@VisibleForTesting
  static BaseFeeMarket cancunDefault(
      final long londonForkBlockNumber, final Optional<Wei> baseFeePerGasOverride) {
    return new BlobFeeMarket(
        londonForkBlockNumber,
        baseFeePerGasOverride,
        BlobSchedule.CANCUN_DEFAULT.getBaseFeeUpdateFraction());
  }
Creates a Blob fee market with default Cancun blob schedule parameters.

@param londonForkBlockNumber the block number at which the London fork activates.
@param baseFeePerGasOverride an optional override for the base fee per gas.
@return a {@link BaseFeeMarket} instance for the Cancun fork with default blob schedule.
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/feemarket/FeeMarket.java