Update fee and dust handling for zero fee channels#3884

Merged

TheBlueMatt merged 10 commits intolightningdevkit:mainfrom

carlaKC:3789-fees-and-dust

Jul 17, 2025

Commits on Jul 16, 2025

ln/refactor: add utility to get commitment feerate by channel type
carlaKC
committed
ln: return Option for dust_exposure_limiting_feerate
carlaKC
committed
ln: add channel type awareness to get_dust_exposure_limiting_feerate

carlaKC
and
TheBlueMatt
committed
ln: remove unnecessary nonzero anchor channel check in build_htlc_output
carlaKC
committed
ln/refactor: move success/timeout dust limits into helper
carlaKC
committed
ln: set zero second stage fees for zero fee commitments
carlaKC
committed
ln: return early and assert in fee calculation and checks

carlaKC
and
TheBlueMatt
committed
ln: do not send and reject receive of update_fee for zero fee commits

carlaKC
and
TheBlueMatt
committed
ln: add test helper for fee spike buffer test and use TxBuilder
carlaKC
committed
ln: do not maintain fee spike buffer for zero fee commitment channels
carlaKC
committed