state(slot)
         # TODO: use the correct leader commitment set
-        if leader_proof := self.leader.try_prove_slot_leader(epoch_state.total_active_stake(), self.follower.tip_state().nonce, slot, {self.leader.coin.commitment()}, parent):
+        if leader_proof := self.leader.try_prove_slot_leader(epoch_state.total_active_stake(), epoch_state.nonce(), slot, {self.leader.coin.commitment()}, parent):
             orphans = self.follower.unimported_orphans(parent)
             self.leader.coin = self.leader.coin.evolve()
             return BlockHeader(