X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=src%2Fln%2Fchannel.rs;h=7cc0dea5ff7e75875d901218b44fc223e9d3dd81;hb=7b4f382e26368be7f010a081e553803b98eb9550;hp=fe92f9d6ff8ce917c48a90fe18ad7619dadb1e81;hpb=374ea1f05e301b7f2c47781ad4f7a3ac5ac909fd;p=rust-lightning

diff --git a/src/ln/channel.rs b/src/ln/channel.rs
index fe92f9d6..7cc0dea5 100644
--- a/src/ln/channel.rs
+++ b/src/ln/channel.rs
@@ -2,7 +2,6 @@ use bitcoin::blockdata::block::BlockHeader;
 use bitcoin::blockdata::script::{Script,Builder};
 use bitcoin::blockdata::transaction::{TxIn, TxOut, Transaction, SigHashType};
 use bitcoin::blockdata::opcodes;
-use bitcoin::util::uint::Uint256;
 use bitcoin::util::hash::{Sha256dHash, Hash160};
 use bitcoin::util::bip143;
 use bitcoin::network::serialize::BitcoinHash;
@@ -18,9 +17,10 @@ use ln::msgs;
 use ln::msgs::{HandleError, MsgEncodable};
 use ln::channelmonitor::ChannelMonitor;
 use ln::channelmanager::{PendingForwardHTLCInfo, HTLCFailReason};
-use ln::chan_utils::{TxCreationKeys,HTLCOutputInCommitment};
+use ln::chan_utils::{TxCreationKeys,HTLCOutputInCommitment,HTLC_SUCCESS_TX_WEIGHT,HTLC_TIMEOUT_TX_WEIGHT};
 use ln::chan_utils;
 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
+use chain::transaction::OutPoint;
 use util::{transaction_utils,rng};
 use util::sha2::Sha256;
 
@@ -43,7 +43,7 @@ impl ChannelKeys {
 	pub fn new_from_seed(seed: &[u8; 32]) -> Result<ChannelKeys, secp256k1::Error> {
 		let mut prk = [0; 32];
 		hkdf_extract(Sha256::new(), b"rust-lightning key gen salt", seed, &mut prk);
-		let secp_ctx = Secp256k1::new();
+		let secp_ctx = Secp256k1::without_caps();
 
 		let mut okm = [0; 32];
 		hkdf_expand(Sha256::new(), &prk, b"rust-lightning funding key info", &mut okm);
@@ -230,12 +230,12 @@ const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 |
 
 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
-// calling get_channel_id() before we're set up or things like get_outbound_funding_signed on an
+// calling channel_id() before we're set up or things like get_outbound_funding_signed on an
 // inbound channel.
 pub struct Channel {
 	user_id: u64,
 
-	channel_id: Uint256,
+	channel_id: [u8; 32],
 	channel_state: u32,
 	channel_outbound: bool,
 	secp_ctx: Secp256k1,
@@ -244,6 +244,10 @@ pub struct Channel {
 
 	local_keys: ChannelKeys,
 
+	// Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
+	// generation start at 0 and count up...this simplifies some parts of implementation at the
+	// cost of others, but should really just be changed.
+
 	cur_local_commitment_transaction_number: u64,
 	cur_remote_commitment_transaction_number: u64,
 	value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
@@ -254,6 +258,12 @@ pub struct Channel {
 	channel_update_count: u32,
 	feerate_per_kw: u64,
 
+	#[cfg(test)]
+	// Used in ChannelManager's tests to send a revoked transaction
+	pub last_local_commitment_txn: Vec<Transaction>,
+	#[cfg(not(test))]
+	last_local_commitment_txn: Vec<Transaction>,
+
 	last_sent_closing_fee: Option<(u64, u64)>, // (feerate, fee)
 
 	/// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
@@ -285,6 +295,8 @@ pub struct Channel {
 	their_delayed_payment_basepoint: PublicKey,
 	their_htlc_basepoint: PublicKey,
 	their_cur_commitment_point: PublicKey,
+
+	their_prev_commitment_point: Option<PublicKey>,
 	their_node_id: PublicKey,
 
 	their_shutdown_scriptpubkey: Option<Script>,
@@ -305,17 +317,18 @@ const BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7; //TODO?
 const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 14;
 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
 const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
-const HTLC_SUCCESS_TX_WEIGHT: u64 = 703;
-const HTLC_TIMEOUT_TX_WEIGHT: u64 = 663;
 const SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT: u64 = 79; // prevout: 36, nSequence: 4, script len: 1, witness lengths: (3+1)/4, sig: 73/4, if-selector: 1, redeemScript: (6 ops + 2*33 pubkeys + 1*2 delay)/4
 const B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT: u64 = 104; // prevout: 40, nSequence: 4, script len: 1, witness lengths: 3/4, sig: 73/4, pubkey: 33/4, output: 31 (TODO: Wrong? Useless?)
+/// Maximmum `funding_satoshis` value, according to the BOLT #2 specification
+/// it's 2^24.
+pub const MAX_FUNDING_SATOSHIS: u64 = (1 << 24);
 
 macro_rules! secp_call {
 	( $res: expr, $err: expr ) => {
 		match $res {
 			Ok(key) => key,
 			//TODO: make the error a parameter
-			Err(_) => return Err(HandleError{err: $err, msg: Some(msgs::ErrorAction::DisconnectPeer{})})
+			Err(_) => return Err(HandleError{err: $err, action: Some(msgs::ErrorAction::DisconnectPeer{})})
 		}
 	};
 }
@@ -333,7 +346,7 @@ impl Channel {
 
 	/// Guaranteed to return a value no larger than channel_value_satoshis
 	fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
-		cmp::min(channel_value_satoshis, 10) //TODO
+		cmp::min(channel_value_satoshis, 1000) //TODO
 	}
 
 	fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
@@ -346,34 +359,27 @@ impl Channel {
 
 	// Constructors:
 
-	/// panics if channel_value_satoshis is >= (1 << 24)
-	pub fn new_outbound(fee_estimator: &FeeEstimator, their_node_id: PublicKey, channel_value_satoshis: u64, announce_publicly: bool, user_id: u64) -> Channel {
-		if channel_value_satoshis >= (1 << 24) {
+	/// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`
+	pub fn new_outbound(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, channel_value_satoshis: u64, announce_publicly: bool, user_id: u64) -> Channel {
+		if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
 			panic!("funding value > 2^24");
 		}
 
 		let feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Normal);
 		let background_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
 
-		let mut key_seed = [0u8; 32];
-		rng::fill_bytes(&mut key_seed);
-		let chan_keys = match ChannelKeys::new_from_seed(&key_seed) {
-			Ok(key) => key,
-			Err(_) => panic!("RNG is busted!")
-		};
-
 		let secp_ctx = Secp256k1::new();
 		let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).unwrap().serialize());
 		let our_channel_monitor_claim_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script();
 		let channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
 		                                          &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key).unwrap(),
-		                                          &PublicKey::from_secret_key(&secp_ctx, &chan_keys.htlc_base_key).unwrap(),
+		                                          &chan_keys.htlc_base_key,
 		                                          BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
 
 		Channel {
 			user_id: user_id,
 
-			channel_id: rng::rand_uint256(),
+			channel_id: rng::rand_u832(),
 			channel_state: ChannelState::OurInitSent as u32,
 			channel_outbound: true,
 			secp_ctx: secp_ctx,
@@ -388,7 +394,9 @@ impl Channel {
 			holding_cell_htlc_updates: Vec::new(),
 			next_local_htlc_id: 0,
 			next_remote_htlc_id: 0,
-			channel_update_count: 0,
+			channel_update_count: 1,
+
+			last_local_commitment_txn: Vec::new(),
 
 			last_sent_closing_fee: None,
 
@@ -413,6 +421,8 @@ impl Channel {
 			their_delayed_payment_basepoint: PublicKey::new(),
 			their_htlc_basepoint: PublicKey::new(),
 			their_cur_commitment_point: PublicKey::new(),
+
+			their_prev_commitment_point: None,
 			their_node_id: their_node_id,
 
 			their_shutdown_scriptpubkey: None,
@@ -423,10 +433,10 @@ impl Channel {
 
 	fn check_remote_fee(fee_estimator: &FeeEstimator, feerate_per_kw: u32) -> Result<(), HandleError> {
 		if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background) * 250 {
-			return Err(HandleError{err: "Peer's feerate much too low", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "Peer's feerate much too low", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::HighPriority) * 375 { // 375 = 250 * 1.5x
-			return Err(HandleError{err: "Peer's feerate much too high", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "Peer's feerate much too high", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		Ok(())
 	}
@@ -435,38 +445,32 @@ impl Channel {
 	/// Assumes chain_hash has already been checked and corresponds with what we expect!
 	/// Generally prefers to take the DisconnectPeer action on failure, as a notice to the sender
 	/// that we're rejecting the new channel.
-	pub fn new_from_req(fee_estimator: &FeeEstimator, their_node_id: PublicKey, msg: &msgs::OpenChannel, user_id: u64, announce_publicly: bool) -> Result<Channel, HandleError> {
+	pub fn new_from_req(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, msg: &msgs::OpenChannel, user_id: u64, announce_publicly: bool) -> Result<Channel, HandleError> {
 		// Check sanity of message fields:
-		if msg.funding_satoshis >= (1 << 24) {
-			return Err(HandleError{err: "funding value > 2^24", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
-		}
-		if msg.funding_satoshis > 21000000 * 100000000 {
-			return Err(HandleError{err: "More funding_satoshis than there are satoshis!", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+		if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
+			return Err(HandleError{err: "funding value > 2^24", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		if msg.channel_reserve_satoshis > msg.funding_satoshis {
-			return Err(HandleError{err: "Bogus channel_reserve_satoshis", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "Bogus channel_reserve_satoshis", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
-			return Err(HandleError{err: "push_msat more than highest possible value", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "push_msat more than highest possible value", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		if msg.dust_limit_satoshis > msg.funding_satoshis {
-			return Err(HandleError{err: "Peer never wants payout outputs?", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
-		}
-		if msg.max_htlc_value_in_flight_msat > msg.funding_satoshis * 1000 {
-			return Err(HandleError{err: "Bogus max_htlc_value_in_flight_satoshis", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "Peer never wants payout outputs?", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
-			return Err(HandleError{err: "Minimum htlc value is full channel value", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "Minimum htlc value is full channel value", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
 		if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
-			return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		if msg.max_accepted_htlcs < 1 {
-			return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 		if (msg.channel_flags & 254) != 0 {
-			return Err(HandleError{err: "unknown channel_flags", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
+			return Err(HandleError{err: "unknown channel_flags", action: Some(msgs::ErrorAction::DisconnectPeer{})});
 		}
 
 		// Convert things into internal flags and prep our state:
@@ -475,21 +479,15 @@ impl Channel {
 
 		let background_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
 
-		let mut key_seed = [0u8; 32];
-		rng::fill_bytes(&mut key_seed);
-		let chan_keys = match ChannelKeys::new_from_seed(&key_seed) {
-			Ok(key) => key,
-			Err(_) => panic!("RNG is busted!")
-		};
-
 		let secp_ctx = Secp256k1::new();
 		let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).unwrap().serialize());
 		let our_channel_monitor_claim_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script();
 		let mut channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
-		                                          &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key).unwrap(),
-		                                          &PublicKey::from_secret_key(&secp_ctx, &chan_keys.htlc_base_key).unwrap(),
-		                                          BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
+		                                              &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key).unwrap(),
+		                                              &chan_keys.htlc_base_key,
+		                                              BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
 		channel_monitor.set_their_htlc_base_key(&msg.htlc_basepoint);
+		channel_monitor.set_their_to_self_delay(msg.to_self_delay);
 
 		let mut chan = Channel {
 			user_id: user_id,
@@ -508,7 +506,9 @@ impl Channel {
 			holding_cell_htlc_updates: Vec::new(),
 			next_local_htlc_id: 0,
 			next_remote_htlc_id: 0,
-			channel_update_count: 0,
+			channel_update_count: 1,
+
+			last_local_commitment_txn: Vec::new(),
 
 			last_sent_closing_fee: None,
 
@@ -521,7 +521,7 @@ impl Channel {
 			channel_value_satoshis: msg.funding_satoshis,
 			their_dust_limit_satoshis: msg.dust_limit_satoshis,
 			our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
-			their_max_htlc_value_in_flight_msat: msg.max_htlc_value_in_flight_msat,
+			their_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
 			their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
 			their_htlc_minimum_msat: msg.htlc_minimum_msat,
 			our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(msg.feerate_per_kw as u64),
@@ -534,6 +534,8 @@ impl Channel {
 			their_delayed_payment_basepoint: msg.delayed_payment_basepoint,
 			their_htlc_basepoint: msg.htlc_basepoint,
 			their_cur_commitment_point: msg.first_per_commitment_point,
+
+			their_prev_commitment_point: None,
 			their_node_id: their_node_id,
 
 			their_shutdown_scriptpubkey: None,
@@ -593,13 +595,13 @@ impl Channel {
 	/// which peer generated this transaction and "to whom" this transaction flows.
 	#[inline]
 	fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool) -> (Transaction, Vec<HTLCOutputInCommitment>) {
-		let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ commitment_number;
+		let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ (0xffffffffffff - commitment_number);
 
 		let txins = {
 			let mut ins: Vec<TxIn> = Vec::new();
 			ins.push(TxIn {
-				prev_hash: self.channel_monitor.get_funding_txo().unwrap().0,
-				prev_index: self.channel_monitor.get_funding_txo().unwrap().1 as u32,
+				prev_hash: self.channel_monitor.get_funding_txo().unwrap().txid,
+				prev_index: self.channel_monitor.get_funding_txo().unwrap().index as u32,
 				script_sig: Script::new(),
 				sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
 				witness: Vec::new(),
@@ -607,7 +609,7 @@ impl Channel {
 			ins
 		};
 
-		let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::new();
+		let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::with_capacity(self.pending_htlcs.len() + 2);
 
 		let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
 		let mut remote_htlc_total_msat = 0;
@@ -698,8 +700,8 @@ impl Channel {
 
 		transaction_utils::sort_outputs(&mut txouts);
 
-		let mut outputs: Vec<TxOut> = Vec::new();
-		let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::new();
+		let mut outputs: Vec<TxOut> = Vec::with_capacity(txouts.len());
+		let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::with_capacity(txouts.len());
 		for (idx, out) in txouts.drain(..).enumerate() {
 			outputs.push(out.0);
 			if let Some(out_htlc) = out.1 {
@@ -732,8 +734,8 @@ impl Channel {
 		let txins = {
 			let mut ins: Vec<TxIn> = Vec::new();
 			ins.push(TxIn {
-				prev_hash: self.channel_monitor.get_funding_txo().unwrap().0,
-				prev_index: self.channel_monitor.get_funding_txo().unwrap().1 as u32,
+				prev_hash: self.channel_monitor.get_funding_txo().unwrap().txid,
+				prev_index: self.channel_monitor.get_funding_txo().unwrap().index as u32,
 				script_sig: Script::new(),
 				sequence: 0xffffffff,
 				witness: Vec::new(),
@@ -863,40 +865,25 @@ impl Channel {
 	/// @local is used only to convert relevant internal structures which refer to remote vs local
 	/// to decide value of outputs and direction of HTLCs.
 	fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys) -> Transaction {
-		let mut txins: Vec<TxIn> = Vec::new();
-		txins.push(TxIn {
-			prev_hash: prev_hash.clone(),
-			prev_index: htlc.transaction_output_index,
-			script_sig: Script::new(),
-			sequence: 0,
-			witness: Vec::new(),
-		});
+		chan_utils::build_htlc_transaction(prev_hash, self.feerate_per_kw, if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT }, htlc, &keys.a_delayed_payment_key, &keys.revocation_key)
+	}
 
-		let total_fee = if htlc.offered {
-				self.feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000
-			} else {
-				self.feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000
-			};
+	fn create_htlc_tx_signature(&self, tx: &Transaction, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(Script, Signature, bool), HandleError> {
+		if tx.input.len() != 1 {
+			panic!("Tried to sign HTLC transaction that had input count != 1!");
+		}
 
-		let mut txouts: Vec<TxOut> = Vec::new();
-		txouts.push(TxOut {
-			script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
-			                                                       if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT },
-			                                                       &keys.a_delayed_payment_key).to_v0_p2wsh(),
-			value: htlc.amount_msat / 1000 - total_fee //TODO: BOLT 3 does not specify if we should add amount_msat before dividing or if we should divide by 1000 before subtracting (as we do here)
-		});
+		let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
 
-		Transaction {
-			version: 2,
-			lock_time: if htlc.offered { htlc.cltv_expiry } else { 0 },
-			input: txins,
-			output: txouts,
-		}
+		let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &keys.per_commitment_point, &self.local_keys.htlc_base_key));
+		let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
+		let is_local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key).unwrap() == keys.a_htlc_key;
+		Ok((htlc_redeemscript, self.secp_ctx.sign(&sighash, &our_htlc_key).unwrap(), is_local_tx))
 	}
 
 	/// Signs a transaction created by build_htlc_transaction. If the transaction is an
 	/// HTLC-Success transaction (ie htlc.offered is false), preimate must be set!
-	fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(), HandleError> {
+	fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<Signature, HandleError> {
 		if tx.input.len() != 1 {
 			panic!("Tried to sign HTLC transaction that had input count != 1!");
 		}
@@ -904,13 +891,7 @@ impl Channel {
 			panic!("Tried to re-sign HTLC transaction");
 		}
 
-		let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
-
-		let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &keys.per_commitment_point, &self.local_keys.htlc_base_key));
-		let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
-		let our_sig = self.secp_ctx.sign(&sighash, &our_htlc_key).unwrap();
-
-		let local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key).unwrap() == keys.a_htlc_key;
+		let (htlc_redeemscript, our_sig, local_tx) = self.create_htlc_tx_signature(tx, htlc, keys)?;
 
 		tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
 
@@ -932,10 +913,10 @@ impl Channel {
 
 		tx.input[0].witness.push(htlc_redeemscript.into_vec());
 
-		Ok(())
+		Ok(our_sig)
 	}
 
-	pub fn get_update_fulfill_htlc(&mut self, payment_preimage_arg: [u8; 32]) -> Result<Option<msgs::UpdateFulfillHTLC>, HandleError> {
+	pub fn get_update_fulfill_htlc(&mut self, payment_preimage_arg: [u8; 32]) -> Result<Option<(msgs::UpdateFulfillHTLC, ChannelMonitor)>, HandleError> {
 		// Either ChannelFunded got set (which means it wont bet unset) or there is no way any
 		// caller thought we could have something claimed (cause we wouldn't have accepted in an
 		// incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
@@ -961,7 +942,7 @@ impl Channel {
 					},
 					&HTLCUpdateAwaitingACK::FailHTLC { ref payment_hash, .. } => {
 						if payment_hash_calc == *payment_hash {
-							return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
+							return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", action: None});
 						}
 					},
 					_ => {}
@@ -988,35 +969,37 @@ impl Channel {
 				} else if htlc.state == HTLCState::RemoteAnnounced {
 					panic!("Somehow forwarded HTLC prior to remote revocation!");
 				} else if htlc.state == HTLCState::LocalRemoved || htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
-					return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
+					return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", action: None});
 				} else {
 					panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
 				}
 			}
 		}
 		if htlc_amount_msat == 0 {
-			return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
+			return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", action: None});
 		}
-		self.channel_monitor.provide_payment_preimage(&payment_preimage_arg);
+		self.channel_monitor.provide_payment_preimage(&payment_hash_calc, &payment_preimage_arg);
 
-		Ok(Some(msgs::UpdateFulfillHTLC {
+		Ok(Some((msgs::UpdateFulfillHTLC {
 			channel_id: self.channel_id(),
 			htlc_id: htlc_id,
 			payment_preimage: payment_preimage_arg,
-		}))
+		}, self.channel_monitor.clone())))
 	}
 
-	pub fn get_update_fulfill_htlc_and_commit(&mut self, payment_preimage: [u8; 32]) -> Result<Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>, HandleError> {
+	pub fn get_update_fulfill_htlc_and_commit(&mut self, payment_preimage: [u8; 32]) -> Result<Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
 		match self.get_update_fulfill_htlc(payment_preimage)? {
-			Some(update_fulfill_htlc) =>
-				Ok(Some((update_fulfill_htlc, self.send_commitment_no_status_check()?))),
+			Some(update_fulfill_htlc) => {
+				let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
+				Ok(Some((update_fulfill_htlc.0, commitment, monitor_update)))
+			},
 			None => Ok(None)
 		}
 	}
 
 	pub fn get_update_fail_htlc(&mut self, payment_hash_arg: &[u8; 32], err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Was asked to fail an HTLC when channel was not in an operational state", msg: None});
+			return Err(HandleError{err: "Was asked to fail an HTLC when channel was not in an operational state", action: None});
 		}
 		assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
 
@@ -1026,7 +1009,7 @@ impl Channel {
 				match pending_update {
 					&HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_hash, .. } => {
 						if *payment_hash_arg == *payment_hash {
-							return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
+							return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", action: None});
 						}
 					},
 					&HTLCUpdateAwaitingACK::FailHTLC { ref payment_hash, .. } => {
@@ -1058,14 +1041,14 @@ impl Channel {
 				} else if htlc.state == HTLCState::RemoteAnnounced {
 					panic!("Somehow forwarded HTLC prior to remote revocation!");
 				} else if htlc.state == HTLCState::LocalRemoved || htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
-					return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
+					return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", action: None});
 				} else {
 					panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
 				}
 			}
 		}
 		if htlc_amount_msat == 0 {
-			return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
+			return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", action: None});
 		}
 
 		Ok(Some(msgs::UpdateFailHTLC {
@@ -1075,10 +1058,12 @@ impl Channel {
 		}))
 	}
 
-	pub fn get_update_fail_htlc_and_commit(&mut self, payment_hash: &[u8; 32], err_packet: msgs::OnionErrorPacket) -> Result<Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)>, HandleError> {
+	pub fn get_update_fail_htlc_and_commit(&mut self, payment_hash: &[u8; 32], err_packet: msgs::OnionErrorPacket) -> Result<Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
 		match self.get_update_fail_htlc(payment_hash, err_packet)? {
-			Some(update_fail_htlc) =>
-				Ok(Some((update_fail_htlc, self.send_commitment_no_status_check()?))),
+			Some(update_fail_htlc) => {
+				let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
+				Ok(Some((update_fail_htlc, commitment, monitor_update)))
+			},
 			None => Ok(None)
 		}
 	}
@@ -1088,35 +1073,32 @@ impl Channel {
 	pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
 		// Check sanity of message fields:
 		if !self.channel_outbound {
-			return Err(HandleError{err: "Got an accept_channel message from an inbound peer", msg: None});
+			return Err(HandleError{err: "Got an accept_channel message from an inbound peer", action: None});
 		}
 		if self.channel_state != ChannelState::OurInitSent as u32 {
-			return Err(HandleError{err: "Got an accept_channel message at a strange time", msg: None});
+			return Err(HandleError{err: "Got an accept_channel message at a strange time", action: None});
 		}
 		if msg.dust_limit_satoshis > 21000000 * 100000000 {
-			return Err(HandleError{err: "Peer never wants payout outputs?", msg: None});
-		}
-		if msg.max_htlc_value_in_flight_msat > self.channel_value_satoshis * 1000 {
-			return Err(HandleError{err: "Bogus max_htlc_value_in_flight_satoshis", msg: None});
+			return Err(HandleError{err: "Peer never wants payout outputs?", action: None});
 		}
 		if msg.channel_reserve_satoshis > self.channel_value_satoshis {
-			return Err(HandleError{err: "Bogus channel_reserve_satoshis", msg: None});
+			return Err(HandleError{err: "Bogus channel_reserve_satoshis", action: None});
 		}
 		if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
-			return Err(HandleError{err: "Minimum htlc value is full channel value", msg: None});
+			return Err(HandleError{err: "Minimum htlc value is full channel value", action: None});
 		}
 		//TODO do something with minimum_depth
 		if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
-			return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", msg: None});
+			return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", action: None});
 		}
 		if msg.max_accepted_htlcs < 1 {
-			return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", msg: None});
+			return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", action: None});
 		}
 
 		self.channel_monitor.set_their_htlc_base_key(&msg.htlc_basepoint);
 
 		self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
-		self.their_max_htlc_value_in_flight_msat = msg.max_htlc_value_in_flight_msat;
+		self.their_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
 		self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
 		self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
 		self.their_to_self_delay = msg.to_self_delay;
@@ -1130,6 +1112,7 @@ impl Channel {
 
 		let obscure_factor = self.get_commitment_transaction_number_obscure_factor();
 		self.channel_monitor.set_commitment_obscure_factor(obscure_factor);
+		self.channel_monitor.set_their_to_self_delay(msg.to_self_delay);
 
 		self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
 
@@ -1154,21 +1137,23 @@ impl Channel {
 		Ok((remote_initial_commitment_tx, self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap()))
 	}
 
-	pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
+	pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor), HandleError> {
 		if self.channel_outbound {
-			return Err(HandleError{err: "Received funding_created for an outbound channel?", msg: None});
+			return Err(HandleError{err: "Received funding_created for an outbound channel?", action: None});
 		}
 		if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
-			return Err(HandleError{err: "Received funding_created after we got the channel!", msg: None});
+			return Err(HandleError{err: "Received funding_created after we got the channel!", action: None});
 		}
 		if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
 			panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
 		}
 
-		self.channel_monitor.set_funding_info(msg.funding_txid, msg.funding_output_index);
+		let funding_txo = OutPoint::new(msg.funding_txid, msg.funding_output_index);
+		let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
+		self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
 
 		let (remote_initial_commitment_tx, our_signature) = match self.funding_created_signature(&msg.signature) {
-			Ok((remote_initial_commitment_tx, sig)) => (remote_initial_commitment_tx, sig),
+			Ok(res) => res,
 			Err(e) => {
 				self.channel_monitor.unset_funding_info();
 				return Err(e);
@@ -1177,44 +1162,47 @@ impl Channel {
 
 		// Now that we're past error-generating stuff, update our local state:
 
-		//TODO: Determine which tx index in remote_initial_commitment_transaction's outputs
-		//represent a revokeable script!
-		self.channel_monitor.provide_tx_info(&remote_initial_commitment_tx, 0, Vec::new());
+		self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
 		self.channel_state = ChannelState::FundingSent as u32;
-		let funding_txo = self.channel_monitor.get_funding_txo().unwrap();
-		self.channel_id = funding_txo.0.into_be() ^ Uint256::from_u64(funding_txo.1 as u64).unwrap(); //TODO: or le?
+		self.channel_id = funding_txo.to_channel_id();
+		self.cur_remote_commitment_transaction_number -= 1;
+		self.cur_local_commitment_transaction_number -= 1;
 
-		Ok(msgs::FundingSigned {
+		Ok((msgs::FundingSigned {
 			channel_id: self.channel_id,
 			signature: our_signature
-		})
+		}, self.channel_monitor.clone()))
 	}
 
 	/// Handles a funding_signed message from the remote end.
 	/// If this call is successful, broadcast the funding transaction (and not before!)
-	pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
+	pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitor, HandleError> {
 		if !self.channel_outbound {
-			return Err(HandleError{err: "Received funding_signed for an inbound channel?", msg: None});
+			return Err(HandleError{err: "Received funding_signed for an inbound channel?", action: None});
 		}
 		if self.channel_state != ChannelState::FundingCreated as u32 {
-			return Err(HandleError{err: "Received funding_signed in strange state!", msg: None});
+			return Err(HandleError{err: "Received funding_signed in strange state!", action: None});
 		}
-		if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
+		if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 2 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
 			panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
 		}
 
 		let funding_script = self.get_funding_redeemscript();
 
 		let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
-		let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
+		let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
 		let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
 
 		// They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
 		secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey), "Invalid funding_signed signature from peer");
 
+		self.sign_commitment_transaction(&mut local_initial_commitment_tx, &msg.signature);
+		self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), local_keys, self.feerate_per_kw, Vec::new());
+		self.last_local_commitment_txn = vec![local_initial_commitment_tx];
 		self.channel_state = ChannelState::FundingSent as u32;
+		self.cur_local_commitment_transaction_number -= 1;
 
-		Ok(())
+		Ok(self.channel_monitor.clone())
 	}
 
 	pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), HandleError> {
@@ -1223,17 +1211,12 @@ impl Channel {
 			self.channel_state |= ChannelState::TheirFundingLocked as u32;
 		} else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
 			self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
+			self.channel_update_count += 1;
 		} else {
-			return Err(HandleError{err: "Peer sent a funding_locked at a strange time", msg: None});
+			return Err(HandleError{err: "Peer sent a funding_locked at a strange time", action: None});
 		}
 
-		//TODO: Note that this must be a duplicate of the previous commitment point they sent us,
-		//as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
-		//they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
-		//a protocol oversight, but I assume I'm just missing something.
-		if self.their_cur_commitment_point != msg.next_per_commitment_point {
-			return Err(HandleError{err: "Non-duplicate next_per_commitment_point in funding_locked", msg: None});
-		}
+		self.their_prev_commitment_point = Some(self.their_cur_commitment_point);
 		self.their_cur_commitment_point = msg.next_per_commitment_point;
 		Ok(())
 	}
@@ -1256,11 +1239,11 @@ impl Channel {
 				HTLCState::AwaitingAnnouncedRemoteRevoke => {},
 				HTLCState::LocalAnnounced => { if for_remote_update_check { continue; } },
 				HTLCState::Committed => {},
-				HTLCState::RemoteRemoved =>  { if for_remote_update_check { continue; } },
-				HTLCState::AwaitingRemoteRevokeToRemove =>  { if for_remote_update_check { continue; } },
-				HTLCState::AwaitingRemovedRemoteRevoke =>  { if for_remote_update_check { continue; } },
-				HTLCState::LocalRemoved =>  {},
-				HTLCState::LocalRemovedAwaitingCommitment =>  { if for_remote_update_check { continue; } },
+				HTLCState::RemoteRemoved => { if for_remote_update_check { continue; } },
+				HTLCState::AwaitingRemoteRevokeToRemove => { if for_remote_update_check { continue; } },
+				HTLCState::AwaitingRemovedRemoteRevoke => { if for_remote_update_check { continue; } },
+				HTLCState::LocalRemoved => {},
+				HTLCState::LocalRemovedAwaitingCommitment => { if for_remote_update_check { continue; } },
 			}
 			if !htlc.outbound {
 				inbound_htlc_count += 1;
@@ -1275,35 +1258,35 @@ impl Channel {
 
 	pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingForwardHTLCInfo) -> Result<(), HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
+			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
 		}
 		if msg.amount_msat > self.channel_value_satoshis * 1000 {
-			return Err(HandleError{err: "Remote side tried to send more than the total value of the channel", msg: None});
+			return Err(HandleError{err: "Remote side tried to send more than the total value of the channel", action: None});
 		}
 		if msg.amount_msat < self.our_htlc_minimum_msat {
-			return Err(HandleError{err: "Remote side tried to send less than our minimum HTLC value", msg: None});
+			return Err(HandleError{err: "Remote side tried to send less than our minimum HTLC value", action: None});
 		}
 
 		let (inbound_htlc_count, _, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(true);
 		if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
-			return Err(HandleError{err: "Remote tried to push more than our max accepted HTLCs", msg: None});
+			return Err(HandleError{err: "Remote tried to push more than our max accepted HTLCs", action: None});
 		}
 		//TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
 		// Check our_max_htlc_value_in_flight_msat
 		if htlc_inbound_value_msat + msg.amount_msat > Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
-			return Err(HandleError{err: "Remote HTLC add would put them over their max HTLC value in flight", msg: None});
+			return Err(HandleError{err: "Remote HTLC add would put them over their max HTLC value in flight", action: None});
 		}
 		// Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
 		// the reserve_satoshis we told them to always have as direct payment so that they lose
 		// something if we punish them for broadcasting an old state).
 		if htlc_inbound_value_msat + htlc_outbound_value_msat + msg.amount_msat + self.value_to_self_msat > (self.channel_value_satoshis - Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis)) * 1000 {
-			return Err(HandleError{err: "Remote HTLC add would put them over their reserve value", msg: None});
+			return Err(HandleError{err: "Remote HTLC add would put them over their reserve value", action: None});
 		}
 		if self.next_remote_htlc_id != msg.htlc_id {
-			return Err(HandleError{err: "Remote skipped HTLC ID", msg: None});
+			return Err(HandleError{err: "Remote skipped HTLC ID", action: None});
 		}
 		if msg.cltv_expiry >= 500000000 {
-			return Err(HandleError{err: "Remote provided CLTV expiry in seconds instead of block height", msg: None});
+			return Err(HandleError{err: "Remote provided CLTV expiry in seconds instead of block height", action: None});
 		}
 
 		//TODO: Check msg.cltv_expiry further? Do this in channel manager?
@@ -1326,35 +1309,36 @@ impl Channel {
 	}
 
 	/// Removes an outbound HTLC which has been commitment_signed by the remote end
-	fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<(), HandleError> {
-		for mut htlc in self.pending_htlcs.iter_mut() {
+	#[inline]
+	fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<[u8; 32], HandleError> {
+		for htlc in self.pending_htlcs.iter_mut() {
 			if htlc.outbound && htlc.htlc_id == htlc_id {
 				match check_preimage {
 					None => {},
 					Some(payment_hash) =>
 						if payment_hash != htlc.payment_hash {
-							return Err(HandleError{err: "Remote tried to fulfill HTLC with an incorrect preimage", msg: None});
+							return Err(HandleError{err: "Remote tried to fulfill HTLC with an incorrect preimage", action: None});
 						}
 				};
 				if htlc.state == HTLCState::LocalAnnounced {
-					return Err(HandleError{err: "Remote tried to fulfill HTLC before it had been committed", msg: None});
+					return Err(HandleError{err: "Remote tried to fulfill HTLC before it had been committed", action: None});
 				} else if htlc.state == HTLCState::Committed {
 					htlc.state = HTLCState::RemoteRemoved;
 					htlc.fail_reason = fail_reason;
 				} else if htlc.state == HTLCState::AwaitingRemoteRevokeToRemove || htlc.state == HTLCState::AwaitingRemovedRemoteRevoke || htlc.state == HTLCState::RemoteRemoved {
-					return Err(HandleError{err: "Remote tried to fulfill HTLC that they'd already fulfilled", msg: None});
+					return Err(HandleError{err: "Remote tried to fulfill HTLC that they'd already fulfilled", action: None});
 				} else {
 					panic!("Got a non-outbound state on an outbound HTLC");
 				}
-				return Ok(());
+				return Ok(htlc.payment_hash.clone());
 			}
 		}
-		Err(HandleError{err: "Remote tried to fulfill/fail an HTLC we couldn't find", msg: None})
+		Err(HandleError{err: "Remote tried to fulfill/fail an HTLC we couldn't find", action: None})
 	}
 
-	pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
+	pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<ChannelMonitor, HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
+			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
 		}
 
 		let mut sha = Sha256::new();
@@ -1362,13 +1346,14 @@ impl Channel {
 		let mut payment_hash = [0; 32];
 		sha.result(&mut payment_hash);
 
-		self.channel_monitor.provide_payment_preimage(&msg.payment_preimage);
-		self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None)
+		self.channel_monitor.provide_payment_preimage(&payment_hash, &msg.payment_preimage);
+		self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None)?;
+		Ok(self.channel_monitor.clone())
 	}
 
-	pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<(), HandleError> {
+	pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<[u8; 32], HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
+			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
 		}
 
 		self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
@@ -1376,42 +1361,55 @@ impl Channel {
 
 	pub fn update_fail_malformed_htlc(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<(), HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
+			return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
 		}
 
-		self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
+		self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
+		Ok(())
 	}
 
-	pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
+	pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitor), HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Got commitment signed message when channel was not in an operational state", msg: None});
+			return Err(HandleError{err: "Got commitment signed message when channel was not in an operational state", action: None});
 		}
 
 		let funding_script = self.get_funding_redeemscript();
 
 		let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
-		let local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false);
+		let mut local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false);
 		let local_commitment_txid = local_commitment_tx.0.txid();
 		let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_commitment_tx.0).sighash_all(&local_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
 		secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey), "Invalid commitment tx signature from peer");
 
 		if msg.htlc_signatures.len() != local_commitment_tx.1.len() {
-			return Err(HandleError{err: "Got wrong number of HTLC signatures from remote", msg: None});
+			return Err(HandleError{err: "Got wrong number of HTLC signatures from remote", action: None});
 		}
 
+		let mut new_local_commitment_txn = Vec::with_capacity(local_commitment_tx.1.len() + 1);
+		self.sign_commitment_transaction(&mut local_commitment_tx.0, &msg.signature);
+		new_local_commitment_txn.push(local_commitment_tx.0.clone());
+
+		let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.1.len());
 		for (idx, ref htlc) in local_commitment_tx.1.iter().enumerate() {
-			let htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys);
+			let mut htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys);
 			let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
 			let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
 			secp_call!(self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &local_keys.b_htlc_key), "Invalid HTLC tx siganture from peer");
+			let htlc_sig = if htlc.offered {
+				let htlc_sig = self.sign_htlc_transaction(&mut htlc_tx, &msg.htlc_signatures[idx], &None, htlc, &local_keys)?;
+				new_local_commitment_txn.push(htlc_tx);
+				htlc_sig
+			} else {
+				self.create_htlc_tx_signature(&htlc_tx, htlc, &local_keys)?.1
+			};
+			htlcs_and_sigs.push(((*htlc).clone(), msg.htlc_signatures[idx], htlc_sig));
 		}
 
 		let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1)).unwrap();
-		let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number);
-
-		//TODO: Store htlc keys in our channel_watcher
+		let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 1);
 
 		// Update state now that we've passed all the can-fail calls...
+		self.channel_monitor.provide_latest_local_commitment_tx_info(local_commitment_tx.0, local_keys, self.feerate_per_kw, htlcs_and_sigs);
 
 		let mut need_our_commitment = false;
 		for htlc in self.pending_htlcs.iter_mut() {
@@ -1435,24 +1433,26 @@ impl Channel {
 		self.value_to_self_msat += claimed_value_msat;
 
 		self.cur_local_commitment_transaction_number -= 1;
+		self.last_local_commitment_txn = new_local_commitment_txn;
 
-		let our_commitment_signed = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
+		let (our_commitment_signed, monitor_update) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
 			// If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
 			// we'll send one right away when we get the revoke_and_ack when we
 			// free_holding_cell_htlcs().
-			Some(self.send_commitment_no_status_check()?)
-		} else { None };
+			let (msg, monitor) = self.send_commitment_no_status_check()?;
+			(Some(msg), monitor)
+		} else { (None, self.channel_monitor.clone()) };
 
 		Ok((msgs::RevokeAndACK {
 			channel_id: self.channel_id,
 			per_commitment_secret: per_commitment_secret,
 			next_per_commitment_point: next_per_commitment_point,
-		}, our_commitment_signed))
+		}, our_commitment_signed, monitor_update))
 	}
 
 	/// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
 	/// fulfilling or failing the last pending HTLC)
-	fn free_holding_cell_htlcs(&mut self) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
+	fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitor)>, HandleError> {
 		if self.holding_cell_htlc_updates.len() != 0 {
 			let mut htlc_updates = Vec::new();
 			mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
@@ -1480,7 +1480,7 @@ impl Channel {
 						},
 						&HTLCUpdateAwaitingACK::ClaimHTLC { payment_preimage, .. } => {
 							match self.get_update_fulfill_htlc(payment_preimage) {
-								Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap()),
+								Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap().0),
 								Err(e) => {
 									err = Some(e);
 								}
@@ -1504,12 +1504,13 @@ impl Channel {
 			//fail it back the route, if its a temporary issue we can ignore it...
 			match err {
 				None => {
-					Ok(Some(msgs::CommitmentUpdate {
+					let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
+					Ok(Some((msgs::CommitmentUpdate {
 						update_add_htlcs,
 						update_fulfill_htlcs,
 						update_fail_htlcs,
-						commitment_signed: self.send_commitment_no_status_check()?
-					}))
+						commitment_signed,
+					}, monitor_update)))
 				},
 				Some(e) => Err(e)
 			}
@@ -1523,20 +1524,23 @@ impl Channel {
 	/// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
 	/// generating an appropriate error *after* the channel state has been updated based on the
 	/// revoke_and_ack message.
-	pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK) -> Result<(Option<msgs::CommitmentUpdate>, Vec<PendingForwardHTLCInfo>, Vec<([u8; 32], HTLCFailReason)>), HandleError> {
+	pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK) -> Result<(Option<msgs::CommitmentUpdate>, Vec<PendingForwardHTLCInfo>, Vec<([u8; 32], HTLCFailReason)>, ChannelMonitor), HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Got revoke/ACK message when channel was not in an operational state", msg: None});
+			return Err(HandleError{err: "Got revoke/ACK message when channel was not in an operational state", action: None});
 		}
-		if PublicKey::from_secret_key(&self.secp_ctx, &secp_call!(SecretKey::from_slice(&self.secp_ctx, &msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret")).unwrap() != self.their_cur_commitment_point {
-			return Err(HandleError{err: "Got a revoke commitment secret which didn't correspond to their current pubkey", msg: None});
+		if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
+			if PublicKey::from_secret_key(&self.secp_ctx, &secp_call!(SecretKey::from_slice(&self.secp_ctx, &msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret")).unwrap() != their_prev_commitment_point {
+				return Err(HandleError{err: "Got a revoke commitment secret which didn't correspond to their current pubkey", action: None});
+			}
 		}
-		self.channel_monitor.provide_secret(self.cur_remote_commitment_transaction_number, msg.per_commitment_secret)?;
+		self.channel_monitor.provide_secret(self.cur_remote_commitment_transaction_number + 1, msg.per_commitment_secret, Some((self.cur_remote_commitment_transaction_number - 1, msg.next_per_commitment_point)))?;
 
 		// Update state now that we've passed all the can-fail calls...
 		// (note that we may still fail to generate the new commitment_signed message, but that's
 		// OK, we step the channel here and *then* if the new generation fails we can fail the
 		// channel based on that, but stepping stuff here should be safe either way.
 		self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
+		self.their_prev_commitment_point = Some(self.their_cur_commitment_point);
 		self.their_cur_commitment_point = msg.next_per_commitment_point;
 		self.cur_remote_commitment_transaction_number -= 1;
 
@@ -1579,18 +1583,19 @@ impl Channel {
 
 		match self.free_holding_cell_htlcs()? {
 			Some(commitment_update) => {
-				Ok((Some(commitment_update), to_forward_infos, revoked_htlcs))
+				Ok((Some(commitment_update.0), to_forward_infos, revoked_htlcs, commitment_update.1))
 			},
 			None => {
 				if require_commitment {
+					let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
 					Ok((Some(msgs::CommitmentUpdate {
 						update_add_htlcs: Vec::new(),
 						update_fulfill_htlcs: Vec::new(),
 						update_fail_htlcs: Vec::new(),
-						commitment_signed: self.send_commitment_no_status_check()?
-					}), to_forward_infos, revoked_htlcs))
+						commitment_signed
+					}), to_forward_infos, revoked_htlcs, monitor_update))
 				} else {
-					Ok((None, to_forward_infos, revoked_htlcs))
+					Ok((None, to_forward_infos, revoked_htlcs, self.channel_monitor.clone()))
 				}
 			}
 		}
@@ -1598,9 +1603,10 @@ impl Channel {
 
 	pub fn update_fee(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
 		if self.channel_outbound {
-			return Err(HandleError{err: "Non-funding remote tried to update channel fee", msg: None});
+			return Err(HandleError{err: "Non-funding remote tried to update channel fee", action: None});
 		}
 		Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
+		self.channel_update_count += 1;
 		self.feerate_per_kw = msg.feerate_per_kw as u64;
 		Ok(())
 	}
@@ -1608,28 +1614,29 @@ impl Channel {
 	pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<[u8; 32]>), HandleError> {
 		if self.channel_state < ChannelState::FundingSent as u32 {
 			self.channel_state = ChannelState::ShutdownComplete as u32;
+			self.channel_update_count += 1;
 			return Ok((None, None, Vec::new()));
 		}
 		for htlc in self.pending_htlcs.iter() {
 			if htlc.state == HTLCState::RemoteAnnounced {
-				return Err(HandleError{err: "Got shutdown with remote pending HTLCs", msg: None});
+				return Err(HandleError{err: "Got shutdown with remote pending HTLCs", action: None});
 			}
 		}
 		if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
-			return Err(HandleError{err: "Remote peer sent duplicate shutdown message", msg: None});
+			return Err(HandleError{err: "Remote peer sent duplicate shutdown message", action: None});
 		}
 		assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
 
 		// BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
 		// 34 bytes in length, so dont let the remote peer feed us some super fee-heavy script.
 		if self.channel_outbound && msg.scriptpubkey.len() > 34 {
-			return Err(HandleError{err: "Got shutdown_scriptpubkey of absurd length from remote peer", msg: None});
+			return Err(HandleError{err: "Got shutdown_scriptpubkey of absurd length from remote peer", action: None});
 		}
 		//TODO: Check shutdown_scriptpubkey form as BOLT says we must? WHYYY
 
 		if self.their_shutdown_scriptpubkey.is_some() {
 			if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
-				return Err(HandleError{err: "Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey", msg: None});
+				return Err(HandleError{err: "Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey", action: None});
 			}
 		} else {
 			self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
@@ -1655,6 +1662,7 @@ impl Channel {
 		// From here on out, we may not fail!
 
 		self.channel_state |= ChannelState::RemoteShutdownSent as u32;
+		self.channel_update_count += 1;
 
 		// We can't send our shutdown until we've committed all of our pending HTLCs, but the
 		// remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
@@ -1685,6 +1693,7 @@ impl Channel {
 		};
 
 		self.channel_state |= ChannelState::LocalShutdownSent as u32;
+		self.channel_update_count += 1;
 		if self.pending_htlcs.is_empty() && self.channel_outbound {
 			// There are no more HTLCs and we're the funder, this means we start the closing_signed
 			// dance with an initial fee proposal!
@@ -1701,19 +1710,19 @@ impl Channel {
 
 	pub fn closing_signed(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), HandleError> {
 		if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
-			return Err(HandleError{err: "Remote end sent us a closing_signed before both sides provided a shutdown", msg: None});
+			return Err(HandleError{err: "Remote end sent us a closing_signed before both sides provided a shutdown", action: None});
 		}
 		if !self.pending_htlcs.is_empty() {
-			return Err(HandleError{err: "Remote end sent us a closing_signed while there were still pending HTLCs", msg: None});
+			return Err(HandleError{err: "Remote end sent us a closing_signed while there were still pending HTLCs", action: None});
 		}
 		if msg.fee_satoshis > 21000000 * 10000000 {
-			return Err(HandleError{err: "Remote tried to send us a closing tx with > 21 million BTC fee", msg: None});
+			return Err(HandleError{err: "Remote tried to send us a closing tx with > 21 million BTC fee", action: None});
 		}
 
 		let funding_redeemscript = self.get_funding_redeemscript();
 		let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
 		if used_total_fee != msg.fee_satoshis {
-			return Err(HandleError{err: "Remote sent us a closing_signed with a fee greater than the value they can claim", msg: None});
+			return Err(HandleError{err: "Remote sent us a closing_signed with a fee greater than the value they can claim", action: None});
 		}
 		let mut sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
 
@@ -1732,6 +1741,7 @@ impl Channel {
 			if last_fee == msg.fee_satoshis {
 				self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
 				self.channel_state = ChannelState::ShutdownComplete as u32;
+				self.channel_update_count += 1;
 				return Ok((None, Some(closing_tx)));
 			}
 		}
@@ -1757,7 +1767,7 @@ impl Channel {
 			if proposed_sat_per_vbyte > our_max_feerate {
 				if let Some((last_feerate, _)) = self.last_sent_closing_fee {
 					if our_max_feerate <= last_feerate {
-						return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate", msg: None});
+						return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate", action: None});
 					}
 				}
 				propose_new_feerate!(our_max_feerate);
@@ -1767,7 +1777,7 @@ impl Channel {
 			if proposed_sat_per_vbyte < our_min_feerate {
 				if let Some((last_feerate, _)) = self.last_sent_closing_fee {
 					if our_min_feerate >= last_feerate {
-						return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate", msg: None});
+						return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate", action: None});
 					}
 				}
 				propose_new_feerate!(our_min_feerate);
@@ -1776,6 +1786,7 @@ impl Channel {
 
 		let our_sig = self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
 		self.channel_state = ChannelState::ShutdownComplete as u32;
+		self.channel_update_count += 1;
 
 		Ok((Some(msgs::ClosingSigned {
 			channel_id: self.channel_id,
@@ -1786,7 +1797,7 @@ impl Channel {
 
 	// Public utilities:
 
-	pub fn channel_id(&self) -> Uint256 {
+	pub fn channel_id(&self) -> [u8; 32] {
 		self.channel_id
 	}
 
@@ -1796,6 +1807,13 @@ impl Channel {
 		self.user_id
 	}
 
+	pub fn channel_monitor(&self) -> ChannelMonitor {
+		if self.channel_state < ChannelState::FundingCreated as u32 {
+			panic!("Can't get a channel monitor until funding has been created");
+		}
+		self.channel_monitor.clone()
+	}
+
 	/// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
 	/// is_usable() returns true).
 	pub fn get_short_channel_id(&self) -> Option<u64> {
@@ -1804,7 +1822,7 @@ impl Channel {
 
 	/// Returns the funding_txo we either got from our peer, or were given by
 	/// get_outbound_funding_created.
-	pub fn get_funding_txo(&self) -> Option<(Sha256dHash, u16)> {
+	pub fn get_funding_txo(&self) -> Option<OutPoint> {
 		self.channel_monitor.get_funding_txo()
 	}
 
@@ -1820,11 +1838,14 @@ impl Channel {
 		self.channel_value_satoshis
 	}
 
-	pub fn get_channel_update_count(&mut self) -> u32 {
-		self.channel_update_count += 1; //TODO: This should be base on updates, not updates *sent*
+	pub fn get_channel_update_count(&self) -> u32 {
 		self.channel_update_count
 	}
 
+	pub fn should_announce(&self) -> bool {
+		self.announce_publicly
+	}
+
 	/// Gets the fee we'd want to charge for adding an HTLC output to this Channel
 	pub fn get_our_fee_base_msat(&self, fee_estimator: &FeeEstimator) -> u32 {
 		// For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
@@ -1844,13 +1865,6 @@ impl Channel {
 		res as u32
 	}
 
-	pub fn channel_monitor(&self) -> ChannelMonitor {
-		if self.channel_state < ChannelState::FundingCreated as u32 {
-			panic!("Can't get a channel monitor until funding has been created");
-		}
-		self.channel_monitor.clone()
-	}
-
 	/// Returns true if this channel is fully established and not known to be closing.
 	pub fn is_usable(&self) -> bool {
 		let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
@@ -1887,6 +1901,7 @@ impl Channel {
 						self.channel_state |= ChannelState::OurFundingLocked as u32;
 					} else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
 						self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
+						self.channel_update_count += 1;
 						//TODO: Something about a state where we "lost confirmation"
 					} else if self.channel_state < ChannelState::ChannelFunded as u32 {
 						panic!("Started confirming a channel in a state pre-FundingSent?");
@@ -1908,16 +1923,17 @@ impl Channel {
 		}
 		if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
 			for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
-				if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().0 {
-					let txo_idx = self.channel_monitor.get_funding_txo().unwrap().1 as usize;
+				if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().txid {
+					let txo_idx = self.channel_monitor.get_funding_txo().unwrap().index as usize;
 					if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
 						tx.output[txo_idx].value != self.channel_value_satoshis {
 						self.channel_state = ChannelState::ShutdownComplete as u32;
+						self.channel_update_count += 1;
 					} else {
 						self.funding_tx_confirmations = 1;
 						self.short_channel_id = Some(((height as u64)          << (5*8)) |
 						                             ((*index_in_block as u64) << (2*8)) |
-						                             ((self.channel_monitor.get_funding_txo().unwrap().1 as u64) << (2*8)));
+						                             ((txo_idx as u64)         << (0*8)));
 					}
 				}
 			}
@@ -1949,7 +1965,7 @@ impl Channel {
 			panic!("Tried to open a channel for an inbound channel?");
 		}
 		if self.channel_state != ChannelState::OurInitSent as u32 {
-			return Err(HandleError{err: "Cannot generate an open_channel after we've moved forward", msg: None});
+			return Err(HandleError{err: "Cannot generate an open_channel after we've moved forward", action: None});
 		}
 
 		if self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
@@ -2013,7 +2029,7 @@ impl Channel {
 		})
 	}
 
-	fn get_outbound_funding_created_signature(&mut self) -> Result<Signature, HandleError> {
+	fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), HandleError> {
 		let funding_script = self.get_funding_redeemscript();
 
 		let remote_keys = self.build_remote_transaction_keys()?;
@@ -2021,7 +2037,7 @@ impl Channel {
 		let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_initial_commitment_tx).sighash_all(&remote_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
 
 		// We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
-		Ok(self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap())
+		Ok((self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap(), remote_initial_commitment_tx))
 	}
 
 	/// Updates channel state with knowledge of the funding transaction's txid/index, and generates
@@ -2030,7 +2046,7 @@ impl Channel {
 	/// or if called on an inbound channel.
 	/// Note that channel_id changes during this call!
 	/// Do NOT broadcast the funding transaction until after a successful funding_signed call!
-	pub fn get_outbound_funding_created(&mut self, funding_txid: Sha256dHash, funding_output_index: u16) -> Result<msgs::FundingCreated, HandleError> {
+	pub fn get_outbound_funding_created(&mut self, funding_txo: OutPoint) -> Result<(msgs::FundingCreated, ChannelMonitor), HandleError> {
 		if !self.channel_outbound {
 			panic!("Tried to create outbound funding_created message on an inbound channel!");
 		}
@@ -2041,10 +2057,11 @@ impl Channel {
 			panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
 		}
 
-		self.channel_monitor.set_funding_info(funding_txid, funding_output_index);
+		let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
+		self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
 
-		let our_signature = match self.get_outbound_funding_created_signature() {
-			Ok(sig) => sig,
+		let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
+			Ok(res) => res,
 			Err(e) => {
 				self.channel_monitor.unset_funding_info();
 				return Err(e);
@@ -2054,17 +2071,17 @@ impl Channel {
 		let temporary_channel_id = self.channel_id;
 
 		// Now that we're past error-generating stuff, update our local state:
-
+		self.channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
 		self.channel_state = ChannelState::FundingCreated as u32;
-		let funding_txo = self.channel_monitor.get_funding_txo().unwrap();
-		self.channel_id = funding_txo.0.into_be() ^ Uint256::from_u64(funding_txo.1 as u64).unwrap(); //TODO: or le?
+		self.channel_id = funding_txo.to_channel_id();
+		self.cur_remote_commitment_transaction_number -= 1;
 
-		Ok(msgs::FundingCreated {
+		Ok((msgs::FundingCreated {
 			temporary_channel_id: temporary_channel_id,
-			funding_txid: funding_txid,
-			funding_output_index: funding_output_index,
+			funding_txid: funding_txo.txid,
+			funding_output_index: funding_txo.index,
 			signature: our_signature
-		})
+		}, self.channel_monitor.clone()))
 	}
 
 	/// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
@@ -2076,10 +2093,10 @@ impl Channel {
 	/// message can mark the channel disabled.
 	pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), HandleError> {
 		if !self.announce_publicly {
-			return Err(HandleError{err: "Channel is not available for public announcements", msg: None});
+			return Err(HandleError{err: "Channel is not available for public announcements", action: None});
 		}
 		if self.channel_state & (ChannelState::ChannelFunded as u32) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Cannot get a ChannelAnnouncement until the channel funding has been locked", msg: None});
+			return Err(HandleError{err: "Cannot get a ChannelAnnouncement until the channel funding has been locked", action: None});
 		}
 
 		let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
@@ -2111,28 +2128,28 @@ impl Channel {
 	/// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
 	pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Cannot send HTLC until channel is fully established and we haven't started shutting down", msg: None});
+			return Err(HandleError{err: "Cannot send HTLC until channel is fully established and we haven't started shutting down", action: None});
 		}
 
 		if amount_msat > self.channel_value_satoshis * 1000 {
-			return Err(HandleError{err: "Cannot send more than the total value of the channel", msg: None});
+			return Err(HandleError{err: "Cannot send more than the total value of the channel", action: None});
 		}
 		if amount_msat < self.their_htlc_minimum_msat {
-			return Err(HandleError{err: "Cannot send less than their minimum HTLC value", msg: None});
+			return Err(HandleError{err: "Cannot send less than their minimum HTLC value", action: None});
 		}
 
 		let (_, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(false);
 		if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
-			return Err(HandleError{err: "Cannot push more than their max accepted HTLCs", msg: None});
+			return Err(HandleError{err: "Cannot push more than their max accepted HTLCs", action: None});
 		}
 		//TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
 		// Check their_max_htlc_value_in_flight_msat
 		if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
-			return Err(HandleError{err: "Cannot send value that would put us over our max HTLC value in flight", msg: None});
+			return Err(HandleError{err: "Cannot send value that would put us over our max HTLC value in flight", action: None});
 		}
 		// Check their_channel_reserve_satoshis:
 		if htlc_inbound_value_msat + htlc_outbound_value_msat + amount_msat + (self.channel_value_satoshis * 1000 - self.value_to_self_msat) > (self.channel_value_satoshis - self.their_channel_reserve_satoshis) * 1000 {
-			return Err(HandleError{err: "Cannot send value that would put us over our reserve value", msg: None});
+			return Err(HandleError{err: "Cannot send value that would put us over our reserve value", action: None});
 		}
 
 		//TODO: Check cltv_expiry? Do this in channel manager?
@@ -2176,12 +2193,12 @@ impl Channel {
 	}
 
 	/// Creates a signed commitment transaction to send to the remote peer.
-	pub fn send_commitment(&mut self) -> Result<msgs::CommitmentSigned, HandleError> {
+	pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
 		if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-			return Err(HandleError{err: "Cannot create commitment tx until channel is fully established", msg: None});
+			return Err(HandleError{err: "Cannot create commitment tx until channel is fully established", action: None});
 		}
 		if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
-			return Err(HandleError{err: "Cannot create commitment tx until remote revokes their previous commitment", msg: None});
+			return Err(HandleError{err: "Cannot create commitment tx until remote revokes their previous commitment", action: None});
 		}
 		let mut have_updates = false; // TODO initialize with "have we sent a fee update?"
 		for htlc in self.pending_htlcs.iter() {
@@ -2191,12 +2208,12 @@ impl Channel {
 			if have_updates { break; }
 		}
 		if !have_updates {
-			return Err(HandleError{err: "Cannot create commitment tx until we have some updates to send", msg: None});
+			return Err(HandleError{err: "Cannot create commitment tx until we have some updates to send", action: None});
 		}
 		self.send_commitment_no_status_check()
 	}
 	/// Only fails in case of bad keys
-	fn send_commitment_no_status_check(&mut self) -> Result<msgs::CommitmentSigned, HandleError> {
+	fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
 		let funding_script = self.get_funding_redeemscript();
 
 		// We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
@@ -2227,23 +2244,26 @@ impl Channel {
 		}
 
 		// Update state now that we've passed all the can-fail calls...
+		self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_commitment_tx.0, remote_commitment_tx.1, self.cur_remote_commitment_transaction_number);
 		self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
 
-		Ok(msgs::CommitmentSigned {
+		Ok((msgs::CommitmentSigned {
 			channel_id: self.channel_id,
 			signature: our_sig,
 			htlc_signatures: htlc_sigs,
-		})
+		}, self.channel_monitor.clone()))
 	}
 
 	/// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
 	/// to send to the remote peer in one go.
 	/// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
 	/// more info.
-	pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned)>, HandleError> {
+	pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
 		match self.send_htlc(amount_msat, payment_hash, cltv_expiry, onion_routing_packet)? {
-			Some(update_add_htlc) =>
-				Ok(Some((update_add_htlc, self.send_commitment_no_status_check()?))),
+			Some(update_add_htlc) => {
+				let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
+				Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
+			},
 			None => Ok(None)
 		}
 	}
@@ -2253,11 +2273,11 @@ impl Channel {
 	pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<[u8; 32]>), HandleError> {
 		for htlc in self.pending_htlcs.iter() {
 			if htlc.state == HTLCState::LocalAnnounced {
-				return Err(HandleError{err: "Cannot begin shutdown with pending HTLCs, call send_commitment first", msg: None});
+				return Err(HandleError{err: "Cannot begin shutdown with pending HTLCs, call send_commitment first", action: None});
 			}
 		}
 		if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
-			return Err(HandleError{err: "Shutdown already in progress", msg: None});
+			return Err(HandleError{err: "Shutdown already in progress", action: None});
 		}
 		assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
 
@@ -2269,6 +2289,7 @@ impl Channel {
 		} else {
 			self.channel_state |= ChannelState::LocalShutdownSent as u32;
 		}
+		self.channel_update_count += 1;
 
 		// We can't send our shutdown until we've committed all of our pending HTLCs, but the
 		// remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
@@ -2289,6 +2310,17 @@ impl Channel {
 			scriptpubkey: our_closing_script,
 		}, dropped_outbound_htlcs))
 	}
+
+	/// Gets the latest commitment transaction and any dependant transactions for relay (forcing
+	/// shutdown of this channel - no more calls into this Channel may be made afterwards.
+	pub fn force_shutdown(&mut self) -> Vec<Transaction> {
+		assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
+		self.channel_state = ChannelState::ShutdownComplete as u32;
+		self.channel_update_count += 1;
+		let mut res = Vec::new();
+		mem::swap(&mut res, &mut self.last_local_commitment_txn);
+		res
+	}
 }
 
 #[cfg(test)]
@@ -2297,10 +2329,13 @@ mod tests {
 	use bitcoin::util::hash::Sha256dHash;
 	use bitcoin::util::bip143;
 	use bitcoin::network::serialize::serialize;
+	use bitcoin::blockdata::script::Script;
 	use bitcoin::blockdata::transaction::Transaction;
-	use ln::channel::{Channel,HTLCOutput,HTLCState,HTLCOutputInCommitment,TxCreationKeys};
+	use ln::channel::{Channel,ChannelKeys,HTLCOutput,HTLCState,HTLCOutputInCommitment,TxCreationKeys};
+	use ln::channel::MAX_FUNDING_SATOSHIS;
 	use ln::chan_utils;
 	use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
+	use chain::transaction::OutPoint;
 	use secp256k1::{Secp256k1,Message,Signature};
 	use secp256k1::key::{SecretKey,PublicKey};
 	use crypto::sha2::Sha256;
@@ -2315,26 +2350,39 @@ mod tests {
 		}
 	}
 
+	#[test]
+	fn test_max_funding_satoshis() {
+		assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
+		        "MAX_FUNDING_SATOSHIS is greater than all satoshis on existence");
+	}
+
 	#[test]
 	fn outbound_commitment_test() {
 		// Test vectors from BOLT 3 Appendix C:
 		let feeest = TestFeeEstimator{fee_est: 15000/250};
-		let mut chan = Channel::new_outbound(&feeest, PublicKey::new(), 10000000, false, 42); // Nothing uses their network key in this test
-		chan.their_to_self_delay = 144;
-		chan.our_dust_limit_satoshis = 546;
-
 		let secp_ctx = Secp256k1::new();
 
-		chan.local_keys.funding_key = SecretKey::from_slice(&secp_ctx, &hex_bytes("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap();
-		assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.funding_key).unwrap().serialize()[..],
+		let chan_keys = ChannelKeys {
+			funding_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
+			payment_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
+			delayed_payment_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
+			htlc_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
+
+			// These aren't set in the test vectors:
+			revocation_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
+			channel_close_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
+			channel_monitor_claim_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
+			commitment_seed: [0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff],
+		};
+		assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan_keys.funding_key).unwrap().serialize()[..],
 				hex_bytes("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
 
-		chan.local_keys.payment_base_key = SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap();
-		chan.local_keys.delayed_payment_base_key = SecretKey::from_slice(&secp_ctx, &hex_bytes("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap();
-		chan.local_keys.htlc_base_key = SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap();
-		// chan.local_keys.commitment_seed isn't derived in the test vectors :(
+		let mut chan = Channel::new_outbound(&feeest, chan_keys, PublicKey::new(), 10000000, false, 42); // Nothing uses their network key in this test
+		chan.their_to_self_delay = 144;
+		chan.our_dust_limit_satoshis = 546;
 
-		chan.channel_monitor.set_funding_info(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
+		let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
+		chan.channel_monitor.set_funding_info((funding_info, Script::new()));
 
 		chan.their_payment_basepoint = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex_bytes("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()).unwrap();
 		assert_eq!(chan.their_payment_basepoint.serialize()[..],
@@ -2363,7 +2411,7 @@ mod tests {
 
 		macro_rules! test_commitment {
 			( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr) => {
-				unsigned_tx = chan.build_commitment_transaction(42, &keys, true, false);
+				unsigned_tx = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false);
 				let their_signature = Signature::from_der(&secp_ctx, &hex_bytes($their_sig_hex).unwrap()[..]).unwrap();
 				let sighash = Message::from_slice(&bip143::SighashComponents::new(&unsigned_tx.0).sighash_all(&unsigned_tx.0.input[0], &chan.get_funding_redeemscript(), chan.channel_value_satoshis)[..]).unwrap();
 				secp_ctx.verify(&sighash, &their_signature, &chan.their_funding_pubkey).unwrap();
@@ -2829,21 +2877,21 @@ mod tests {
 		let mut seed = [0; 32];
 		seed[0..32].clone_from_slice(&hex_bytes("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
 		assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
-				hex_bytes("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
+		           hex_bytes("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
 
 		seed[0..32].clone_from_slice(&hex_bytes("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
 		assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
-				hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
+		           hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
 
 		assert_eq!(chan_utils::build_commitment_secret(seed, 0xaaaaaaaaaaa),
-				hex_bytes("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
+		           hex_bytes("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
 
 		assert_eq!(chan_utils::build_commitment_secret(seed, 0x555555555555),
-				hex_bytes("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
+		           hex_bytes("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
 
 		seed[0..32].clone_from_slice(&hex_bytes("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
 		assert_eq!(chan_utils::build_commitment_secret(seed, 1),
-				hex_bytes("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
+		           hex_bytes("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
 	}
 
 	#[test]