Merge pull request #1967 from arik-so/2023-01-rename-signer-traits
[rust-lightning] / lightning / src / ln / channelmanager.rs
index 489f52cf2e16339879b123303b092d3ea67f5fc6..82640ad15f16c4a324a4880c04b33aa55525b926 100644 (file)
@@ -26,12 +26,10 @@ use bitcoin::network::constants::Network;
 
 use bitcoin::hashes::Hash;
 use bitcoin::hashes::sha256::Hash as Sha256;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::hash_types::{BlockHash, Txid};
 
 use bitcoin::secp256k1::{SecretKey,PublicKey};
 use bitcoin::secp256k1::Secp256k1;
-use bitcoin::secp256k1::ecdh::SharedSecret;
 use bitcoin::{LockTime, secp256k1, Sequence};
 
 use crate::chain;
@@ -57,7 +55,7 @@ use crate::ln::msgs::{ChannelMessageHandler, DecodeError, LightningError, MAX_VA
 use crate::ln::outbound_payment;
 use crate::ln::outbound_payment::{OutboundPayments, PendingOutboundPayment};
 use crate::ln::wire::Encode;
-use crate::chain::keysinterface::{EntropySource, KeysInterface, KeysManager, NodeSigner, Recipient, Sign, SignerProvider};
+use crate::chain::keysinterface::{EntropySource, KeysManager, NodeSigner, Recipient, SignerProvider, ChannelSigner};
 use crate::util::config::{UserConfig, ChannelConfig};
 use crate::util::events::{Event, EventHandler, EventsProvider, MessageSendEvent, MessageSendEventsProvider, ClosureReason, HTLCDestination};
 use crate::util::events;
@@ -454,7 +452,7 @@ pub(crate) enum MonitorUpdateCompletionAction {
 }
 
 /// State we hold per-peer.
-pub(super) struct PeerState<Signer: Sign> {
+pub(super) struct PeerState<Signer: ChannelSigner> {
        /// `temporary_channel_id` or `channel_id` -> `channel`.
        ///
        /// Holds all channels where the peer is the counterparty. Once a channel has been assigned a
@@ -502,6 +500,8 @@ pub type SimpleArcChannelManager<M, T, F, L> = ChannelManager<
        Arc<M>,
        Arc<T>,
        Arc<KeysManager>,
+       Arc<KeysManager>,
+       Arc<KeysManager>,
        Arc<F>,
        Arc<DefaultRouter<
                Arc<NetworkGraph<Arc<L>>>,
@@ -521,7 +521,7 @@ pub type SimpleArcChannelManager<M, T, F, L> = ChannelManager<
 /// type alias chooses the concrete types of KeysManager and DefaultRouter.
 ///
 /// (C-not exported) as Arcs don't make sense in bindings
-pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, M, T, F, L> = ChannelManager<&'a M, &'b T, &'c KeysManager, &'d F, &'e DefaultRouter<&'f NetworkGraph<&'g L>, &'g L, &'h Mutex<ProbabilisticScorer<&'f NetworkGraph<&'g L>, &'g L>>>, &'g L>;
+pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, M, T, F, L> = ChannelManager<&'a M, &'b T, &'c KeysManager, &'c KeysManager, &'c KeysManager, &'d F, &'e DefaultRouter<&'f NetworkGraph<&'g L>, &'g L, &'h Mutex<ProbabilisticScorer<&'f NetworkGraph<&'g L>, &'g L>>>, &'g L>;
 
 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
@@ -575,13 +575,13 @@ pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, M, T, F, L> = C
 //  |   |
 //  |   |__`pending_intercepted_htlcs`
 //  |
-//  |__`pending_inbound_payments`
+//  |__`per_peer_state`
 //  |   |
-//  |   |__`claimable_payments`
-//  |   |
-//  |   |__`pending_outbound_payments` // This field's struct contains a map of pending outbounds
+//  |   |__`pending_inbound_payments`
+//  |       |
+//  |       |__`claimable_payments`
 //  |       |
-//  |       |__`per_peer_state`
+//  |       |__`pending_outbound_payments` // This field's struct contains a map of pending outbounds
 //  |           |
 //  |           |__`peer_state`
 //  |               |
@@ -597,11 +597,13 @@ pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, M, T, F, L> = C
 //  |                   |
 //  |                   |__`pending_background_events`
 //
-pub struct ChannelManager<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+pub struct ChannelManager<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -717,7 +719,6 @@ where
        #[cfg(not(test))]
        short_to_chan_info: FairRwLock<HashMap<u64, (PublicKey, [u8; 32])>>,
 
-       our_network_key: SecretKey,
        our_network_pubkey: PublicKey,
 
        inbound_payment_key: inbound_payment::ExpandedKey,
@@ -754,9 +755,9 @@ where
        ///
        /// See `ChannelManager` struct-level documentation for lock order requirements.
        #[cfg(not(any(test, feature = "_test_utils")))]
-       per_peer_state: FairRwLock<HashMap<PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>>>,
+       per_peer_state: FairRwLock<HashMap<PublicKey, Mutex<PeerState<<SP::Target as SignerProvider>::Signer>>>>,
        #[cfg(any(test, feature = "_test_utils"))]
-       pub(super) per_peer_state: FairRwLock<HashMap<PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>>>,
+       pub(super) per_peer_state: FairRwLock<HashMap<PublicKey, Mutex<PeerState<<SP::Target as SignerProvider>::Signer>>>>,
 
        /// See `ChannelManager` struct-level documentation for lock order requirements.
        pending_events: Mutex<Vec<events::Event>>,
@@ -772,7 +773,9 @@ where
 
        persistence_notifier: Notifier,
 
-       keys_manager: K,
+       entropy_source: ES,
+       node_signer: NS,
+       signer_provider: SP,
 
        logger: L,
 }
@@ -1147,12 +1150,12 @@ macro_rules! handle_error {
                match $internal {
                        Ok(msg) => Ok(msg),
                        Err(MsgHandleErrInternal { err, chan_id, shutdown_finish }) => {
-                               #[cfg(debug_assertions)]
+                               #[cfg(any(feature = "_test_utils", test))]
                                {
                                        // In testing, ensure there are no deadlocks where the lock is already held upon
                                        // entering the macro.
-                                       assert!($self.pending_events.try_lock().is_ok());
-                                       assert!($self.per_peer_state.try_write().is_ok());
+                                       debug_assert!($self.pending_events.try_lock().is_ok());
+                                       debug_assert!($self.per_peer_state.try_write().is_ok());
                                }
 
                                let mut msg_events = Vec::with_capacity(2);
@@ -1187,7 +1190,7 @@ macro_rules! handle_error {
                                                let mut peer_state = peer_state_mutex.lock().unwrap();
                                                peer_state.pending_msg_events.append(&mut msg_events);
                                        }
-                                       #[cfg(debug_assertions)]
+                                       #[cfg(any(feature = "_test_utils", test))]
                                        {
                                                if let None = per_peer_state.get(&$counterparty_node_id) {
                                                        // This shouldn't occour in tests unless an unkown counterparty_node_id
@@ -1200,10 +1203,10 @@ macro_rules! handle_error {
                                                                => {
                                                                        assert_eq!(*data, expected_error_str);
                                                                        if let Some((err_channel_id, _user_channel_id)) = chan_id {
-                                                                               assert_eq!(*channel_id, err_channel_id);
+                                                                               debug_assert_eq!(*channel_id, err_channel_id);
                                                                        }
                                                                }
-                                                               _ => panic!("Unexpected event"),
+                                                               _ => debug_assert!(false, "Unexpected event"),
                                                        }
                                                }
                                        }
@@ -1406,11 +1409,13 @@ macro_rules! emit_channel_ready_event {
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -1425,10 +1430,10 @@ where
        /// Users need to notify the new ChannelManager when a new block is connected or
        /// disconnected using its `block_connected` and `block_disconnected` methods, starting
        /// from after `params.latest_hash`.
-       pub fn new(fee_est: F, chain_monitor: M, tx_broadcaster: T, router: R, logger: L, keys_manager: K, config: UserConfig, params: ChainParameters) -> Self {
+       pub fn new(fee_est: F, chain_monitor: M, tx_broadcaster: T, router: R, logger: L, entropy_source: ES, node_signer: NS, signer_provider: SP, config: UserConfig, params: ChainParameters) -> Self {
                let mut secp_ctx = Secp256k1::new();
-               secp_ctx.seeded_randomize(&keys_manager.get_secure_random_bytes());
-               let inbound_pmt_key_material = keys_manager.get_inbound_payment_key_material();
+               secp_ctx.seeded_randomize(&entropy_source.get_secure_random_bytes());
+               let inbound_pmt_key_material = node_signer.get_inbound_payment_key_material();
                let expanded_inbound_key = inbound_payment::ExpandedKey::new(&inbound_pmt_key_material);
                ChannelManager {
                        default_configuration: config.clone(),
@@ -1449,14 +1454,13 @@ where
                        id_to_peer: Mutex::new(HashMap::new()),
                        short_to_chan_info: FairRwLock::new(HashMap::new()),
 
-                       our_network_key: keys_manager.get_node_secret(Recipient::Node).unwrap(),
-                       our_network_pubkey: PublicKey::from_secret_key(&secp_ctx, &keys_manager.get_node_secret(Recipient::Node).unwrap()),
+                       our_network_pubkey: node_signer.get_node_id(Recipient::Node).unwrap(),
                        secp_ctx,
 
                        inbound_payment_key: expanded_inbound_key,
-                       fake_scid_rand_bytes: keys_manager.get_secure_random_bytes(),
+                       fake_scid_rand_bytes: entropy_source.get_secure_random_bytes(),
 
-                       probing_cookie_secret: keys_manager.get_secure_random_bytes(),
+                       probing_cookie_secret: entropy_source.get_secure_random_bytes(),
 
                        highest_seen_timestamp: AtomicUsize::new(0),
 
@@ -1467,7 +1471,9 @@ where
                        total_consistency_lock: RwLock::new(()),
                        persistence_notifier: Notifier::new(),
 
-                       keys_manager,
+                       entropy_source,
+                       node_signer,
+                       signer_provider,
 
                        logger,
                }
@@ -1486,7 +1492,7 @@ where
                        if cfg!(fuzzing) { // fuzzing chacha20 doesn't use the key at all so we always get the same alias
                                outbound_scid_alias += 1;
                        } else {
-                               outbound_scid_alias = fake_scid::Namespace::OutboundAlias.get_fake_scid(height, &self.genesis_hash, &self.fake_scid_rand_bytes, &self.keys_manager);
+                               outbound_scid_alias = fake_scid::Namespace::OutboundAlias.get_fake_scid(height, &self.genesis_hash, &self.fake_scid_rand_bytes, &self.entropy_source);
                        }
                        if outbound_scid_alias != 0 && self.outbound_scid_aliases.lock().unwrap().insert(outbound_scid_alias) {
                                break;
@@ -1543,7 +1549,7 @@ where
                        let outbound_scid_alias = self.create_and_insert_outbound_scid_alias();
                        let their_features = &peer_state.latest_features;
                        let config = if override_config.is_some() { override_config.as_ref().unwrap() } else { &self.default_configuration };
-                       match Channel::new_outbound(&self.fee_estimator, &self.keys_manager, their_network_key,
+                       match Channel::new_outbound(&self.fee_estimator, &self.entropy_source, &self.signer_provider, their_network_key,
                                their_features, channel_value_satoshis, push_msat, user_channel_id, config,
                                self.best_block.read().unwrap().height(), outbound_scid_alias)
                        {
@@ -1575,7 +1581,7 @@ where
                Ok(temporary_channel_id)
        }
 
-       fn list_channels_with_filter<Fn: FnMut(&(&[u8; 32], &Channel<<K::Target as SignerProvider>::Signer>)) -> bool + Copy>(&self, f: Fn) -> Vec<ChannelDetails> {
+       fn list_channels_with_filter<Fn: FnMut(&(&[u8; 32], &Channel<<SP::Target as SignerProvider>::Signer>)) -> bool + Copy>(&self, f: Fn) -> Vec<ChannelDetails> {
                let mut res = Vec::new();
                // Allocate our best estimate of the number of channels we have in the `res`
                // Vec. Sadly the `short_to_chan_info` map doesn't cover channels without
@@ -1663,7 +1669,7 @@ where
        }
 
        /// Helper function that issues the channel close events
-       fn issue_channel_close_events(&self, channel: &Channel<<K::Target as SignerProvider>::Signer>, closure_reason: ClosureReason) {
+       fn issue_channel_close_events(&self, channel: &Channel<<SP::Target as SignerProvider>::Signer>, closure_reason: ClosureReason) {
                let mut pending_events_lock = self.pending_events.lock().unwrap();
                match channel.unbroadcasted_funding() {
                        Some(transaction) => {
@@ -1694,12 +1700,12 @@ where
                        let peer_state = &mut *peer_state_lock;
                        match peer_state.channel_by_id.entry(channel_id.clone()) {
                                hash_map::Entry::Occupied(mut chan_entry) => {
-                                       let (shutdown_msg, monitor_update, htlcs) = chan_entry.get_mut().get_shutdown(&self.keys_manager, &peer_state.latest_features, target_feerate_sats_per_1000_weight)?;
+                                       let (shutdown_msg, monitor_update, htlcs) = chan_entry.get_mut().get_shutdown(&self.signer_provider, &peer_state.latest_features, target_feerate_sats_per_1000_weight)?;
                                        failed_htlcs = htlcs;
 
                                        // Update the monitor with the shutdown script if necessary.
                                        if let Some(monitor_update) = monitor_update {
-                                               let update_res = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), monitor_update);
+                                               let update_res = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), &monitor_update);
                                                let (result, is_permanent) =
                                                        handle_monitor_update_res!(self, update_res, chan_entry.get_mut(), RAACommitmentOrder::CommitmentFirst, chan_entry.key(), NO_UPDATE);
                                                if is_permanent {
@@ -1797,7 +1803,7 @@ where
                        // force-closing. The monitor update on the required in-memory copy should broadcast
                        // the latest local state, which is the best we can do anyway. Thus, it is safe to
                        // ignore the result here.
-                       let _ = self.chain_monitor.update_channel(funding_txo, monitor_update);
+                       let _ = self.chain_monitor.update_channel(funding_txo, &monitor_update);
                }
        }
 
@@ -2007,7 +2013,9 @@ where
                        return_malformed_err!("invalid ephemeral pubkey", 0x8000 | 0x4000 | 6);
                }
 
-               let shared_secret = SharedSecret::new(&msg.onion_routing_packet.public_key.unwrap(), &self.our_network_key).secret_bytes();
+               let shared_secret = self.node_signer.ecdh(
+                       Recipient::Node, &msg.onion_routing_packet.public_key.unwrap(), None
+               ).unwrap().secret_bytes();
 
                if msg.onion_routing_packet.version != 0 {
                        //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
@@ -2092,7 +2100,7 @@ where
                        // short_channel_id is non-0 in any ::Forward.
                        if let &PendingHTLCRouting::Forward { ref short_channel_id, .. } = routing {
                                if let Some((err, mut code, chan_update)) = loop {
-                                       let id_option = self.short_to_chan_info.read().unwrap().get(&short_channel_id).cloned();
+                                       let id_option = self.short_to_chan_info.read().unwrap().get(short_channel_id).cloned();
                                        let forwarding_chan_info_opt = match id_option {
                                                None => { // unknown_next_peer
                                                        // Note that this is likely a timing oracle for detecting whether an scid is a
@@ -2226,7 +2234,7 @@ where
        /// [`MessageSendEvent::BroadcastChannelUpdate`] event.
        ///
        /// May be called with peer_state already locked!
-       fn get_channel_update_for_broadcast(&self, chan: &Channel<<K::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
+       fn get_channel_update_for_broadcast(&self, chan: &Channel<<SP::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
                if !chan.should_announce() {
                        return Err(LightningError {
                                err: "Cannot broadcast a channel_update for a private channel".to_owned(),
@@ -2245,7 +2253,7 @@ where
        /// and thus MUST NOT be called unless the recipient of the resulting message has already
        /// provided evidence that they know about the existence of the channel.
        /// May be called with peer_state already locked!
-       fn get_channel_update_for_unicast(&self, chan: &Channel<<K::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
+       fn get_channel_update_for_unicast(&self, chan: &Channel<<SP::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
                log_trace!(self.logger, "Attempting to generate channel update for channel {}", log_bytes!(chan.channel_id()));
                let short_channel_id = match chan.get_short_channel_id().or(chan.latest_inbound_scid_alias()) {
                        None => return Err(LightningError{err: "Channel not yet established".to_owned(), action: msgs::ErrorAction::IgnoreError}),
@@ -2254,9 +2262,9 @@ where
 
                self.get_channel_update_for_onion(short_channel_id, chan)
        }
-       fn get_channel_update_for_onion(&self, short_channel_id: u64, chan: &Channel<<K::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
+       fn get_channel_update_for_onion(&self, short_channel_id: u64, chan: &Channel<<SP::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
                log_trace!(self.logger, "Generating channel update for channel {}", log_bytes!(chan.channel_id()));
-               let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).serialize()[..] < chan.get_counterparty_node_id().serialize()[..];
+               let were_node_one = self.our_network_pubkey.serialize()[..] < chan.get_counterparty_node_id().serialize()[..];
 
                let unsigned = msgs::UnsignedChannelUpdate {
                        chain_hash: self.genesis_hash,
@@ -2270,9 +2278,11 @@ where
                        fee_proportional_millionths: chan.get_fee_proportional_millionths(),
                        excess_data: Vec::new(),
                };
-
-               let msg_hash = Sha256dHash::hash(&unsigned.encode()[..]);
-               let sig = self.secp_ctx.sign_ecdsa(&hash_to_message!(&msg_hash[..]), &self.our_network_key);
+               // Panic on failure to signal LDK should be restarted to retry signing the `ChannelUpdate`.
+               // If we returned an error and the `node_signer` cannot provide a signature for whatever
+               // reason`, we wouldn't be able to receive inbound payments through the corresponding
+               // channel.
+               let sig = self.node_signer.sign_gossip_message(msgs::UnsignedGossipMessage::ChannelUpdate(&unsigned)).unwrap();
 
                Ok(msgs::ChannelUpdate {
                        signature: sig,
@@ -2283,7 +2293,7 @@ where
        // Only public for testing, this should otherwise never be called direcly
        pub(crate) fn send_payment_along_path(&self, path: &Vec<RouteHop>, payment_params: &Option<PaymentParameters>, payment_hash: &PaymentHash, payment_secret: &Option<PaymentSecret>, total_value: u64, cur_height: u32, payment_id: PaymentId, keysend_preimage: &Option<PaymentPreimage>, session_priv_bytes: [u8; 32]) -> Result<(), APIError> {
                log_trace!(self.logger, "Attempting to send payment for path with next hop {}", path.first().unwrap().short_channel_id);
-               let prng_seed = self.keys_manager.get_secure_random_bytes();
+               let prng_seed = self.entropy_source.get_secure_random_bytes();
                let session_priv = SecretKey::from_slice(&session_priv_bytes[..]).expect("RNG is busted");
 
                let onion_keys = onion_utils::construct_onion_keys(&self.secp_ctx, &path, &session_priv)
@@ -2326,7 +2336,7 @@ where
                                                chan)
                                } {
                                        Some((update_add, commitment_signed, monitor_update)) => {
-                                               let update_err = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update);
+                                               let update_err = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), &monitor_update);
                                                let chan_id = chan.get().channel_id();
                                                match (update_err,
                                                        handle_monitor_update_res!(self, update_err, chan,
@@ -2431,7 +2441,7 @@ where
        pub fn send_payment(&self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>, payment_id: PaymentId) -> Result<(), PaymentSendFailure> {
                let best_block_height = self.best_block.read().unwrap().height();
                self.pending_outbound_payments
-                       .send_payment_with_route(route, payment_hash, payment_secret, payment_id, &self.keys_manager, best_block_height,
+                       .send_payment_with_route(route, payment_hash, payment_secret, payment_id, &self.entropy_source, &self.node_signer, best_block_height,
                                |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
                                self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
        }
@@ -2439,7 +2449,7 @@ where
        #[cfg(test)]
        fn test_send_payment_internal(&self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>, keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>, onion_session_privs: Vec<[u8; 32]>) -> Result<(), PaymentSendFailure> {
                let best_block_height = self.best_block.read().unwrap().height();
-               self.pending_outbound_payments.test_send_payment_internal(route, payment_hash, payment_secret, keysend_preimage, payment_id, recv_value_msat, onion_session_privs, &self.keys_manager, best_block_height,
+               self.pending_outbound_payments.test_send_payment_internal(route, payment_hash, payment_secret, keysend_preimage, payment_id, recv_value_msat, onion_session_privs, &self.node_signer, best_block_height,
                        |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
                        self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
        }
@@ -2447,7 +2457,7 @@ where
        #[cfg(test)]
        pub(crate) fn test_add_new_pending_payment(&self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId, route: &Route) -> Result<Vec<[u8; 32]>, PaymentSendFailure> {
                let best_block_height = self.best_block.read().unwrap().height();
-               self.pending_outbound_payments.test_add_new_pending_payment(payment_hash, payment_secret, payment_id, route, &self.keys_manager, best_block_height)
+               self.pending_outbound_payments.test_add_new_pending_payment(payment_hash, payment_secret, payment_id, route, &self.entropy_source, best_block_height)
        }
 
 
@@ -2463,7 +2473,7 @@ where
        /// [`abandon_payment`]: [`ChannelManager::abandon_payment`]
        pub fn retry_payment(&self, route: &Route, payment_id: PaymentId) -> Result<(), PaymentSendFailure> {
                let best_block_height = self.best_block.read().unwrap().height();
-               self.pending_outbound_payments.retry_payment_with_route(route, payment_id, &self.keys_manager, best_block_height,
+               self.pending_outbound_payments.retry_payment_with_route(route, payment_id, &self.entropy_source, &self.node_signer, best_block_height,
                        |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
                        self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
        }
@@ -2512,7 +2522,7 @@ where
        /// [`send_payment`]: Self::send_payment
        pub fn send_spontaneous_payment(&self, route: &Route, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId) -> Result<PaymentHash, PaymentSendFailure> {
                let best_block_height = self.best_block.read().unwrap().height();
-               self.pending_outbound_payments.send_spontaneous_payment(route, payment_preimage, payment_id, &self.keys_manager, best_block_height,
+               self.pending_outbound_payments.send_spontaneous_payment(route, payment_preimage, payment_id, &self.entropy_source, &self.node_signer, best_block_height,
                        |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
                        self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
        }
@@ -2522,7 +2532,7 @@ where
        /// us to easily discern them from real payments.
        pub fn send_probe(&self, hops: Vec<RouteHop>) -> Result<(PaymentHash, PaymentId), PaymentSendFailure> {
                let best_block_height = self.best_block.read().unwrap().height();
-               self.pending_outbound_payments.send_probe(hops, self.probing_cookie_secret, &self.keys_manager, best_block_height,
+               self.pending_outbound_payments.send_probe(hops, self.probing_cookie_secret, &self.entropy_source, &self.node_signer, best_block_height,
                        |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
                        self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
        }
@@ -2536,13 +2546,13 @@ where
 
        /// Handles the generation of a funding transaction, optionally (for tests) with a function
        /// which checks the correctness of the funding transaction given the associated channel.
-       fn funding_transaction_generated_intern<FundingOutput: Fn(&Channel<<K::Target as SignerProvider>::Signer>, &Transaction) -> Result<OutPoint, APIError>>(
+       fn funding_transaction_generated_intern<FundingOutput: Fn(&Channel<<SP::Target as SignerProvider>::Signer>, &Transaction) -> Result<OutPoint, APIError>>(
                &self, temporary_channel_id: &[u8; 32], counterparty_node_id: &PublicKey, funding_transaction: Transaction, find_funding_output: FundingOutput
        ) -> Result<(), APIError> {
                let per_peer_state = self.per_peer_state.read().unwrap();
                let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
                if let None = peer_state_mutex_opt {
-                       return Err(APIError::APIMisuseError { err: format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id) })
+                       return Err(APIError::ChannelUnavailable { err: format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id) })
                }
 
                let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
@@ -2913,9 +2923,9 @@ where
                                                                                        }
                                                                                }
                                                                                if let PendingHTLCRouting::Forward { onion_packet, .. } = routing {
-                                                                                       let phantom_secret_res = self.keys_manager.get_node_secret(Recipient::PhantomNode);
-                                                                                       if phantom_secret_res.is_ok() && fake_scid::is_valid_phantom(&self.fake_scid_rand_bytes, short_chan_id, &self.genesis_hash) {
-                                                                                               let phantom_shared_secret = SharedSecret::new(&onion_packet.public_key.unwrap(), &phantom_secret_res.unwrap()).secret_bytes();
+                                                                                       let phantom_pubkey_res = self.node_signer.get_node_id(Recipient::PhantomNode);
+                                                                                       if phantom_pubkey_res.is_ok() && fake_scid::is_valid_phantom(&self.fake_scid_rand_bytes, short_chan_id, &self.genesis_hash) {
+                                                                                               let phantom_shared_secret = self.node_signer.ecdh(Recipient::PhantomNode, &onion_packet.public_key.unwrap(), None).unwrap().secret_bytes();
                                                                                                let next_hop = match onion_utils::decode_next_payment_hop(phantom_shared_secret, &onion_packet.hop_data, onion_packet.hmac, payment_hash) {
                                                                                                        Ok(res) => res,
                                                                                                        Err(onion_utils::OnionDecodeErr::Malformed { err_msg, err_code }) => {
@@ -3091,7 +3101,7 @@ where
                                                                let phantom_shared_secret = claimable_htlc.prev_hop.phantom_shared_secret;
                                                                let mut receiver_node_id = self.our_network_pubkey;
                                                                if phantom_shared_secret.is_some() {
-                                                                       receiver_node_id = self.keys_manager.get_node_id(Recipient::PhantomNode)
+                                                                       receiver_node_id = self.node_signer.get_node_id(Recipient::PhantomNode)
                                                                                .expect("Failed to get node_id for phantom node recipient");
                                                                }
 
@@ -3274,7 +3284,7 @@ where
                                BackgroundEvent::ClosingMonitorUpdate((funding_txo, update)) => {
                                        // The channel has already been closed, so no use bothering to care about the
                                        // monitor updating completing.
-                                       let _ = self.chain_monitor.update_channel(funding_txo, update);
+                                       let _ = self.chain_monitor.update_channel(funding_txo, &update);
                                },
                        }
                }
@@ -3287,7 +3297,7 @@ where
                self.process_background_events();
        }
 
-       fn update_channel_fee(&self, chan_id: &[u8; 32], chan: &mut Channel<<K::Target as SignerProvider>::Signer>, new_feerate: u32) -> NotifyOption {
+       fn update_channel_fee(&self, chan_id: &[u8; 32], chan: &mut Channel<<SP::Target as SignerProvider>::Signer>, new_feerate: u32) -> NotifyOption {
                if !chan.is_outbound() { return NotifyOption::SkipPersist; }
                // If the feerate has decreased by less than half, don't bother
                if new_feerate <= chan.get_feerate() && new_feerate * 2 > chan.get_feerate() {
@@ -3482,7 +3492,7 @@ where
        ///
        /// This is for failures on the channel on which the HTLC was *received*, not failures
        /// forwarding
-       fn get_htlc_inbound_temp_fail_err_and_data(&self, desired_err_code: u16, chan: &Channel<<K::Target as SignerProvider>::Signer>) -> (u16, Vec<u8>) {
+       fn get_htlc_inbound_temp_fail_err_and_data(&self, desired_err_code: u16, chan: &Channel<<SP::Target as SignerProvider>::Signer>) -> (u16, Vec<u8>) {
                // We can't be sure what SCID was used when relaying inbound towards us, so we have to
                // guess somewhat. If its a public channel, we figure best to just use the real SCID (as
                // we're not leaking that we have a channel with the counterparty), otherwise we try to use
@@ -3502,7 +3512,7 @@ where
 
        /// Gets an HTLC onion failure code and error data for an `UPDATE` error, given the error code
        /// that we want to return and a channel.
-       fn get_htlc_temp_fail_err_and_data(&self, desired_err_code: u16, scid: u64, chan: &Channel<<K::Target as SignerProvider>::Signer>) -> (u16, Vec<u8>) {
+       fn get_htlc_temp_fail_err_and_data(&self, desired_err_code: u16, scid: u64, chan: &Channel<<SP::Target as SignerProvider>::Signer>) -> (u16, Vec<u8>) {
                debug_assert_eq!(desired_err_code & 0x1000, 0x1000);
                if let Ok(upd) = self.get_channel_update_for_onion(scid, chan) {
                        let mut enc = VecWriter(Vec::with_capacity(upd.serialized_length() + 6));
@@ -3555,14 +3565,17 @@ where
        /// Fails an HTLC backwards to the sender of it to us.
        /// Note that we do not assume that channels corresponding to failed HTLCs are still available.
        fn fail_htlc_backwards_internal(&self, source: &HTLCSource, payment_hash: &PaymentHash, onion_error: &HTLCFailReason, destination: HTLCDestination) {
-               #[cfg(debug_assertions)]
+               #[cfg(any(feature = "_test_utils", test))]
                {
                        // Ensure that no peer state channel storage lock is not held when calling this
                        // function.
                        // This ensures that future code doesn't introduce a lock_order requirement for
-                       // `forward_htlcs` to be locked after the `per_peer_state` locks, which calling this
-                       // function with the `per_peer_state` aquired would.
-                       assert!(self.per_peer_state.try_write().is_ok());
+                       // `forward_htlcs` to be locked after the `per_peer_state` peer locks, which calling
+                       // this function with any `per_peer_state` peer lock aquired would.
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       for (_, peer) in per_peer_state.iter() {
+                               debug_assert!(peer.try_lock().is_ok());
+                       }
                }
 
                //TODO: There is a timing attack here where if a node fails an HTLC back to us they can
@@ -3637,7 +3650,7 @@ where
                                let mut receiver_node_id = self.our_network_pubkey;
                                for htlc in sources.iter() {
                                        if htlc.prev_hop.phantom_shared_secret.is_some() {
-                                               let phantom_pubkey = self.keys_manager.get_node_id(Recipient::PhantomNode)
+                                               let phantom_pubkey = self.node_signer.get_node_id(Recipient::PhantomNode)
                                                        .expect("Failed to get node_id for phantom node recipient");
                                                receiver_node_id = phantom_pubkey;
                                                break;
@@ -3771,7 +3784,7 @@ where
        }
 
        fn claim_funds_from_hop<ComplFunc: FnOnce(Option<u64>) -> Option<MonitorUpdateCompletionAction>>(&self,
-               per_peer_state_lock: RwLockReadGuard<HashMap<PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>>>,
+               per_peer_state_lock: RwLockReadGuard<HashMap<PublicKey, Mutex<PeerState<<SP::Target as SignerProvider>::Signer>>>>,
                prev_hop: HTLCPreviousHopData, payment_preimage: PaymentPreimage, completion_action: ComplFunc)
        -> Result<(), (PublicKey, MsgHandleErrInternal)> {
                //TODO: Delay the claimed_funds relaying just like we do outbound relay!
@@ -3797,7 +3810,7 @@ where
                                match chan.get_mut().get_update_fulfill_htlc_and_commit(prev_hop.htlc_id, payment_preimage, &self.logger) {
                                        Ok(msgs_monitor_option) => {
                                                if let UpdateFulfillCommitFetch::NewClaim { msgs, htlc_value_msat, monitor_update } = msgs_monitor_option {
-                                                       match self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
+                                                       match self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), &monitor_update) {
                                                                ChannelMonitorUpdateStatus::Completed => {},
                                                                e => {
                                                                        log_given_level!(self.logger, if e == ChannelMonitorUpdateStatus::PermanentFailure { Level::Error } else { Level::Debug },
@@ -3834,7 +3847,7 @@ where
                                                }
                                        },
                                        Err((e, monitor_update)) => {
-                                               match self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
+                                               match self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), &monitor_update) {
                                                        ChannelMonitorUpdateStatus::Completed => {},
                                                        e => {
                                                                // TODO: This needs to be handled somehow - if we receive a monitor update
@@ -3870,7 +3883,7 @@ where
                        };
                        // We update the ChannelMonitor on the backward link, after
                        // receiving an `update_fulfill_htlc` from the forward link.
-                       let update_res = self.chain_monitor.update_channel(prev_hop.outpoint, preimage_update);
+                       let update_res = self.chain_monitor.update_channel(prev_hop.outpoint, &preimage_update);
                        if update_res != ChannelMonitorUpdateStatus::Completed {
                                // TODO: This needs to be handled somehow - if we receive a monitor update
                                // with a preimage we *must* somehow manage to propagate it to the upstream
@@ -3954,7 +3967,7 @@ where
        /// Handles a channel reentering a functional state, either due to reconnect or a monitor
        /// update completion.
        fn handle_channel_resumption(&self, pending_msg_events: &mut Vec<MessageSendEvent>,
-               channel: &mut Channel<<K::Target as SignerProvider>::Signer>, raa: Option<msgs::RevokeAndACK>,
+               channel: &mut Channel<<SP::Target as SignerProvider>::Signer>, raa: Option<msgs::RevokeAndACK>,
                commitment_update: Option<msgs::CommitmentUpdate>, order: RAACommitmentOrder,
                pending_forwards: Vec<(PendingHTLCInfo, u64)>, funding_broadcastable: Option<Transaction>,
                channel_ready: Option<msgs::ChannelReady>, announcement_sigs: Option<msgs::AnnouncementSignatures>)
@@ -4047,7 +4060,7 @@ where
                                return;
                        }
 
-                       let updates = channel.get_mut().monitor_updating_restored(&self.logger, self.get_our_node_id(), self.genesis_hash, self.best_block.read().unwrap().height());
+                       let updates = channel.get_mut().monitor_updating_restored(&self.logger, &self.node_signer, self.genesis_hash, &self.default_configuration, self.best_block.read().unwrap().height());
                        let channel_update = if updates.channel_ready.is_some() && channel.get().is_usable() {
                                // We only send a channel_update in the case where we are just now sending a
                                // channel_ready and the channel is in a usable state. We may re-send a
@@ -4161,7 +4174,7 @@ where
                Ok(())
        }
 
-       fn internal_open_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel) -> Result<(), MsgHandleErrInternal> {
+       fn internal_open_channel(&self, counterparty_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<(), MsgHandleErrInternal> {
                if msg.chain_hash != self.genesis_hash {
                        return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash".to_owned(), msg.temporary_channel_id.clone()));
                }
@@ -4171,12 +4184,19 @@ where
                }
 
                let mut random_bytes = [0u8; 16];
-               random_bytes.copy_from_slice(&self.keys_manager.get_secure_random_bytes()[..16]);
+               random_bytes.copy_from_slice(&self.entropy_source.get_secure_random_bytes()[..16]);
                let user_channel_id = u128::from_be_bytes(random_bytes);
 
                let outbound_scid_alias = self.create_and_insert_outbound_scid_alias();
-               let mut channel = match Channel::new_from_req(&self.fee_estimator, &self.keys_manager,
-                       counterparty_node_id.clone(), &their_features, msg, user_channel_id, &self.default_configuration,
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.temporary_channel_id.clone()))
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               let mut channel = match Channel::new_from_req(&self.fee_estimator, &self.entropy_source, &self.signer_provider,
+                       counterparty_node_id.clone(), &self.channel_type_features(), &peer_state.latest_features, msg, user_channel_id, &self.default_configuration,
                        self.best_block.read().unwrap().height(), &self.logger, outbound_scid_alias)
                {
                        Err(e) => {
@@ -4185,13 +4205,6 @@ where
                        },
                        Ok(res) => res
                };
-               let per_peer_state = self.per_peer_state.read().unwrap();
-               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
-               if let None = peer_state_mutex_opt {
-                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.temporary_channel_id.clone()))
-               }
-               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
-               let peer_state = &mut *peer_state_lock;
                match peer_state.channel_by_id.entry(channel.channel_id()) {
                        hash_map::Entry::Occupied(_) => {
                                self.outbound_scid_aliases.lock().unwrap().remove(&outbound_scid_alias);
@@ -4225,7 +4238,7 @@ where
                Ok(())
        }
 
-       fn internal_accept_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
+       fn internal_accept_channel(&self, counterparty_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
                let (value, output_script, user_id) = {
                        let per_peer_state = self.per_peer_state.read().unwrap();
                        let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
@@ -4236,7 +4249,7 @@ where
                        let peer_state = &mut *peer_state_lock;
                        match peer_state.channel_by_id.entry(msg.temporary_channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       try_chan_entry!(self, chan.get_mut().accept_channel(&msg, &self.default_configuration.channel_handshake_limits, &their_features), chan);
+                                       try_chan_entry!(self, chan.get_mut().accept_channel(&msg, &self.default_configuration.channel_handshake_limits, &peer_state.latest_features), chan);
                                        (chan.get().get_value_satoshis(), chan.get().get_funding_redeemscript().to_v0_p2wsh(), chan.get().get_user_id())
                                },
                                hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.temporary_channel_id))
@@ -4265,7 +4278,7 @@ where
                        let peer_state = &mut *peer_state_lock;
                        match peer_state.channel_by_id.entry(msg.temporary_channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       (try_chan_entry!(self, chan.get_mut().funding_created(msg, best_block, &self.keys_manager, &self.logger), chan), chan.remove())
+                                       (try_chan_entry!(self, chan.get_mut().funding_created(msg, best_block, &self.signer_provider, &self.logger), chan), chan.remove())
                                },
                                hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.temporary_channel_id))
                        }
@@ -4342,7 +4355,7 @@ where
                        let peer_state = &mut *peer_state_lock;
                        match peer_state.channel_by_id.entry(msg.channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       let (monitor, funding_tx, channel_ready) = match chan.get_mut().funding_signed(&msg, best_block, &self.keys_manager, &self.logger) {
+                                       let (monitor, funding_tx, channel_ready) = match chan.get_mut().funding_signed(&msg, best_block, &self.signer_provider, &self.logger) {
                                                Ok(update) => update,
                                                Err(e) => try_chan_entry!(self, Err(e), chan),
                                        };
@@ -4384,8 +4397,8 @@ where
                let peer_state = &mut *peer_state_lock;
                match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               let announcement_sigs_opt = try_chan_entry!(self, chan.get_mut().channel_ready(&msg, self.get_our_node_id(),
-                                       self.genesis_hash.clone(), &self.best_block.read().unwrap(), &self.logger), chan);
+                               let announcement_sigs_opt = try_chan_entry!(self, chan.get_mut().channel_ready(&msg, &self.node_signer,
+                                       self.genesis_hash.clone(), &self.default_configuration, &self.best_block.read().unwrap(), &self.logger), chan);
                                if let Some(announcement_sigs) = announcement_sigs_opt {
                                        log_trace!(self.logger, "Sending announcement_signatures for channel {}", log_bytes!(chan.get().channel_id()));
                                        peer_state.pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
@@ -4415,7 +4428,7 @@ where
                }
        }
 
-       fn internal_shutdown(&self, counterparty_node_id: &PublicKey, their_features: &InitFeatures, msg: &msgs::Shutdown) -> Result<(), MsgHandleErrInternal> {
+       fn internal_shutdown(&self, counterparty_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(), MsgHandleErrInternal> {
                let mut dropped_htlcs: Vec<(HTLCSource, PaymentHash)>;
                let result: Result<(), _> = loop {
                        let per_peer_state = self.per_peer_state.read().unwrap();
@@ -4434,12 +4447,12 @@ where
                                                        if chan_entry.get().sent_shutdown() { " after we initiated shutdown" } else { "" });
                                        }
 
-                                       let (shutdown, monitor_update, htlcs) = try_chan_entry!(self, chan_entry.get_mut().shutdown(&self.keys_manager, &their_features, &msg), chan_entry);
+                                       let (shutdown, monitor_update, htlcs) = try_chan_entry!(self, chan_entry.get_mut().shutdown(&self.signer_provider, &peer_state.latest_features, &msg), chan_entry);
                                        dropped_htlcs = htlcs;
 
                                        // Update the monitor with the shutdown script if necessary.
                                        if let Some(monitor_update) = monitor_update {
-                                               let update_res = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), monitor_update);
+                                               let update_res = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), &monitor_update);
                                                let (result, is_permanent) =
                                                        handle_monitor_update_res!(self, update_res, chan_entry.get_mut(), RAACommitmentOrder::CommitmentFirst, chan_entry.key(), NO_UPDATE);
                                                if is_permanent {
@@ -4538,7 +4551,7 @@ where
                match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
 
-                               let create_pending_htlc_status = |chan: &Channel<<K::Target as SignerProvider>::Signer>, pending_forward_info: PendingHTLCStatus, error_code: u16| {
+                               let create_pending_htlc_status = |chan: &Channel<<SP::Target as SignerProvider>::Signer>, pending_forward_info: PendingHTLCStatus, error_code: u16| {
                                        // If the update_add is completely bogus, the call will Err and we will close,
                                        // but if we've sent a shutdown and they haven't acknowledged it yet, we just
                                        // want to reject the new HTLC and fail it backwards instead of forwarding.
@@ -4640,13 +4653,13 @@ where
                                                Err((None, e)) => try_chan_entry!(self, Err(e), chan),
                                                Err((Some(update), e)) => {
                                                        assert!(chan.get().is_awaiting_monitor_update());
-                                                       let _ = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), update);
+                                                       let _ = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), &update);
                                                        try_chan_entry!(self, Err(e), chan);
                                                        unreachable!();
                                                },
                                                Ok(res) => res
                                        };
-                               let update_res = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update);
+                               let update_res = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), &monitor_update);
                                if let Err(e) = handle_monitor_update_res!(self, update_res, chan, RAACommitmentOrder::RevokeAndACKFirst, true, commitment_signed.is_some()) {
                                        return Err(e);
                                }
@@ -4782,7 +4795,7 @@ where
                                        let raa_updates = break_chan_entry!(self,
                                                chan.get_mut().revoke_and_ack(&msg, &self.logger), chan);
                                        htlcs_to_fail = raa_updates.holding_cell_failed_htlcs;
-                                       let update_res = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), raa_updates.monitor_update);
+                                       let update_res = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), &raa_updates.monitor_update);
                                        if was_paused_for_mon_update {
                                                assert!(update_res != ChannelMonitorUpdateStatus::Completed);
                                                assert!(raa_updates.commitment_update.is_none());
@@ -4866,7 +4879,9 @@ where
 
                                peer_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
                                        msg: try_chan_entry!(self, chan.get_mut().announcement_signatures(
-                                               self.get_our_node_id(), self.genesis_hash.clone(), self.best_block.read().unwrap().height(), msg), chan),
+                                               &self.node_signer, self.genesis_hash.clone(), self.best_block.read().unwrap().height(),
+                                               msg, &self.default_configuration
+                                       ), chan),
                                        // Note that announcement_signatures fails if the channel cannot be announced,
                                        // so get_channel_update_for_broadcast will never fail by the time we get here.
                                        update_msg: self.get_channel_update_for_broadcast(chan.get()).unwrap(),
@@ -4936,8 +4951,8 @@ where
                                        // freed HTLCs to fail backwards. If in the future we no longer drop pending
                                        // add-HTLCs on disconnect, we may be handed HTLCs to fail backwards here.
                                        let responses = try_chan_entry!(self, chan.get_mut().channel_reestablish(
-                                               msg, &self.logger, self.our_network_pubkey.clone(), self.genesis_hash,
-                                               &*self.best_block.read().unwrap()), chan);
+                                               msg, &self.logger, &self.node_signer, self.genesis_hash,
+                                               &self.default_configuration, &*self.best_block.read().unwrap()), chan);
                                        let mut channel_update = None;
                                        if let Some(msg) = responses.shutdown_msg {
                                                peer_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
@@ -5085,7 +5100,7 @@ where
                                                                ));
                                                        }
                                                        if let Some((commitment_update, monitor_update)) = commitment_opt {
-                                                               match self.chain_monitor.update_channel(chan.get_funding_txo().unwrap(), monitor_update) {
+                                                               match self.chain_monitor.update_channel(chan.get_funding_txo().unwrap(), &monitor_update) {
                                                                        ChannelMonitorUpdateStatus::Completed => {
                                                                                pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
                                                                                        node_id: chan.get_counterparty_node_id(),
@@ -5212,7 +5227,7 @@ where
                        return Err(APIError::APIMisuseError { err: format!("min_value_msat of {} greater than total 21 million bitcoin supply", min_value_msat.unwrap()) });
                }
 
-               let payment_secret = PaymentSecret(self.keys_manager.get_secure_random_bytes());
+               let payment_secret = PaymentSecret(self.entropy_source.get_secure_random_bytes());
 
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
                let mut payment_secrets = self.pending_inbound_payments.lock().unwrap();
@@ -5263,7 +5278,7 @@ where
        /// [`PaymentClaimable::payment_preimage`]: events::Event::PaymentClaimable::payment_preimage
        /// [`create_inbound_payment_for_hash`]: Self::create_inbound_payment_for_hash
        pub fn create_inbound_payment(&self, min_value_msat: Option<u64>, invoice_expiry_delta_secs: u32) -> Result<(PaymentHash, PaymentSecret), ()> {
-               inbound_payment::create(&self.inbound_payment_key, min_value_msat, invoice_expiry_delta_secs, &self.keys_manager, self.highest_seen_timestamp.load(Ordering::Acquire) as u64)
+               inbound_payment::create(&self.inbound_payment_key, min_value_msat, invoice_expiry_delta_secs, &self.entropy_source, self.highest_seen_timestamp.load(Ordering::Acquire) as u64)
        }
 
        /// Legacy version of [`create_inbound_payment`]. Use this method if you wish to share
@@ -5277,7 +5292,7 @@ where
        /// [`create_inbound_payment`]: Self::create_inbound_payment
        #[deprecated]
        pub fn create_inbound_payment_legacy(&self, min_value_msat: Option<u64>, invoice_expiry_delta_secs: u32) -> Result<(PaymentHash, PaymentSecret), APIError> {
-               let payment_preimage = PaymentPreimage(self.keys_manager.get_secure_random_bytes());
+               let payment_preimage = PaymentPreimage(self.entropy_source.get_secure_random_bytes());
                let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
                let payment_secret = self.set_payment_hash_secret_map(payment_hash, Some(payment_preimage), min_value_msat, invoice_expiry_delta_secs)?;
                Ok((payment_hash, payment_secret))
@@ -5360,7 +5375,7 @@ where
                let best_block_height = self.best_block.read().unwrap().height();
                let short_to_chan_info = self.short_to_chan_info.read().unwrap();
                loop {
-                       let scid_candidate = fake_scid::Namespace::Phantom.get_fake_scid(best_block_height, &self.genesis_hash, &self.fake_scid_rand_bytes, &self.keys_manager);
+                       let scid_candidate = fake_scid::Namespace::Phantom.get_fake_scid(best_block_height, &self.genesis_hash, &self.fake_scid_rand_bytes, &self.entropy_source);
                        // Ensure the generated scid doesn't conflict with a real channel.
                        match short_to_chan_info.get(&scid_candidate) {
                                Some(_) => continue,
@@ -5390,7 +5405,7 @@ where
                let best_block_height = self.best_block.read().unwrap().height();
                let short_to_chan_info = self.short_to_chan_info.read().unwrap();
                loop {
-                       let scid_candidate = fake_scid::Namespace::Intercept.get_fake_scid(best_block_height, &self.genesis_hash, &self.fake_scid_rand_bytes, &self.keys_manager);
+                       let scid_candidate = fake_scid::Namespace::Intercept.get_fake_scid(best_block_height, &self.genesis_hash, &self.fake_scid_rand_bytes, &self.entropy_source);
                        // Ensure the generated scid doesn't conflict with a real channel.
                        if short_to_chan_info.contains_key(&scid_candidate) { continue }
                        return scid_candidate
@@ -5476,11 +5491,13 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> MessageSendEventsProvider for ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> MessageSendEventsProvider for ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -5538,11 +5555,13 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> EventsProvider for ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> EventsProvider for ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -5575,11 +5594,13 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> chain::Listen for ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> chain::Listen for ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -5609,15 +5630,17 @@ where
                        *best_block = BestBlock::new(header.prev_blockhash, new_height)
                }
 
-               self.do_chain_event(Some(new_height), |channel| channel.best_block_updated(new_height, header.time, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger));
+               self.do_chain_event(Some(new_height), |channel| channel.best_block_updated(new_height, header.time, self.genesis_hash.clone(), &self.node_signer, &self.default_configuration, &self.logger));
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> chain::Confirm for ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> chain::Confirm for ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -5631,13 +5654,13 @@ where
                log_trace!(self.logger, "{} transactions included in block {} at height {} provided", txdata.len(), block_hash, height);
 
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
-               self.do_chain_event(Some(height), |channel| channel.transactions_confirmed(&block_hash, height, txdata, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger)
+               self.do_chain_event(Some(height), |channel| channel.transactions_confirmed(&block_hash, height, txdata, self.genesis_hash.clone(), &self.node_signer, &self.default_configuration, &self.logger)
                        .map(|(a, b)| (a, Vec::new(), b)));
 
                let last_best_block_height = self.best_block.read().unwrap().height();
                if height < last_best_block_height {
                        let timestamp = self.highest_seen_timestamp.load(Ordering::Acquire);
-                       self.do_chain_event(Some(last_best_block_height), |channel| channel.best_block_updated(last_best_block_height, timestamp as u32, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger));
+                       self.do_chain_event(Some(last_best_block_height), |channel| channel.best_block_updated(last_best_block_height, timestamp as u32, self.genesis_hash.clone(), &self.node_signer, &self.default_configuration, &self.logger));
                }
        }
 
@@ -5653,7 +5676,7 @@ where
 
                *self.best_block.write().unwrap() = BestBlock::new(block_hash, height);
 
-               self.do_chain_event(Some(height), |channel| channel.best_block_updated(height, header.time, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger));
+               self.do_chain_event(Some(height), |channel| channel.best_block_updated(height, header.time, self.genesis_hash.clone(), &self.node_signer, &self.default_configuration, &self.logger));
 
                macro_rules! max_time {
                        ($timestamp: expr) => {
@@ -5704,11 +5727,13 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -5716,7 +5741,7 @@ where
        /// Calls a function which handles an on-chain event (blocks dis/connected, transactions
        /// un/confirmed, etc) on each channel, handling any resulting errors or messages generated by
        /// the function.
-       fn do_chain_event<FN: Fn(&mut Channel<<K::Target as SignerProvider>::Signer>) -> Result<(Option<msgs::ChannelReady>, Vec<(HTLCSource, PaymentHash)>, Option<msgs::AnnouncementSignatures>), ClosureReason>>
+       fn do_chain_event<FN: Fn(&mut Channel<<SP::Target as SignerProvider>::Signer>) -> Result<(Option<msgs::ChannelReady>, Vec<(HTLCSource, PaymentHash)>, Option<msgs::AnnouncementSignatures>), ClosureReason>>
                        (&self, height_opt: Option<u32>, f: FN) {
                // Note that we MUST NOT end up calling methods on self.chain_monitor here - we're called
                // during initialization prior to the chain_monitor being fully configured in some cases.
@@ -5762,7 +5787,7 @@ where
                                                                msg: announcement_sigs,
                                                        });
                                                        if let Some(height) = height_opt {
-                                                               if let Some(announcement) = channel.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash, height) {
+                                                               if let Some(announcement) = channel.get_signed_channel_announcement(&self.node_signer, self.genesis_hash, height, &self.default_configuration) {
                                                                        pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
                                                                                msg: announcement,
                                                                                // Note that announcement_signatures fails if the channel cannot be announced,
@@ -5906,26 +5931,62 @@ where
        pub fn current_best_block(&self) -> BestBlock {
                self.best_block.read().unwrap().clone()
        }
+
+       /// Fetches the set of [`NodeFeatures`] flags which are provided by or required by
+       /// [`ChannelManager`].
+       pub fn node_features(&self) -> NodeFeatures {
+               provided_node_features(&self.default_configuration)
+       }
+
+       /// Fetches the set of [`InvoiceFeatures`] flags which are provided by or required by
+       /// [`ChannelManager`].
+       ///
+       /// Note that the invoice feature flags can vary depending on if the invoice is a "phantom invoice"
+       /// or not. Thus, this method is not public.
+       #[cfg(any(feature = "_test_utils", test))]
+       pub fn invoice_features(&self) -> InvoiceFeatures {
+               provided_invoice_features(&self.default_configuration)
+       }
+
+       /// Fetches the set of [`ChannelFeatures`] flags which are provided by or required by
+       /// [`ChannelManager`].
+       pub fn channel_features(&self) -> ChannelFeatures {
+               provided_channel_features(&self.default_configuration)
+       }
+
+       /// Fetches the set of [`ChannelTypeFeatures`] flags which are provided by or required by
+       /// [`ChannelManager`].
+       pub fn channel_type_features(&self) -> ChannelTypeFeatures {
+               provided_channel_type_features(&self.default_configuration)
+       }
+
+       /// Fetches the set of [`InitFeatures`] flags which are provided by or required by
+       /// [`ChannelManager`].
+       pub fn init_features(&self) -> InitFeatures {
+               provided_init_features(&self.default_configuration)
+       }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
-       ChannelMessageHandler for ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>
+       ChannelMessageHandler for ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
 {
-       fn handle_open_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel) {
+       fn handle_open_channel(&self, counterparty_node_id: &PublicKey, msg: &msgs::OpenChannel) {
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
-               let _ = handle_error!(self, self.internal_open_channel(counterparty_node_id, their_features, msg), *counterparty_node_id);
+               let _ = handle_error!(self, self.internal_open_channel(counterparty_node_id, msg), *counterparty_node_id);
        }
 
-       fn handle_accept_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::AcceptChannel) {
+       fn handle_accept_channel(&self, counterparty_node_id: &PublicKey, msg: &msgs::AcceptChannel) {
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
-               let _ = handle_error!(self, self.internal_accept_channel(counterparty_node_id, their_features, msg), *counterparty_node_id);
+               let _ = handle_error!(self, self.internal_accept_channel(counterparty_node_id, msg), *counterparty_node_id);
        }
 
        fn handle_funding_created(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingCreated) {
@@ -5943,9 +6004,9 @@ where
                let _ = handle_error!(self, self.internal_channel_ready(counterparty_node_id, msg), *counterparty_node_id);
        }
 
-       fn handle_shutdown(&self, counterparty_node_id: &PublicKey, their_features: &InitFeatures, msg: &msgs::Shutdown) {
+       fn handle_shutdown(&self, counterparty_node_id: &PublicKey, msg: &msgs::Shutdown) {
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
-               let _ = handle_error!(self, self.internal_shutdown(counterparty_node_id, their_features, msg), *counterparty_node_id);
+               let _ = handle_error!(self, self.internal_shutdown(counterparty_node_id, msg), *counterparty_node_id);
        }
 
        fn handle_closing_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
@@ -6116,7 +6177,7 @@ where
                                        }
                                } else { true };
                                if retain && chan.get_counterparty_node_id() != *counterparty_node_id {
-                                       if let Some(msg) = chan.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone(), self.best_block.read().unwrap().height()) {
+                                       if let Some(msg) = chan.get_signed_channel_announcement(&self.node_signer, self.genesis_hash.clone(), self.best_block.read().unwrap().height(), &self.default_configuration) {
                                                if let Ok(update_msg) = self.get_channel_update_for_broadcast(chan) {
                                                        pending_msg_events.push(events::MessageSendEvent::SendChannelAnnouncement {
                                                                node_id: *counterparty_node_id,
@@ -6173,18 +6234,18 @@ where
        }
 
        fn provided_node_features(&self) -> NodeFeatures {
-               provided_node_features()
+               provided_node_features(&self.default_configuration)
        }
 
        fn provided_init_features(&self, _their_init_features: &PublicKey) -> InitFeatures {
-               provided_init_features()
+               provided_init_features(&self.default_configuration)
        }
 }
 
 /// Fetches the set of [`NodeFeatures`] flags which are provided by or required by
 /// [`ChannelManager`].
-pub fn provided_node_features() -> NodeFeatures {
-       provided_init_features().to_context()
+pub(crate) fn provided_node_features(config: &UserConfig) -> NodeFeatures {
+       provided_init_features(config).to_context()
 }
 
 /// Fetches the set of [`InvoiceFeatures`] flags which are provided by or required by
@@ -6193,19 +6254,25 @@ pub fn provided_node_features() -> NodeFeatures {
 /// Note that the invoice feature flags can vary depending on if the invoice is a "phantom invoice"
 /// or not. Thus, this method is not public.
 #[cfg(any(feature = "_test_utils", test))]
-pub fn provided_invoice_features() -> InvoiceFeatures {
-       provided_init_features().to_context()
+pub(crate) fn provided_invoice_features(config: &UserConfig) -> InvoiceFeatures {
+       provided_init_features(config).to_context()
 }
 
 /// Fetches the set of [`ChannelFeatures`] flags which are provided by or required by
 /// [`ChannelManager`].
-pub fn provided_channel_features() -> ChannelFeatures {
-       provided_init_features().to_context()
+pub(crate) fn provided_channel_features(config: &UserConfig) -> ChannelFeatures {
+       provided_init_features(config).to_context()
+}
+
+/// Fetches the set of [`ChannelTypeFeatures`] flags which are provided by or required by
+/// [`ChannelManager`].
+pub(crate) fn provided_channel_type_features(config: &UserConfig) -> ChannelTypeFeatures {
+       ChannelTypeFeatures::from_init(&provided_init_features(config))
 }
 
 /// Fetches the set of [`InitFeatures`] flags which are provided by or required by
 /// [`ChannelManager`].
-pub fn provided_init_features() -> InitFeatures {
+pub fn provided_init_features(_config: &UserConfig) -> InitFeatures {
        // Note that if new features are added here which other peers may (eventually) require, we
        // should also add the corresponding (optional) bit to the ChannelMessageHandler impl for
        // ErroringMessageHandler.
@@ -6221,6 +6288,12 @@ pub fn provided_init_features() -> InitFeatures {
        features.set_channel_type_optional();
        features.set_scid_privacy_optional();
        features.set_zero_conf_optional();
+       #[cfg(anchors)]
+       { // Attributes are not allowed on if expressions on our current MSRV of 1.41.
+               if _config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx {
+                       features.set_anchors_zero_fee_htlc_tx_optional();
+               }
+       }
        features
 }
 
@@ -6612,11 +6685,13 @@ impl_writeable_tlv_based!(PendingInboundPayment, {
        (8, min_value_msat, required),
 });
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> Writeable for ChannelManager<M, T, K, F, R, L>
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> Writeable for ChannelManager<M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -6673,6 +6748,8 @@ where
                        }
                }
 
+               let per_peer_state = self.per_peer_state.write().unwrap();
+
                let pending_inbound_payments = self.pending_inbound_payments.lock().unwrap();
                let claimable_payments = self.claimable_payments.lock().unwrap();
                let pending_outbound_payments = self.pending_outbound_payments.pending_outbound_payments.lock().unwrap();
@@ -6688,7 +6765,6 @@ where
                        htlc_purposes.push(purpose);
                }
 
-               let per_peer_state = self.per_peer_state.write().unwrap();
                (per_peer_state.len() as u64).write(writer)?;
                for (peer_pubkey, peer_state_mutex) in per_peer_state.iter() {
                        peer_pubkey.write(writer)?;
@@ -6821,19 +6897,27 @@ where
 /// which you've already broadcasted the transaction.
 ///
 /// [`ChainMonitor`]: crate::chain::chainmonitor::ChainMonitor
-pub struct ChannelManagerReadArgs<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+pub struct ChannelManagerReadArgs<'a, M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
 {
+       /// A cryptographically secure source of entropy.
+       pub entropy_source: ES,
+
+       /// A signer that is able to perform node-scoped cryptographic operations.
+       pub node_signer: NS,
+
        /// The keys provider which will give us relevant keys. Some keys will be loaded during
        /// deserialization and KeysInterface::read_chan_signer will be used to read per-Channel
        /// signing data.
-       pub keys_manager: K,
+       pub signer_provider: SP,
 
        /// The fee_estimator for use in the ChannelManager in the future.
        ///
@@ -6874,15 +6958,17 @@ where
        /// this struct.
        ///
        /// (C-not exported) because we have no HashMap bindings
-       pub channel_monitors: HashMap<OutPoint, &'a mut ChannelMonitor<<K::Target as SignerProvider>::Signer>>,
+       pub channel_monitors: HashMap<OutPoint, &'a mut ChannelMonitor<<SP::Target as SignerProvider>::Signer>>,
 }
 
-impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
-               ChannelManagerReadArgs<'a, M, T, K, F, R, L>
+impl<'a, M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>
+               ChannelManagerReadArgs<'a, M, T, ES, NS, SP, F, R, L>
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
@@ -6890,10 +6976,10 @@ where
        /// Simple utility function to create a ChannelManagerReadArgs which creates the monitor
        /// HashMap for you. This is primarily useful for C bindings where it is not practical to
        /// populate a HashMap directly from C.
-       pub fn new(keys_manager: K, fee_estimator: F, chain_monitor: M, tx_broadcaster: T, router: R, logger: L, default_config: UserConfig,
-                       mut channel_monitors: Vec<&'a mut ChannelMonitor<<K::Target as SignerProvider>::Signer>>) -> Self {
+       pub fn new(entropy_source: ES, node_signer: NS, signer_provider: SP, fee_estimator: F, chain_monitor: M, tx_broadcaster: T, router: R, logger: L, default_config: UserConfig,
+                       mut channel_monitors: Vec<&'a mut ChannelMonitor<<SP::Target as SignerProvider>::Signer>>) -> Self {
                Self {
-                       keys_manager, fee_estimator, chain_monitor, tx_broadcaster, router, logger, default_config,
+                       entropy_source, node_signer, signer_provider, fee_estimator, chain_monitor, tx_broadcaster, router, logger, default_config,
                        channel_monitors: channel_monitors.drain(..).map(|monitor| { (monitor.get_funding_txo().0, monitor) }).collect()
                }
        }
@@ -6901,33 +6987,37 @@ where
 
 // Implement ReadableArgs for an Arc'd ChannelManager to make it a bit easier to work with the
 // SipmleArcChannelManager type:
-impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
-       ReadableArgs<ChannelManagerReadArgs<'a, M, T, K, F, R, L>> for (BlockHash, Arc<ChannelManager<M, T, K, F, R, L>>)
+impl<'a, M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>
+       ReadableArgs<ChannelManagerReadArgs<'a, M, T, ES, NS, SP, F, R, L>> for (BlockHash, Arc<ChannelManager<M, T, ES, NS, SP, F, R, L>>)
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
 {
-       fn read<Reader: io::Read>(reader: &mut Reader, args: ChannelManagerReadArgs<'a, M, T, K, F, R, L>) -> Result<Self, DecodeError> {
-               let (blockhash, chan_manager) = <(BlockHash, ChannelManager<M, T, K, F, R, L>)>::read(reader, args)?;
+       fn read<Reader: io::Read>(reader: &mut Reader, args: ChannelManagerReadArgs<'a, M, T, ES, NS, SP, F, R, L>) -> Result<Self, DecodeError> {
+               let (blockhash, chan_manager) = <(BlockHash, ChannelManager<M, T, ES, NS, SP, F, R, L>)>::read(reader, args)?;
                Ok((blockhash, Arc::new(chan_manager)))
        }
 }
 
-impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
-       ReadableArgs<ChannelManagerReadArgs<'a, M, T, K, F, R, L>> for (BlockHash, ChannelManager<M, T, K, F, R, L>)
+impl<'a, M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref>
+       ReadableArgs<ChannelManagerReadArgs<'a, M, T, ES, NS, SP, F, R, L>> for (BlockHash, ChannelManager<M, T, ES, NS, SP, F, R, L>)
 where
-       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       M::Target: chain::Watch<<SP::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
-       K::Target: KeysInterface,
+       ES::Target: EntropySource,
+       NS::Target: NodeSigner,
+       SP::Target: SignerProvider,
        F::Target: FeeEstimator,
        R::Target: Router,
        L::Target: Logger,
 {
-       fn read<Reader: io::Read>(reader: &mut Reader, mut args: ChannelManagerReadArgs<'a, M, T, K, F, R, L>) -> Result<Self, DecodeError> {
+       fn read<Reader: io::Read>(reader: &mut Reader, mut args: ChannelManagerReadArgs<'a, M, T, ES, NS, SP, F, R, L>) -> Result<Self, DecodeError> {
                let _ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
 
                let genesis_hash: BlockHash = Readable::read(reader)?;
@@ -6938,12 +7028,14 @@ where
 
                let channel_count: u64 = Readable::read(reader)?;
                let mut funding_txo_set = HashSet::with_capacity(cmp::min(channel_count as usize, 128));
-               let mut peer_channels: HashMap<PublicKey, HashMap<[u8; 32], Channel<<K::Target as SignerProvider>::Signer>>> = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
+               let mut peer_channels: HashMap<PublicKey, HashMap<[u8; 32], Channel<<SP::Target as SignerProvider>::Signer>>> = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
                let mut id_to_peer = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
                let mut short_to_chan_info = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
                let mut channel_closures = Vec::new();
                for _ in 0..channel_count {
-                       let mut channel: Channel<<K::Target as SignerProvider>::Signer> = Channel::read(reader, (&args.keys_manager, best_block_height))?;
+                       let mut channel: Channel<<SP::Target as SignerProvider>::Signer> = Channel::read(reader, (
+                               &args.entropy_source, &args.signer_provider, best_block_height, &provided_channel_type_features(&args.default_config)
+                       ))?;
                        let funding_txo = channel.get_funding_txo().ok_or(DecodeError::InvalidValue)?;
                        funding_txo_set.insert(funding_txo.clone());
                        if let Some(ref mut monitor) = args.channel_monitors.get_mut(&funding_txo) {
@@ -7036,7 +7128,7 @@ where
                        }
                }
 
-               for (ref funding_txo, ref mut monitor) in args.channel_monitors.iter_mut() {
+               for (funding_txo, monitor) in args.channel_monitors.iter_mut() {
                        if !funding_txo_set.contains(funding_txo) {
                                log_info!(args.logger, "Broadcasting latest holder commitment transaction for closed channel {}", log_bytes!(funding_txo.to_channel_id()));
                                monitor.broadcast_latest_holder_commitment_txn(&args.tx_broadcaster, &args.logger);
@@ -7069,7 +7161,7 @@ where
                }
 
                let peer_count: u64 = Readable::read(reader)?;
-               let mut per_peer_state = HashMap::with_capacity(cmp::min(peer_count as usize, MAX_ALLOC_SIZE/mem::size_of::<(PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>)>()));
+               let mut per_peer_state = HashMap::with_capacity(cmp::min(peer_count as usize, MAX_ALLOC_SIZE/mem::size_of::<(PublicKey, Mutex<PeerState<<SP::Target as SignerProvider>::Signer>>)>()));
                for _ in 0..peer_count {
                        let peer_pubkey = Readable::read(reader)?;
                        let peer_state = PeerState {
@@ -7142,11 +7234,11 @@ where
                        (11, probing_cookie_secret, option),
                });
                if fake_scid_rand_bytes.is_none() {
-                       fake_scid_rand_bytes = Some(args.keys_manager.get_secure_random_bytes());
+                       fake_scid_rand_bytes = Some(args.entropy_source.get_secure_random_bytes());
                }
 
                if probing_cookie_secret.is_none() {
-                       probing_cookie_secret = Some(args.keys_manager.get_secure_random_bytes());
+                       probing_cookie_secret = Some(args.entropy_source.get_secure_random_bytes());
                }
 
                if pending_outbound_payments.is_none() && pending_outbound_payments_no_retry.is_none() {
@@ -7252,7 +7344,7 @@ where
                        });
                }
 
-               let inbound_pmt_key_material = args.keys_manager.get_inbound_payment_key_material();
+               let inbound_pmt_key_material = args.node_signer.get_inbound_payment_key_material();
                let expanded_inbound_key = inbound_payment::ExpandedKey::new(&inbound_pmt_key_material);
 
                let mut claimable_htlcs = HashMap::with_capacity(claimable_htlcs_list.len());
@@ -7296,17 +7388,16 @@ where
                }
 
                let mut secp_ctx = Secp256k1::new();
-               secp_ctx.seeded_randomize(&args.keys_manager.get_secure_random_bytes());
+               secp_ctx.seeded_randomize(&args.entropy_source.get_secure_random_bytes());
 
                if !channel_closures.is_empty() {
                        pending_events_read.append(&mut channel_closures);
                }
 
-               let our_network_key = match args.keys_manager.get_node_secret(Recipient::Node) {
+               let our_network_pubkey = match args.node_signer.get_node_id(Recipient::Node) {
                        Ok(key) => key,
                        Err(()) => return Err(DecodeError::InvalidValue)
                };
-               let our_network_pubkey = PublicKey::from_secret_key(&secp_ctx, &our_network_key);
                if let Some(network_pubkey) = received_network_pubkey {
                        if network_pubkey != our_network_pubkey {
                                log_error!(args.logger, "Key that was generated does not match the existing key.");
@@ -7323,7 +7414,7 @@ where
                                        let mut outbound_scid_alias;
                                        loop {
                                                outbound_scid_alias = fake_scid::Namespace::OutboundAlias
-                                                       .get_fake_scid(best_block_height, &genesis_hash, fake_scid_rand_bytes.as_ref().unwrap(), &args.keys_manager);
+                                                       .get_fake_scid(best_block_height, &genesis_hash, fake_scid_rand_bytes.as_ref().unwrap(), &args.entropy_source);
                                                if outbound_scid_aliases.insert(outbound_scid_alias) { break; }
                                        }
                                        chan.set_outbound_scid_alias(outbound_scid_alias);
@@ -7354,7 +7445,7 @@ where
                                        let mut receiver_node_id = Some(our_network_pubkey);
                                        let phantom_shared_secret = claimable_htlcs[0].prev_hop.phantom_shared_secret;
                                        if phantom_shared_secret.is_some() {
-                                               let phantom_pubkey = args.keys_manager.get_node_id(Recipient::PhantomNode)
+                                               let phantom_pubkey = args.node_signer.get_node_id(Recipient::PhantomNode)
                                                        .expect("Failed to get node_id for phantom node recipient");
                                                receiver_node_id = Some(phantom_pubkey)
                                        }
@@ -7422,7 +7513,6 @@ where
 
                        probing_cookie_secret: probing_cookie_secret.unwrap(),
 
-                       our_network_key,
                        our_network_pubkey,
                        secp_ctx,
 
@@ -7435,7 +7525,10 @@ where
                        total_consistency_lock: RwLock::new(()),
                        persistence_notifier: Notifier::new(),
 
-                       keys_manager: args.keys_manager,
+                       entropy_source: args.entropy_source,
+                       node_signer: args.node_signer,
+                       signer_provider: args.signer_provider,
+
                        logger: args.logger,
                        default_configuration: args.default_config,
                };
@@ -7467,7 +7560,7 @@ mod tests {
        use core::time::Duration;
        use core::sync::atomic::Ordering;
        use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
-       use crate::ln::channelmanager::{self, inbound_payment, PaymentId, PaymentSendFailure, InterceptId};
+       use crate::ln::channelmanager::{inbound_payment, PaymentId, PaymentSendFailure, InterceptId};
        use crate::ln::functional_test_utils::*;
        use crate::ln::msgs;
        use crate::ln::msgs::{ChannelMessageHandler, OptionalField};
@@ -7476,7 +7569,7 @@ mod tests {
        use crate::util::events::{Event, HTLCDestination, MessageSendEvent, MessageSendEventsProvider, ClosureReason};
        use crate::util::test_utils;
        use crate::util::config::ChannelConfig;
-       use crate::chain::keysinterface::{EntropySource, KeysInterface};
+       use crate::chain::keysinterface::EntropySource;
 
        #[test]
        fn test_notify_limits() {
@@ -7493,7 +7586,7 @@ mod tests {
                assert!(nodes[1].node.await_persistable_update_timeout(Duration::from_millis(1)));
                assert!(nodes[2].node.await_persistable_update_timeout(Duration::from_millis(1)));
 
-               let mut chan = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let mut chan = create_announced_chan_between_nodes(&nodes, 0, 1);
 
                // We check that the channel info nodes have doesn't change too early, even though we try
                // to connect messages with new values
@@ -7564,7 +7657,7 @@ mod tests {
                let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
                let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-               create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               create_announced_chan_between_nodes(&nodes, 0, 1);
 
                // First, send a partial MPP payment.
                let (route, our_payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(&nodes[0], nodes[1], 100_000);
@@ -7686,7 +7779,7 @@ mod tests {
                let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
                let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
                let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-               create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               create_announced_chan_between_nodes(&nodes, 0, 1);
                let scorer = test_utils::TestScorer::with_penalty(0);
                let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
 
@@ -7784,10 +7877,10 @@ mod tests {
 
                let payer_pubkey = nodes[0].node.get_our_node_id();
                let payee_pubkey = nodes[1].node.get_our_node_id();
-               nodes[0].node.peer_connected(&payee_pubkey, &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-               nodes[1].node.peer_connected(&payer_pubkey, &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
+               nodes[0].node.peer_connected(&payee_pubkey, &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }).unwrap();
+               nodes[1].node.peer_connected(&payer_pubkey, &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }).unwrap();
 
-               let _chan = create_chan_between_nodes(&nodes[0], &nodes[1], channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let _chan = create_chan_between_nodes(&nodes[0], &nodes[1]);
                let route_params = RouteParameters {
                        payment_params: PaymentParameters::for_keysend(payee_pubkey),
                        final_value_msat: 10_000,
@@ -7829,10 +7922,10 @@ mod tests {
 
                let payer_pubkey = nodes[0].node.get_our_node_id();
                let payee_pubkey = nodes[1].node.get_our_node_id();
-               nodes[0].node.peer_connected(&payee_pubkey, &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-               nodes[1].node.peer_connected(&payer_pubkey, &msgs::Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
+               nodes[0].node.peer_connected(&payee_pubkey, &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }).unwrap();
+               nodes[1].node.peer_connected(&payer_pubkey, &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }).unwrap();
 
-               let _chan = create_chan_between_nodes(&nodes[0], &nodes[1], channelmanager::provided_init_features(), channelmanager::provided_init_features());
+               let _chan = create_chan_between_nodes(&nodes[0], &nodes[1]);
                let route_params = RouteParameters {
                        payment_params: PaymentParameters::for_keysend(payee_pubkey),
                        final_value_msat: 10_000,
@@ -7872,10 +7965,10 @@ mod tests {
                let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
                let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 
-               let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1, channelmanager::provided_init_features(), channelmanager::provided_init_features()).0.contents.short_channel_id;
-               let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2, channelmanager::provided_init_features(), channelmanager::provided_init_features()).0.contents.short_channel_id;
-               let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3, channelmanager::provided_init_features(), channelmanager::provided_init_features()).0.contents.short_channel_id;
-               let chan_4_id = create_announced_chan_between_nodes(&nodes, 2, 3, channelmanager::provided_init_features(), channelmanager::provided_init_features()).0.contents.short_channel_id;
+               let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1).0.contents.short_channel_id;
+               let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2).0.contents.short_channel_id;
+               let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3).0.contents.short_channel_id;
+               let chan_4_id = create_announced_chan_between_nodes(&nodes, 2, 3).0.contents.short_channel_id;
 
                // Marshall an MPP route.
                let (mut route, payment_hash, _, _) = get_route_and_payment_hash!(&nodes[0], nodes[3], 100000);
@@ -7936,9 +8029,9 @@ mod tests {
 
                nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 1_000_000, 500_000_000, 42, None).unwrap();
                let open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
-               nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), channelmanager::provided_init_features(), &open_channel);
+               nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), &open_channel);
                let accept_channel = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
-               nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), channelmanager::provided_init_features(), &accept_channel);
+               nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), &accept_channel);
 
                let (temporary_channel_id, tx, _funding_output) = create_funding_transaction(&nodes[0], &nodes[1].node.get_our_node_id(), 1_000_000, 42);
                let channel_id = &tx.txid().into_inner();
@@ -7983,9 +8076,9 @@ mod tests {
                update_nodes_with_chan_announce(&nodes, 0, 1, &announcement, &nodes_0_update, &nodes_1_update);
 
                nodes[0].node.close_channel(channel_id, &nodes[1].node.get_our_node_id()).unwrap();
-               nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &channelmanager::provided_init_features(), &get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[1].node.get_our_node_id()));
+               nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[1].node.get_our_node_id()));
                let nodes_1_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
-               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &channelmanager::provided_init_features(), &nodes_1_shutdown);
+               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &nodes_1_shutdown);
 
                let closing_signed_node_0 = get_event_msg!(nodes[0], MessageSendEvent::SendClosingSigned, nodes[1].node.get_our_node_id());
                nodes[1].node.handle_closing_signed(&nodes[0].node.get_our_node_id(), &closing_signed_node_0);
@@ -8071,7 +8164,7 @@ mod tests {
                // creating dummy ones.
                nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 1_000_000, 500_000_000, 42, None).unwrap();
                let open_channel_msg = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
-               nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), channelmanager::provided_init_features(), &open_channel_msg);
+               nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), &open_channel_msg);
                let accept_channel_msg = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
 
                // Dummy values
@@ -8180,9 +8273,9 @@ mod tests {
                // Test the API functions and message handlers.
                check_not_connected_to_peer_error(nodes[0].node.create_channel(unkown_public_key, 1_000_000, 500_000_000, 42, None), unkown_public_key);
 
-               nodes[1].node.handle_open_channel(&unkown_public_key, channelmanager::provided_init_features(), &open_channel_msg);
+               nodes[1].node.handle_open_channel(&unkown_public_key, &open_channel_msg);
 
-               nodes[0].node.handle_accept_channel(&unkown_public_key, channelmanager::provided_init_features(), &accept_channel_msg);
+               nodes[0].node.handle_accept_channel(&unkown_public_key, &accept_channel_msg);
 
                check_unkown_peer_error(nodes[0].node.accept_inbound_channel(&open_channel_msg.temporary_channel_id, &unkown_public_key, 42), unkown_public_key);
 
@@ -8204,7 +8297,7 @@ mod tests {
 
                check_unkown_peer_error(nodes[0].node.update_channel_config(&unkown_public_key, &[channel_id], &ChannelConfig::default()), unkown_public_key);
 
-               nodes[0].node.handle_shutdown(&unkown_public_key, &channelmanager::provided_init_features(), &shutdown_msg);
+               nodes[0].node.handle_shutdown(&unkown_public_key, &shutdown_msg);
 
                nodes[1].node.handle_closing_signed(&unkown_public_key, &closing_signed_msg);
 
@@ -8224,13 +8317,49 @@ mod tests {
 
                nodes[1].node.handle_update_fee(&unkown_public_key, &update_fee_msg);
        }
+
+       #[cfg(anchors)]
+       #[test]
+       fn test_anchors_zero_fee_htlc_tx_fallback() {
+               // Tests that if both nodes support anchors, but the remote node does not want to accept
+               // anchor channels at the moment, an error it sent to the local node such that it can retry
+               // the channel without the anchors feature.
+               let chanmon_cfgs = create_chanmon_cfgs(2);
+               let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+               let mut anchors_config = test_default_channel_config();
+               anchors_config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx = true;
+               anchors_config.manually_accept_inbound_channels = true;
+               let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[Some(anchors_config.clone()), Some(anchors_config.clone())]);
+               let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+
+               nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100_000, 0, 0, None).unwrap();
+               let open_channel_msg = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
+               assert!(open_channel_msg.channel_type.as_ref().unwrap().supports_anchors_zero_fee_htlc_tx());
+
+               nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), &open_channel_msg);
+               let events = nodes[1].node.get_and_clear_pending_events();
+               match events[0] {
+                       Event::OpenChannelRequest { temporary_channel_id, .. } => {
+                               nodes[1].node.force_close_broadcasting_latest_txn(&temporary_channel_id, &nodes[0].node.get_our_node_id()).unwrap();
+                       }
+                       _ => panic!("Unexpected event"),
+               }
+
+               let error_msg = get_err_msg!(nodes[1], nodes[0].node.get_our_node_id());
+               nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &error_msg);
+
+               let open_channel_msg = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
+               assert!(!open_channel_msg.channel_type.unwrap().supports_anchors_zero_fee_htlc_tx());
+
+               check_closed_event!(nodes[1], 1, ClosureReason::HolderForceClosed);
+       }
 }
 
 #[cfg(all(any(test, feature = "_test_utils"), feature = "_bench_unstable"))]
 pub mod bench {
        use crate::chain::Listen;
        use crate::chain::chainmonitor::{ChainMonitor, Persist};
-       use crate::chain::keysinterface::{EntropySource, KeysManager, KeysInterface, InMemorySigner};
+       use crate::chain::keysinterface::{EntropySource, KeysManager, InMemorySigner};
        use crate::ln::channelmanager::{self, BestBlock, ChainParameters, ChannelManager, PaymentHash, PaymentPreimage, PaymentId};
        use crate::ln::functional_test_utils::*;
        use crate::ln::msgs::{ChannelMessageHandler, Init};
@@ -8253,7 +8382,7 @@ pub mod bench {
                        &'a ChainMonitor<InMemorySigner, &'a test_utils::TestChainSource,
                                &'a test_utils::TestBroadcaster, &'a test_utils::TestFeeEstimator,
                                &'a test_utils::TestLogger, &'a P>,
-                       &'a test_utils::TestBroadcaster, &'a KeysManager,
+                       &'a test_utils::TestBroadcaster, &'a KeysManager, &'a KeysManager, &'a KeysManager,
                        &'a test_utils::TestFeeEstimator, &'a test_utils::TestRouter<'a>,
                        &'a test_utils::TestLogger>,
        }
@@ -8282,7 +8411,7 @@ pub mod bench {
                let chain_monitor_a = ChainMonitor::new(None, &tx_broadcaster, &logger_a, &fee_estimator, &persister_a);
                let seed_a = [1u8; 32];
                let keys_manager_a = KeysManager::new(&seed_a, 42, 42);
-               let node_a = ChannelManager::new(&fee_estimator, &chain_monitor_a, &tx_broadcaster, &router, &logger_a, &keys_manager_a, config.clone(), ChainParameters {
+               let node_a = ChannelManager::new(&fee_estimator, &chain_monitor_a, &tx_broadcaster, &router, &logger_a, &keys_manager_a, &keys_manager_a, &keys_manager_a, config.clone(), ChainParameters {
                        network,
                        best_block: BestBlock::from_genesis(network),
                });
@@ -8292,17 +8421,17 @@ pub mod bench {
                let chain_monitor_b = ChainMonitor::new(None, &tx_broadcaster, &logger_a, &fee_estimator, &persister_b);
                let seed_b = [2u8; 32];
                let keys_manager_b = KeysManager::new(&seed_b, 42, 42);
-               let node_b = ChannelManager::new(&fee_estimator, &chain_monitor_b, &tx_broadcaster, &router, &logger_b, &keys_manager_b, config.clone(), ChainParameters {
+               let node_b = ChannelManager::new(&fee_estimator, &chain_monitor_b, &tx_broadcaster, &router, &logger_b, &keys_manager_b, &keys_manager_b, &keys_manager_b, config.clone(), ChainParameters {
                        network,
                        best_block: BestBlock::from_genesis(network),
                });
                let node_b_holder = NodeHolder { node: &node_b };
 
-               node_a.peer_connected(&node_b.get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
-               node_b.peer_connected(&node_a.get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
+               node_a.peer_connected(&node_b.get_our_node_id(), &Init { features: node_b.init_features(), remote_network_address: None }).unwrap();
+               node_b.peer_connected(&node_a.get_our_node_id(), &Init { features: node_a.init_features(), remote_network_address: None }).unwrap();
                node_a.create_channel(node_b.get_our_node_id(), 8_000_000, 100_000_000, 42, None).unwrap();
-               node_b.handle_open_channel(&node_a.get_our_node_id(), channelmanager::provided_init_features(), &get_event_msg!(node_a_holder, MessageSendEvent::SendOpenChannel, node_b.get_our_node_id()));
-               node_a.handle_accept_channel(&node_b.get_our_node_id(), channelmanager::provided_init_features(), &get_event_msg!(node_b_holder, MessageSendEvent::SendAcceptChannel, node_a.get_our_node_id()));
+               node_b.handle_open_channel(&node_a.get_our_node_id(), &get_event_msg!(node_a_holder, MessageSendEvent::SendOpenChannel, node_b.get_our_node_id()));
+               node_a.handle_accept_channel(&node_b.get_our_node_id(), &get_event_msg!(node_b_holder, MessageSendEvent::SendAcceptChannel, node_a.get_our_node_id()));
 
                let tx;
                if let Event::FundingGenerationReady { temporary_channel_id, output_script, .. } = get_event!(node_a_holder, Event::FundingGenerationReady) {
@@ -8364,7 +8493,7 @@ pub mod bench {
                        ($node_a: expr, $node_b: expr) => {
                                let usable_channels = $node_a.list_usable_channels();
                                let payment_params = PaymentParameters::from_node_id($node_b.get_our_node_id())
-                                       .with_features(channelmanager::provided_invoice_features());
+                                       .with_features($node_b.invoice_features());
                                let scorer = test_utils::TestScorer::with_penalty(0);
                                let seed = [3u8; 32];
                                let keys_manager = KeysManager::new(&seed, 42, 42);