fn install_watch_tx(&self, _txid: &Sha256dHash, _script_pub_key: &Script) { }
fn install_watch_outpoint(&self, _outpoint: (Sha256dHash, u32), _out_script: &Script) { }
fn watch_all_txn(&self) { }
fn install_watch_tx(&self, _txid: &Sha256dHash, _script_pub_key: &Script) { }
fn install_watch_outpoint(&self, _outpoint: (Sha256dHash, u32), _out_script: &Script) { }
fn watch_all_txn(&self) { }