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Add option to sign commitments at various feerates (FEAT 32/33) #1036

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Commits on Oct 27, 2022

  1. Add option to sign commitments at various feerates

    When using `option_anchors`, nodes must keep a pool of utxos available
    to set the fees of commitment and HTLC transactions at broadcast time.
    This is a complex task that requires sophisticated utxo management to
    efficiently protect against malicious peers.
    
    The `option_alternative_feerates` feature reduces that complexity, by
    making it possible for nodes to have versions of HTLC transactions at
    various feerates, which may remove the need to add external inputs in
    most cases and keep them for exceptional occasions, at the expense of
    slightly more latency, bandwidth and storage usage.
    t-bast committed Oct 27, 2022
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