👉 Bitcoin Optech #259

  • Describes a proposal to remove details from the LN specification that are no longer relevant to modern nodes.
  • includes ‘Waiting for confirmation #9: Policy proposal’ from our series about policies for transaction relay & mempool inclusion

Last week’s post described anchor outputs and CPFP carve out, ensuring either channel party can fee-bump their shared commitment transactions without requiring collaboration. This approach still contains a few drawbacks: channel funds are tied up to create anchor outputs, commitment transaction feerates typically overpay to ensure they meet mempool minimum feerates, and CPFP carve out only allows one extra descendant. Anchor outputs cannot ensure the same ability to fee-bump for transactions shared between more than two parties, such as coinjoins or multi-party contracting protocols. This post explores current efforts to address these and other limitations.