public String getParentBeaconBlockRoot() {
    return JsonUtil.getValueAsString(
        genesisRoot,
        "parentbeaconblockroot",
        "0x0000000000000000000000000000000000000000000000000000000000000000");
  }
Gets parent beacon block root.

@return the parent beacon block root
config/src/main/java/org/hyperledger/besu/config/GenesisConfig.java