From: Dr. Maxim Orlovsky <orlovsky@pandoracore.com>
Date: Mon, 27 Apr 2020 15:53:13 +0000 (+0200)
Subject: Adopting new bitcoin hash types and crate version
X-Git-Tag: v0.0.12~70^2~1
X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=27079e04d7b542058e48cafaf5c2e7114b3b8e15;p=rust-lightning

Adopting new bitcoin hash types and crate version
---

diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 5e3197f8f..115f3e8a4 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -19,11 +19,9 @@ stdin_fuzz = []
 [dependencies]
 afl = { version = "0.4", optional = true }
 lightning = { path = "../lightning", features = ["fuzztarget"] }
-bitcoin = { version = "0.21", features = ["fuzztarget"] }
-bitcoin_hashes = { version = "0.7", features = ["fuzztarget"] }
+bitcoin = { version = "0.23", features = ["fuzztarget"] }
 hex = "0.3"
 honggfuzz = { version = "0.5", optional = true }
-secp256k1 = { version = "0.15", features=["fuzztarget"] }
 libfuzzer-sys = { git = "https://github.com/rust-fuzz/libfuzzer-sys.git", optional = true }
 
 [build-dependencies]
diff --git a/fuzz/src/chanmon_consistency.rs b/fuzz/src/chanmon_consistency.rs
index d458c6b96..8a57c4fc2 100644
--- a/fuzz/src/chanmon_consistency.rs
+++ b/fuzz/src/chanmon_consistency.rs
@@ -19,7 +19,7 @@ use bitcoin::network::constants::Network;
 use bitcoin::hashes::Hash as TraitImport;
 use bitcoin::hashes::hash160::Hash as Hash160;
 use bitcoin::hashes::sha256::Hash as Sha256;
-use bitcoin::hashes::sha256d::Hash as Sha256d;
+use bitcoin::hash_types::BlockHash;
 
 use lightning::chain::chaininterface;
 use lightning::chain::transaction::OutPoint;
@@ -114,7 +114,7 @@ impl channelmonitor::ManyChannelMonitor<EnforcingChannelKeys> for TestChannelMon
 			hash_map::Entry::Occupied(entry) => entry,
 			hash_map::Entry::Vacant(_) => panic!("Didn't have monitor on update call"),
 		};
-		let mut deserialized_monitor = <(Sha256d, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::
+		let mut deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::
 			read(&mut Cursor::new(&map_entry.get().1), Arc::clone(&self.logger)).unwrap().1;
 		deserialized_monitor.update_monitor(update.clone(), &&TestBroadcaster {}).unwrap();
 		let mut ser = VecWriter(Vec::new());
@@ -215,7 +215,7 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 			let mut monitors = HashMap::new();
 			let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 			for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
-				monitors.insert(outpoint, <(Sha256d, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut Cursor::new(&monitor_ser), Arc::clone(&logger)).expect("Failed to read monitor").1);
+				monitors.insert(outpoint, <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut Cursor::new(&monitor_ser), Arc::clone(&logger)).expect("Failed to read monitor").1);
 				monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 			}
 			let mut monitor_refs = HashMap::new();
@@ -233,7 +233,7 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 				channel_monitors: &mut monitor_refs,
 			};
 
-			(<(Sha256d, ChannelManager<EnforcingChannelKeys, Arc<TestChannelMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<FuzzEstimator>>)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, monitor)
+			(<(BlockHash, ChannelManager<EnforcingChannelKeys, Arc<TestChannelMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<FuzzEstimator>>)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, monitor)
 		} }
 	}
 
diff --git a/fuzz/src/chanmon_deser.rs b/fuzz/src/chanmon_deser.rs
index 45da43c0b..52caf36e1 100644
--- a/fuzz/src/chanmon_deser.rs
+++ b/fuzz/src/chanmon_deser.rs
@@ -1,7 +1,7 @@
 // This file is auto-generated by gen_target.sh based on msg_target_template.txt
 // To modify it, modify msg_target_template.txt and run gen_target.sh instead.
 
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::BlockHash;
 
 use lightning::util::enforcing_trait_impls::EnforcingChannelKeys;
 use lightning::ln::channelmonitor;
@@ -26,10 +26,10 @@ impl Writer for VecWriter {
 #[inline]
 pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 	let logger = Arc::new(test_logger::TestLogger::new("".to_owned(), out));
-	if let Ok((latest_block_hash, monitor)) = <(Sha256dHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(&mut Cursor::new(data), logger.clone()) {
+	if let Ok((latest_block_hash, monitor)) = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(&mut Cursor::new(data), logger.clone()) {
 		let mut w = VecWriter(Vec::new());
 		monitor.write_for_disk(&mut w).unwrap();
-		let deserialized_copy = <(Sha256dHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(&mut Cursor::new(&w.0), logger.clone()).unwrap();
+		let deserialized_copy = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(&mut Cursor::new(&w.0), logger.clone()).unwrap();
 		assert!(latest_block_hash == deserialized_copy.0);
 		assert!(monitor == deserialized_copy.1);
 	}
diff --git a/fuzz/src/full_stack.rs b/fuzz/src/full_stack.rs
index 83318abe8..377c9b0d7 100644
--- a/fuzz/src/full_stack.rs
+++ b/fuzz/src/full_stack.rs
@@ -14,9 +14,9 @@ use bitcoin::util::hash::BitcoinHash;
 
 use bitcoin::hashes::Hash as TraitImport;
 use bitcoin::hashes::HashEngine as TraitImportEngine;
-use bitcoin::hashes::sha256::Hash as Sha256;
 use bitcoin::hashes::hash160::Hash as Hash160;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hashes::sha256::Hash as Sha256;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use lightning::chain::chaininterface::{BroadcasterInterface,ConfirmationTarget,ChainListener,FeeEstimator,ChainWatchInterfaceUtil};
 use lightning::chain::transaction::OutPoint;
@@ -38,7 +38,6 @@ use bitcoin::secp256k1::Secp256k1;
 use std::cell::RefCell;
 use std::collections::{HashMap, hash_map};
 use std::cmp;
-use std::hash::Hash;
 use std::sync::Arc;
 use std::sync::atomic::{AtomicU64,AtomicUsize,Ordering};
 
@@ -129,7 +128,7 @@ impl<'a> PartialEq for Peer<'a> {
 	}
 }
 impl<'a> Eq for Peer<'a> {}
-impl<'a> Hash for Peer<'a> {
+impl<'a> std::hash::Hash for Peer<'a> {
 	fn hash<H : std::hash::Hasher>(&self, h: &mut H) {
 		self.id.hash(h)
 	}
@@ -142,8 +141,8 @@ struct MoneyLossDetector<'a> {
 
 	peers: &'a RefCell<[bool; 256]>,
 	funding_txn: Vec<Transaction>,
-	txids_confirmed: HashMap<Sha256dHash, usize>,
-	header_hashes: Vec<Sha256dHash>,
+	txids_confirmed: HashMap<Txid, usize>,
+	header_hashes: Vec<BlockHash>,
 	height: usize,
 	max_height: usize,
 	blocks_connected: u32,
diff --git a/fuzz/src/lib.rs b/fuzz/src/lib.rs
index f87c7511c..dbda28acf 100644
--- a/fuzz/src/lib.rs
+++ b/fuzz/src/lib.rs
@@ -1,7 +1,5 @@
 extern crate bitcoin;
-extern crate bitcoin_hashes;
 extern crate lightning;
-extern crate secp256k1;
 extern crate hex;
 
 pub mod utils;
diff --git a/fuzz/src/router.rs b/fuzz/src/router.rs
index ae164ae2f..2ff160e4e 100644
--- a/fuzz/src/router.rs
+++ b/fuzz/src/router.rs
@@ -1,7 +1,7 @@
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::blockdata::script::{Script, Builder};
 use bitcoin::blockdata::block::Block;
 use bitcoin::blockdata::transaction::Transaction;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use lightning::chain::chaininterface::{ChainError,ChainWatchInterface};
 use lightning::ln::channelmanager::ChannelDetails;
@@ -72,15 +72,15 @@ struct DummyChainWatcher {
 }
 
 impl ChainWatchInterface for DummyChainWatcher {
-	fn install_watch_tx(&self, _txid: &Sha256dHash, _script_pub_key: &Script) { }
-	fn install_watch_outpoint(&self, _outpoint: (Sha256dHash, u32), _out_script: &Script) { }
+	fn install_watch_tx(&self, _txid: &Txid, _script_pub_key: &Script) { }
+	fn install_watch_outpoint(&self, _outpoint: (Txid, u32), _out_script: &Script) { }
 	fn watch_all_txn(&self) { }
 	fn filter_block<'a>(&self, _block: &'a Block) -> (Vec<&'a Transaction>, Vec<u32>) {
 		(Vec::new(), Vec::new())
 	}
 	fn reentered(&self) -> usize { 0 }
 
-	fn get_chain_utxo(&self, _genesis_hash: Sha256dHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
+	fn get_chain_utxo(&self, _genesis_hash: BlockHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
 		match self.input.get_slice(2) {
 			Some(&[0, _]) => Err(ChainError::NotSupported),
 			Some(&[1, _]) => Err(ChainError::NotWatched),
diff --git a/lightning-net-tokio/Cargo.toml b/lightning-net-tokio/Cargo.toml
index 70bc36a18..bdcb91139 100644
--- a/lightning-net-tokio/Cargo.toml
+++ b/lightning-net-tokio/Cargo.toml
@@ -10,7 +10,7 @@ For Rust-Lightning clients which wish to make direct connections to Lightning P2
 """
 
 [dependencies]
-bitcoin = "0.21"
+bitcoin = "0.23"
 lightning = { version = "0.0.11", path = "../lightning" }
 tokio = { version = ">=0.2.12", features = [ "io-util", "macros", "rt-core", "sync", "tcp", "time" ] }
 
diff --git a/lightning/Cargo.toml b/lightning/Cargo.toml
index 3b78a905b..50859aab2 100644
--- a/lightning/Cargo.toml
+++ b/lightning/Cargo.toml
@@ -22,10 +22,10 @@ max_level_info = []
 max_level_debug = []
 
 [dependencies]
-bitcoin = "0.21"
+bitcoin = "0.23"
 
 [dev-dependencies.bitcoin]
-version = "0.21"
+version = "0.23"
 features = ["bitcoinconsensus"]
 
 [dev-dependencies]
diff --git a/lightning/src/chain/chaininterface.rs b/lightning/src/chain/chaininterface.rs
index f49723655..814193af0 100644
--- a/lightning/src/chain/chaininterface.rs
+++ b/lightning/src/chain/chaininterface.rs
@@ -9,8 +9,8 @@ use bitcoin::blockdata::transaction::Transaction;
 use bitcoin::blockdata::script::Script;
 use bitcoin::blockdata::constants::genesis_block;
 use bitcoin::util::hash::BitcoinHash;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::network::constants::Network;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use util::logger::Logger;
 
@@ -40,11 +40,11 @@ pub enum ChainError {
 /// events).
 pub trait ChainWatchInterface: Sync + Send {
 	/// Provides a txid/random-scriptPubKey-in-the-tx which much be watched for.
-	fn install_watch_tx(&self, txid: &Sha256dHash, script_pub_key: &Script);
+	fn install_watch_tx(&self, txid: &Txid, script_pub_key: &Script);
 
 	/// Provides an outpoint which must be watched for, providing any transactions which spend the
 	/// given outpoint.
-	fn install_watch_outpoint(&self, outpoint: (Sha256dHash, u32), out_script: &Script);
+	fn install_watch_outpoint(&self, outpoint: (Txid, u32), out_script: &Script);
 
 	/// Indicates that a listener needs to see all transactions.
 	fn watch_all_txn(&self);
@@ -53,7 +53,7 @@ pub trait ChainWatchInterface: Sync + Send {
 	/// short_channel_id (aka unspent_tx_output_identier). For BTC/tBTC channels the top three
 	/// bytes are the block height, the next 3 the transaction index within the block, and the
 	/// final two the output within the transaction.
-	fn get_chain_utxo(&self, genesis_hash: Sha256dHash, unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError>;
+	fn get_chain_utxo(&self, genesis_hash: BlockHash, unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError>;
 
 	/// Gets the list of transactions and transaction indices that the ChainWatchInterface is
 	/// watching for.
@@ -135,11 +135,11 @@ pub struct ChainWatchedUtil {
 	// We are more conservative in matching during testing to ensure everything matches *exactly*,
 	// even though during normal runtime we take more optimized match approaches...
 	#[cfg(test)]
-	watched_txn: HashSet<(Sha256dHash, Script)>,
+	watched_txn: HashSet<(Txid, Script)>,
 	#[cfg(not(test))]
 	watched_txn: HashSet<Script>,
 
-	watched_outpoints: HashSet<(Sha256dHash, u32)>,
+	watched_outpoints: HashSet<(Txid, u32)>,
 }
 
 impl ChainWatchedUtil {
@@ -154,7 +154,7 @@ impl ChainWatchedUtil {
 
 	/// Registers a tx for monitoring, returning true if it was a new tx and false if we'd already
 	/// been watching for it.
-	pub fn register_tx(&mut self, txid: &Sha256dHash, script_pub_key: &Script) -> bool {
+	pub fn register_tx(&mut self, txid: &Txid, script_pub_key: &Script) -> bool {
 		if self.watch_all { return false; }
 		#[cfg(test)]
 		{
@@ -169,7 +169,7 @@ impl ChainWatchedUtil {
 
 	/// Registers an outpoint for monitoring, returning true if it was a new outpoint and false if
 	/// we'd already been watching for it
-	pub fn register_outpoint(&mut self, outpoint: (Sha256dHash, u32), _script_pub_key: &Script) -> bool {
+	pub fn register_outpoint(&mut self, outpoint: (Txid, u32), _script_pub_key: &Script) -> bool {
 		if self.watch_all { return false; }
 		self.watched_outpoints.insert(outpoint)
 	}
@@ -332,14 +332,14 @@ impl PartialEq for ChainWatchInterfaceUtil {
 
 /// Register listener
 impl ChainWatchInterface for ChainWatchInterfaceUtil {
-	fn install_watch_tx(&self, txid: &Sha256dHash, script_pub_key: &Script) {
+	fn install_watch_tx(&self, txid: &Txid, script_pub_key: &Script) {
 		let mut watched = self.watched.lock().unwrap();
 		if watched.register_tx(txid, script_pub_key) {
 			self.reentered.fetch_add(1, Ordering::Relaxed);
 		}
 	}
 
-	fn install_watch_outpoint(&self, outpoint: (Sha256dHash, u32), out_script: &Script) {
+	fn install_watch_outpoint(&self, outpoint: (Txid, u32), out_script: &Script) {
 		let mut watched = self.watched.lock().unwrap();
 		if watched.register_outpoint(outpoint, out_script) {
 			self.reentered.fetch_add(1, Ordering::Relaxed);
@@ -353,7 +353,7 @@ impl ChainWatchInterface for ChainWatchInterfaceUtil {
 		}
 	}
 
-	fn get_chain_utxo(&self, genesis_hash: Sha256dHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
+	fn get_chain_utxo(&self, genesis_hash: BlockHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
 		if genesis_hash != genesis_block(self.network).header.bitcoin_hash() {
 			return Err(ChainError::NotWatched);
 		}
diff --git a/lightning/src/chain/transaction.rs b/lightning/src/chain/transaction.rs
index df45d786b..33b9c7244 100644
--- a/lightning/src/chain/transaction.rs
+++ b/lightning/src/chain/transaction.rs
@@ -1,6 +1,6 @@
 //! Contains simple structs describing parts of transactions on the chain.
 
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::Txid;
 use bitcoin::blockdata::transaction::OutPoint as BitcoinOutPoint;
 
 /// A reference to a transaction output.
@@ -10,14 +10,14 @@ use bitcoin::blockdata::transaction::OutPoint as BitcoinOutPoint;
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
 pub struct OutPoint {
 	/// The referenced transaction's txid.
-	pub txid: Sha256dHash,
+	pub txid: Txid,
 	/// The index of the referenced output in its transaction's vout.
 	pub index: u16,
 }
 
 impl OutPoint {
 	/// Creates a new `OutPoint` from the txid and the index.
-	pub fn new(txid: Sha256dHash, index: u16) -> OutPoint {
+	pub fn new(txid: Txid, index: u16) -> OutPoint {
 		OutPoint { txid, index }
 	}
 
diff --git a/lightning/src/ln/chan_utils.rs b/lightning/src/ln/chan_utils.rs
index 3ab440d95..d833eca91 100644
--- a/lightning/src/ln/chan_utils.rs
+++ b/lightning/src/ln/chan_utils.rs
@@ -12,7 +12,7 @@ use bitcoin::hashes::{Hash, HashEngine};
 use bitcoin::hashes::sha256::Hash as Sha256;
 use bitcoin::hashes::ripemd160::Hash as Ripemd160;
 use bitcoin::hashes::hash160::Hash as Hash160;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::Txid;
 
 use ln::channelmanager::{PaymentHash, PaymentPreimage};
 use ln::msgs::DecodeError;
@@ -447,7 +447,7 @@ pub fn make_funding_redeemscript(a: &PublicKey, b: &PublicKey) -> Script {
 }
 
 /// panics if htlc.transaction_output_index.is_none()!
-pub fn build_htlc_transaction(prev_hash: &Sha256dHash, feerate_per_kw: u64, to_self_delay: u16, htlc: &HTLCOutputInCommitment, a_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
+pub fn build_htlc_transaction(prev_hash: &Txid, feerate_per_kw: u64, to_self_delay: u16, htlc: &HTLCOutputInCommitment, a_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
 	let mut txins: Vec<TxIn> = Vec::new();
 	txins.push(TxIn {
 		previous_output: OutPoint {
@@ -563,7 +563,7 @@ impl LocalCommitmentTransaction {
 
 	/// Get the txid of the local commitment transaction contained in this
 	/// LocalCommitmentTransaction
-	pub fn txid(&self) -> Sha256dHash {
+	pub fn txid(&self) -> Txid {
 		self.unsigned_tx.txid()
 	}
 
diff --git a/lightning/src/ln/channel.rs b/lightning/src/ln/channel.rs
index e08a7e93f..cfb5e8096 100644
--- a/lightning/src/ln/channel.rs
+++ b/lightning/src/ln/channel.rs
@@ -9,7 +9,7 @@ use bitcoin::consensus::encode;
 use bitcoin::hashes::{Hash, HashEngine};
 use bitcoin::hashes::sha256::Hash as Sha256;
 use bitcoin::hashes::hash160::Hash as Hash160;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use bitcoin::secp256k1::key::{PublicKey,SecretKey};
 use bitcoin::secp256k1::{Secp256k1,Signature};
@@ -313,11 +313,11 @@ pub(super) struct Channel<ChanSigner: ChannelKeys> {
 	/// to detect unconfirmation after a serialize-unserialize roundtrip where we may not see a full
 	/// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
 	/// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
-	funding_tx_confirmed_in: Option<Sha256dHash>,
+	funding_tx_confirmed_in: Option<BlockHash>,
 	short_channel_id: Option<u64>,
 	/// Used to deduplicate block_connected callbacks, also used to verify consistency during
 	/// ChannelManager deserialization (hence pub(super))
-	pub(super) last_block_connected: Sha256dHash,
+	pub(super) last_block_connected: BlockHash,
 	funding_tx_confirmations: u64,
 
 	their_dust_limit_satoshis: u64,
@@ -1133,7 +1133,7 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
 	/// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
 	/// @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, feerate_per_kw: u64) -> Transaction {
+	fn build_htlc_transaction(&self, prev_hash: &Txid, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys, feerate_per_kw: u64) -> Transaction {
 		chan_utils::build_htlc_transaction(prev_hash, feerate_per_kw, if local { self.their_to_self_delay } else { self.our_to_self_delay }, htlc, &keys.a_delayed_payment_key, &keys.revocation_key)
 	}
 
@@ -3299,7 +3299,7 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
 	// Methods to get unprompted messages to send to the remote end (or where we already returned
 	// something in the handler for the message that prompted this message):
 
-	pub fn get_open_channel<F: Deref>(&self, chain_hash: Sha256dHash, fee_estimator: &F) -> msgs::OpenChannel
+	pub fn get_open_channel<F: Deref>(&self, chain_hash: BlockHash, fee_estimator: &F) -> msgs::OpenChannel
 		where F::Target: FeeEstimator
 	{
 		if !self.channel_outbound {
@@ -3431,7 +3431,7 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
 	/// closing).
 	/// Note that the "channel must be funded" requirement is stricter than BOLT 7 requires - see
 	/// https://github.com/lightningnetwork/lightning-rfc/issues/468
-	pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), ChannelError> {
+	pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: BlockHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), ChannelError> {
 		if !self.config.announced_channel {
 			return Err(ChannelError::Ignore("Channel is not available for public announcements"));
 		}
@@ -4310,9 +4310,9 @@ mod tests {
 	use bitcoin::secp256k1::{Secp256k1, Message, Signature, All};
 	use bitcoin::secp256k1::key::{SecretKey,PublicKey};
 	use bitcoin::hashes::sha256::Hash as Sha256;
-	use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 	use bitcoin::hashes::hash160::Hash as Hash160;
 	use bitcoin::hashes::Hash;
+	use bitcoin::hash_types::Txid;
 	use std::sync::Arc;
 	use rand::{thread_rng,Rng};
 
@@ -4457,7 +4457,7 @@ mod tests {
 		chan.their_to_self_delay = 144;
 		chan.our_dust_limit_satoshis = 546;
 
-		let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
+		let funding_info = OutPoint::new(Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
 		chan.funding_txo = Some(funding_info);
 
 		let their_pubkeys = ChannelPublicKeys {
diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs
index 78cf5987a..8d22b8893 100644
--- a/lightning/src/ln/channelmanager.rs
+++ b/lightning/src/ln/channelmanager.rs
@@ -19,6 +19,7 @@ use bitcoin::hashes::hmac::{Hmac, HmacEngine};
 use bitcoin::hashes::sha256::Hash as Sha256;
 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::hashes::cmp::fixed_time_eq;
+use bitcoin::hash_types::BlockHash;
 
 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
 use bitcoin::secp256k1::Secp256k1;
@@ -375,7 +376,7 @@ pub struct ChannelManager<ChanSigner: ChannelKeys, M: Deref, T: Deref, K: Deref,
         F::Target: FeeEstimator,
 {
 	default_configuration: UserConfig,
-	genesis_hash: Sha256dHash,
+	genesis_hash: BlockHash,
 	fee_estimator: F,
 	monitor: M,
 	tx_broadcaster: T,
@@ -384,7 +385,7 @@ pub struct ChannelManager<ChanSigner: ChannelKeys, M: Deref, T: Deref, K: Deref,
 	pub(super) latest_block_height: AtomicUsize,
 	#[cfg(not(test))]
 	latest_block_height: AtomicUsize,
-	last_block_hash: Mutex<Sha256dHash>,
+	last_block_hash: Mutex<BlockHash>,
 	secp_ctx: Secp256k1<secp256k1::All>,
 
 	#[cfg(test)]
@@ -3686,20 +3687,20 @@ pub struct ChannelManagerReadArgs<'a, ChanSigner: 'a + ChannelKeys, M: Deref, T:
 // Implement ReadableArgs for an Arc'd ChannelManager to make it a bit easier to work with the
 // SipmleArcChannelManager type:
 impl<'a, ChanSigner: ChannelKeys + Readable, M: Deref, T: Deref, K: Deref, F: Deref>
-	ReadableArgs<ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>> for (Sha256dHash, Arc<ChannelManager<ChanSigner, M, T, K, F>>)
+	ReadableArgs<ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>> for (BlockHash, Arc<ChannelManager<ChanSigner, M, T, K, F>>)
 	where M::Target: ManyChannelMonitor<ChanSigner>,
         T::Target: BroadcasterInterface,
         K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
         F::Target: FeeEstimator,
 {
 	fn read<R: ::std::io::Read>(reader: &mut R, args: ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>) -> Result<Self, DecodeError> {
-		let (blockhash, chan_manager) = <(Sha256dHash, ChannelManager<ChanSigner, M, T, K, F>)>::read(reader, args)?;
+		let (blockhash, chan_manager) = <(BlockHash, ChannelManager<ChanSigner, M, T, K, F>)>::read(reader, args)?;
 		Ok((blockhash, Arc::new(chan_manager)))
 	}
 }
 
 impl<'a, ChanSigner: ChannelKeys + Readable, M: Deref, T: Deref, K: Deref, F: Deref>
-	ReadableArgs<ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>> for (Sha256dHash, ChannelManager<ChanSigner, M, T, K, F>)
+	ReadableArgs<ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>> for (BlockHash, ChannelManager<ChanSigner, M, T, K, F>)
 	where M::Target: ManyChannelMonitor<ChanSigner>,
         T::Target: BroadcasterInterface,
         K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
@@ -3712,9 +3713,9 @@ impl<'a, ChanSigner: ChannelKeys + Readable, M: Deref, T: Deref, K: Deref, F: De
 			return Err(DecodeError::UnknownVersion);
 		}
 
-		let genesis_hash: Sha256dHash = Readable::read(reader)?;
+		let genesis_hash: BlockHash = Readable::read(reader)?;
 		let latest_block_height: u32 = Readable::read(reader)?;
-		let last_block_hash: Sha256dHash = Readable::read(reader)?;
+		let last_block_hash: BlockHash = Readable::read(reader)?;
 
 		let mut failed_htlcs = Vec::new();
 
diff --git a/lightning/src/ln/channelmonitor.rs b/lightning/src/ln/channelmonitor.rs
index 6bddd302f..edf87da6c 100644
--- a/lightning/src/ln/channelmonitor.rs
+++ b/lightning/src/ln/channelmonitor.rs
@@ -22,7 +22,7 @@ use bitcoin::util::hash::BitcoinHash;
 use bitcoin::hashes::Hash;
 use bitcoin::hashes::sha256::Hash as Sha256;
 use bitcoin::hashes::hash160::Hash as Hash160;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use bitcoin::secp256k1::{Secp256k1,Signature};
 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
@@ -409,7 +409,7 @@ pub(crate) const HTLC_FAIL_BACK_BUFFER: u32 = CLTV_CLAIM_BUFFER + LATENCY_GRACE_
 #[derive(Clone, PartialEq)]
 struct LocalSignedTx {
 	/// txid of the transaction in tx, just used to make comparison faster
-	txid: Sha256dHash,
+	txid: Txid,
 	revocation_key: PublicKey,
 	a_htlc_key: PublicKey,
 	b_htlc_key: PublicKey,
@@ -727,8 +727,8 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
 
 	keys: ChanSigner,
 	funding_info: (OutPoint, Script),
-	current_remote_commitment_txid: Option<Sha256dHash>,
-	prev_remote_commitment_txid: Option<Sha256dHash>,
+	current_remote_commitment_txid: Option<Txid>,
+	prev_remote_commitment_txid: Option<Txid>,
 
 	their_htlc_base_key: PublicKey,
 	their_delayed_payment_base_key: PublicKey,
@@ -741,13 +741,13 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
 	their_to_self_delay: u16,
 
 	commitment_secrets: CounterpartyCommitmentSecrets,
-	remote_claimable_outpoints: HashMap<Sha256dHash, Vec<(HTLCOutputInCommitment, Option<Box<HTLCSource>>)>>,
+	remote_claimable_outpoints: HashMap<Txid, Vec<(HTLCOutputInCommitment, Option<Box<HTLCSource>>)>>,
 	/// We cannot identify HTLC-Success or HTLC-Timeout transactions by themselves on the chain.
 	/// Nor can we figure out their commitment numbers without the commitment transaction they are
 	/// spending. Thus, in order to claim them via revocation key, we track all the remote
 	/// commitment transactions which we find on-chain, mapping them to the commitment number which
 	/// can be used to derive the revocation key and claim the transactions.
-	remote_commitment_txn_on_chain: HashMap<Sha256dHash, (u64, Vec<Script>)>,
+	remote_commitment_txn_on_chain: HashMap<Txid, (u64, Vec<Script>)>,
 	/// Cache used to make pruning of payment_preimages faster.
 	/// Maps payment_hash values to commitment numbers for remote transactions for non-revoked
 	/// remote transactions (ie should remain pretty small).
@@ -782,7 +782,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
 	// interface knows about the TXOs that we want to be notified of spends of. We could probably
 	// be smart and derive them from the above storage fields, but its much simpler and more
 	// Obviously Correct (tm) if we just keep track of them explicitly.
-	outputs_to_watch: HashMap<Sha256dHash, Vec<Script>>,
+	outputs_to_watch: HashMap<Txid, Vec<Script>>,
 
 	#[cfg(test)]
 	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
@@ -804,7 +804,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
 	// (we do *not*, however, update them in update_monitor to ensure any local user copies keep
 	// their last_block_hash from its state and not based on updated copies that didn't run through
 	// the full block_connected).
-	pub(crate) last_block_hash: Sha256dHash,
+	pub(crate) last_block_hash: BlockHash,
 	secp_ctx: Secp256k1<secp256k1::All>, //TODO: dedup this a bit...
 	logger: Arc<Logger>,
 }
@@ -1363,7 +1363,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 
 	/// Gets a list of txids, with their output scripts (in the order they appear in the
 	/// transaction), which we must learn about spends of via block_connected().
-	pub fn get_outputs_to_watch(&self) -> &HashMap<Sha256dHash, Vec<Script>> {
+	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
 		&self.outputs_to_watch
 	}
 
@@ -1371,7 +1371,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 	/// Generally useful when deserializing as during normal operation the return values of
 	/// block_connected are sufficient to ensure all relevant outpoints are being monitored (note
 	/// that the get_funding_txo outpoint and transaction must also be monitored for!).
-	pub fn get_monitored_outpoints(&self) -> Vec<(Sha256dHash, u32, &Script)> {
+	pub fn get_monitored_outpoints(&self) -> Vec<(Txid, u32, &Script)> {
 		let mut res = Vec::with_capacity(self.remote_commitment_txn_on_chain.len() * 2);
 		for (ref txid, &(_, ref outputs)) in self.remote_commitment_txn_on_chain.iter() {
 			for (idx, output) in outputs.iter().enumerate() {
@@ -1424,7 +1424,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 	/// HTLC-Success/HTLC-Timeout transactions.
 	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
 	/// revoked remote commitment tx
-	fn check_spend_remote_transaction(&mut self, tx: &Transaction, height: u32) -> (Vec<ClaimRequest>, (Sha256dHash, Vec<TxOut>)) {
+	fn check_spend_remote_transaction(&mut self, tx: &Transaction, height: u32) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) {
 		// Most secp and related errors trying to create keys means we have no hope of constructing
 		// a spend transaction...so we return no transactions to broadcast
 		let mut claimable_outpoints = Vec::new();
@@ -1637,7 +1637,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 	}
 
 	/// Attempts to claim a remote HTLC-Success/HTLC-Timeout's outputs using the revocation key
-	fn check_spend_remote_htlc(&mut self, tx: &Transaction, commitment_number: u64, height: u32) -> (Vec<ClaimRequest>, Option<(Sha256dHash, Vec<TxOut>)>) {
+	fn check_spend_remote_htlc(&mut self, tx: &Transaction, commitment_number: u64, height: u32) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) {
 		let htlc_txid = tx.txid();
 		if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 			return (Vec::new(), None)
@@ -1699,7 +1699,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
 	/// revoked using data in local_claimable_outpoints.
 	/// Should not be used if check_spend_revoked_transaction succeeds.
-	fn check_spend_local_transaction(&mut self, tx: &Transaction, height: u32) -> (Vec<ClaimRequest>, (Sha256dHash, Vec<TxOut>)) {
+	fn check_spend_local_transaction(&mut self, tx: &Transaction, height: u32) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) {
 		let commitment_txid = tx.txid();
 		let mut claim_requests = Vec::new();
 		let mut watch_outputs = Vec::new();
@@ -1843,7 +1843,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 	/// Eventually this should be pub and, roughly, implement ChainListener, however this requires
 	/// &mut self, as well as returns new spendable outputs and outpoints to watch for spending of
 	/// on-chain.
-	fn block_connected<B: Deref, F: Deref>(&mut self, txn_matched: &[&Transaction], height: u32, block_hash: &Sha256dHash, broadcaster: B, fee_estimator: F)-> Vec<(Sha256dHash, Vec<TxOut>)>
+	fn block_connected<B: Deref, F: Deref>(&mut self, txn_matched: &[&Transaction], height: u32, block_hash: &BlockHash, broadcaster: B, fee_estimator: F)-> Vec<(Txid, Vec<TxOut>)>
 		where B::Target: BroadcasterInterface,
 		      F::Target: FeeEstimator
 	{
@@ -1941,7 +1941,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 		watch_outputs
 	}
 
-	fn block_disconnected<B: Deref, F: Deref>(&mut self, height: u32, block_hash: &Sha256dHash, broadcaster: B, fee_estimator: F)
+	fn block_disconnected<B: Deref, F: Deref>(&mut self, height: u32, block_hash: &BlockHash, broadcaster: B, fee_estimator: F)
 		where B::Target: BroadcasterInterface,
 		      F::Target: FeeEstimator
 	{
@@ -2210,7 +2210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 
 const MAX_ALLOC_SIZE: usize = 64*1024;
 
-impl<ChanSigner: ChannelKeys + Readable> ReadableArgs<Arc<Logger>> for (Sha256dHash, ChannelMonitor<ChanSigner>) {
+impl<ChanSigner: ChannelKeys + Readable> ReadableArgs<Arc<Logger>> for (BlockHash, ChannelMonitor<ChanSigner>) {
 	fn read<R: ::std::io::Read>(reader: &mut R, logger: Arc<Logger>) -> Result<Self, DecodeError> {
 		macro_rules! unwrap_obj {
 			($key: expr) => {
@@ -2307,7 +2307,7 @@ impl<ChanSigner: ChannelKeys + Readable> ReadableArgs<Arc<Logger>> for (Sha256dH
 		let remote_claimable_outpoints_len: u64 = Readable::read(reader)?;
 		let mut remote_claimable_outpoints = HashMap::with_capacity(cmp::min(remote_claimable_outpoints_len as usize, MAX_ALLOC_SIZE / 64));
 		for _ in 0..remote_claimable_outpoints_len {
-			let txid: Sha256dHash = Readable::read(reader)?;
+			let txid: Txid = Readable::read(reader)?;
 			let htlcs_count: u64 = Readable::read(reader)?;
 			let mut htlcs = Vec::with_capacity(cmp::min(htlcs_count as usize, MAX_ALLOC_SIZE / 32));
 			for _ in 0..htlcs_count {
@@ -2321,7 +2321,7 @@ impl<ChanSigner: ChannelKeys + Readable> ReadableArgs<Arc<Logger>> for (Sha256dH
 		let remote_commitment_txn_on_chain_len: u64 = Readable::read(reader)?;
 		let mut remote_commitment_txn_on_chain = HashMap::with_capacity(cmp::min(remote_commitment_txn_on_chain_len as usize, MAX_ALLOC_SIZE / 32));
 		for _ in 0..remote_commitment_txn_on_chain_len {
-			let txid: Sha256dHash = Readable::read(reader)?;
+			let txid: Txid = Readable::read(reader)?;
 			let commitment_number = <U48 as Readable>::read(reader)?.0;
 			let outputs_count = <u64 as Readable>::read(reader)?;
 			let mut outputs = Vec::with_capacity(cmp::min(outputs_count as usize, MAX_ALLOC_SIZE / 8));
@@ -2411,7 +2411,7 @@ impl<ChanSigner: ChannelKeys + Readable> ReadableArgs<Arc<Logger>> for (Sha256dH
 			}
 		}
 
-		let last_block_hash: Sha256dHash = Readable::read(reader)?;
+		let last_block_hash: BlockHash = Readable::read(reader)?;
 
 		let waiting_threshold_conf_len: u64 = Readable::read(reader)?;
 		let mut onchain_events_waiting_threshold_conf = HashMap::with_capacity(cmp::min(waiting_threshold_conf_len as usize, MAX_ALLOC_SIZE / 128));
@@ -2442,7 +2442,7 @@ impl<ChanSigner: ChannelKeys + Readable> ReadableArgs<Arc<Logger>> for (Sha256dH
 		}
 
 		let outputs_to_watch_len: u64 = Readable::read(reader)?;
-		let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Sha256dHash>() + mem::size_of::<Vec<Script>>())));
+		let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 		for _ in 0..outputs_to_watch_len {
 			let txid = Readable::read(reader)?;
 			let outputs_len: u64 = Readable::read(reader)?;
@@ -2520,8 +2520,8 @@ mod tests {
 	use bitcoin::util::bip143;
 	use bitcoin::hashes::Hash;
 	use bitcoin::hashes::sha256::Hash as Sha256;
-	use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 	use bitcoin::hashes::hex::FromHex;
+	use bitcoin::hash_types::Txid;
 	use hex;
 	use chain::transaction::OutPoint;
 	use ln::channelmanager::{PaymentPreimage, PaymentHash};
@@ -2605,7 +2605,7 @@ mod tests {
 		// old state.
 		let mut monitor = ChannelMonitor::new(keys,
 			&PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()), 0, &Script::new(),
-			(OutPoint { txid: Sha256dHash::from_slice(&[43; 32]).unwrap(), index: 0 }, Script::new()),
+			(OutPoint { txid: Txid::from_slice(&[43; 32]).unwrap(), index: 0 }, Script::new()),
 			&PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[44; 32]).unwrap()),
 			&PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[45; 32]).unwrap()),
 			10, Script::new(), 46, 0, LocalCommitmentTransaction::dummy(), logger.clone());
@@ -2693,7 +2693,7 @@ mod tests {
 		}
 
 		let script_pubkey = Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script();
-		let txid = Sha256dHash::from_hex("56944c5d3f98413ef45cf54545538103cc9f298e0575820ad3591376e2e0f65d").unwrap();
+		let txid = Txid::from_hex("56944c5d3f98413ef45cf54545538103cc9f298e0575820ad3591376e2e0f65d").unwrap();
 
 		// Justice tx with 1 to_local, 2 revoked offered HTLCs, 1 revoked received HTLCs
 		let mut claim_tx = Transaction { version: 0, lock_time: 0, input: Vec::new(), output: Vec::new() };
diff --git a/lightning/src/ln/functional_test_utils.rs b/lightning/src/ln/functional_test_utils.rs
index 2906fc51d..4a56ea412 100644
--- a/lightning/src/ln/functional_test_utils.rs
+++ b/lightning/src/ln/functional_test_utils.rs
@@ -25,8 +25,8 @@ use bitcoin::blockdata::transaction::{Transaction, TxOut};
 use bitcoin::network::constants::Network;
 
 use bitcoin::hashes::sha256::Hash as Sha256;
-use bitcoin::hashes::sha256d::Hash as Sha256d;
 use bitcoin::hashes::Hash;
+use bitcoin::hash_types::BlockHash;
 
 use bitcoin::secp256k1::Secp256k1;
 use bitcoin::secp256k1::key::PublicKey;
@@ -50,7 +50,7 @@ pub fn confirm_transaction<'a, 'b: 'a>(notifier: &'a chaininterface::BlockNotifi
 	}
 }
 
-pub fn connect_blocks<'a, 'b>(notifier: &'a chaininterface::BlockNotifierRef<'b>, depth: u32, height: u32, parent: bool, prev_blockhash: Sha256d) -> Sha256d {
+pub fn connect_blocks<'a, 'b>(notifier: &'a chaininterface::BlockNotifierRef<'b>, depth: u32, height: u32, parent: bool, prev_blockhash: BlockHash) -> BlockHash {
 	let mut header = BlockHeader { version: 0x2000000, prev_blockhash: if parent { prev_blockhash } else { Default::default() }, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 	notifier.block_connected_checked(&header, height + 1, &Vec::new(), &Vec::new());
 	for i in 2..depth + 1 {
@@ -137,7 +137,7 @@ impl<'a, 'b, 'c> Drop for Node<'a, 'b, 'c> {
 				for (_, old_monitor) in old_monitors.iter() {
 					let mut w = test_utils::TestVecWriter(Vec::new());
 					old_monitor.write_for_disk(&mut w).unwrap();
-					let (_, deserialized_monitor) = <(Sha256d, ChannelMonitor<EnforcingChannelKeys>)>::read(
+					let (_, deserialized_monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(
 						&mut ::std::io::Cursor::new(&w.0), Arc::clone(&self.logger) as Arc<Logger>).unwrap();
 					deserialized_monitors.push(deserialized_monitor);
 				}
@@ -153,7 +153,7 @@ impl<'a, 'b, 'c> Drop for Node<'a, 'b, 'c> {
 
 				let mut w = test_utils::TestVecWriter(Vec::new());
 				self.node.write(&mut w).unwrap();
-				<(Sha256d, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut ::std::io::Cursor::new(w.0), ChannelManagerReadArgs {
+				<(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut ::std::io::Cursor::new(w.0), ChannelManagerReadArgs {
 					default_config: UserConfig::default(),
 					keys_manager: self.keys_manager,
 					fee_estimator: &test_utils::TestFeeEstimator { sat_per_kw: 253 },
diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs
index 49d0c0a9f..3a440fb32 100644
--- a/lightning/src/ln/functional_tests.rs
+++ b/lightning/src/ln/functional_tests.rs
@@ -26,6 +26,7 @@ use util::logger::Logger;
 
 use bitcoin::util::hash::BitcoinHash;
 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::{Txid, BlockHash};
 use bitcoin::util::bip143;
 use bitcoin::util::address::Address;
 use bitcoin::util::bip32::{ChildNumber, ExtendedPubKey, ExtendedPrivKey};
@@ -3078,7 +3079,7 @@ 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].chan_monitor.simple_monitor.monitors.lock().unwrap();
-		monitors.get_mut(&OutPoint::new(Sha256dHash::from_slice(&payment_event.commitment_msg.channel_id[..]).unwrap(), 0)).unwrap()
+		monitors.get_mut(&OutPoint::new(Txid::from_slice(&payment_event.commitment_msg.channel_id[..]).unwrap(), 0)).unwrap()
 			.provide_payment_preimage(&our_payment_hash, &our_payment_preimage);
 	}
 	nodes[2].block_notifier.block_connected_checked(&header, 1, &[&tx], &[1]);
@@ -3827,7 +3828,7 @@ fn test_invalid_channel_announcement() {
 	assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
 
 	let mut unsigned_msg = dummy_unsigned_msg!();
-	unsigned_msg.chain_hash = Sha256dHash::hash(&[1,2,3,4,5,6,7,8,9]);
+	unsigned_msg.chain_hash = BlockHash::hash(&[1,2,3,4,5,6,7,8,9]);
 	sign_msg!(unsigned_msg);
 	assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
 }
@@ -3855,7 +3856,7 @@ fn test_no_txn_manager_serialize_deserialize() {
 	new_chan_monitor = test_utils::TestChannelMonitor::new(nodes[0].chain_monitor.clone(), nodes[0].tx_broadcaster.clone(), Arc::new(test_utils::TestLogger::new()), &fee_estimator);
 	nodes[0].chan_monitor = &new_chan_monitor;
 	let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-	let (_, mut chan_0_monitor) = <(Sha256dHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut chan_0_monitor_read, Arc::new(test_utils::TestLogger::new())).unwrap();
+	let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut chan_0_monitor_read, Arc::new(test_utils::TestLogger::new())).unwrap();
 	assert!(chan_0_monitor_read.is_empty());
 
 	let mut nodes_0_read = &nodes_0_serialized[..];
@@ -3864,7 +3865,7 @@ fn test_no_txn_manager_serialize_deserialize() {
 	let (_, nodes_0_deserialized_tmp) = {
 		let mut channel_monitors = HashMap::new();
 		channel_monitors.insert(chan_0_monitor.get_funding_txo(), &mut chan_0_monitor);
-		<(Sha256dHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+		<(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
 			default_config: config,
 			keys_manager: &keys_manager,
 			fee_estimator: &fee_estimator,
@@ -3929,7 +3930,7 @@ fn test_simple_manager_serialize_deserialize() {
 	new_chan_monitor = test_utils::TestChannelMonitor::new(nodes[0].chain_monitor.clone(), nodes[0].tx_broadcaster.clone(), Arc::new(test_utils::TestLogger::new()), &fee_estimator);
 	nodes[0].chan_monitor = &new_chan_monitor;
 	let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
-	let (_, mut chan_0_monitor) = <(Sha256dHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut chan_0_monitor_read, Arc::new(test_utils::TestLogger::new())).unwrap();
+	let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut chan_0_monitor_read, Arc::new(test_utils::TestLogger::new())).unwrap();
 	assert!(chan_0_monitor_read.is_empty());
 
 	let mut nodes_0_read = &nodes_0_serialized[..];
@@ -3937,7 +3938,7 @@ fn test_simple_manager_serialize_deserialize() {
 	let (_, nodes_0_deserialized_tmp) = {
 		let mut channel_monitors = HashMap::new();
 		channel_monitors.insert(chan_0_monitor.get_funding_txo(), &mut chan_0_monitor);
-		<(Sha256dHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+		<(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
 			default_config: UserConfig::default(),
 			keys_manager: &keys_manager,
 			fee_estimator: &fee_estimator,
@@ -4008,7 +4009,7 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
 	let mut node_0_stale_monitors = Vec::new();
 	for serialized in node_0_stale_monitors_serialized.iter() {
 		let mut read = &serialized[..];
-		let (_, monitor) = <(Sha256dHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut read, Arc::new(test_utils::TestLogger::new())).unwrap();
+		let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut read, Arc::new(test_utils::TestLogger::new())).unwrap();
 		assert!(read.is_empty());
 		node_0_stale_monitors.push(monitor);
 	}
@@ -4016,7 +4017,7 @@ 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) = <(Sha256dHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut read, Arc::new(test_utils::TestLogger::new())).unwrap();
+		let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut read, Arc::new(test_utils::TestLogger::new())).unwrap();
 		assert!(read.is_empty());
 		node_0_monitors.push(monitor);
 	}
@@ -4025,7 +4026,7 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
 
 	let mut nodes_0_read = &nodes_0_serialized[..];
 	if let Err(msgs::DecodeError::InvalidValue) =
-		<(Sha256dHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+		<(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
 		default_config: UserConfig::default(),
 		keys_manager: &keys_manager,
 		fee_estimator: &fee_estimator,
@@ -4039,7 +4040,7 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
 
 	let mut nodes_0_read = &nodes_0_serialized[..];
 	let (_, nodes_0_deserialized_tmp) =
-		<(Sha256dHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
+		<(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
 		default_config: UserConfig::default(),
 		keys_manager: &keys_manager,
 		fee_estimator: &fee_estimator,
@@ -5445,7 +5446,7 @@ impl msgs::ChannelUpdate {
 		msgs::ChannelUpdate {
 			signature: Signature::from(FFISignature::new()),
 			contents: msgs::UnsignedChannelUpdate {
-				chain_hash: Sha256dHash::hash(&vec![0u8][..]),
+				chain_hash: BlockHash::hash(&vec![0u8][..]),
 				short_channel_id: 0,
 				timestamp: 0,
 				flags: 0,
@@ -6833,7 +6834,7 @@ fn test_data_loss_protect() {
 
 	// Restore node A from previous state
 	let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::with_id(format!("node {}", 0)));
-	let mut chan_monitor = <(Sha256dHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut ::std::io::Cursor::new(previous_chan_monitor_state.0), Arc::clone(&logger)).unwrap().1;
+	let mut chan_monitor = <(BlockHash, ChannelMonitor<EnforcingChannelKeys>)>::read(&mut ::std::io::Cursor::new(previous_chan_monitor_state.0), Arc::clone(&logger)).unwrap().1;
 	let chain_monitor = Arc::new(ChainWatchInterfaceUtil::new(Network::Testnet, Arc::clone(&logger)));
 	tx_broadcaster = test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())};
 	fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: 253 };
@@ -6842,7 +6843,7 @@ fn test_data_loss_protect() {
 	node_state_0 = {
 		let mut channel_monitors = HashMap::new();
 		channel_monitors.insert(OutPoint { txid: chan.3.txid(), index: 0 }, &mut chan_monitor);
-		<(Sha256dHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut ::std::io::Cursor::new(previous_node_state), ChannelManagerReadArgs {
+		<(BlockHash, ChannelManager<EnforcingChannelKeys, &test_utils::TestChannelMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator>)>::read(&mut ::std::io::Cursor::new(previous_node_state), ChannelManagerReadArgs {
 			keys_manager: &keys_manager,
 			fee_estimator: &fee_estimator,
 			monitor: &monitor,
@@ -7657,7 +7658,7 @@ fn test_update_err_monitor_lockdown() {
 		let monitor = monitors.get(&outpoint).unwrap();
 		let mut w = test_utils::TestVecWriter(Vec::new());
 		monitor.write_for_disk(&mut w).unwrap();
-		let new_monitor = <(Sha256dHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
+		let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
 				&mut ::std::io::Cursor::new(&w.0), Arc::new(test_utils::TestLogger::new())).unwrap().1;
 		assert!(new_monitor == *monitor);
 		let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, logger.clone() as Arc<Logger>));
diff --git a/lightning/src/ln/msgs.rs b/lightning/src/ln/msgs.rs
index 6c1d3cd92..fb506c475 100644
--- a/lightning/src/ln/msgs.rs
+++ b/lightning/src/ln/msgs.rs
@@ -18,8 +18,8 @@
 use bitcoin::secp256k1::key::PublicKey;
 use bitcoin::secp256k1::Signature;
 use bitcoin::secp256k1;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::blockdata::script::Script;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
 
@@ -84,7 +84,7 @@ pub struct Pong {
 /// An open_channel message to be sent or received from a peer
 #[derive(Clone)]
 pub struct OpenChannel {
-	pub(crate) chain_hash: Sha256dHash,
+	pub(crate) chain_hash: BlockHash,
 	pub(crate) temporary_channel_id: [u8; 32],
 	pub(crate) funding_satoshis: u64,
 	pub(crate) push_msat: u64,
@@ -129,7 +129,7 @@ pub struct AcceptChannel {
 #[derive(Clone)]
 pub struct FundingCreated {
 	pub(crate) temporary_channel_id: [u8; 32],
-	pub(crate) funding_txid: Sha256dHash,
+	pub(crate) funding_txid: Txid,
 	pub(crate) funding_output_index: u16,
 	pub(crate) signature: Signature,
 }
@@ -403,7 +403,7 @@ pub struct NodeAnnouncement {
 #[derive(PartialEq, Clone, Debug)]
 pub struct UnsignedChannelAnnouncement {
 	pub(crate) features: ChannelFeatures,
-	pub(crate) chain_hash: Sha256dHash,
+	pub(crate) chain_hash: BlockHash,
 	pub(crate) short_channel_id: u64,
 	/// One of the two node_ids which are endpoints of this channel
 	pub        node_id_1: PublicKey,
@@ -425,7 +425,7 @@ pub struct ChannelAnnouncement {
 
 #[derive(PartialEq, Clone, Debug)]
 pub(crate) struct UnsignedChannelUpdate {
-	pub(crate) chain_hash: Sha256dHash,
+	pub(crate) chain_hash: BlockHash,
 	pub(crate) short_channel_id: u64,
 	pub(crate) timestamp: u32,
 	pub(crate) flags: u16,
@@ -1360,12 +1360,12 @@ mod tests {
 	use ln::channelmanager::{PaymentPreimage, PaymentHash, PaymentSecret};
 	use util::ser::{Writeable, Readable};
 
-	use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 	use bitcoin::hashes::hex::FromHex;
 	use bitcoin::util::address::Address;
 	use bitcoin::network::constants::Network;
 	use bitcoin::blockdata::script::Builder;
 	use bitcoin::blockdata::opcodes;
+	use bitcoin::hash_types::{Txid, BlockHash};
 
 	use bitcoin::secp256k1::key::{PublicKey,SecretKey};
 	use bitcoin::secp256k1::{Secp256k1, Message};
@@ -1461,7 +1461,7 @@ mod tests {
 		}
 		let unsigned_channel_announcement = msgs::UnsignedChannelAnnouncement {
 			features,
-			chain_hash: if !non_bitcoin_chain_hash { Sha256dHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { Sha256dHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
+			chain_hash: if !non_bitcoin_chain_hash { BlockHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { BlockHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
 			short_channel_id: 2316138423780173,
 			node_id_1: pubkey_1,
 			node_id_2: pubkey_2,
@@ -1611,7 +1611,7 @@ mod tests {
 		let (privkey_1, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
 		let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
 		let unsigned_channel_update = msgs::UnsignedChannelUpdate {
-			chain_hash: if !non_bitcoin_chain_hash { Sha256dHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { Sha256dHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
+			chain_hash: if !non_bitcoin_chain_hash { BlockHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { BlockHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
 			short_channel_id: 2316138423780173,
 			timestamp: 20190119,
 			flags: if direction { 1 } else { 0 } | if disable { 1 << 1 } else { 0 } | if htlc_maximum_msat { 1 << 8 } else { 0 },
@@ -1673,7 +1673,7 @@ mod tests {
 		let (_, pubkey_5) = get_keys_from!("0505050505050505050505050505050505050505050505050505050505050505", secp_ctx);
 		let (_, pubkey_6) = get_keys_from!("0606060606060606060606060606060606060606060606060606060606060606", secp_ctx);
 		let open_channel = msgs::OpenChannel {
-			chain_hash: if !non_bitcoin_chain_hash { Sha256dHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { Sha256dHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
+			chain_hash: if !non_bitcoin_chain_hash { BlockHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { BlockHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
 			temporary_channel_id: [2; 32],
 			funding_satoshis: 1311768467284833366,
 			push_msat: 2536655962884945560,
@@ -1767,7 +1767,7 @@ mod tests {
 		let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
 		let funding_created = msgs::FundingCreated {
 			temporary_channel_id: [2; 32],
-			funding_txid: Sha256dHash::from_hex("c2d4449afa8d26140898dd54d3390b057ba2a5afcf03ba29d7dc0d8b9ffe966e").unwrap(),
+			funding_txid: Txid::from_hex("c2d4449afa8d26140898dd54d3390b057ba2a5afcf03ba29d7dc0d8b9ffe966e").unwrap(),
 			funding_output_index: 255,
 			signature: sig_1,
 		};
diff --git a/lightning/src/ln/onchaintx.rs b/lightning/src/ln/onchaintx.rs
index dd393d82f..19c901fc9 100644
--- a/lightning/src/ln/onchaintx.rs
+++ b/lightning/src/ln/onchaintx.rs
@@ -8,7 +8,7 @@ use bitcoin::blockdata::transaction::OutPoint as BitcoinOutPoint;
 use bitcoin::blockdata::script::Script;
 use bitcoin::util::bip143;
 
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::Txid;
 
 use bitcoin::secp256k1::{Secp256k1, Signature};
 use bitcoin::secp256k1;
@@ -37,7 +37,7 @@ enum OnchainEvent {
 	/// Outpoint under claim process by our own tx, once this one get enough confirmations, we remove it from
 	/// bump-txn candidate buffer.
 	Claim {
-		claim_request: Sha256dHash,
+		claim_request: Txid,
 	},
 	/// Claim tx aggregate multiple claimable outpoints. One of the outpoint may be claimed by a remote party tx.
 	/// In this case, we need to drop the outpoint and regenerate a new claim tx. By safety, we keep tracking
@@ -210,9 +210,9 @@ pub struct OnchainTxHandler<ChanSigner: ChannelKeys> {
 	// us and is immutable until all outpoint of the claimable set are post-anti-reorg-delay solved.
 	// Entry is cache of elements need to generate a bumped claiming transaction (see ClaimTxBumpMaterial)
 	#[cfg(test)] // Used in functional_test to verify sanitization
-	pub pending_claim_requests: HashMap<Sha256dHash, ClaimTxBumpMaterial>,
+	pub pending_claim_requests: HashMap<Txid, ClaimTxBumpMaterial>,
 	#[cfg(not(test))]
-	pending_claim_requests: HashMap<Sha256dHash, ClaimTxBumpMaterial>,
+	pending_claim_requests: HashMap<Txid, ClaimTxBumpMaterial>,
 
 	// Used to link outpoints claimed in a connected block to a pending claim request.
 	// Key is outpoint than monitor parsing has detected we have keys/scripts to claim
@@ -221,9 +221,9 @@ pub struct OnchainTxHandler<ChanSigner: ChannelKeys> {
 	// post-anti-reorg-delay solved, confirmaiton_block is used to erase entry if
 	// block with output gets disconnected.
 	#[cfg(test)] // Used in functional_test to verify sanitization
-	pub claimable_outpoints: HashMap<BitcoinOutPoint, (Sha256dHash, u32)>,
+	pub claimable_outpoints: HashMap<BitcoinOutPoint, (Txid, u32)>,
 	#[cfg(not(test))]
-	claimable_outpoints: HashMap<BitcoinOutPoint, (Sha256dHash, u32)>,
+	claimable_outpoints: HashMap<BitcoinOutPoint, (Txid, u32)>,
 
 	onchain_events_waiting_threshold_conf: HashMap<u32, Vec<OnchainEvent>>,
 
diff --git a/lightning/src/ln/router.rs b/lightning/src/ln/router.rs
index a1a6e42d8..b98569d3d 100644
--- a/lightning/src/ln/router.rs
+++ b/lightning/src/ln/router.rs
@@ -9,6 +9,7 @@ use bitcoin::secp256k1;
 
 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::hashes::Hash;
+use bitcoin::hash_types::BlockHash;
 use bitcoin::blockdata::script::Builder;
 use bitcoin::blockdata::opcodes;
 
@@ -329,19 +330,19 @@ impl std::fmt::Display for NetworkMap {
 impl NetworkMap {
 	#[cfg(feature = "non_bitcoin_chain_hash_routing")]
 	#[inline]
-	fn get_key(short_channel_id: u64, chain_hash: Sha256dHash) -> (u64, Sha256dHash) {
+	fn get_key(short_channel_id: u64, chain_hash: BlockHash) -> (u64, BlockHash) {
 		(short_channel_id, chain_hash)
 	}
 
 	#[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
 	#[inline]
-	fn get_key(short_channel_id: u64, _: Sha256dHash) -> u64 {
+	fn get_key(short_channel_id: u64, _: BlockHash) -> u64 {
 		short_channel_id
 	}
 
 	#[cfg(feature = "non_bitcoin_chain_hash_routing")]
 	#[inline]
-	fn get_short_id(id: &(u64, Sha256dHash)) -> &u64 {
+	fn get_short_id(id: &(u64, BlockHash)) -> &u64 {
 		&id.0
 	}
 
@@ -1087,6 +1088,7 @@ mod tests {
 
 	use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 	use bitcoin::hashes::Hash;
+	use bitcoin::hash_types::BlockHash;
 	use bitcoin::network::constants::Network;
 	use bitcoin::blockdata::constants::genesis_block;
 	use bitcoin::blockdata::script::Builder;
@@ -1181,7 +1183,7 @@ mod tests {
 		let node7 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0808080808080808080808080808080808080808080808080808080808080808").unwrap()[..]).unwrap());
 		let node8 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0909090909090909090909090909090909090909090909090909090909090909").unwrap()[..]).unwrap());
 
-		let zero_hash = Sha256dHash::hash(&[0; 32]);
+		let zero_hash = BlockHash::hash(&[0; 32]);
 
 		macro_rules! id_to_feature_flags {
 			// Set the feature flags to the id'th odd (ie non-required) feature bit so that we can
diff --git a/lightning/src/util/macro_logger.rs b/lightning/src/util/macro_logger.rs
index b6f89fe9b..b94540446 100644
--- a/lightning/src/util/macro_logger.rs
+++ b/lightning/src/util/macro_logger.rs
@@ -1,7 +1,7 @@
 use chain::transaction::OutPoint;
 use chain::keysinterface::SpendableOutputDescriptor;
 
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::Txid;
 use bitcoin::blockdata::transaction::Transaction;
 use bitcoin::secp256k1::key::PublicKey;
 
@@ -40,7 +40,7 @@ macro_rules! log_bytes {
 	}
 }
 
-pub(crate) struct DebugFundingChannelId<'a>(pub &'a Sha256dHash, pub u16);
+pub(crate) struct DebugFundingChannelId<'a>(pub &'a Txid, pub u16);
 impl<'a> std::fmt::Display for DebugFundingChannelId<'a> {
 	fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
 		for i in OutPoint::new(self.0.clone(), self.1).to_channel_id().iter() {
diff --git a/lightning/src/util/ser.rs b/lightning/src/util/ser.rs
index fd0e9f7a3..a087467f7 100644
--- a/lightning/src/util/ser.rs
+++ b/lightning/src/util/ser.rs
@@ -15,6 +15,7 @@ use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
 use bitcoin::consensus;
 use bitcoin::consensus::Encodable;
 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::{Txid, BlockHash};
 use std::marker::Sized;
 use ln::msgs::DecodeError;
 use ln::channelmanager::{PaymentPreimage, PaymentHash, PaymentSecret};
@@ -632,6 +633,36 @@ impl<T: Readable> Readable for Option<T>
 	}
 }
 
+impl Writeable for Txid {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+		w.write_all(&self[..])
+	}
+}
+
+impl Readable for Txid {
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		use bitcoin::hashes::Hash;
+
+		let buf: [u8; 32] = Readable::read(r)?;
+		Ok(Txid::from_slice(&buf[..]).unwrap())
+	}
+}
+
+impl Writeable for BlockHash {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+		w.write_all(&self[..])
+	}
+}
+
+impl Readable for BlockHash {
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		use bitcoin::hashes::Hash;
+
+		let buf: [u8; 32] = Readable::read(r)?;
+		Ok(BlockHash::from_slice(&buf[..]).unwrap())
+	}
+}
+
 impl Writeable for OutPoint {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 		self.txid.write(w)?;
diff --git a/lightning/src/util/test_utils.rs b/lightning/src/util/test_utils.rs
index 12b489446..b436d0c13 100644
--- a/lightning/src/util/test_utils.rs
+++ b/lightning/src/util/test_utils.rs
@@ -16,8 +16,8 @@ use bitcoin::blockdata::transaction::Transaction;
 use bitcoin::blockdata::script::{Builder, Script};
 use bitcoin::blockdata::block::Block;
 use bitcoin::blockdata::opcodes;
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::network::constants::Network;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use bitcoin::secp256k1::{SecretKey, PublicKey};
 
@@ -72,7 +72,7 @@ impl<'a> channelmonitor::ManyChannelMonitor<EnforcingChannelKeys> for TestChanne
 		// to a watchtower and disk...
 		let mut w = TestVecWriter(Vec::new());
 		monitor.write_for_disk(&mut w).unwrap();
-		let new_monitor = <(Sha256dHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
+		let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
 				&mut ::std::io::Cursor::new(&w.0), Arc::new(TestLogger::new())).unwrap().1;
 		assert!(new_monitor == monitor);
 		self.latest_monitor_update_id.lock().unwrap().insert(funding_txo.to_channel_id(), (funding_txo, monitor.get_latest_update_id()));
@@ -101,7 +101,7 @@ impl<'a> channelmonitor::ManyChannelMonitor<EnforcingChannelKeys> for TestChanne
 		let monitor = monitors.get(&funding_txo).unwrap();
 		w.0.clear();
 		monitor.write_for_disk(&mut w).unwrap();
-		let new_monitor = <(Sha256dHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
+		let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>::read(
 				&mut ::std::io::Cursor::new(&w.0), Arc::new(TestLogger::new())).unwrap().1;
 		assert!(new_monitor == *monitor);
 		self.added_monitors.lock().unwrap().push((funding_txo, new_monitor));
@@ -288,15 +288,15 @@ impl TestChainWatcher {
 }
 
 impl ChainWatchInterface for TestChainWatcher {
-	fn install_watch_tx(&self, _txid: &Sha256dHash, _script_pub_key: &Script) { }
-	fn install_watch_outpoint(&self, _outpoint: (Sha256dHash, u32), _out_script: &Script) { }
+	fn install_watch_tx(&self, _txid: &Txid, _script_pub_key: &Script) { }
+	fn install_watch_outpoint(&self, _outpoint: (Txid, u32), _out_script: &Script) { }
 	fn watch_all_txn(&self) { }
 	fn filter_block<'a>(&self, _block: &'a Block) -> (Vec<&'a Transaction>, Vec<u32>) {
 		(Vec::new(), Vec::new())
 	}
 	fn reentered(&self) -> usize { 0 }
 
-	fn get_chain_utxo(&self, _genesis_hash: Sha256dHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
+	fn get_chain_utxo(&self, _genesis_hash: BlockHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
 		self.utxo_ret.lock().unwrap().clone()
 	}
 }