class ByzantiumConfig extends Eip160HFConfig {

    @Override
    public BigInteger getCalcDifficultyMultiplier(BlockHeader curBlock, BlockHeader parent) {
        long unclesAdj = parent.hasUncles() ? 2 : 1;
        return BigInteger.valueOf(Math.max(unclesAdj - (curBlock.getTimestamp() - parent.getTimestamp()) / 9, -99));
    }

    public  ByzantiumConfig(BlockchainConfig parent);

}