@Provides
  @Named("frontier")
  public ProtocolSpecBuilder frontierProtocolSpec(
      final EvmConfiguration evmConfiguration,
      final boolean isParalleltxEnabled,
      final MetricsSystem metricsSystem) {
    return MainnetProtocolSpecs.frontierDefinition(
        evmConfiguration, isParalleltxEnabled, metricsSystem);
  }
Provides the protocol spec for the frontier network fork.

@param evmConfiguration the EVM configuration
@param isParalleltxEnabled whether parallel tx processing is enabled
@param metricsSystem the metrics system
@return the protocol spec for the frontier network fork
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/components/ProtocolSpecModule.java