diff --git a/client/src/client_sync/v17/hidden.rs b/client/src/client_sync/v17/hidden.rs
index d3b400fd..3bc2afea 100644
--- a/client/src/client_sync/v17/hidden.rs
+++ b/client/src/client_sync/v17/hidden.rs
@@ -56,3 +56,27 @@ macro_rules! impl_client_v17__wait_for_new_block {
         }
     };
 }
+
+/// Implements Bitcoin Core JSON-RPC API method `syncwithvalidationinterfacequeue`.
+#[macro_export]
+macro_rules! impl_client_v17__sync_with_validation_interface_queue {
+    () => {
+        impl Client {
+            pub fn sync_with_validation_interface_queue(&self) -> Result<()> {
+                self.call("syncwithvalidationinterfacequeue", &[])
+            }
+        }
+    };
+}
+
+/// Implements Bitcoin Core JSON-RPC API method `reconsiderblock`.
+#[macro_export]
+macro_rules! impl_client_v17__reconsider_block {
+    () => {
+        impl Client {
+            pub fn reconsider_block(&self, blockhash: bitcoin::BlockHash) -> Result<()> {
+                self.call("reconsiderblock", &[into_json(blockhash)?])
+            }
+        }
+    };
+}
diff --git a/client/src/client_sync/v17/mod.rs b/client/src/client_sync/v17/mod.rs
index 7ad22305..fd599518 100644
--- a/client/src/client_sync/v17/mod.rs
+++ b/client/src/client_sync/v17/mod.rs
@@ -70,6 +70,8 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v18/mod.rs b/client/src/client_sync/v18/mod.rs
index cb3d9e47..5a5a35f4 100644
--- a/client/src/client_sync/v18/mod.rs
+++ b/client/src/client_sync/v18/mod.rs
@@ -75,6 +75,8 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v19/mod.rs b/client/src/client_sync/v19/mod.rs
index dfc00400..0fc52e41 100644
--- a/client/src/client_sync/v19/mod.rs
+++ b/client/src/client_sync/v19/mod.rs
@@ -70,6 +70,8 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v20/hidden.rs b/client/src/client_sync/v20/hidden.rs
new file mode 100644
index 00000000..84702d76
--- /dev/null
+++ b/client/src/client_sync/v20/hidden.rs
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: CC0-1.0
+
+//! Macros for implementing JSON-RPC methods on a client.
+//!
+//! Specifically this is `== Hidden ==` methods that are not listed in the
+//! API docs of Bitcoin Core `v0.20`.
+//!
+//! All macros require `Client` to be in scope.
+//!
+//! See or use the `define_jsonrpc_bitreq_client!` macro to define a `Client`.
+
+/// Implements Bitcoin Core JSON-RPC API method `mockscheduler`.
+#[macro_export]
+macro_rules! impl_client_v20__mock_scheduler {
+    () => {
+        impl Client {
+            pub fn mock_scheduler(&self, delta_time: u64) -> Result<()> {
+                self.call("mockscheduler", &[into_json(delta_time)?])
+            }
+        }
+    };
+}
diff --git a/client/src/client_sync/v20/mod.rs b/client/src/client_sync/v20/mod.rs
index 40c2eed6..afa1ff2f 100644
--- a/client/src/client_sync/v20/mod.rs
+++ b/client/src/client_sync/v20/mod.rs
@@ -5,6 +5,7 @@
 //! We ignore option arguments unless they effect the shape of the returned JSON data.
 
 pub mod generating;
+pub mod hidden;
 
 use std::collections::BTreeMap;
 use std::path::Path;
@@ -70,6 +71,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v21/mod.rs b/client/src/client_sync/v21/mod.rs
index f532abdb..fcad23a7 100644
--- a/client/src/client_sync/v21/mod.rs
+++ b/client/src/client_sync/v21/mod.rs
@@ -76,6 +76,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v22/mod.rs b/client/src/client_sync/v22/mod.rs
index 1e0b542b..3353051b 100644
--- a/client/src/client_sync/v22/mod.rs
+++ b/client/src/client_sync/v22/mod.rs
@@ -76,6 +76,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v23/mod.rs b/client/src/client_sync/v23/mod.rs
index aba9cd2b..739bf59c 100644
--- a/client/src/client_sync/v23/mod.rs
+++ b/client/src/client_sync/v23/mod.rs
@@ -78,6 +78,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v24/mod.rs b/client/src/client_sync/v24/mod.rs
index 617dba69..36ef55a8 100644
--- a/client/src/client_sync/v24/mod.rs
+++ b/client/src/client_sync/v24/mod.rs
@@ -79,6 +79,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v25/mod.rs b/client/src/client_sync/v25/mod.rs
index b17d955d..b916340b 100644
--- a/client/src/client_sync/v25/mod.rs
+++ b/client/src/client_sync/v25/mod.rs
@@ -80,6 +80,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v26/mod.rs b/client/src/client_sync/v26/mod.rs
index b1f021a3..c201c8f3 100644
--- a/client/src/client_sync/v26/mod.rs
+++ b/client/src/client_sync/v26/mod.rs
@@ -86,6 +86,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v27/mod.rs b/client/src/client_sync/v27/mod.rs
index 385a122a..909987ac 100644
--- a/client/src/client_sync/v27/mod.rs
+++ b/client/src/client_sync/v27/mod.rs
@@ -82,6 +82,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v28/mod.rs b/client/src/client_sync/v28/mod.rs
index 422ad4e0..e41f05b0 100644
--- a/client/src/client_sync/v28/mod.rs
+++ b/client/src/client_sync/v28/mod.rs
@@ -83,6 +83,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v29/mod.rs b/client/src/client_sync/v29/mod.rs
index 851c2c2a..e39f57f9 100644
--- a/client/src/client_sync/v29/mod.rs
+++ b/client/src/client_sync/v29/mod.rs
@@ -87,6 +87,9 @@ crate::impl_client_v17__estimate_raw_fee!();
 crate::impl_client_v17__wait_for_block!();
 crate::impl_client_v17__wait_for_block_height!();
 crate::impl_client_v17__wait_for_new_block!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/client/src/client_sync/v30/mod.rs b/client/src/client_sync/v30/mod.rs
index 7acb8cbd..61d6e32b 100644
--- a/client/src/client_sync/v30/mod.rs
+++ b/client/src/client_sync/v30/mod.rs
@@ -83,6 +83,9 @@ crate::impl_client_v29__get_orphan_txs_verbosity_1!();
 crate::impl_client_v29__get_orphan_txs!();
 crate::impl_client_v27__add_connection!();
 crate::impl_client_v21__add_peer_address!();
+crate::impl_client_v17__sync_with_validation_interface_queue!();
+crate::impl_client_v17__reconsider_block!();
+crate::impl_client_v20__mock_scheduler!();
 
 // == Mining ==
 crate::impl_client_v17__get_block_template!();
diff --git a/integration_test/tests/hidden.rs b/integration_test/tests/hidden.rs
index 77ce3609..8aa3aa8b 100644
--- a/integration_test/tests/hidden.rs
+++ b/integration_test/tests/hidden.rs
@@ -173,3 +173,68 @@ fn hidden__get_orphan_txs__modelled() {
         }
     }
 }
+
+#[test]
+fn hidden__sync_with_validation_interface_queue() {
+    let node = Node::with_wallet(Wallet::Default, &[]);
+    node.fund_wallet();
+
+    // Create activity that causes validation callbacks.
+    let (_address, _txid) = node.create_mempool_transaction();
+
+    let _: () = node
+        .client
+        .sync_with_validation_interface_queue()
+        .expect("syncwithvalidationinterfacequeue");
+}
+
+#[test]
+fn hidden__reconsider_block() {
+    let node = Node::with_wallet(Wallet::Default, &[]);
+    node.fund_wallet();
+
+    node.mine_a_block();
+    node.mine_a_block();
+
+    let tip_before = node.client.best_block_hash().expect("bestblockhash");
+    let height_before = node.client.get_block_count().expect("getblockcount").0;
+
+    node.client.invalidate_block(tip_before).expect("invalidateblock");
+
+    let tip_after_invalidate =
+        node.client.best_block_hash().expect("bestblockhash after invalidate");
+    let height_after_invalidate = node.client.get_block_count().expect("getblockcount").0;
+
+    assert_ne!(
+        tip_after_invalidate, tip_before,
+        "tip should change after invalidating the tip block"
+    );
+    assert_eq!(
+        height_after_invalidate,
+        height_before - 1,
+        "height should decrease by 1 after invalidating the tip block"
+    );
+
+    node.client.reconsider_block(tip_before).expect("reconsiderblock");
+
+    let tip_after_reconsider =
+        node.client.best_block_hash().expect("bestblockhash after reconsider");
+    let height_after_reconsider = node.client.get_block_count().expect("getblockcount").0;
+
+    assert_eq!(
+        tip_after_reconsider, tip_before,
+        "tip should return to the previously invalidated block after reconsiderblock"
+    );
+    assert_eq!(
+        height_after_reconsider, height_before,
+        "height should return to the original height after reconsiderblock"
+    );
+}
+
+#[test]
+#[cfg(not(feature = "v19_and_below"))]
+fn hidden__mock_scheduler() {
+    let node = Node::with_wallet(Wallet::Default, &[]);
+
+    let _: () = node.client.mock_scheduler(1).expect("mockscheduler");
+}
diff --git a/types/src/v30/mining/mod.rs b/types/src/v30/mining/mod.rs
index 9e149471..a16ecc04 100644
--- a/types/src/v30/mining/mod.rs
+++ b/types/src/v30/mining/mod.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: CC0-1.0
 
-//! The JSON-RPC API for Bitcoin Core `v29` - mining.
+//! The JSON-RPC API for Bitcoin Core `v30` - mining.
 //!
 //! Types for methods found under the `== Mining ==` section of the API docs.