diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 5a2e397a064..8b3577f949a 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -23,6 +23,7 @@ lightning-invoice = { path = "../lightning-invoice" }
 lightning-liquidity = { path = "../lightning-liquidity" }
 lightning-rapid-gossip-sync = { path = "../lightning-rapid-gossip-sync" }
 lightning-persister = { path = "../lightning-persister", features = ["tokio"]}
+lightning_0_2 = { package = "lightning", version = "0.2.0", features = ["_test_utils"] }
 bech32 = "0.11.0"
 bitcoin = { version = "0.32.4", features = ["secp-lowmemory"] }
 tokio = { version = "~1.35", default-features = false, features = ["rt-multi-thread"] }
diff --git a/fuzz/src/chanmon_consistency.rs b/fuzz/src/chanmon_consistency.rs
index 96104162db7..3572f4e8987 100644
--- a/fuzz/src/chanmon_consistency.rs
+++ b/fuzz/src/chanmon_consistency.rs
@@ -130,6 +130,28 @@ impl FeeEstimator for FuzzEstimator {
 	}
 }
 
+impl lightning_0_2::chain::chaininterface::FeeEstimator for FuzzEstimator {
+	fn get_est_sat_per_1000_weight(
+		&self, conf_target: lightning_0_2::chain::chaininterface::ConfirmationTarget,
+	) -> u32 {
+		match conf_target {
+            lightning_0_2::chain::chaininterface::ConfirmationTarget::MaximumFeeEstimate
+            | lightning_0_2::chain::chaininterface::ConfirmationTarget::UrgentOnChainSweep => {
+                MAX_FEE
+            },
+            lightning_0_2::chain::chaininterface::ConfirmationTarget::ChannelCloseMinimum
+            | lightning_0_2::chain::chaininterface::ConfirmationTarget::AnchorChannelFee
+            | lightning_0_2::chain::chaininterface::ConfirmationTarget::MinAllowedAnchorChannelRemoteFee
+            | lightning_0_2::chain::chaininterface::ConfirmationTarget::MinAllowedNonAnchorChannelRemoteFee
+            | lightning_0_2::chain::chaininterface::ConfirmationTarget::OutputSpendingFee => 253,
+            lightning_0_2::chain::chaininterface::ConfirmationTarget::NonAnchorChannelFee => {
+                let val = self.ret_val.load(atomic::Ordering::Relaxed);
+                cmp::min(val, MAX_FEE)
+            },
+        }
+	}
+}
+
 impl FuzzEstimator {
 	fn feerate_sat_per_kw(&self) -> FeeRate {
 		let feerate = self.ret_val.load(atomic::Ordering::Acquire);
@@ -182,6 +204,14 @@ impl BroadcasterInterface for TestBroadcaster {
 	}
 }
 
+impl lightning_0_2::chain::chaininterface::BroadcasterInterface for TestBroadcaster {
+	fn broadcast_transactions(&self, txs: &[&bitcoin::Transaction]) {
+		for tx in txs {
+			self.txn_broadcasted.borrow_mut().push((*tx).clone());
+		}
+	}
+}
+
 struct ChainState {
 	blocks: Vec<(Header, Vec<Transaction>)>,
 	confirmed_txids: HashSet<Txid>,
@@ -290,6 +320,20 @@ impl TestChainMonitor {
 			latest_monitors: Mutex::new(new_hash_map()),
 		}
 	}
+	fn do_watch_channel_bytes(
+		&self, channel_id_bytes: [u8; 32], monitor_id: u64, serialized_monitor: Vec<u8>,
+	) {
+		let channel_id = ChannelId(channel_id_bytes);
+		let state = LatestMonitorState {
+			persisted_monitor_id: monitor_id,
+			persisted_monitor: serialized_monitor,
+			pending_monitors: Vec::new(),
+		};
+		let mut latest_monitors = self.latest_monitors.lock().unwrap();
+		if latest_monitors.insert(channel_id, state).is_some() {
+			panic!("Already had monitor pre-watch_channel");
+		}
+	}
 }
 impl chain::Watch<TestChannelSigner> for TestChainMonitor {
 	fn watch_channel(
@@ -299,22 +343,8 @@ impl chain::Watch<TestChannelSigner> for TestChainMonitor {
 		monitor.write(&mut ser).unwrap();
 		let monitor_id = monitor.get_latest_update_id();
 		let res = self.chain_monitor.watch_channel(channel_id, monitor);
-		let state = match res {
-			Ok(chain::ChannelMonitorUpdateStatus::Completed) => LatestMonitorState {
-				persisted_monitor_id: monitor_id,
-				persisted_monitor: ser.0,
-				pending_monitors: Vec::new(),
-			},
-			Ok(chain::ChannelMonitorUpdateStatus::InProgress) => LatestMonitorState {
-				persisted_monitor_id: monitor_id,
-				persisted_monitor: Vec::new(),
-				pending_monitors: vec![(monitor_id, ser.0)],
-			},
-			Ok(chain::ChannelMonitorUpdateStatus::UnrecoverableError) => panic!(),
-			Err(()) => panic!(),
-		};
-		if self.latest_monitors.lock().unwrap().insert(channel_id, state).is_some() {
-			panic!("Already had monitor pre-watch_channel");
+		if res == Ok(chain::ChannelMonitorUpdateStatus::Completed) {
+			self.do_watch_channel_bytes(channel_id.0, monitor_id, ser.0);
 		}
 		res
 	}
@@ -368,6 +398,41 @@ impl chain::Watch<TestChannelSigner> for TestChainMonitor {
 	}
 }
 
+impl lightning_0_2::chain::Watch<lightning_0_2::util::test_channel_signer::TestChannelSigner>
+	for TestChainMonitor
+{
+	fn watch_channel(
+		&self, channel_id: lightning_0_2::ln::types::ChannelId,
+		monitor: lightning_0_2::chain::channelmonitor::ChannelMonitor<
+			lightning_0_2::util::test_channel_signer::TestChannelSigner,
+		>,
+	) -> Result<lightning_0_2::chain::ChannelMonitorUpdateStatus, ()> {
+		let mut ser = Vec::new();
+		lightning_0_2::util::ser::Writeable::write(&monitor, &mut ser).unwrap();
+		let monitor_id = monitor.get_latest_update_id();
+		self.do_watch_channel_bytes(channel_id.0, monitor_id, ser);
+
+		Ok(lightning_0_2::chain::ChannelMonitorUpdateStatus::Completed)
+	}
+	fn update_channel(
+		&self, _channel_id: lightning_0_2::ln::types::ChannelId,
+		_update: &lightning_0_2::chain::channelmonitor::ChannelMonitorUpdate,
+	) -> lightning_0_2::chain::ChannelMonitorUpdateStatus {
+		lightning_0_2::chain::ChannelMonitorUpdateStatus::Completed
+	}
+
+	fn release_pending_monitor_events(
+		&self,
+	) -> Vec<(
+		lightning_0_2::chain::transaction::OutPoint,
+		lightning_0_2::ln::types::ChannelId,
+		Vec<lightning_0_2::chain::channelmonitor::MonitorEvent>,
+		PublicKey,
+	)> {
+		Vec::new()
+	}
+}
+
 struct KeyProvider {
 	node_secret: SecretKey,
 	rand_bytes_id: atomic::AtomicU32,