public static String createGenesisExtraDataString(final List<Address> validators) {
    return CliqueExtraData.createWithoutProposerSeal(Bytes.wrap(new byte[32]), validators)
        .toString();
  }
Create genesis extra data string.

@param validators the validators
@return the string
consensus/clique/src/main/java/org/hyperledger/besu/consensus/clique/CliqueExtraData.java