Release Notes

Routing

The default CLTV delta delay has been increased from 40 blocks to 80 blocks.

Wallet

The logging around transaction broadcast failures has been improved by always logging the causing error and the raw transaction as hex.

`lncli`

The lncli wallet psbt fund command now allows users to specify the --min_confs flag.
Add time_lock_delta overflow check for UpdateChannelPolicy that ensure time_lock_delta is greater or equal than 0 and less or equal than 65535
Added ability to backup, verify and restore single channels to and from a file on disk.
Add a fundmax flag to openchannel to allow for the allocation of all funds in a wallet towards a new channel opening.

Watchtowers

Fix Address iterator panic
Allow caller to filter sessions at the time of reading them from disk
Clean up sessions once all channels for which they have updates for are closed. Also start sending the DeleteSession message to the tower.
Don't load exhausted sessions when not needed. Also add a new exclude_exhausted_sessions boolean flag to the relevant lncli wtclient commands.
Recover from StateUpdateCodeClientBehind error after data loss.

Build

ldflags were being incorrectly passed

Misc

Return FEE_INSUFFICIENT before checking balance for incoming low-fee HTLCs..
Optimize script allocation size in order to save memory.
When resolving outgoing HTLCs onchain, the HTLC timeout resolver will now monitor mempool for faster preimage extraction.

Spec

Add test vectors for option_zero_fee_htlc_tx

RPC

A debug log has been added to lnrpc so the node operator can know whether a certain request has happened or not.
Add peer_scid_alias to the response of listchannels
Message funding_locked has been renamed to channel_ready internally to match the specs update. This should not change anything for the users since the message type(36) stays unchanged, except in the logging all the appearance of funding_locked replated expression is replaced with channel_ready.

Bug Fixes

Fix a bug where lnd crashes when psbt data is not fully available.
Put back P2TR as default change type in batch_open_channel.
Fix log output.
Channels opened with custom fee policies are now able to forward payments correctly without needing to restart first.
Fix a bug where the funding manager would error out if no persisted initial forwarding policy is found for a channel.
The internal rebroacaster will no longer continue to rebroadcast stale sweeper transactions (have a conflict mined or in the mempool).

Contributors (Alphabetical Order)

ardevd
Elle Mouton
hieblmi
Oliver Gugger
Olaoluwa Osuntokun
Pierre Beugnet
Tommy Volk
Yong Yu
ziggie1984