diff --git a/crates/tx-cache/src/types.rs b/crates/tx-cache/src/types.rs
index 8fb8ce27..4bbec03a 100644
--- a/crates/tx-cache/src/types.rs
+++ b/crates/tx-cache/src/types.rs
@@ -419,8 +419,9 @@ pub struct TxKey {
 
 /// The query object keys for the bundle GET endpoint.
 ///
-/// Cursor for the `block_number_index` GSI: paginates bundles for a given
-/// target block in score-descending order.
+/// Cursor for paginating bundles for the caller's permissioned target block
+/// in score-descending order. The target block is server-derived from the
+/// caller's slot permission and is not part of this cursor.
 #[derive(Debug, Copy, Clone, Serialize, Deserialize, PartialEq, Eq)]
 #[serde(rename_all = "camelCase")]
 pub struct BundleKey {
@@ -428,8 +429,6 @@ pub struct BundleKey {
     pub id: Uuid,
     /// The bundle score.
     pub score: u64,
-    /// The bundle's target block number.
-    pub target_block_number: u64,
 }
 
 /// The query object keys for the order GET endpoint.
@@ -589,9 +588,9 @@ mod tests {
 
         let cache_response = CacheResponse::paginated(
             BundleList { bundles: vec![dummy_bundle_with_id(uuid)] },
-            BundleKey { id: uuid, score: 100, target_block_number: 42 },
+            BundleKey { id: uuid, score: 100 },
         );
-        let expected_json = r#"{"bundles":[{"id":"5932d4bb-58d9-41a9-851d-8dd7f04ccc33","bundle":{"txs":[],"blockNumber":"0x0","replacementUuid":"5932d4bb-58d9-41a9-851d-8dd7f04ccc33"}}],"nextCursor":{"id":"5932d4bb-58d9-41a9-851d-8dd7f04ccc33","score":100,"targetBlockNumber":42}}"#;
+        let expected_json = r#"{"bundles":[{"id":"5932d4bb-58d9-41a9-851d-8dd7f04ccc33","bundle":{"txs":[],"blockNumber":"0x0","replacementUuid":"5932d4bb-58d9-41a9-851d-8dd7f04ccc33"}}],"nextCursor":{"id":"5932d4bb-58d9-41a9-851d-8dd7f04ccc33","score":100}}"#;
         let serialized = serde_json::to_string(&cache_response).unwrap();
         assert_eq!(serialized, expected_json);
         let deserialized =