fn install_watch_outpoint(&self, _outpoint: (Sha256dHash, u32), _out_script: &Script) { }
fn watch_all_txn(&self) { }
fn register_listener(&self, _listener: Weak<ChainListener>) { }
fn install_watch_outpoint(&self, _outpoint: (Sha256dHash, u32), _out_script: &Script) { }
fn watch_all_txn(&self) { }
fn register_listener(&self, _listener: Weak<ChainListener>) { }