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Bump default CLTV delta on in-flight HTLCs to 4 days of blocks #2250

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Bump default CLTV delta on in-flight HTLCs to 4 days of blocks #2250

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8 changes: 6 additions & 2 deletions lightning/src/util/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -346,7 +346,11 @@ pub struct ChannelConfig {
/// enough time to broadcast and confirm a transaction, possibly with time in between to RBF
/// the spending transaction).
///
/// Default value: 72 (12 hours at an average of 6 blocks/hour).
/// When setting this value, consider how long it may take to upgrade node(s) after a bug
/// was discovered and a patch released. While not all potential sources of error can be
/// recovered, some classes of bugs may allow this much time to react.
///
/// Default value: 576 (96 hours at an average of 6 blocks/hour).
/// Minimum value: [`MIN_CLTV_EXPIRY_DELTA`], any values less than this will be treated as
/// [`MIN_CLTV_EXPIRY_DELTA`] instead.
///
Expand Down Expand Up @@ -405,7 +409,7 @@ impl Default for ChannelConfig {
ChannelConfig {
forwarding_fee_proportional_millionths: 0,
forwarding_fee_base_msat: 1000,
cltv_expiry_delta: 6 * 12, // 6 blocks/hour * 12 hours
cltv_expiry_delta: 96 * 12, // 8 blocks/hour * 12 hours
max_dust_htlc_exposure_msat: 5_000_000,
force_close_avoidance_max_fee_satoshis: 1000,
}
Expand Down