@Override
    public String toString() {
        return toString(null);
    }
@Test
    public void toString_() {
        TransactionOutput p2pk = new TransactionOutput(null, Coin.COIN, myKey);
        p2pk.toString();
        TransactionOutput p2pkh = new TransactionOutput(null, Coin.COIN, myKey.toAddress(ScriptType.P2PKH,
                BitcoinNetwork.TESTNET));
        p2pkh.toString();
        TransactionOutput p2wpkh = new TransactionOutput(null, Coin.COIN, myKey.toAddress(ScriptType.P2WPKH,
                BitcoinNetwork.TESTNET));
        p2wpkh.toString();
    }