public static ProtocolSpecBuilder constantinopleDefinition(
      final Optional<BigInteger> chainId,
      final boolean enableRevertReason,
      final EvmConfiguration evmConfiguration,
      final boolean isParallelTxProcessingEnabled,
      final MetricsSystem metricsSystem) {
    return byzantiumDefinition(
            chainId,
            enableRevertReason,
            evmConfiguration,
            isParallelTxProcessingEnabled,
            metricsSystem)
        .difficultyCalculator(MainnetDifficultyCalculators.CONSTANTINOPLE)
        .gasCalculator(ConstantinopleGasCalculator::new)
        .evmBuilder(MainnetEVMs::constantinople)
        .blockReward(CONSTANTINOPLE_BLOCK_REWARD)
        .name("Constantinople");
  }
Provides the various {@link ProtocolSpec}s on mainnet hard forks.
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolSpecs.java