/// Key derivation parameters are accessible through a per-channel secrets
/// Sign::channel_keys_id and is provided inside DynamicOuputP2WSH in case of
/// onchain output detection for which a corresponding delayed_payment_key must be derived.
/// Key derivation parameters are accessible through a per-channel secrets
/// Sign::channel_keys_id and is provided inside DynamicOuputP2WSH in case of
/// onchain output detection for which a corresponding delayed_payment_key must be derived.