/// The witness in the spending input, is, thus, simply:
/// <BIP 143 signature> <payment key>
///
/// These are generally the result of our counterparty having broadcast the current state,
/// allowing us to claim the non-HTLC-encumbered outputs immediately.
/// The witness in the spending input, is, thus, simply:
/// <BIP 143 signature> <payment key>
///
/// These are generally the result of our counterparty having broadcast the current state,
/// allowing us to claim the non-HTLC-encumbered outputs immediately.