* Minimum supported rust version (MSRV) is now 1.41.1 (#1310).
* Lightning feature `option_scid_alias` is now supported and may be negotiated
when opening a channel with a peer. It can be configured via
`ChannelHandshakeConfig::negotiate_scid_privacy` and is off by default but
will be on by default in the future (#1351).
* `OpenChannelRequest` now has a `channel_type` field indicating the features
the channel will operate with and should be used to filter channels with
undesirable features (#1351). See the Serialization Compatibility section.
* `ChannelManager` supports sending and receiving short channel id aliases in
the `funding_locked` message. These are used when forwarding payments and
constructing invoice route hints for improved privacy. `ChannelDetails` has a
`inbound_scid_alias` field and a `get_inbound_payment_scid` method to support
the latter (#1311).
* `DefaultRouter` and `find_route` take an additional random seed to improve
privacy by adding a random CLTV expiry offset to each path's final hop. This
helps obscure the intended recipient from adversarial intermediate hops
(#1286). The seed is also used to randomize candidate paths during route
selection (#1359).
* The `lightning-block-sync` crate's `init::synchronize_listeners` method
interface has been relaxed to support multithreaded environments (#1349).
* `ChannelManager::create_inbound_payment_for_hash`'s documentation has been
corrected to remove the one-year restriction on `invoice_expiry_delta_secs`,
which is only applicable to the deprecated `create_inbound_payment_legacy`
and `create_inbound_payment_for_hash_legacy` methods (#1341).
* `Features` mutator methods now take `self` by reference instead of by value
(#1331).
* The CLTV of the last hop in a path is now included when comparing against
`RouteParameters::max_total_cltv_expiry_delta` (#1358).
* Invoice creation functions in `lightning-invoice` crate's `utils` module
include versions that accept a description hash instead of only a description
(#1361).
* `RoutingMessageHandler::sync_routing_table` has been renamed `peer_connected`
(#1368).
* `MessageSendEvent::SendGossipTimestampFilter` has been added to indicate that
a `gossip_timestamp_filter` should be sent (#1368).
* `PeerManager` takes an optional `NetAddress` in `new_outbound_connection` and
`new_inbound_connection`, which is used to report back the remote address to
the connecting peer in the `init` message (#1326).
* `ChannelManager::accept_inbound_channel` now takes a `user_channel_id`, which
is used in a similar manner as in outbound channels. (#1381).
* `BackgroundProcessor` now persists `NetworkGraph` on a timer and upon
shutdown as part of a new `Persister` trait, which also includes
`ChannelManager` persistence (#1376).
* `ProbabilisticScoringParameters` now has a `base_penalty_msat` option, which
default to 500 msats. It is applied at each hop to help avoid longer paths
(#1375).
* `ProbabilisticScoringParameters::liquidity_penalty_multiplier_msat`'s default
value is now 40,000 msats instead of 10,000 msats (#1375).
* The `lightning` crate has a `grind_signatures` feature used to produce
signatures with low r-values for more predictable transaction weight. This
feature is on by default (#1388).
* `ProbabilisticScoringParameters` now has a `amount_penalty_multiplier_msat`
option, which is used to further penalize large amounts (#1399).
* `PhantomRouteHints`, `FixedPenaltyScorer`, and `ScoringParameters` now
implement `Clone` (#1346).
Bug Fixes
=========
* Fixed a compilation error in `ProbabilisticScorer` under `--feature=no-std`
(#1347).
* Invoice creation functions in `lightning-invoice` crate's `utils` module
filter invoice hints in order to limit the invoice size (#1325).
* Fixed a bug where a `funding_locked` message was delayed by a block if the
funding transaction was confirmed while offline, depending on the ordering
of `Confirm::transactions_confirmed` calls when brought back online (#1363).
* Fixed a bug in `NetGraphMsgHandler` where it didn't continue to receive
gossip messages from peers after initial connection (#1368, #1382).
* `ChannelManager::timer_tick_occurred` will now timeout a received multi-path
payment (MPP) after three ticks if not received in full instead of waiting
until near the HTLC timeout block(#1353).
* Fixed an issue with `find_route` causing it to be overly aggressive in using
MPP over channels to the same first hop (#1370).
* Reduced time spent processing `channel_update` messages by checking
signatures after checking if no newer messages have already been processed
(#1380).
* Fixed a few issues in `find_route` which caused preferring paths with a
higher cost (#1398).
* Fixed an issue in `ProbabilisticScorer` where a channel with not enough
liquidity could still be used when retrying a failed payment if it was on a
path with an overall lower cost (#1399).
* Channels open with `option_scid_alias` negotiated will be incompatible with
prior releases (#1351). This may occur in the following cases:
* Outbound channels when `ChannelHandshakeConfig::negotiate_scid_privacy` is
enabled.
* Inbound channels when automatically accepted from an `OpenChannel` message
with a `channel_type` that has `ChannelTypeFeatures::supports_scid_privacy`
return true. See `UserConfig::accept_inbound_channels`.
* Inbound channels when manually accepted from an `OpenChannelRequest` with a
`channel_type` that has `ChannelTypeFeatures::supports_scid_privacy` return
true. See `UserConfig::manually_accept_inbound_channels`.
In total, this release features 43 files changed, 4052 insertions, 1274
deletions in 75 commits from 11 authors, in alphabetical order:
* Devrandom
* Duncan Dean
* Elias Rohrer
* Jeffrey Czyz
* Jurvis Tan
* Luiz Parreira
* Matt Corallo
* Omar Shamardy
* Viktor Tigerström
* dependabot[bot]
* psycho-pirate
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projects / rust-lightning / tag