contractcourt: properly bump justice transactions #9426
Labels
contracts
enhancement
Improvements to existing features / behaviour
security
General label for issues/PRs related to the security of the software
utxo sweeping
Currently justice transactions use a confirmation target of 2, which should usually get them confirmed quickly. But if we get unlucky and mempool fee rates rise after we've created the justice transactions, the justice transactions can get stuck in the mempool for a long time, potentially long enough for the counterparty to claim their channel balance and escape justice.
Implementation
Ideally we'd be able to leverage the new sweeper to automatically bump fees every block. The problem is that we do need to maintain the custom logic to split the justice transaction into pinnable (i.e. HTLC claims) and non-pinnable (i.e. balance claim) groups after a few blocks delay, and we need to make sure that the non-pinnable group doesn't get any pinnable outputs from other channels grouped with it.
I think @yyforyongyu was working on "sweeper groups" at some point, which seems useful here to prevent aggregation.
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