public static String normalizeKey(final String key) {
    return key.toLowerCase(Locale.US);
  }
Converts the key to lowercase for easier lookup. This is useful in cases such as the
'genesis.json' file where all keys are assumed to be case insensitive.

@param key the key to be normalized
@return key in lower case.
config/src/main/java/org/hyperledger/besu/config/JsonUtil.java