lightningd: default public htlc_maximum_msat to 25% of channel capacity#9311
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nGoline wants to merge 2 commits into
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lightningd: default public htlc_maximum_msat to 25% of channel capacity#9311nGoline wants to merge 2 commits into
nGoline wants to merge 2 commits into
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… capacity The Oakland privacy proposal (Lightning Dev Summit) observes that probing for where payments went is much harder when the htlc maximum is well below the publicly-known channel capacity. Default public channels to 25% of capacity; update the setchannel test to expect this, xfail until the next commit implements it. Changelog-None
For publicly announced channels, when --htlc-maximum-msat is not set, advertise 25% of the channel capacity (capped by what we can actually send) rather than the full capacity: a maximum well below the publicly known capacity makes probing for where payments flow much harder. Private channels, whose capacity is not public, keep the full default. Changelog-Changed: Config: public channels now default `htlc-maximum-msat` to 25% of capacity (was full capacity), for better payment privacy.
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Implements the "Oakland" privacy proposal from the Lightning Dev Summit (reaffirmed at the Vienna summit): for publicly announced channels, default the advertised
htlc_maximum_msatto 25% of channel capacity (capped by what we can actually send) when the operator has not set--htlc-maximum-msat. A maximum well below the publicly-known capacity makes probing for where payments flow significantly harder.Scope:
--htlc-maximum-msatorsetchannel.Closes #9173