Merge pull request #646 from naumenkogs/2020-06-router-mpp
[rust-lightning] / lightning / src / ln / functional_tests.rs
index eef89d1b413cd36704d7ec6a6957f586c00e729e..4a2f5d3778ce339739df0a99aa1c4625fae5faae 100644 (file)
@@ -15,7 +15,7 @@ use chain::Watch;
 use chain::channelmonitor;
 use chain::channelmonitor::{ChannelMonitor, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY};
 use chain::transaction::OutPoint;
-use chain::keysinterface::{ChannelKeys, KeysInterface, SpendableOutputDescriptor};
+use chain::keysinterface::{Sign, KeysInterface};
 use ln::channel::{COMMITMENT_TX_BASE_WEIGHT, COMMITMENT_TX_WEIGHT_PER_HTLC};
 use ln::channelmanager::{ChannelManager, ChannelManagerReadArgs, RAACommitmentOrder, PaymentPreimage, PaymentHash, PaymentSecret, PaymentSendFailure, BREAKDOWN_TIMEOUT};
 use ln::channel::{Channel, ChannelError};
@@ -24,22 +24,17 @@ use routing::router::{Route, RouteHop, get_route};
 use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
 use ln::msgs;
 use ln::msgs::{ChannelMessageHandler,RoutingMessageHandler,HTLCFailChannelUpdate, ErrorAction};
-use util::enforcing_trait_impls::EnforcingChannelKeys;
+use util::enforcing_trait_impls::EnforcingSigner;
 use util::{byte_utils, test_utils};
 use util::events::{Event, EventsProvider, MessageSendEvent, MessageSendEventsProvider};
 use util::errors::APIError;
-use util::ser::{Writeable, ReadableArgs, Readable};
+use util::ser::{Writeable, ReadableArgs};
 use util::config::UserConfig;
 
 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
-use bitcoin::hashes::HashEngine;
-use bitcoin::hash_types::{Txid, BlockHash, WPubkeyHash};
-use bitcoin::util::bip143;
-use bitcoin::util::address::Address;
-use bitcoin::util::bip32::{ChildNumber, ExtendedPubKey, ExtendedPrivKey};
+use bitcoin::hash_types::{Txid, BlockHash};
 use bitcoin::blockdata::block::{Block, BlockHeader};
-use bitcoin::blockdata::transaction::{Transaction, TxOut, TxIn, SigHashType, OutPoint as BitcoinOutPoint};
-use bitcoin::blockdata::script::{Builder, Script};
+use bitcoin::blockdata::script::Builder;
 use bitcoin::blockdata::opcodes;
 use bitcoin::blockdata::constants::genesis_block;
 use bitcoin::network::constants::Network;
@@ -54,12 +49,13 @@ use regex;
 
 use std::collections::{BTreeSet, HashMap, HashSet};
 use std::default::Default;
-use std::sync::{Arc, Mutex};
+use std::sync::Mutex;
 use std::sync::atomic::Ordering;
 use std::mem;
 
 use ln::functional_test_utils::*;
-use ln::chan_utils::PreCalculatedTxCreationKeys;
+use ln::chan_utils::CommitmentTransaction;
+use ln::msgs::OptionalField::Present;
 
 #[test]
 fn test_insane_channel_opens() {
@@ -72,7 +68,7 @@ fn test_insane_channel_opens() {
        // Instantiate channel parameters where we push the maximum msats given our
        // funding satoshis
        let channel_value_sat = 31337; // same as funding satoshis
-       let channel_reserve_satoshis = Channel::<EnforcingChannelKeys>::get_holder_selected_channel_reserve_satoshis(channel_value_sat);
+       let channel_reserve_satoshis = Channel::<EnforcingSigner>::get_holder_selected_channel_reserve_satoshis(channel_value_sat);
        let push_msat = (channel_value_sat - channel_reserve_satoshis) * 1000;
 
        // Have node0 initiate a channel to node1 with aforementioned parameters
@@ -837,9 +833,9 @@ fn pre_funding_lock_shutdown_test() {
 
        nodes[0].node.close_channel(&OutPoint { txid: tx.txid(), index: 0 }.to_channel_id()).unwrap();
        let node_0_shutdown = 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(), &node_0_shutdown);
+       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
        let node_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(), &node_1_shutdown);
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_1_shutdown);
 
        let node_0_closing_signed = 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(), &node_0_closing_signed);
@@ -867,9 +863,9 @@ fn updates_shutdown_wait() {
 
        nodes[0].node.close_channel(&chan_1.2).unwrap();
        let node_0_shutdown = 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(), &node_0_shutdown);
+       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
        let node_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(), &node_1_shutdown);
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_1_shutdown);
 
        assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
        assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
@@ -954,13 +950,13 @@ fn htlc_fail_async_shutdown() {
 
        nodes[1].node.close_channel(&chan_1.2).unwrap();
        let node_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(), &node_1_shutdown);
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_1_shutdown);
        let node_0_shutdown = get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[1].node.get_our_node_id());
 
        nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
        nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &updates.commitment_signed);
        check_added_monitors!(nodes[1], 1);
-       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &node_0_shutdown);
+       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
        commitment_signed_dance!(nodes[1], nodes[0], (), false, true, false);
 
        let updates_2 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
@@ -1022,10 +1018,10 @@ fn do_test_shutdown_rebroadcast(recv_count: u8) {
        nodes[1].node.close_channel(&chan_1.2).unwrap();
        let node_1_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
        if recv_count > 0 {
-               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &node_1_shutdown);
+               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_1_shutdown);
                let node_0_shutdown = get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[1].node.get_our_node_id());
                if recv_count > 1 {
-                       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &node_0_shutdown);
+                       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
                }
        }
 
@@ -1044,14 +1040,14 @@ fn do_test_shutdown_rebroadcast(recv_count: u8) {
        nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &node_1_reestablish);
        let node_0_2nd_shutdown = if recv_count > 0 {
                let node_0_2nd_shutdown = get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[1].node.get_our_node_id());
-               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &node_1_2nd_shutdown);
+               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_1_2nd_shutdown);
                node_0_2nd_shutdown
        } else {
                assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
-               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &node_1_2nd_shutdown);
+               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_1_2nd_shutdown);
                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(), &node_0_2nd_shutdown);
+       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_2nd_shutdown);
 
        assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
        assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
@@ -1111,10 +1107,10 @@ fn do_test_shutdown_rebroadcast(recv_count: u8) {
                let node_1_3rd_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
                assert!(node_1_3rd_shutdown == node_1_2nd_shutdown);
 
-               nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &node_0_3rd_shutdown);
+               nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_3rd_shutdown);
                assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 
-               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &node_1_3rd_shutdown);
+               nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_1_3rd_shutdown);
                let node_0_2nd_closing_signed = get_event_msg!(nodes[0], MessageSendEvent::SendClosingSigned, nodes[1].node.get_our_node_id());
                assert!(node_0_closing_signed == node_0_2nd_closing_signed);
 
@@ -1584,7 +1580,7 @@ fn test_fee_spike_violation_fails_htlc() {
                        let route = get_route(&nodes[0].node.get_our_node_id(), net_graph_msg_handler, &nodes.last().unwrap().node.get_our_node_id(), None, &Vec::new(), $recv_value, TEST_FINAL_CLTV, &logger).unwrap();
                        (route, payment_hash, payment_preimage)
                }}
-       };
+       }
 
        let (route, payment_hash, _) = get_route_and_payment_hash!(3460001);
        // Need to manually create the update_add_htlc message to go around the channel reserve check in send_htlc()
@@ -1615,98 +1611,58 @@ fn test_fee_spike_violation_fails_htlc() {
 
        const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
 
-       // Get the EnforcingChannelKeys for each channel, which will be used to (1) get the keys
+       // Get the EnforcingSigner for each channel, which will be used to (1) get the keys
        // needed to sign the new commitment tx and (2) sign the new commitment tx.
-       let (local_revocation_basepoint, local_htlc_basepoint, local_payment_point, local_secret, local_secret2) = {
+       let (local_revocation_basepoint, local_htlc_basepoint, local_secret, next_local_point) = {
                let chan_lock = nodes[0].node.channel_state.lock().unwrap();
                let local_chan = chan_lock.by_id.get(&chan.2).unwrap();
-               let chan_keys = local_chan.get_keys();
-               let pubkeys = chan_keys.pubkeys();
-               (pubkeys.revocation_basepoint, pubkeys.htlc_basepoint, pubkeys.payment_point,
-                chan_keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER), chan_keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER - 2))
+               let chan_signer = local_chan.get_signer();
+               let pubkeys = chan_signer.pubkeys();
+               (pubkeys.revocation_basepoint, pubkeys.htlc_basepoint,
+                chan_signer.release_commitment_secret(INITIAL_COMMITMENT_NUMBER),
+                chan_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - 2, &secp_ctx))
        };
-       let (remote_delayed_payment_basepoint, remote_htlc_basepoint, remote_payment_point, remote_secret1) = {
+       let (remote_delayed_payment_basepoint, remote_htlc_basepoint,remote_point) = {
                let chan_lock = nodes[1].node.channel_state.lock().unwrap();
                let remote_chan = chan_lock.by_id.get(&chan.2).unwrap();
-               let chan_keys = remote_chan.get_keys();
-               let pubkeys = chan_keys.pubkeys();
-               (pubkeys.delayed_payment_basepoint, pubkeys.htlc_basepoint, pubkeys.payment_point,
-                chan_keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER - 1))
+               let chan_signer = remote_chan.get_signer();
+               let pubkeys = chan_signer.pubkeys();
+               (pubkeys.delayed_payment_basepoint, pubkeys.htlc_basepoint,
+                chan_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - 1, &secp_ctx))
        };
 
        // Assemble the set of keys we can use for signatures for our commitment_signed message.
-       let commitment_secret = SecretKey::from_slice(&remote_secret1).unwrap();
-       let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &commitment_secret);
-       let commit_tx_keys = chan_utils::TxCreationKeys::derive_new(&secp_ctx, &per_commitment_point, &remote_delayed_payment_basepoint,
+       let commit_tx_keys = chan_utils::TxCreationKeys::derive_new(&secp_ctx, &remote_point, &remote_delayed_payment_basepoint,
                &remote_htlc_basepoint, &local_revocation_basepoint, &local_htlc_basepoint).unwrap();
 
        // Build the remote commitment transaction so we can sign it, and then later use the
        // signature for the commitment_signed message.
        let local_chan_balance = 1313;
-       let static_payment_pk = local_payment_point.serialize();
-       let remote_commit_tx_output = TxOut {
-                               script_pubkey: Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0)
-                                                            .push_slice(&WPubkeyHash::hash(&static_payment_pk)[..])
-                                                            .into_script(),
-               value: local_chan_balance as u64
-       };
-
-       let local_commit_tx_output = TxOut {
-               script_pubkey: chan_utils::get_revokeable_redeemscript(&commit_tx_keys.revocation_key,
-                                                                              BREAKDOWN_TIMEOUT,
-                                                                              &commit_tx_keys.broadcaster_delayed_payment_key).to_v0_p2wsh(),
-                               value: 95000,
-       };
 
        let accepted_htlc_info = chan_utils::HTLCOutputInCommitment {
                offered: false,
                amount_msat: 3460001,
                cltv_expiry: htlc_cltv,
-               payment_hash: payment_hash,
+               payment_hash,
                transaction_output_index: Some(1),
        };
 
-       let htlc_output = TxOut {
-               script_pubkey: chan_utils::get_htlc_redeemscript(&accepted_htlc_info, &commit_tx_keys).to_v0_p2wsh(),
-               value: 3460001 / 1000
-       };
-
-       let commit_tx_obscure_factor = {
-               let mut sha = Sha256::engine();
-               let remote_payment_point = &remote_payment_point.serialize();
-               sha.input(&local_payment_point.serialize());
-               sha.input(remote_payment_point);
-               let res = Sha256::from_engine(sha).into_inner();
-
-               ((res[26] as u64) << 5*8) |
-               ((res[27] as u64) << 4*8) |
-               ((res[28] as u64) << 3*8) |
-               ((res[29] as u64) << 2*8) |
-               ((res[30] as u64) << 1*8) |
-               ((res[31] as u64) << 0*8)
-       };
-       let commitment_number = 1;
-       let obscured_commitment_transaction_number = commit_tx_obscure_factor ^ commitment_number;
-       let lock_time = ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32);
-       let input = TxIn {
-               previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
-               script_sig: Script::new(),
-               sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
-               witness: Vec::new(),
-       };
+       let commitment_number = INITIAL_COMMITMENT_NUMBER - 1;
 
-       let commit_tx = Transaction {
-               version: 2,
-               lock_time,
-               input: vec![input],
-               output: vec![remote_commit_tx_output, htlc_output, local_commit_tx_output],
-       };
        let res = {
                let local_chan_lock = nodes[0].node.channel_state.lock().unwrap();
                let local_chan = local_chan_lock.by_id.get(&chan.2).unwrap();
-               let local_chan_keys = local_chan.get_keys();
-               let pre_commit_tx_keys = PreCalculatedTxCreationKeys::new(commit_tx_keys);
-               local_chan_keys.sign_counterparty_commitment(feerate_per_kw, &commit_tx, &pre_commit_tx_keys, &[&accepted_htlc_info], &secp_ctx).unwrap()
+               let local_chan_signer = local_chan.get_signer();
+               let commitment_tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
+                       commitment_number,
+                       95000,
+                       local_chan_balance,
+                       commit_tx_keys.clone(),
+                       feerate_per_kw,
+                       &mut vec![(accepted_htlc_info, ())],
+                       &local_chan.channel_transaction_parameters.as_counterparty_broadcastable()
+               );
+               local_chan_signer.sign_counterparty_commitment(&commitment_tx, &secp_ctx).unwrap()
        };
 
        let commit_signed_msg = msgs::CommitmentSigned {
@@ -1720,10 +1676,11 @@ fn test_fee_spike_violation_fails_htlc() {
        let _ = nodes[1].node.get_and_clear_pending_msg_events();
 
        // Send the RAA to nodes[1].
-       let per_commitment_secret = local_secret;
-       let next_secret = SecretKey::from_slice(&local_secret2).unwrap();
-       let next_per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &next_secret);
-       let raa_msg = msgs::RevokeAndACK{ channel_id: chan.2, per_commitment_secret, next_per_commitment_point};
+       let raa_msg = msgs::RevokeAndACK {
+               channel_id: chan.2,
+               per_commitment_secret: local_secret,
+               next_per_commitment_point: next_local_point
+       };
        nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &raa_msg);
 
        let events = nodes[1].node.get_and_clear_pending_msg_events();
@@ -1745,8 +1702,9 @@ fn test_fee_spike_violation_fails_htlc() {
 fn test_chan_reserve_violation_outbound_htlc_inbound_chan() {
        let mut chanmon_cfgs = create_chanmon_cfgs(2);
        // Set the fee rate for the channel very high, to the point where the fundee
-       // sending any amount would result in a channel reserve violation. In this test
-       // we check that we would be prevented from sending an HTLC in this situation.
+       // sending any above-dust amount would result in a channel reserve violation.
+       // In this test we check that we would be prevented from sending an HTLC in
+       // this situation.
        chanmon_cfgs[0].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 6000 };
        chanmon_cfgs[1].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 6000 };
        let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
@@ -1762,9 +1720,9 @@ fn test_chan_reserve_violation_outbound_htlc_inbound_chan() {
                        let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &nodes.first().unwrap().node.get_our_node_id(), None, &Vec::new(), $recv_value, TEST_FINAL_CLTV, &logger).unwrap();
                        (route, payment_hash, payment_preimage)
                }}
-       };
+       }
 
-       let (route, our_payment_hash, _) = get_route_and_payment_hash!(1000);
+       let (route, our_payment_hash, _) = get_route_and_payment_hash!(4843000);
        unwrap_send_err!(nodes[1].node.send_payment(&route, our_payment_hash, &None), true, APIError::ChannelUnavailable { ref err },
                assert_eq!(err, "Cannot send value that would put counterparty balance under holder-announced channel reserve value"));
        assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
@@ -1794,7 +1752,7 @@ fn test_chan_reserve_violation_inbound_htlc_outbound_channel() {
                        let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &nodes.first().unwrap().node.get_our_node_id(), None, &Vec::new(), $recv_value, TEST_FINAL_CLTV, &logger).unwrap();
                        (route, payment_hash, payment_preimage)
                }}
-       };
+       }
 
        let (route, payment_hash, _) = get_route_and_payment_hash!(1000);
        // Need to manually create the update_add_htlc message to go around the channel reserve check in send_htlc()
@@ -1822,6 +1780,57 @@ fn test_chan_reserve_violation_inbound_htlc_outbound_channel() {
        check_added_monitors!(nodes[0], 1);
 }
 
+#[test]
+fn test_chan_reserve_dust_inbound_htlcs_outbound_chan() {
+       // Test that if we receive many dust HTLCs over an outbound channel, they don't count when
+       // calculating our commitment transaction fee (this was previously broken).
+       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None, None]);
+       let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+
+       // Set nodes[0]'s balance such that they will consider any above-dust received HTLC to be a
+       // channel reserve violation (so their balance is channel reserve (1000 sats) + commitment
+       // transaction fee with 0 HTLCs (183 sats)).
+       create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 98817000, InitFeatures::known(), InitFeatures::known());
+
+       let dust_amt = 546000; // Dust amount
+       // In the previous code, routing this dust payment would cause nodes[0] to perceive a channel
+       // reserve violation even though it's a dust HTLC and therefore shouldn't count towards the
+       // commitment transaction fee.
+       let (_, _) = route_payment(&nodes[1], &[&nodes[0]], dust_amt);
+}
+
+#[test]
+fn test_chan_reserve_dust_inbound_htlcs_inbound_chan() {
+       // Test that if we receive many dust HTLCs over an inbound channel, they don't count when
+       // calculating our counterparty's commitment transaction fee (this was previously broken).
+       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None, None]);
+       let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+       create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 98000000, InitFeatures::known(), InitFeatures::known());
+
+       let payment_amt = 46000; // Dust amount
+       // In the previous code, these first four payments would succeed.
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+
+       // Then these next 5 would be interpreted by nodes[1] as violating the fee spike buffer.
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+
+       // And this last payment previously resulted in nodes[1] closing on its inbound-channel
+       // counterparty, because it counted all the previous dust HTLCs against nodes[0]'s commitment
+       // transaction fee and therefore perceived this next payment as a channel reserve violation.
+       let (_, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
+}
+
 #[test]
 fn test_chan_reserve_violation_inbound_htlc_inbound_chan() {
        let chanmon_cfgs = create_chanmon_cfgs(3);
@@ -1839,7 +1848,7 @@ fn test_chan_reserve_violation_inbound_htlc_inbound_chan() {
                        let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &nodes.last().unwrap().node.get_our_node_id(), None, &Vec::new(), $recv_value, TEST_FINAL_CLTV, &logger).unwrap();
                        (route, payment_hash, payment_preimage)
                }}
-       };
+       }
 
        let feemsat = 239;
        let total_routing_fee_msat = (nodes.len() - 2) as u64 * feemsat;
@@ -1940,7 +1949,7 @@ fn test_channel_reserve_holding_cell_htlcs() {
                        let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &nodes.last().unwrap().node.get_our_node_id(), None, &Vec::new(), $recv_value, TEST_FINAL_CLTV, &logger).unwrap();
                        (route, payment_hash, payment_preimage)
                }}
-       };
+       }
 
        macro_rules! expect_forward {
                ($node: expr) => {{
@@ -2134,23 +2143,6 @@ fn test_channel_reserve_holding_cell_htlcs() {
 
        let commit_tx_fee_0_htlcs = 2*commit_tx_fee_msat(feerate, 1);
        let recv_value_3 = commit_tx_fee_2_htlcs - commit_tx_fee_0_htlcs - total_fee_msat;
-       {
-               let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_3 + 1);
-               let err = nodes[0].node.send_payment(&route, our_payment_hash, &None).err().unwrap();
-               match err {
-                       PaymentSendFailure::AllFailedRetrySafe(ref fails) => {
-                               match &fails[0] {
-                                       &APIError::ChannelUnavailable{ref err} =>
-                                               assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)),
-                                       _ => panic!("Unexpected error variant"),
-                               }
-                       },
-                       _ => panic!("Unexpected error variant"),
-               }
-               assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
-               nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send value that would put our balance under counterparty-announced channel reserve value".to_string(), 3);
-       }
-
        send_payment(&nodes[0], &vec![&nodes[1], &nodes[2]][..], recv_value_3, recv_value_3);
 
        let commit_tx_fee_1_htlc = 2*commit_tx_fee_msat(feerate, 1 + 1);
@@ -2511,7 +2503,9 @@ fn test_justice_tx() {
        bob_config.peer_channel_config_limits.force_announced_channel_preference = false;
        bob_config.own_channel_config.our_to_self_delay = 6 * 24 * 3;
        let user_cfgs = [Some(alice_config), Some(bob_config)];
-       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
+       chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
        let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
        let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &user_cfgs);
        let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -2641,7 +2635,8 @@ fn revoked_output_claim() {
 #[test]
 fn claim_htlc_outputs_shared_tx() {
        // Node revoked old state, htlcs haven't time out yet, claim them in shared justice tx
-       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
        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);
@@ -2711,7 +2706,8 @@ fn claim_htlc_outputs_shared_tx() {
 #[test]
 fn claim_htlc_outputs_single_tx() {
        // Node revoked old state, htlcs have timed out, claim each of them in separated justice tx
-       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
        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);
@@ -3437,7 +3433,7 @@ fn test_htlc_ignore_latest_remote_commitment() {
        create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 
        route_payment(&nodes[0], &[&nodes[1]], 10000000);
-       nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id);
+       nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
        check_closed_broadcast!(nodes[0], false);
        check_added_monitors!(nodes[0], 1);
 
@@ -3498,7 +3494,7 @@ fn test_force_close_fail_back() {
        // state or updated nodes[1]' state. Now force-close and broadcast that commitment/HTLC
        // transaction and ensure nodes[1] doesn't fail-backwards (this was originally a bug!).
 
-       nodes[2].node.force_close_channel(&payment_event.commitment_msg.channel_id);
+       nodes[2].node.force_close_channel(&payment_event.commitment_msg.channel_id).unwrap();
        check_closed_broadcast!(nodes[2], false);
        check_added_monitors!(nodes[2], 1);
        let tx = {
@@ -3522,8 +3518,8 @@ fn test_force_close_fail_back() {
 
        // Now check that if we add the preimage to ChannelMonitor it broadcasts our HTLC-Success..
        {
-               let mut monitors = nodes[2].chain_monitor.chain_monitor.monitors.lock().unwrap();
-               monitors.get_mut(&OutPoint{ txid: Txid::from_slice(&payment_event.commitment_msg.channel_id[..]).unwrap(), index: 0 }).unwrap()
+               let mut monitors = nodes[2].chain_monitor.chain_monitor.monitors.read().unwrap();
+               monitors.get(&OutPoint{ txid: Txid::from_slice(&payment_event.commitment_msg.channel_id[..]).unwrap(), index: 0 }).unwrap()
                        .provide_payment_preimage(&our_payment_hash, &our_payment_preimage, &node_cfgs[2].tx_broadcaster, &node_cfgs[2].fee_estimator, &&logger);
        }
        connect_block(&nodes[2], &block, 1);
@@ -4242,8 +4238,8 @@ fn test_invalid_channel_announcement() {
 
        nodes[0].net_graph_msg_handler.handle_htlc_fail_channel_update(&msgs::HTLCFailChannelUpdate::ChannelClosed { short_channel_id : as_chan.get_short_channel_id().unwrap(), is_permanent: false } );
 
-       let as_bitcoin_key = as_chan.get_keys().inner.holder_channel_pubkeys.funding_pubkey;
-       let bs_bitcoin_key = bs_chan.get_keys().inner.holder_channel_pubkeys.funding_pubkey;
+       let as_bitcoin_key = as_chan.get_signer().inner.holder_channel_pubkeys.funding_pubkey;
+       let bs_bitcoin_key = bs_chan.get_signer().inner.holder_channel_pubkeys.funding_pubkey;
 
        let as_network_key = nodes[0].node.get_our_node_id();
        let bs_network_key = nodes[1].node.get_our_node_id();
@@ -4270,8 +4266,8 @@ fn test_invalid_channel_announcement() {
        macro_rules! sign_msg {
                ($unsigned_msg: expr) => {
                        let msghash = Message::from_slice(&Sha256dHash::hash(&$unsigned_msg.encode()[..])[..]).unwrap();
-                       let as_bitcoin_sig = secp_ctx.sign(&msghash, &as_chan.get_keys().inner.funding_key);
-                       let bs_bitcoin_sig = secp_ctx.sign(&msghash, &bs_chan.get_keys().inner.funding_key);
+                       let as_bitcoin_sig = secp_ctx.sign(&msghash, &as_chan.get_signer().inner.funding_key);
+                       let bs_bitcoin_sig = secp_ctx.sign(&msghash, &bs_chan.get_signer().inner.funding_key);
                        let as_node_sig = secp_ctx.sign(&msghash, &nodes[0].keys_manager.get_node_secret());
                        let bs_node_sig = secp_ctx.sign(&msghash, &nodes[1].keys_manager.get_node_secret());
                        chan_announcement = msgs::ChannelAnnouncement {
@@ -4310,8 +4306,7 @@ fn test_no_txn_manager_serialize_deserialize() {
        let fee_estimator: test_utils::TestFeeEstimator;
        let persister: test_utils::TestPersister;
        let new_chain_monitor: test_utils::TestChainMonitor;
-       let keys_manager: test_utils::TestKeysInterface;
-       let nodes_0_deserialized: ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
+       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
        let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 
        let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001, InitFeatures::known(), InitFeatures::known());
@@ -4320,26 +4315,27 @@ fn test_no_txn_manager_serialize_deserialize() {
 
        let nodes_0_serialized = nodes[0].node.encode();
        let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap().iter().next().unwrap().1.serialize_for_disk(&mut chan_0_monitor_serialized).unwrap();
+       nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
 
        logger = test_utils::TestLogger::new();
        fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 253 };
        persister = test_utils::TestPersister::new();
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister);
+       let keys_manager = &chanmon_cfgs[0].keys_manager;
+       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
        nodes[0].chain_monitor = &new_chain_monitor;
        let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut chan_0_monitor_read).unwrap();
+       let (_, mut chan_0_monitor) = <(Option<BlockHash>, ChannelMonitor<EnforcingSigner>)>::read(
+               &mut chan_0_monitor_read, keys_manager).unwrap();
        assert!(chan_0_monitor_read.is_empty());
 
        let mut nodes_0_read = &nodes_0_serialized[..];
        let config = UserConfig::default();
-       keys_manager = test_utils::TestKeysInterface::new(&nodes[0].node_seed, Network::Testnet);
        let (_, nodes_0_deserialized_tmp) = {
                let mut channel_monitors = HashMap::new();
                channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               <(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+               <(Option<BlockHash>, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
                        default_config: config,
-                       keys_manager: &keys_manager,
+                       keys_manager,
                        fee_estimator: &fee_estimator,
                        chain_monitor: nodes[0].chain_monitor,
                        tx_broadcaster: nodes[0].tx_broadcaster.clone(),
@@ -4386,8 +4382,7 @@ fn test_manager_serialize_deserialize_events() {
        let persister: test_utils::TestPersister;
        let logger: test_utils::TestLogger;
        let new_chain_monitor: test_utils::TestChainMonitor;
-       let keys_manager: test_utils::TestKeysInterface;
-       let nodes_0_deserialized: ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
+       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
        let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 
        // Start creating a channel, but stop right before broadcasting the event message FundingBroadcastSafe
@@ -4395,8 +4390,8 @@ fn test_manager_serialize_deserialize_events() {
        let push_msat = 10001;
        let a_flags = InitFeatures::known();
        let b_flags = InitFeatures::known();
-       let node_a = nodes.pop().unwrap();
-       let node_b = nodes.pop().unwrap();
+       let node_a = nodes.remove(0);
+       let node_b = nodes.remove(0);
        node_a.node.create_channel(node_b.node.get_our_node_id(), channel_value, push_msat, 42, None).unwrap();
        node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), a_flags, &get_event_msg!(node_a, MessageSendEvent::SendOpenChannel, node_b.node.get_our_node_id()));
        node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), b_flags, &get_event_msg!(node_b, MessageSendEvent::SendAcceptChannel, node_a.node.get_our_node_id()));
@@ -4429,26 +4424,27 @@ fn test_manager_serialize_deserialize_events() {
        // Start the de/seriailization process mid-channel creation to check that the channel manager will hold onto events that are serialized
        let nodes_0_serialized = nodes[0].node.encode();
        let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap().iter().next().unwrap().1.serialize_for_disk(&mut chan_0_monitor_serialized).unwrap();
+       nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
 
        fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 253 };
        logger = test_utils::TestLogger::new();
        persister = test_utils::TestPersister::new();
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister);
+       let keys_manager = &chanmon_cfgs[0].keys_manager;
+       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
        nodes[0].chain_monitor = &new_chain_monitor;
        let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut chan_0_monitor_read).unwrap();
+       let (_, mut chan_0_monitor) = <(Option<BlockHash>, ChannelMonitor<EnforcingSigner>)>::read(
+               &mut chan_0_monitor_read, keys_manager).unwrap();
        assert!(chan_0_monitor_read.is_empty());
 
        let mut nodes_0_read = &nodes_0_serialized[..];
        let config = UserConfig::default();
-       keys_manager = test_utils::TestKeysInterface::new(&nodes[0].node_seed, Network::Testnet);
        let (_, nodes_0_deserialized_tmp) = {
                let mut channel_monitors = HashMap::new();
                channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               <(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+               <(Option<BlockHash>, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
                        default_config: config,
-                       keys_manager: &keys_manager,
+                       keys_manager,
                        fee_estimator: &fee_estimator,
                        chain_monitor: nodes[0].chain_monitor,
                        tx_broadcaster: nodes[0].tx_broadcaster.clone(),
@@ -4509,8 +4505,7 @@ fn test_simple_manager_serialize_deserialize() {
        let fee_estimator: test_utils::TestFeeEstimator;
        let persister: test_utils::TestPersister;
        let new_chain_monitor: test_utils::TestChainMonitor;
-       let keys_manager: test_utils::TestKeysInterface;
-       let nodes_0_deserialized: ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
+       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
        let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
        create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 
@@ -4521,25 +4516,26 @@ fn test_simple_manager_serialize_deserialize() {
 
        let nodes_0_serialized = nodes[0].node.encode();
        let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
-       nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap().iter().next().unwrap().1.serialize_for_disk(&mut chan_0_monitor_serialized).unwrap();
+       nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
 
        logger = test_utils::TestLogger::new();
        fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 253 };
        persister = test_utils::TestPersister::new();
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister);
+       let keys_manager = &chanmon_cfgs[0].keys_manager;
+       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
        nodes[0].chain_monitor = &new_chain_monitor;
        let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-       let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut chan_0_monitor_read).unwrap();
+       let (_, mut chan_0_monitor) = <(Option<BlockHash>, ChannelMonitor<EnforcingSigner>)>::read(
+               &mut chan_0_monitor_read, keys_manager).unwrap();
        assert!(chan_0_monitor_read.is_empty());
 
        let mut nodes_0_read = &nodes_0_serialized[..];
-       keys_manager = test_utils::TestKeysInterface::new(&nodes[0].node_seed, Network::Testnet);
        let (_, nodes_0_deserialized_tmp) = {
                let mut channel_monitors = HashMap::new();
                channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
-               <(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+               <(Option<BlockHash>, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
                        default_config: UserConfig::default(),
-                       keys_manager: &keys_manager,
+                       keys_manager,
                        fee_estimator: &fee_estimator,
                        chain_monitor: nodes[0].chain_monitor,
                        tx_broadcaster: nodes[0].tx_broadcaster.clone(),
@@ -4570,17 +4566,16 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
        let fee_estimator: test_utils::TestFeeEstimator;
        let persister: test_utils::TestPersister;
        let new_chain_monitor: test_utils::TestChainMonitor;
-       let keys_manager: test_utils::TestKeysInterface;
-       let nodes_0_deserialized: ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
+       let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
        let mut nodes = create_network(4, &node_cfgs, &node_chanmgrs);
        create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
        create_announced_chan_between_nodes(&nodes, 2, 0, InitFeatures::known(), InitFeatures::known());
        let (_, _, channel_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 3, InitFeatures::known(), InitFeatures::known());
 
        let mut node_0_stale_monitors_serialized = Vec::new();
-       for monitor in nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap().iter() {
+       for monitor in nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter() {
                let mut writer = test_utils::TestVecWriter(Vec::new());
-               monitor.1.serialize_for_disk(&mut writer).unwrap();
+               monitor.1.write(&mut writer).unwrap();
                node_0_stale_monitors_serialized.push(writer.0);
        }
 
@@ -4597,22 +4592,24 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
        // Now the ChannelMonitor (which is now out-of-sync with ChannelManager for channel w/
        // nodes[3])
        let mut node_0_monitors_serialized = Vec::new();
-       for monitor in nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap().iter() {
+       for monitor in nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter() {
                let mut writer = test_utils::TestVecWriter(Vec::new());
-               monitor.1.serialize_for_disk(&mut writer).unwrap();
+               monitor.1.write(&mut writer).unwrap();
                node_0_monitors_serialized.push(writer.0);
        }
 
        logger = test_utils::TestLogger::new();
        fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 253 };
        persister = test_utils::TestPersister::new();
-       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister);
+       let keys_manager = &chanmon_cfgs[0].keys_manager;
+       new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
        nodes[0].chain_monitor = &new_chain_monitor;
 
+
        let mut node_0_stale_monitors = Vec::new();
        for serialized in node_0_stale_monitors_serialized.iter() {
                let mut read = &serialized[..];
-               let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut read).unwrap();
+               let (_, monitor) = <(Option<BlockHash>, ChannelMonitor<EnforcingSigner>)>::read(&mut read, keys_manager).unwrap();
                assert!(read.is_empty());
                node_0_stale_monitors.push(monitor);
        }
@@ -4620,18 +4617,16 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
        let mut node_0_monitors = Vec::new();
        for serialized in node_0_monitors_serialized.iter() {
                let mut read = &serialized[..];
-               let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut read).unwrap();
+               let (_, monitor) = <(Option<BlockHash>, ChannelMonitor<EnforcingSigner>)>::read(&mut read, keys_manager).unwrap();
                assert!(read.is_empty());
                node_0_monitors.push(monitor);
        }
 
-       keys_manager = test_utils::TestKeysInterface::new(&nodes[0].node_seed, Network::Testnet);
-
        let mut nodes_0_read = &nodes_0_serialized[..];
        if let Err(msgs::DecodeError::InvalidValue) =
-               <(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+               <(Option<BlockHash>, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
                default_config: UserConfig::default(),
-               keys_manager: &keys_manager,
+               keys_manager,
                fee_estimator: &fee_estimator,
                chain_monitor: nodes[0].chain_monitor,
                tx_broadcaster: nodes[0].tx_broadcaster.clone(),
@@ -4643,9 +4638,9 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
 
        let mut nodes_0_read = &nodes_0_serialized[..];
        let (_, nodes_0_deserialized_tmp) =
-               <(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+               <(Option<BlockHash>, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
                default_config: UserConfig::default(),
-               keys_manager: &keys_manager,
+               keys_manager,
                fee_estimator: &fee_estimator,
                chain_monitor: nodes[0].chain_monitor,
                tx_broadcaster: nodes[0].tx_broadcaster.clone(),
@@ -4693,120 +4688,26 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
 macro_rules! check_spendable_outputs {
        ($node: expr, $der_idx: expr, $keysinterface: expr, $chan_value: expr) => {
                {
-                       let events = $node.chain_monitor.chain_monitor.get_and_clear_pending_events();
+                       let mut events = $node.chain_monitor.chain_monitor.get_and_clear_pending_events();
                        let mut txn = Vec::new();
-                       for event in events {
+                       let mut all_outputs = Vec::new();
+                       let secp_ctx = Secp256k1::new();
+                       for event in events.drain(..) {
                                match event {
-                                       Event::SpendableOutputs { ref outputs } => {
-                                               for outp in outputs {
-                                                       match *outp {
-                                                               SpendableOutputDescriptor::StaticOutputCounterpartyPayment { ref outpoint, ref output, ref key_derivation_params } => {
-                                                                       let input = TxIn {
-                                                                               previous_output: outpoint.into_bitcoin_outpoint(),
-                                                                               script_sig: Script::new(),
-                                                                               sequence: 0,
-                                                                               witness: Vec::new(),
-                                                                       };
-                                                                       let outp = TxOut {
-                                                                               script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
-                                                                               value: output.value,
-                                                                       };
-                                                                       let mut spend_tx = Transaction {
-                                                                               version: 2,
-                                                                               lock_time: 0,
-                                                                               input: vec![input],
-                                                                               output: vec![outp],
-                                                                       };
-                                                                       spend_tx.output[0].value -= (spend_tx.get_weight() + 2 + 1 + 73 + 35 + 3) as u64 / 4; // (Max weight + 3 (to round up)) / 4
-                                                                       let secp_ctx = Secp256k1::new();
-                                                                       let keys = $keysinterface.derive_channel_keys($chan_value, key_derivation_params.0, key_derivation_params.1);
-                                                                       let remotepubkey = keys.pubkeys().payment_point;
-                                                                       let witness_script = Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: remotepubkey}, Network::Testnet).script_pubkey();
-                                                                       let sighash = Message::from_slice(&bip143::SigHashCache::new(&spend_tx).signature_hash(0, &witness_script, output.value, SigHashType::All)[..]).unwrap();
-                                                                       let remotesig = secp_ctx.sign(&sighash, &keys.inner.payment_key);
-                                                                       spend_tx.input[0].witness.push(remotesig.serialize_der().to_vec());
-                                                                       spend_tx.input[0].witness[0].push(SigHashType::All as u8);
-                                                                       spend_tx.input[0].witness.push(remotepubkey.serialize().to_vec());
-                                                                       txn.push(spend_tx);
-                                                               },
-                                                               SpendableOutputDescriptor::DynamicOutputP2WSH { ref outpoint, ref per_commitment_point, ref to_self_delay, ref output, ref key_derivation_params, ref revocation_pubkey } => {
-                                                                       let input = TxIn {
-                                                                               previous_output: outpoint.into_bitcoin_outpoint(),
-                                                                               script_sig: Script::new(),
-                                                                               sequence: *to_self_delay as u32,
-                                                                               witness: Vec::new(),
-                                                                       };
-                                                                       let outp = TxOut {
-                                                                               script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
-                                                                               value: output.value,
-                                                                       };
-                                                                       let mut spend_tx = Transaction {
-                                                                               version: 2,
-                                                                               lock_time: 0,
-                                                                               input: vec![input],
-                                                                               output: vec![outp],
-                                                                       };
-                                                                       let secp_ctx = Secp256k1::new();
-                                                                       let keys = $keysinterface.derive_channel_keys($chan_value, key_derivation_params.0, key_derivation_params.1);
-                                                                       if let Ok(delayed_payment_key) = chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &keys.inner.delayed_payment_base_key) {
-
-                                                                               let delayed_payment_pubkey = PublicKey::from_secret_key(&secp_ctx, &delayed_payment_key);
-                                                                               let witness_script = chan_utils::get_revokeable_redeemscript(revocation_pubkey, *to_self_delay, &delayed_payment_pubkey);
-                                                                               spend_tx.output[0].value -= (spend_tx.get_weight() + 2 + 1 + 73 + 1 + witness_script.len() + 1 + 3) as u64 / 4; // (Max weight + 3 (to round up)) / 4
-                                                                               let sighash = Message::from_slice(&bip143::SigHashCache::new(&spend_tx).signature_hash(0, &witness_script, output.value, SigHashType::All)[..]).unwrap();
-                                                                               let local_delayedsig = secp_ctx.sign(&sighash, &delayed_payment_key);
-                                                                               spend_tx.input[0].witness.push(local_delayedsig.serialize_der().to_vec());
-                                                                               spend_tx.input[0].witness[0].push(SigHashType::All as u8);
-                                                                               spend_tx.input[0].witness.push(vec!()); //MINIMALIF
-                                                                               spend_tx.input[0].witness.push(witness_script.clone().into_bytes());
-                                                                       } else { panic!() }
-                                                                       txn.push(spend_tx);
-                                                               },
-                                                               SpendableOutputDescriptor::StaticOutput { ref outpoint, ref output } => {
-                                                                       let secp_ctx = Secp256k1::new();
-                                                                       let input = TxIn {
-                                                                               previous_output: outpoint.into_bitcoin_outpoint(),
-                                                                               script_sig: Script::new(),
-                                                                               sequence: 0,
-                                                                               witness: Vec::new(),
-                                                                       };
-                                                                       let outp = TxOut {
-                                                                               script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
-                                                                               value: output.value,
-                                                                       };
-                                                                       let mut spend_tx = Transaction {
-                                                                               version: 2,
-                                                                               lock_time: 0,
-                                                                               input: vec![input],
-                                                                               output: vec![outp.clone()],
-                                                                       };
-                                                                       spend_tx.output[0].value -= (spend_tx.get_weight() + 2 + 1 + 73 + 35 + 3) as u64 / 4; // (Max weight + 3 (to round up)) / 4
-                                                                       let secret = {
-                                                                               match ExtendedPrivKey::new_master(Network::Testnet, &$node.node_seed) {
-                                                                                       Ok(master_key) => {
-                                                                                               match master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx($der_idx).expect("key space exhausted")) {
-                                                                                                       Ok(key) => key,
-                                                                                                       Err(_) => panic!("Your RNG is busted"),
-                                                                                               }
-                                                                                       }
-                                                                                       Err(_) => panic!("Your rng is busted"),
-                                                                               }
-                                                                       };
-                                                                       let pubkey = ExtendedPubKey::from_private(&secp_ctx, &secret).public_key;
-                                                                       let witness_script = Address::p2pkh(&pubkey, Network::Testnet).script_pubkey();
-                                                                       let sighash = Message::from_slice(&bip143::SigHashCache::new(&spend_tx).signature_hash(0, &witness_script, output.value, SigHashType::All)[..]).unwrap();
-                                                                       let sig = secp_ctx.sign(&sighash, &secret.private_key.key);
-                                                                       spend_tx.input[0].witness.push(sig.serialize_der().to_vec());
-                                                                       spend_tx.input[0].witness[0].push(SigHashType::All as u8);
-                                                                       spend_tx.input[0].witness.push(pubkey.key.serialize().to_vec());
-                                                                       txn.push(spend_tx);
-                                                               },
-                                                       }
+                                       Event::SpendableOutputs { mut outputs } => {
+                                               for outp in outputs.drain(..) {
+                                                       txn.push($keysinterface.backing.spend_spendable_outputs(&[&outp], Vec::new(), Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(), 253, &secp_ctx).unwrap());
+                                                       all_outputs.push(outp);
                                                }
                                        },
                                        _ => panic!("Unexpected event"),
                                };
                        }
+                       if all_outputs.len() > 1 {
+                               if let Ok(tx) = $keysinterface.backing.spend_spendable_outputs(&all_outputs.iter().map(|a| a).collect::<Vec<_>>(), Vec::new(), Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(), 253, &secp_ctx) {
+                                       txn.push(tx);
+                               }
+                       }
                        txn
                }
        }
@@ -4821,7 +4722,7 @@ fn test_claim_sizeable_push_msat() {
        let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 
        let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 99000000, InitFeatures::known(), InitFeatures::known());
-       nodes[1].node.force_close_channel(&chan.2);
+       nodes[1].node.force_close_channel(&chan.2).unwrap();
        check_closed_broadcast!(nodes[1], false);
        check_added_monitors!(nodes[1], 1);
        let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
@@ -4848,7 +4749,7 @@ fn test_claim_on_remote_sizeable_push_msat() {
        let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 
        let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 99000000, InitFeatures::known(), InitFeatures::known());
-       nodes[0].node.force_close_channel(&chan.2);
+       nodes[0].node.force_close_channel(&chan.2).unwrap();
        check_closed_broadcast!(nodes[0], false);
        check_added_monitors!(nodes[0], 1);
 
@@ -4896,9 +4797,10 @@ fn test_claim_on_remote_revoked_sizeable_push_msat() {
        connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1, 1, true, header.block_hash());
 
        let spend_txn = check_spendable_outputs!(nodes[1], 1, node_cfgs[1].keys_manager, 100000);
-       assert_eq!(spend_txn.len(), 2);
+       assert_eq!(spend_txn.len(), 3);
        check_spends!(spend_txn[0], revoked_local_txn[0]); // to_remote output on revoked remote commitment_tx
        check_spends!(spend_txn[1], node_txn[0]);
+       check_spends!(spend_txn[2], revoked_local_txn[0], node_txn[0]); // Both outputs
 }
 
 #[test]
@@ -4993,8 +4895,10 @@ fn test_static_spendable_outputs_timeout_tx() {
        expect_payment_failed!(nodes[1], our_payment_hash, true);
 
        let spend_txn = check_spendable_outputs!(nodes[1], 1, node_cfgs[1].keys_manager, 100000);
-       assert_eq!(spend_txn.len(), 2); // SpendableOutput: remote_commitment_tx.to_remote, timeout_tx.output
+       assert_eq!(spend_txn.len(), 3); // SpendableOutput: remote_commitment_tx.to_remote, timeout_tx.output
+       check_spends!(spend_txn[0], commitment_tx[0]);
        check_spends!(spend_txn[1], node_txn[0]);
+       check_spends!(spend_txn[2], node_txn[0], commitment_tx[0]); // All outputs
 }
 
 #[test]
@@ -5035,7 +4939,8 @@ fn test_static_spendable_outputs_justice_tx_revoked_commitment_tx() {
 
 #[test]
 fn test_static_spendable_outputs_justice_tx_revoked_htlc_timeout_tx() {
-       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
        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);
@@ -5101,7 +5006,8 @@ fn test_static_spendable_outputs_justice_tx_revoked_htlc_timeout_tx() {
 
 #[test]
 fn test_static_spendable_outputs_justice_tx_revoked_htlc_success_tx() {
-       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
        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);
@@ -5169,11 +5075,12 @@ fn test_static_spendable_outputs_justice_tx_revoked_htlc_success_tx() {
 
        // Check A's ChannelMonitor was able to generate the right spendable output descriptor
        let spend_txn = check_spendable_outputs!(nodes[0], 1, node_cfgs[0].keys_manager, 100000);
-       assert_eq!(spend_txn.len(), 2);
+       assert_eq!(spend_txn.len(), 3);
        assert_eq!(spend_txn[0].input.len(), 1);
        check_spends!(spend_txn[0], revoked_local_txn[0]); // spending to_remote output from revoked local tx
        assert_ne!(spend_txn[0].input[0].previous_output, revoked_htlc_txn[0].input[0].previous_output);
        check_spends!(spend_txn[1], node_txn[1]); // spending justice tx output on the htlc success tx
+       check_spends!(spend_txn[2], revoked_local_txn[0], node_txn[1]); // Both outputs
 }
 
 #[test]
@@ -5406,6 +5313,7 @@ fn test_dynamic_spendable_outputs_local_htlc_success_tx() {
 
        let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 9000000).0;
        let local_txn = get_local_commitment_txn!(nodes[1], chan_1.2);
+       assert_eq!(local_txn.len(), 1);
        assert_eq!(local_txn[0].input.len(), 1);
        check_spends!(local_txn[0], chan_1.3);
 
@@ -5426,10 +5334,13 @@ fn test_dynamic_spendable_outputs_local_htlc_success_tx() {
        }
        let node_txn = {
                let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
+               assert_eq!(node_txn.len(), 3);
+               assert_eq!(node_txn[0], node_txn[2]);
+               assert_eq!(node_txn[1], local_txn[0]);
                assert_eq!(node_txn[0].input.len(), 1);
                assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
                check_spends!(node_txn[0], local_txn[0]);
-               vec![node_txn[0].clone(), node_txn[2].clone()]
+               vec![node_txn[0].clone()]
        };
 
        let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
@@ -5438,9 +5349,8 @@ fn test_dynamic_spendable_outputs_local_htlc_success_tx() {
 
        // Verify that B is able to spend its own HTLC-Success tx thanks to spendable output event given back by its ChannelMonitor
        let spend_txn = check_spendable_outputs!(nodes[1], 1, node_cfgs[1].keys_manager, 100000);
-       assert_eq!(spend_txn.len(), 2);
+       assert_eq!(spend_txn.len(), 1);
        check_spends!(spend_txn[0], node_txn[0]);
-       check_spends!(spend_txn[1], node_txn[1]);
 }
 
 fn do_test_fail_backwards_unrevoked_remote_announce(deliver_last_raa: bool, announce_latest: bool) {
@@ -5735,9 +5645,10 @@ fn test_dynamic_spendable_outputs_local_htlc_timeout_tx() {
 
        // Verify that A is able to spend its own HTLC-Timeout tx thanks to spendable output event given back by its ChannelMonitor
        let spend_txn = check_spendable_outputs!(nodes[0], 1, node_cfgs[0].keys_manager, 100000);
-       assert_eq!(spend_txn.len(), 2);
+       assert_eq!(spend_txn.len(), 3);
        check_spends!(spend_txn[0], local_txn[0]);
        check_spends!(spend_txn[1], htlc_timeout);
+       check_spends!(spend_txn[2], local_txn[0], htlc_timeout);
 }
 
 #[test]
@@ -5751,8 +5662,8 @@ fn test_key_derivation_params() {
        // We manually create the node configuration to backup the seed.
        let seed = [42; 32];
        let keys_manager = test_utils::TestKeysInterface::new(&seed, Network::Testnet);
-       let chain_monitor = test_utils::TestChainMonitor::new(Some(&chanmon_cfgs[0].chain_source), &chanmon_cfgs[0].tx_broadcaster, &chanmon_cfgs[0].logger, &chanmon_cfgs[0].fee_estimator, &chanmon_cfgs[0].persister);
-       let node = NodeCfg { chain_source: &chanmon_cfgs[0].chain_source, logger: &chanmon_cfgs[0].logger, tx_broadcaster: &chanmon_cfgs[0].tx_broadcaster, fee_estimator: &chanmon_cfgs[0].fee_estimator, chain_monitor, keys_manager, node_seed: seed };
+       let chain_monitor = test_utils::TestChainMonitor::new(Some(&chanmon_cfgs[0].chain_source), &chanmon_cfgs[0].tx_broadcaster, &chanmon_cfgs[0].logger, &chanmon_cfgs[0].fee_estimator, &chanmon_cfgs[0].persister, &keys_manager);
+       let node = NodeCfg { chain_source: &chanmon_cfgs[0].chain_source, logger: &chanmon_cfgs[0].logger, tx_broadcaster: &chanmon_cfgs[0].tx_broadcaster, fee_estimator: &chanmon_cfgs[0].fee_estimator, chain_monitor, keys_manager: &keys_manager, node_seed: seed };
        let mut node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
        node_cfgs.remove(0);
        node_cfgs.insert(0, node);
@@ -5805,9 +5716,10 @@ fn test_key_derivation_params() {
        // Verify that A is able to spend its own HTLC-Timeout tx thanks to spendable output event given back by its ChannelMonitor
        let new_keys_manager = test_utils::TestKeysInterface::new(&seed, Network::Testnet);
        let spend_txn = check_spendable_outputs!(nodes[0], 1, new_keys_manager, 100000);
-       assert_eq!(spend_txn.len(), 2);
+       assert_eq!(spend_txn.len(), 3);
        check_spends!(spend_txn[0], local_txn_1[0]);
        check_spends!(spend_txn[1], htlc_timeout);
+       check_spends!(spend_txn[2], local_txn_1[0], htlc_timeout);
 }
 
 #[test]
@@ -7086,7 +6998,8 @@ fn do_test_failure_delay_dust_htlc_local_commitment(announce_latest: bool) {
        // We can have at most two valid local commitment tx, so both cases must be covered, and both txs must be checked to get them all as
        // HTLC could have been removed from lastest local commitment tx but still valid until we get remote RAA
 
-       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
        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);
@@ -7288,7 +7201,7 @@ fn test_upfront_shutdown_script() {
        let mut node_0_shutdown = get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[2].node.get_our_node_id());
        node_0_shutdown.scriptpubkey = Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script().to_p2sh();
        // Test we enforce upfront_scriptpbukey if by providing a diffrent one at closing that  we disconnect peer
-       nodes[2].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &node_0_shutdown);
+       nodes[2].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
     assert!(regex::Regex::new(r"Got shutdown request with a scriptpubkey \([A-Fa-f0-9]+\) which did not match their previous scriptpubkey.").unwrap().is_match(check_closed_broadcast!(nodes[2], true).unwrap().data.as_str()));
        check_added_monitors!(nodes[2], 1);
 
@@ -7297,7 +7210,7 @@ fn test_upfront_shutdown_script() {
        nodes[0].node.close_channel(&OutPoint { txid: chan.3.txid(), index: 0 }.to_channel_id()).unwrap();
        let node_0_shutdown = get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[2].node.get_our_node_id());
        // We test that in case of peer committing upfront to a script, if it oesn't change at closing, we sign
-       nodes[2].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &node_0_shutdown);
+       nodes[2].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
        let events = nodes[2].node.get_and_clear_pending_msg_events();
        assert_eq!(events.len(), 1);
        match events[0] {
@@ -7311,7 +7224,7 @@ fn test_upfront_shutdown_script() {
        nodes[0].node.close_channel(&OutPoint { txid: chan.3.txid(), index: 0 }.to_channel_id()).unwrap();
        let mut node_1_shutdown = get_event_msg!(nodes[0], MessageSendEvent::SendShutdown, nodes[1].node.get_our_node_id());
        node_1_shutdown.scriptpubkey = Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script().to_p2sh();
-       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &node_1_shutdown);
+       nodes[1].node.handle_shutdown(&nodes[0].node.get_our_node_id(), &InitFeatures::known(), &node_1_shutdown);
        let events = nodes[1].node.get_and_clear_pending_msg_events();
        assert_eq!(events.len(), 1);
        match events[0] {
@@ -7325,7 +7238,7 @@ fn test_upfront_shutdown_script() {
        nodes[1].node.close_channel(&OutPoint { txid: chan.3.txid(), index: 0 }.to_channel_id()).unwrap();
        let mut node_0_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
        node_0_shutdown.scriptpubkey = Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script().to_p2sh();
-       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &node_0_shutdown);
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
        let events = nodes[0].node.get_and_clear_pending_msg_events();
        assert_eq!(events.len(), 1);
        match events[0] {
@@ -7339,7 +7252,70 @@ fn test_upfront_shutdown_script() {
        nodes[1].node.close_channel(&OutPoint { txid: chan.3.txid(), index: 0 }.to_channel_id()).unwrap();
        let mut node_0_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
        node_0_shutdown.scriptpubkey = Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script().to_p2sh();
-       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &node_0_shutdown);
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 2);
+       match events[0] {
+               MessageSendEvent::SendShutdown { node_id, .. } => { assert_eq!(node_id, nodes[1].node.get_our_node_id()) }
+               _ => panic!("Unexpected event"),
+       }
+       match events[1] {
+               MessageSendEvent::SendClosingSigned { node_id, .. } => { assert_eq!(node_id, nodes[1].node.get_our_node_id()) }
+               _ => panic!("Unexpected event"),
+       }
+}
+
+#[test]
+fn test_upfront_shutdown_script_unsupport_segwit() {
+       // We test that channel is closed early
+       // if a segwit program is passed as upfront shutdown script,
+       // but the peer does not support segwit.
+       let chanmon_cfgs = create_chanmon_cfgs(2);
+       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);
+
+       nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100000, 10001, 42, None).unwrap();
+
+       let mut open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
+       open_channel.shutdown_scriptpubkey = Present(Builder::new().push_int(16)
+               .push_slice(&[0, 0])
+               .into_script());
+
+       let features = InitFeatures::known().clear_shutdown_anysegwit();
+       nodes[0].node.handle_open_channel(&nodes[0].node.get_our_node_id(), features, &open_channel);
+
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 1);
+       match events[0] {
+               MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { ref msg }, node_id } => {
+                       assert_eq!(node_id, nodes[0].node.get_our_node_id());
+                       assert!(regex::Regex::new(r"Peer is signaling upfront_shutdown but has provided a non-accepted scriptpubkey format. script: (\([A-Fa-f0-9]+\))").unwrap().is_match(&*msg.data));
+               },
+               _ => panic!("Unexpected event"),
+       }
+}
+
+#[test]
+fn test_shutdown_script_any_segwit_allowed() {
+       let mut config = UserConfig::default();
+       config.channel_options.announced_channel = true;
+       config.peer_channel_config_limits.force_announced_channel_preference = false;
+       config.channel_options.commit_upfront_shutdown_pubkey = false;
+       let user_cfgs = [None, Some(config), None];
+       let chanmon_cfgs = create_chanmon_cfgs(3);
+       let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &user_cfgs);
+       let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+
+       //// We test if the remote peer accepts opt_shutdown_anysegwit, a witness program can be used on shutdown
+       let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
+       nodes[1].node.close_channel(&OutPoint { txid: chan.3.txid(), index: 0 }.to_channel_id()).unwrap();
+       let mut node_0_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
+       node_0_shutdown.scriptpubkey = Builder::new().push_int(16)
+               .push_slice(&[0, 0])
+               .into_script();
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
        let events = nodes[0].node.get_and_clear_pending_msg_events();
        assert_eq!(events.len(), 2);
        match events[0] {
@@ -7352,6 +7328,73 @@ fn test_upfront_shutdown_script() {
        }
 }
 
+#[test]
+fn test_shutdown_script_any_segwit_not_allowed() {
+       let mut config = UserConfig::default();
+       config.channel_options.announced_channel = true;
+       config.peer_channel_config_limits.force_announced_channel_preference = false;
+       config.channel_options.commit_upfront_shutdown_pubkey = false;
+       let user_cfgs = [None, Some(config), None];
+       let chanmon_cfgs = create_chanmon_cfgs(3);
+       let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &user_cfgs);
+       let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+
+       //// We test that if the remote peer does not accept opt_shutdown_anysegwit, the witness program cannot be used on shutdown
+       let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
+       nodes[1].node.close_channel(&OutPoint { txid: chan.3.txid(), index: 0 }.to_channel_id()).unwrap();
+       let mut node_0_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
+       // Make an any segwit version script
+       node_0_shutdown.scriptpubkey = Builder::new().push_int(16)
+               .push_slice(&[0, 0])
+               .into_script();
+       let flags_no = InitFeatures::known().clear_shutdown_anysegwit();
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &flags_no, &node_0_shutdown);
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 2);
+       match events[1] {
+               MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { ref msg }, node_id } => {
+                       assert_eq!(node_id, nodes[1].node.get_our_node_id());
+                       assert_eq!(msg.data, "Got a nonstandard scriptpubkey (60020000) from remote peer".to_owned())
+               },
+               _ => panic!("Unexpected event"),
+       }
+       check_added_monitors!(nodes[0], 1);
+}
+
+#[test]
+fn test_shutdown_script_segwit_but_not_anysegwit() {
+       let mut config = UserConfig::default();
+       config.channel_options.announced_channel = true;
+       config.peer_channel_config_limits.force_announced_channel_preference = false;
+       config.channel_options.commit_upfront_shutdown_pubkey = false;
+       let user_cfgs = [None, Some(config), None];
+       let chanmon_cfgs = create_chanmon_cfgs(3);
+       let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &user_cfgs);
+       let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+
+       //// We test that if shutdown any segwit is supported and we send a witness script with 0 version, this is not accepted
+       let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
+       nodes[1].node.close_channel(&OutPoint { txid: chan.3.txid(), index: 0 }.to_channel_id()).unwrap();
+       let mut node_0_shutdown = get_event_msg!(nodes[1], MessageSendEvent::SendShutdown, nodes[0].node.get_our_node_id());
+       // Make a segwit script that is not a valid as any segwit
+       node_0_shutdown.scriptpubkey = Builder::new().push_int(0)
+               .push_slice(&[0, 0])
+               .into_script();
+       nodes[0].node.handle_shutdown(&nodes[1].node.get_our_node_id(), &InitFeatures::known(), &node_0_shutdown);
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 2);
+       match events[1] {
+               MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { ref msg }, node_id } => {
+                       assert_eq!(node_id, nodes[1].node.get_our_node_id());
+                       assert_eq!(msg.data, "Got a nonstandard scriptpubkey (00020000) from remote peer".to_owned())
+               },
+               _ => panic!("Unexpected event"),
+       }
+       check_added_monitors!(nodes[0], 1);
+}
+
 #[test]
 fn test_user_configurable_csv_delay() {
        // We test our channel constructors yield errors when we pass them absurd csv delay
@@ -7367,8 +7410,7 @@ fn test_user_configurable_csv_delay() {
        let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 
        // We test config.our_to_self > BREAKDOWN_TIMEOUT is enforced in Channel::new_outbound()
-       let keys_manager: Arc<KeysInterface<ChanKeySigner = EnforcingChannelKeys>> = Arc::new(test_utils::TestKeysInterface::new(&nodes[0].node_seed, Network::Testnet));
-       if let Err(error) = Channel::new_outbound(&&test_utils::TestFeeEstimator { sat_per_kw: 253 }, &keys_manager, nodes[1].node.get_our_node_id(), 1000000, 1000000, 0, &low_our_to_self_config) {
+       if let Err(error) = Channel::new_outbound(&&test_utils::TestFeeEstimator { sat_per_kw: 253 }, &nodes[0].keys_manager, nodes[1].node.get_our_node_id(), 1000000, 1000000, 0, &low_our_to_self_config) {
                match error {
                        APIError::APIMisuseError { err } => { assert!(regex::Regex::new(r"Configured with an unreasonable our_to_self_delay \(\d+\) putting user funds at risks").unwrap().is_match(err.as_str())); },
                        _ => panic!("Unexpected event"),
@@ -7379,7 +7421,7 @@ fn test_user_configurable_csv_delay() {
        nodes[1].node.create_channel(nodes[0].node.get_our_node_id(), 1000000, 1000000, 42, None).unwrap();
        let mut open_channel = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
        open_channel.to_self_delay = 200;
-       if let Err(error) = Channel::new_from_req(&&test_utils::TestFeeEstimator { sat_per_kw: 253 }, &keys_manager, nodes[1].node.get_our_node_id(), InitFeatures::known(), &open_channel, 0, &low_our_to_self_config) {
+       if let Err(error) = Channel::new_from_req(&&test_utils::TestFeeEstimator { sat_per_kw: 253 }, &nodes[0].keys_manager, nodes[1].node.get_our_node_id(), InitFeatures::known(), &open_channel, 0, &low_our_to_self_config) {
                match error {
                        ChannelError::Close(err) => { assert!(regex::Regex::new(r"Configured with an unreasonable our_to_self_delay \(\d+\) putting user funds at risks").unwrap().is_match(err.as_str()));  },
                        _ => panic!("Unexpected event"),
@@ -7405,7 +7447,7 @@ fn test_user_configurable_csv_delay() {
        nodes[1].node.create_channel(nodes[0].node.get_our_node_id(), 1000000, 1000000, 42, None).unwrap();
        let mut open_channel = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
        open_channel.to_self_delay = 200;
-       if let Err(error) = Channel::new_from_req(&&test_utils::TestFeeEstimator { sat_per_kw: 253 }, &keys_manager, nodes[1].node.get_our_node_id(), InitFeatures::known(), &open_channel, 0, &high_their_to_self_config) {
+       if let Err(error) = Channel::new_from_req(&&test_utils::TestFeeEstimator { sat_per_kw: 253 }, &nodes[0].keys_manager, nodes[1].node.get_our_node_id(), InitFeatures::known(), &open_channel, 0, &high_their_to_self_config) {
                match error {
                        ChannelError::Close(err) => { assert!(regex::Regex::new(r"They wanted our payments to be delayed by a needlessly long period\. Upper limit: \d+\. Actual: \d+").unwrap().is_match(err.as_str())); },
                        _ => panic!("Unexpected event"),
@@ -7417,17 +7459,22 @@ fn test_user_configurable_csv_delay() {
 fn test_data_loss_protect() {
        // We want to be sure that :
        // * we don't broadcast our Local Commitment Tx in case of fallen behind
+       //   (but this is not quite true - we broadcast during Drop because chanmon is out of sync with chanmgr)
        // * we close channel in case of detecting other being fallen behind
        // * we are able to claim our own outputs thanks to to_remote being static
-       let keys_manager;
+       // TODO: this test is incomplete and the data_loss_protect implementation is incomplete - see issue #775
        let persister;
        let logger;
        let fee_estimator;
        let tx_broadcaster;
        let chain_source;
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       // We broadcast during Drop because chanmon is out of sync with chanmgr, which would cause a panic
+       // during signing due to revoked tx
+       chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
+       let keys_manager = &chanmon_cfgs[0].keys_manager;
        let monitor;
        let node_state_0;
-       let chanmon_cfgs = create_chanmon_cfgs(2);
        let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
        let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
        let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -7437,7 +7484,7 @@ fn test_data_loss_protect() {
        // Cache node A state before any channel update
        let previous_node_state = nodes[0].node.encode();
        let mut previous_chain_monitor_state = test_utils::TestVecWriter(Vec::new());
-       nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap().iter().next().unwrap().1.serialize_for_disk(&mut previous_chain_monitor_state).unwrap();
+       nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut previous_chain_monitor_state).unwrap();
 
        send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);
        send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);
@@ -7447,18 +7494,17 @@ fn test_data_loss_protect() {
 
        // Restore node A from previous state
        logger = test_utils::TestLogger::with_id(format!("node {}", 0));
-       let mut chain_monitor = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut ::std::io::Cursor::new(previous_chain_monitor_state.0)).unwrap().1;
+       let mut chain_monitor = <(Option<BlockHash>, ChannelMonitor<EnforcingSigner>)>::read(&mut ::std::io::Cursor::new(previous_chain_monitor_state.0), keys_manager).unwrap().1;
        chain_source = test_utils::TestChainSource::new(Network::Testnet);
        tx_broadcaster = test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())};
        fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 253 };
-       keys_manager = test_utils::TestKeysInterface::new(&nodes[0].node_seed, Network::Testnet);
        persister = test_utils::TestPersister::new();
-       monitor = test_utils::TestChainMonitor::new(Some(&chain_source), &tx_broadcaster, &logger, &fee_estimator, &persister);
+       monitor = test_utils::TestChainMonitor::new(Some(&chain_source), &tx_broadcaster, &logger, &fee_estimator, &persister, keys_manager);
        node_state_0 = {
                let mut channel_monitors = HashMap::new();
                channel_monitors.insert(OutPoint { txid: chan.3.txid(), index: 0 }, &mut chain_monitor);
-               <(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut ::std::io::Cursor::new(previous_node_state), ChannelManagerReadArgs {
-                       keys_manager: &keys_manager,
+               <(Option<BlockHash>, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut ::std::io::Cursor::new(previous_node_state), ChannelManagerReadArgs {
+                       keys_manager: keys_manager,
                        fee_estimator: &fee_estimator,
                        chain_monitor: &monitor,
                        logger: &logger,
@@ -7520,7 +7566,7 @@ fn test_data_loss_protect() {
        let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42};
        connect_block(&nodes[0], &Block { header, txdata: vec![node_txn[0].clone()]}, 0);
        connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 0, true, header.block_hash());
-       let spend_txn = check_spendable_outputs!(nodes[0], 1, node_cfgs[0].keys_manager, 100000);
+       let spend_txn = check_spendable_outputs!(nodes[0], 1, node_cfgs[0].keys_manager, 1000000);
        assert_eq!(spend_txn.len(), 1);
        check_spends!(spend_txn[0], node_txn[0]);
 }
@@ -7745,7 +7791,8 @@ fn test_bump_penalty_txn_on_revoked_htlcs() {
        // In case of penalty txn with too low feerates for getting into mempools, RBF-bump them to sure
        // we're able to claim outputs on revoked HTLC transactions before timelocks expiration
 
-       let chanmon_cfgs = create_chanmon_cfgs(2);
+       let mut chanmon_cfgs = create_chanmon_cfgs(2);
+       chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
        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);
@@ -8115,7 +8162,7 @@ fn test_counterparty_raa_skip_no_crash() {
        // commitment transaction, we would have happily carried on and provided them the next
        // commitment transaction based on one RAA forward. This would probably eventually have led to
        // channel closure, but it would not have resulted in funds loss. Still, our
-       // EnforcingChannelKeys would have paniced as it doesn't like jumps into the future. Here, we
+       // EnforcingSigner would have paniced as it doesn't like jumps into the future. Here, we
        // check simply that the channel is closed in response to such an RAA, but don't check whether
        // we decide to punish our counterparty for revoking their funds (as we don't currently
        // implement that).
@@ -8126,11 +8173,13 @@ fn test_counterparty_raa_skip_no_crash() {
        let channel_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).2;
 
        let mut guard = nodes[0].node.channel_state.lock().unwrap();
-       let keys = &guard.by_id.get_mut(&channel_id).unwrap().holder_keys;
+       let keys = &guard.by_id.get_mut(&channel_id).unwrap().get_signer();
        const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
+       let per_commitment_secret = keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER);
+       // Must revoke without gaps
+       keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER - 1);
        let next_per_commitment_point = PublicKey::from_secret_key(&Secp256k1::new(),
                &SecretKey::from_slice(&keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER - 2)).unwrap());
-       let per_commitment_secret = keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER);
 
        nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(),
                &msgs::RevokeAndACK { channel_id, per_commitment_secret, next_per_commitment_point });
@@ -8182,10 +8231,10 @@ fn test_bump_txn_sanitize_tracking_maps() {
        connect_block(&nodes[0], &Block { header: header_130, txdata: penalty_txn }, 130);
        connect_blocks(&nodes[0], 5, 130,  false, header_130.block_hash());
        {
-               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap();
+               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
                if let Some(monitor) = monitors.get(&OutPoint { txid: chan.3.txid(), index: 0 }) {
-                       assert!(monitor.onchain_tx_handler.pending_claim_requests.is_empty());
-                       assert!(monitor.onchain_tx_handler.claimable_outpoints.is_empty());
+                       assert!(monitor.inner.lock().unwrap().onchain_tx_handler.pending_claim_requests.is_empty());
+                       assert!(monitor.inner.lock().unwrap().onchain_tx_handler.claimable_outpoints.is_empty());
                }
        }
 }
@@ -8316,14 +8365,14 @@ fn test_update_err_monitor_lockdown() {
        let logger = test_utils::TestLogger::with_id(format!("node {}", 0));
        let persister = test_utils::TestPersister::new();
        let watchtower = {
-               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap();
+               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
                let monitor = monitors.get(&outpoint).unwrap();
                let mut w = test_utils::TestVecWriter(Vec::new());
-               monitor.serialize_for_disk(&mut w).unwrap();
-               let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
-                               &mut ::std::io::Cursor::new(&w.0)).unwrap().1;
+               monitor.write(&mut w).unwrap();
+               let new_monitor = <(Option<BlockHash>, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
+                               &mut ::std::io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
                assert!(new_monitor == *monitor);
-               let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister);
+               let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
                assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
                watchtower
        };
@@ -8375,14 +8424,14 @@ fn test_concurrent_monitor_claim() {
        let logger = test_utils::TestLogger::with_id(format!("node {}", "Alice"));
        let persister = test_utils::TestPersister::new();
        let watchtower_alice = {
-               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap();
+               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
                let monitor = monitors.get(&outpoint).unwrap();
                let mut w = test_utils::TestVecWriter(Vec::new());
-               monitor.serialize_for_disk(&mut w).unwrap();
-               let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
-                               &mut ::std::io::Cursor::new(&w.0)).unwrap().1;
+               monitor.write(&mut w).unwrap();
+               let new_monitor = <(Option<BlockHash>, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
+                               &mut ::std::io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
                assert!(new_monitor == *monitor);
-               let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister);
+               let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
                assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
                watchtower
        };
@@ -8401,14 +8450,14 @@ fn test_concurrent_monitor_claim() {
        let logger = test_utils::TestLogger::with_id(format!("node {}", "Bob"));
        let persister = test_utils::TestPersister::new();
        let watchtower_bob = {
-               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.lock().unwrap();
+               let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
                let monitor = monitors.get(&outpoint).unwrap();
                let mut w = test_utils::TestVecWriter(Vec::new());
-               monitor.serialize_for_disk(&mut w).unwrap();
-               let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
-                               &mut ::std::io::Cursor::new(&w.0)).unwrap().1;
+               monitor.write(&mut w).unwrap();
+               let new_monitor = <(Option<BlockHash>, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
+                               &mut ::std::io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
                assert!(new_monitor == *monitor);
-               let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister);
+               let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
                assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
                watchtower
        };
@@ -8586,7 +8635,7 @@ fn do_test_onchain_htlc_settlement_after_close(broadcast_alice: bool, go_onchain
        // responds by (1) broadcasting a channel update and (2) adding a new ChannelMonitor.
        let mut force_closing_node = 0; // Alice force-closes
        if !broadcast_alice { force_closing_node = 1; } // Bob force-closes
-       nodes[force_closing_node].node.force_close_channel(&chan_ab.2);
+       nodes[force_closing_node].node.force_close_channel(&chan_ab.2).unwrap();
        check_closed_broadcast!(nodes[force_closing_node], false);
        check_added_monitors!(nodes[force_closing_node], 1);
        if go_onchain_before_fulfill {
@@ -8869,3 +8918,66 @@ fn test_duplicate_chan_id() {
        update_nodes_with_chan_announce(&nodes, 0, 1, &announcement, &as_update, &bs_update);
        send_payment(&nodes[0], &[&nodes[1]], 8000000, 8_000_000);
 }
+
+#[test]
+fn test_error_chans_closed() {
+       // Test that we properly handle error messages, closing appropriate channels.
+       //
+       // Prior to #787 we'd allow a peer to make us force-close a channel we had with a different
+       // peer. The "real" fix for that is to index channels with peers_ids, however in the mean time
+       // we can test various edge cases around it to ensure we don't regress.
+       let chanmon_cfgs = create_chanmon_cfgs(3);
+       let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
+       let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+
+       // Create some initial channels
+       let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
+       let chan_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
+       let chan_3 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, InitFeatures::known(), InitFeatures::known());
+
+       assert_eq!(nodes[0].node.list_usable_channels().len(), 3);
+       assert_eq!(nodes[1].node.list_usable_channels().len(), 2);
+       assert_eq!(nodes[2].node.list_usable_channels().len(), 1);
+
+       // Closing a channel from a different peer has no effect
+       nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id: chan_3.2, data: "ERR".to_owned() });
+       assert_eq!(nodes[0].node.list_usable_channels().len(), 3);
+
+       // Closing one channel doesn't impact others
+       nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id: chan_2.2, data: "ERR".to_owned() });
+       check_added_monitors!(nodes[0], 1);
+       check_closed_broadcast!(nodes[0], false);
+       assert_eq!(nodes[0].node.list_usable_channels().len(), 2);
+       assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_1.2 || nodes[0].node.list_usable_channels()[1].channel_id == chan_1.2);
+       assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_3.2 || nodes[0].node.list_usable_channels()[1].channel_id == chan_3.2);
+
+       // A null channel ID should close all channels
+       let _chan_4 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
+       nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id: [0; 32], data: "ERR".to_owned() });
+       check_added_monitors!(nodes[0], 2);
+       let events = nodes[0].node.get_and_clear_pending_msg_events();
+       assert_eq!(events.len(), 2);
+       match events[0] {
+               MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
+                       assert_eq!(msg.contents.flags & 2, 2);
+               },
+               _ => panic!("Unexpected event"),
+       }
+       match events[1] {
+               MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
+                       assert_eq!(msg.contents.flags & 2, 2);
+               },
+               _ => panic!("Unexpected event"),
+       }
+       // Note that at this point users of a standard PeerHandler will end up calling
+       // peer_disconnected with no_connection_possible set to false, duplicating the
+       // close-all-channels logic. That's OK, we don't want to end up not force-closing channels for
+       // users with their own peer handling logic. We duplicate the call here, however.
+       assert_eq!(nodes[0].node.list_usable_channels().len(), 1);
+       assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_3.2);
+
+       nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), true);
+       assert_eq!(nodes[0].node.list_usable_channels().len(), 1);
+       assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_3.2);
+}