Eclair Merges Fee Fixes

Eclair Lightning implementation merged two fixes to prevent nodes from paying excessive Bitcoin mining fees during collaborative channel funding and transaction construction.

“A malicious peer could make us pay mining fees at an arbitrary feerate, while contributing nothing”

First Fix Limits Fee Rate

The first change, merged Oct. 2, 2026, limits the fee rate a peer can impose during a replace-by-fee transaction involving a dual-funded channel opening or a splice.

Second Fix Checks Fee Accuracy

The second fix, merged Oct. 5, 2026, addresses Eclair-signer mode by calculating actual fees and rejecting invalid change-output positions.

“We now check that the rebuilt contributions pay exactly the fee we verified on the funded transaction”