Hedera一致性服务中单个主题的多个提交密钥

在Hedera Consensus Service中，可以使用单个密钥为主题进行提交，但有时需要使用多个密钥来对同一主题进行提交，以提高安全性或方便管理。为此，可以使用Hedera SDK提供的setSubmitKeyList()方法来设置多个提交密钥。下面是一个示例代码：

import com.hedera.hashgraph.sdk.AccountId;
import com.hedera.hashgraph.sdk.ConsensusSubmitMessageTransaction;
import com.hedera.hashgraph.sdk.HederaException;
import com.hedera.hashgraph.sdk.KeyList;
import com.hedera.hashgraph.sdk.TopicId;

public class ExampleSetMultiSubmitKey {
    public static void main(String[] args) throws HederaException {
        var operatorId = AccountId.fromString("0.0.12345");
        var operatorKey = Key.fromString("302a300506032b65700321006d4c87bccb0de5c7c7d09a5b83353e0d4d71c9f1aaaea8680f08ef080c557c8");
        var topicId = TopicId.fromString("0.0.54321");

        // Set up multiple submit keys
        var submitKeyList = new KeyList();
        submitKeyList.addKey(Key.fromString("302a300506032b65700321009c170ba8a065320328d8aa891f3c3e2d6746d11ea0f7e5d8d51f015c0aad8f733"));
        submitKeyList.addKey(Key.fromString("302a300506032b6570032100d2d6bd8ddf6f63c80d27e1d53d5a864e42796fab9eebd52bf986d852c08f341e"));

        // Set the submit keys for the topic
        var tx = new ConsensusSubmitMessageTransaction()
            .setTopicId(topicId)
            .setMessage("Hello Hedera!")
            .setSubmitKeyList(submitKeyList)
            .execute(client);

        System.out.println("Topic message " + tx.getConsensus