diff --git a/src/api.rs b/src/api.rs
index a8298be..85c3798 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -1474,11 +1474,13 @@ fn add_validation_token(mut process: Process, state_id: String, approval: bool)
         AnkHash::ValidationNo(AnkValidationNoHash::from_merkle_root(state_id))
     };
 
-    let local_device = lock_local_device()?;
-    let sp_wallet = local_device.get_wallet();
-    let proof = Proof::new(message_hash, sp_wallet.get_client().get_spend_key().try_into()?);
+    {
+        let local_device = lock_local_device()?;
+        let sp_wallet = local_device.get_wallet();
+        let proof = Proof::new(message_hash, sp_wallet.get_client().get_spend_key().try_into()?);
+        update_state.validation_tokens.push(proof);
+    }
 
-    update_state.validation_tokens.push(proof);
 
     let mut commit_msg = CommitMessage::new(
         process_id,