diff --git a/crates/core/component/dex/src/batch_swap_output_data.rs b/crates/core/component/dex/src/batch_swap_output_data.rs
index a5a13de900..f810136b38 100644
--- a/crates/core/component/dex/src/batch_swap_output_data.rs
+++ b/crates/core/component/dex/src/batch_swap_output_data.rs
@@ -134,6 +134,16 @@ impl ToConstraintField<Fq> for BatchSwapOutputData {
                 .to_field_elements()
                 .expect("Fq types are Bls12-377 field members"),
         );
+        public_inputs.extend(
+            Fq::from(self.sct_position_prefix.epoch())
+                .to_field_elements()
+                .expect("Fq types are Bls12-377 field members"),
+        );
+        public_inputs.extend(
+            Fq::from(self.sct_position_prefix.block())
+                .to_field_elements()
+                .expect("Fq types are Bls12-377 field members"),
+        );
         Some(public_inputs)
     }
 }
@@ -469,7 +479,7 @@ mod tests {
             height: 0u64,
             trading_pair,
             epoch_starting_height: 0u64,
-            sct_position_prefix: Position::default(),
+            sct_position_prefix: 0u64.into(),
         };
 
         // Now suppose our user's contribution is:
diff --git a/crates/core/component/dex/src/swap_claim/proof.rs b/crates/core/component/dex/src/swap_claim/proof.rs
index c562809d18..e90a863277 100644
--- a/crates/core/component/dex/src/swap_claim/proof.rs
+++ b/crates/core/component/dex/src/swap_claim/proof.rs
@@ -123,11 +123,16 @@ fn check_satisfaction(
         anyhow::bail!("claim fee did not match public input");
     }
 
-    let block: u64 = private.state_commitment_proof.position().block().into();
-    let note_commitment_block_height: u64 = public.output_data.epoch_starting_height + block;
-    if note_commitment_block_height != public.output_data.height {
-        anyhow::bail!("swap commitment height did not match public input");
-    }
+    anyhow::ensure!(
+        private.state_commitment_proof.position().block()
+            == public.output_data.sct_position_prefix.block(),
+        "scm block did not match batch swap"
+    );
+    anyhow::ensure!(
+        private.state_commitment_proof.position().epoch()
+            == public.output_data.sct_position_prefix.epoch(),
+        "scm epoch did not match batch swap"
+    );
 
     if private.swap_plaintext.trading_pair != public.output_data.trading_pair {
         anyhow::bail!("trading pair did not match public input");