class EIP1559 {

  public boolean isValidBaseFee(final long parentBaseFee, final long baseFee) {
    guardActivation();
    return Math.abs(baseFee - parentBaseFee)
        <= Math.max(1, parentBaseFee / feeMarket.getBasefeeMaxChangeDenominator());
  }

  public  EIP1559(final long forkBlockNumber);

}