X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Frouting%2Frouter.rs;h=104f4c93c3871aca1f0e6f3af73a959e9c13001f;hb=d7a6d0d10db17f8c737bf3ad40e7b9f4343e60d8;hp=faf414cc10651fe63fb9a00887554136ccea699e;hpb=c86cacd29d72c0af62cfd29d78dcf17a6d8f8c71;p=rust-lightning

diff --git a/lightning/src/routing/router.rs b/lightning/src/routing/router.rs
index faf414cc..104f4c93 100644
--- a/lightning/src/routing/router.rs
+++ b/lightning/src/routing/router.rs
@@ -90,6 +90,7 @@ pub trait Router {
 		&self, payer: &PublicKey, route_params: &RouteParameters,
 		first_hops: Option<&[&ChannelDetails]>, inflight_htlcs: InFlightHtlcs
 	) -> Result<Route, LightningError>;
+
 	/// Finds a [`Route`] for a payment between the given `payer` and a payee.
 	///
 	/// The `payee` and the payment's value are given in [`RouteParameters::payment_params`]
@@ -2830,7 +2831,7 @@ mod tests {
 
 	use bitcoin::hashes::Hash;
 	use bitcoin::network::constants::Network;
-	use bitcoin::blockdata::constants::genesis_block;
+	use bitcoin::blockdata::constants::ChainHash;
 	use bitcoin::blockdata::script::Builder;
 	use bitcoin::blockdata::opcodes;
 	use bitcoin::blockdata::transaction::TxOut;
@@ -2961,7 +2962,7 @@ mod tests {
 
 		// Disable other paths
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -2973,7 +2974,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -2985,7 +2986,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -2997,7 +2998,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -3009,7 +3010,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 7,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -3024,7 +3025,7 @@ mod tests {
 		// Check against amount_to_transfer_over_msat.
 		// Set minimal HTLC of 200_000_000 msat.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 3,
 			flags: 0,
@@ -3039,7 +3040,7 @@ mod tests {
 		// Second hop only allows to forward 199_999_999 at most, thus not allowing the first hop to
 		// be used.
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 3,
 			flags: 0,
@@ -3062,7 +3063,7 @@ mod tests {
 
 		// Lift the restriction on the first hop.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 4,
 			flags: 0,
@@ -3094,7 +3095,7 @@ mod tests {
 		// One path allows transferring 35-40 sats, another one also allows 35-40 sats.
 		// Thus, they can't send 60 without overpaying.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 0,
@@ -3106,7 +3107,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 3,
 			flags: 0,
@@ -3120,7 +3121,7 @@ mod tests {
 
 		// Make 0 fee.
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -3132,7 +3133,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 0,
@@ -3146,7 +3147,7 @@ mod tests {
 
 		// Disable other paths
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 3,
 			flags: 2, // to disable
@@ -3171,7 +3172,7 @@ mod tests {
 		// Now, test that if there are 2 paths, a "cheaper" by fee path wouldn't be prioritized
 		// while taking even more fee to match htlc_minimum_msat.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 4,
 			flags: 0,
@@ -3183,7 +3184,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 3,
 			flags: 0,
@@ -3195,7 +3196,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 4,
 			flags: 0,
@@ -3240,7 +3241,7 @@ mod tests {
 
 		// First disable all paths except the us -> node1 -> node2 path
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 3,
@@ -3254,7 +3255,7 @@ mod tests {
 
 		// Set channel 4 to free but with a high htlc_minimum_msat
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 0,
@@ -3298,7 +3299,7 @@ mod tests {
 
 		// // Disable channels 4 and 12 by flags=2
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -3310,7 +3311,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -3742,7 +3743,7 @@ mod tests {
 
 		// Disabling channels 6 & 7 by flags=2
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -3754,7 +3755,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 7,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -3816,7 +3817,7 @@ mod tests {
 
 		// Disabling channels 6 & 7 by flags=2
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -3828,7 +3829,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 7,
 			timestamp: 2,
 			flags: 2, // to disable
@@ -4177,7 +4178,7 @@ mod tests {
 
 		// First disable all other paths.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 2,
@@ -4189,7 +4190,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 2,
@@ -4204,7 +4205,7 @@ mod tests {
 		// Make the first channel (#1) very permissive,
 		// and we will be testing all limits on the second channel.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -4219,7 +4220,7 @@ mod tests {
 		// First, let's see if routing works if we have absolutely no idea about the available amount.
 		// In this case, it should be set to 250_000 sats.
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 0,
@@ -4258,7 +4259,7 @@ mod tests {
 		// Check that setting next_outbound_htlc_limit_msat in first_hops limits the channels.
 		// Disable channel #1 and use another first hop.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 3,
 			flags: 2,
@@ -4301,7 +4302,7 @@ mod tests {
 
 		// Enable channel #1 back.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 4,
 			flags: 0,
@@ -4316,7 +4317,7 @@ mod tests {
 
 		// Now let's see if routing works if we know only htlc_maximum_msat.
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 3,
 			flags: 0,
@@ -4357,7 +4358,7 @@ mod tests {
 		// We can't change UTXO capacity on the fly, so we'll disable
 		// the existing channel and add another one with the capacity we need.
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 4,
 			flags: 2,
@@ -4381,7 +4382,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[0], &privkeys[2], ChannelFeatures::from_le_bytes(id_to_feature_flags(3)), 333);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 333,
 			timestamp: 1,
 			flags: 0,
@@ -4393,7 +4394,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 333,
 			timestamp: 1,
 			flags: 1,
@@ -4431,7 +4432,7 @@ mod tests {
 
 		// Now let's see if routing chooses htlc_maximum_msat over UTXO capacity.
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 333,
 			timestamp: 6,
 			flags: 0,
@@ -4486,7 +4487,7 @@ mod tests {
 
 		// Disable other potential paths.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 2,
@@ -4498,7 +4499,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 7,
 			timestamp: 2,
 			flags: 2,
@@ -4513,7 +4514,7 @@ mod tests {
 		// Limit capacities
 
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 0,
@@ -4525,7 +4526,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -4538,7 +4539,7 @@ mod tests {
 		});
 
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 2,
 			flags: 0,
@@ -4550,7 +4551,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[4], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 11,
 			timestamp: 2,
 			flags: 0,
@@ -4616,7 +4617,7 @@ mod tests {
 
 		// Path via node0 is channels {1, 3}. Limit them to 100 and 50 sats (total limit 50).
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -4628,7 +4629,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 0,
@@ -4729,7 +4730,7 @@ mod tests {
 
 		// Path via node0 is channels {1, 3}. Limit them to 100 and 50 sats (total limit 50).
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -4741,7 +4742,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 0,
@@ -4756,7 +4757,7 @@ mod tests {
 		// Path via node7 is channels {12, 13}. Limit them to 60 and 60 sats
 		// (total limit 60).
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 0,
@@ -4768,7 +4769,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -4783,7 +4784,7 @@ mod tests {
 		// Path via node1 is channels {2, 4}. Limit them to 200 and 180 sats
 		// (total capacity 180 sats).
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 0,
@@ -4795,7 +4796,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 0,
@@ -4916,7 +4917,7 @@ mod tests {
 
 		// Disable other potential paths.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 2,
@@ -4928,7 +4929,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 7,
 			timestamp: 2,
 			flags: 2,
@@ -4942,7 +4943,7 @@ mod tests {
 
 		// Path via {node0, node2} is channels {1, 3, 5}.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -4954,7 +4955,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 0,
@@ -4969,7 +4970,7 @@ mod tests {
 		// Capacity of 200 sats because this channel will be used by 3rd path as well.
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[2], &privkeys[3], ChannelFeatures::from_le_bytes(id_to_feature_flags(5)), 5);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 5,
 			timestamp: 2,
 			flags: 0,
@@ -4985,7 +4986,7 @@ mod tests {
 		// Add 100 sats to the capacities of {12, 13}, because these channels
 		// are also used for 3rd path. 100 sats for the rest. Total capacity: 100 sats.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 0,
@@ -4997,7 +4998,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -5010,7 +5011,7 @@ mod tests {
 		});
 
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 2,
 			flags: 0,
@@ -5022,7 +5023,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[4], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 11,
 			timestamp: 2,
 			flags: 0,
@@ -5091,7 +5092,7 @@ mod tests {
 
 		// Disable other potential paths.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 2,
@@ -5103,7 +5104,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 7,
 			timestamp: 2,
 			flags: 2,
@@ -5117,7 +5118,7 @@ mod tests {
 
 		// Path via {node0, node2} is channels {1, 3, 5}.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -5129,7 +5130,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 0,
@@ -5144,7 +5145,7 @@ mod tests {
 		// Capacity of 200 sats because this channel will be used by 3rd path as well.
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[2], &privkeys[3], ChannelFeatures::from_le_bytes(id_to_feature_flags(5)), 5);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 5,
 			timestamp: 2,
 			flags: 0,
@@ -5160,7 +5161,7 @@ mod tests {
 		// Add 100 sats to the capacities of {12, 13}, because these channels
 		// are also used for 3rd path. 100 sats for the rest. Total capacity: 100 sats.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 0,
@@ -5172,7 +5173,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -5185,7 +5186,7 @@ mod tests {
 		});
 
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 2,
 			flags: 0,
@@ -5197,7 +5198,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[4], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 11,
 			timestamp: 2,
 			flags: 0,
@@ -5262,7 +5263,7 @@ mod tests {
 
 		// Disable other potential paths.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 2,
@@ -5275,7 +5276,7 @@ mod tests {
 		});
 
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 7,
 			timestamp: 2,
 			flags: 2,
@@ -5289,7 +5290,7 @@ mod tests {
 
 		// Path via {node0, node2} is channels {1, 3, 5}.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -5301,7 +5302,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 0,
@@ -5315,7 +5316,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[2], &privkeys[3], ChannelFeatures::from_le_bytes(id_to_feature_flags(5)), 5);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 5,
 			timestamp: 2,
 			flags: 0,
@@ -5338,7 +5339,7 @@ mod tests {
 		// - fee for channel 6 is 150 sats
 		// Let's test this by enforcing these 2 conditions and removing other limits.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 0,
@@ -5350,7 +5351,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -5363,7 +5364,7 @@ mod tests {
 		});
 
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 2,
 			flags: 0,
@@ -5375,7 +5376,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[4], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 11,
 			timestamp: 2,
 			flags: 0,
@@ -5464,7 +5465,7 @@ mod tests {
 		// we think we can only send up to 1 additional sat over the last-hop but refuse to as its
 		// under 5% of our payment amount.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -5476,7 +5477,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 0,
@@ -5488,7 +5489,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 0,
@@ -5500,7 +5501,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0|2, // Channel disabled
@@ -5557,7 +5558,7 @@ mod tests {
 
 		// Path via node0 is channels {1, 3}. Limit them to 100 and 50 sats (total limit 50);
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 2,
 			flags: 0,
@@ -5569,7 +5570,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 2,
 			flags: 0,
@@ -5583,7 +5584,7 @@ mod tests {
 
 		// Path via node7 is channels {12, 13}. Limit them to 60 and 60 sats (total limit 60);
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 0,
@@ -5595,7 +5596,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -5609,7 +5610,7 @@ mod tests {
 
 		// Path via node1 is channels {2, 4}. Limit them to 20 and 20 sats (total capacity 20 sats).
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 0,
@@ -5621,7 +5622,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 0,
@@ -5716,7 +5717,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &our_privkey, &privkeys[1], ChannelFeatures::from_le_bytes(id_to_feature_flags(6)), 6);
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 1,
 			flags: 0,
@@ -5731,7 +5732,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[1], &privkeys[4], ChannelFeatures::from_le_bytes(id_to_feature_flags(5)), 5);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 5,
 			timestamp: 1,
 			flags: 0,
@@ -5746,7 +5747,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[4], &privkeys[3], ChannelFeatures::from_le_bytes(id_to_feature_flags(4)), 4);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[4], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 1,
 			flags: 0,
@@ -5761,7 +5762,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[3], &privkeys[2], ChannelFeatures::from_le_bytes(id_to_feature_flags(3)), 3);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[3], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 3,
 			timestamp: 1,
 			flags: 0,
@@ -5776,7 +5777,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[2], &privkeys[4], ChannelFeatures::from_le_bytes(id_to_feature_flags(2)), 2);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[2], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 1,
 			flags: 0,
@@ -5790,7 +5791,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[4], &privkeys[6], ChannelFeatures::from_le_bytes(id_to_feature_flags(1)), 1);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[4], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 1,
 			flags: 0,
@@ -5851,7 +5852,7 @@ mod tests {
 		// We modify the graph to set the htlc_maximum of channel 2 to below the value we wish to
 		// send.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 0,
@@ -5864,7 +5865,7 @@ mod tests {
 		});
 
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 12,
 			timestamp: 2,
 			flags: 0,
@@ -5921,7 +5922,7 @@ mod tests {
 		// gets an htlc_maximum_msat of 80_000 and channel 4 an htlc_minimum_msat of 90_000. We
 		// then try to send 90_000.
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 0,
@@ -5933,7 +5934,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 0,
@@ -6473,7 +6474,7 @@ mod tests {
 		// Set the fee on channel 13 to 100% to match channel 4 giving us two equivalent paths (us
 		// -> node 7 -> node2 and us -> node 1 -> node 2) which we should balance over.
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 4,
 			timestamp: 2,
 			flags: 0,
@@ -6485,7 +6486,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[7], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 13,
 			timestamp: 2,
 			flags: 0,
@@ -7151,7 +7152,7 @@ mod tests {
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[0], &privkeys[1],
 			ChannelFeatures::from_le_bytes(id_to_feature_flags(1)), 1);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 1,
 			flags: 0,
@@ -7163,7 +7164,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 1,
 			flags: 1,
@@ -7584,7 +7585,7 @@ mod tests {
 
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[0], &privkeys[6], ChannelFeatures::from_le_bytes(id_to_feature_flags(6)), 6);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 6,
 			timestamp: 1,
 			flags: 0,
@@ -7711,7 +7712,7 @@ mod tests {
 		add_channel(&gossip_sync, &secp_ctx, &our_privkey, &privkeys[0],
 			ChannelFeatures::from_le_bytes(id_to_feature_flags(1)), 1);
 		update_channel(&gossip_sync, &secp_ctx, &our_privkey, UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 1,
 			flags: 0,
@@ -7723,7 +7724,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 1,
 			timestamp: 1,
 			flags: 1,
@@ -7738,7 +7739,7 @@ mod tests {
 		add_channel(&gossip_sync, &secp_ctx, &privkeys[0], &privkeys[1],
 			ChannelFeatures::from_le_bytes(id_to_feature_flags(1)), 2);
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[0], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 0,
@@ -7750,7 +7751,7 @@ mod tests {
 			excess_data: Vec::new()
 		});
 		update_channel(&gossip_sync, &secp_ctx, &privkeys[1], UnsignedChannelUpdate {
-			chain_hash: genesis_block(Network::Testnet).header.block_hash(),
+			chain_hash: ChainHash::using_genesis_block(Network::Testnet),
 			short_channel_id: 2,
 			timestamp: 2,
 			flags: 1,