v0.0.106

API Updates

• 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).

Serialization Compatibility

• 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