Make minimum channel reserve configurable #1
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Add configurable min_their_channel_reserve_satoshis field to ChannelHandshakeConfig, allowing users to set the minimum channel reserve value. Special case: When set to 0, the dust limit check is bypassed. This enables LSP use cases where clients are able to fully withdraw their funds from the channel without closing it. For non-zero values below the dust limit, validation still enforces the dust limit. Replaces hardcoded MIN_THEIR_CHAN_RESERVE_SATOSHIS constant with configurable value while maintaining backward compatibility. Default remains 1000 sats to preserve existing behavior.
| announce_for_forwarding: false, | ||
| commit_upfront_shutdown_pubkey: true, | ||
| their_channel_reserve_proportional_millionths: 10_000, | ||
| min_their_channel_reserve_satoshis: 1_000, |
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probably use MIN_THEIR_CHAN_RESERVE_SATOSHIS?
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This change basically deprecates that constant as it's no longer a real constant. Although I should double check if that constant is actually exposed publicly and remove it if not.
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min_their_channel_reserve_satoshis should only be set to 0 on channels between lsp-client, so I guess this will need to be set not as a general config but as a ChannelHandshakeConfig, so min_their_channel_reserve_satoshis needs to be added to ChannelHandshakeConfigUpdate and then to the ChannelHandshakeConfig::apply |
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f3r10
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Add configurable min_their_channel_reserve_satoshis field to ChannelHandshakeConfig, allowing users to set the minimum channel reserve value. Special case: When set to 0, the dust limit check is bypassed. This enables LSP use cases where clients are able to fully withdraw their funds from the channel without closing it. For non-zero values below the dust limit, validation still enforces the dust limit. Replaces hardcoded MIN_THEIR_CHAN_RESERVE_SATOSHIS constant with configurable value while maintaining backward compatibility. Default remains 1000 sats to preserve existing behavior.
f3r10
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Jan 20, 2026
Add configurable min_their_channel_reserve_satoshis field to ChannelHandshakeConfig, allowing users to set the minimum channel reserve value. Special case: When set to 0, the dust limit check is bypassed. This enables LSP use cases where clients are able to fully withdraw their funds from the channel without closing it. For non-zero values below the dust limit, validation still enforces the dust limit. Replaces hardcoded MIN_THEIR_CHAN_RESERVE_SATOSHIS constant with configurable value while maintaining backward compatibility. Default remains 1000 sats to preserve existing behavior.
f3r10
pushed a commit
that referenced
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Jan 20, 2026
Add configurable min_their_channel_reserve_satoshis field to ChannelHandshakeConfig, allowing users to set the minimum channel reserve value. Special case: When set to 0, the dust limit check is bypassed. This enables LSP use cases where clients are able to fully withdraw their funds from the channel without closing it. For non-zero values below the dust limit, validation still enforces the dust limit. Replaces hardcoded MIN_THEIR_CHAN_RESERVE_SATOSHIS constant with configurable value while maintaining backward compatibility. Default remains 1000 sats to preserve existing behavior.
f3r10
pushed a commit
that referenced
this pull request
Jan 20, 2026
Add configurable min_their_channel_reserve_satoshis field to ChannelHandshakeConfig, allowing users to set the minimum channel reserve value. Special case: When set to 0, the dust limit check is bypassed. This enables LSP use cases where clients are able to fully withdraw their funds from the channel without closing it. For non-zero values below the dust limit, validation still enforces the dust limit. Replaces hardcoded MIN_THEIR_CHAN_RESERVE_SATOSHIS constant with configurable value while maintaining backward compatibility. Default remains 1000 sats to preserve existing behavior.
amackillop
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Jan 21, 2026
Add configurable min_their_channel_reserve_satoshis field to ChannelHandshakeConfig, allowing users to set the minimum channel reserve value. Special case: When set to 0, the dust limit check is bypassed. This enables LSP use cases where clients are able to fully withdraw their funds from the channel without closing it. For non-zero values below the dust limit, validation still enforces the dust limit. Replaces hardcoded MIN_THEIR_CHAN_RESERVE_SATOSHIS constant with configurable value while maintaining backward compatibility. Default remains 1000 sats to preserve existing behavior.
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Add configurable
min_their_channel_reserve_satoshisfield toChannelHandshakeConfig, allowing users to set the minimum channel reserve value.Special case: When set to 0, the dust limit check is bypassed. This enables LSP use cases where clients are able to fully withdraw their funds from the channel without closing it. For non-zero values below the dust limit, validation still enforces the dust limit.
Replaces hardcoded
MIN_THEIR_CHAN_RESERVE_SATOSHISconstant with configurable value while maintaining backward compatibility. Default remains 1000 sats to preserve existing behavior.Discussion
I went with a configurable amount here but in the end I am left wondering if just a boolean to remove the reserve is better especially given the special handling of the zero case. Is the flexibility to set whatever one wants really needed? For us we just want it to be zero.
Also just found this related issue which notes some specs for this