/// A script pubkey for shutting down a channel as defined by [BOLT #2].
///
/// [BOLT #2]: https://github.com/lightning/bolts/blob/master/02-peer-protocol.md
/// A script pubkey for shutting down a channel as defined by [BOLT #2].
///
/// [BOLT #2]: https://github.com/lightning/bolts/blob/master/02-peer-protocol.md