locked,
    });

    Ok(
      "0000000000000000000000000000000000000000000000000000000000000000"
        .parse()
        .unwrap(),
    )
  }

  fn get_transaction(
    &self,
    txid: Txid,
    _include_watchonly: Option<bool>,
  ) -> Result<Value, jsonrpc_core::Error> {
    match self.state.lock().unwrap().transactions.get(&txid) {
      Some(tx) => Ok(
        serde_json::to_value(GetTransactionResult {
          info: WalletTxInfo {
            txid,
            confirmations: 0,
            time: 0,
            timereceived: 0,
            blockhash: None,
            blockindex: None,
            blockheight: None,
            blocktime: None,
            wallet_conflicts: Vec::new(),
            bip125_replaceable: Bip125Replaceable::Unknown,
          },
          amount: SignedAmount::from_sat(0),
          fee: None,
          details: Vec::new(),
          hex: serialize(tx),
        })
        .unwrap(),
      ),
      None => Err(jsonrpc_core::Error::new(
        jsonrpc_core::types::error::ErrorCode::ServerError(-8),