RBF splice funding transactions#4427

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jkczyz wants to merge 16 commits intolightningdevkit:mainfrom

jkczyz:2026-02-splicing-rbf

Commits on Mar 11, 2026

Emit SpliceFailed for acceptor contributions

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Accept tx_init_rbf for pending splice transactions

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f - Use even TLV type for last_funding_feerate_sat_per_1000_weight

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f - Defer last_funding_feerate update to on_tx_signatures_exchange

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Allow multiple RBF splice candidates in channel monitor

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Add rbf_channel API for initiating splice RBF

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Send tx_init_rbf instead of splice_init when a splice is pending

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Handle tx_ack_rbf on the initiator side

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Allow acceptor contribution to RBF splice via tx_init_rbf
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Preserve our funding contribution across counterparty RBF attempts

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f - Use even TLV type for contributions

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f - Test SpliceFailed for RBF acceptor contributions

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Consider prior contributions when filtering unique inputs/outputs

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Filter prior contributions from SpliceFundingFailed events

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f - Test feerate floor unchanged after failed RBF negotiation

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Handle FeeRateAdjustmentError variants in splice acceptor path

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