The byzantine agreement protocol has a disadvantage that there are many limitations on node scalability, because the performance degradation may occur due to a large amount of traffic. Hence, this classical byzantine agreement algorithm seems to be infeasible to achieve scale-out performance with the same level of security as a Bitcoin. In order to improve the performance degradation due to a large amount of traffic, we propose the hierarchical consensus mechanism based on service-zone sharding rather than how all nodes participate in the consensus process. In the proposed consensus mechanism (SZHBFT), a disjoint set of transactions is locally processed by a secure consensus subgroup or globally processed between consensus subgroups. Thus, the transactions that occur related to multiple Service-Zone Consensus Groups are updated and maintained in the Inter-Service Zone Public Ledger, whereas service transactions occurring locally are processed in parallel by each Service-Zone Consensus Group and then distributed into a local Service-Zone Private Ledger. The scheme of the proposed SZHBFT mechanism provides the hierarchical agreement solution along with distributed multiledger structure for the scalable byzantine resilient agreement by forming secure consensus subgroups in order to minimize the overhead of overall communication messages.

中文翻译：

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基于服务区分片的分层共识机制设计

拜占庭协议协议有一个缺点，就是节点的可扩展性有很多限制，因为大量的流量可能会导致性能下降。因此，这种经典的拜占庭协议算法似乎无法以与比特币相同的安全级别实现横向扩展性能。为了改善由于大量流量导致的性能下降，我们提出了基于服务区分片的分层共识机制，而不是所有节点如何参与共识过程。在提议的共识机制（SZHBFT）中，一组不相交的交易由安全共识子组本地处理或在共识子组之间全局处理。因此，与多个 Service-Zone Consensus Group 相关的交易在 Inter-Service Zone Public Ledger 中更新和维护，而本地发生的服务交易由每个 Service-Zone Consensus Group 并行处理，然后分发到本地 Service-Zone私人账本。所提出的 SZHBFT 机制的方案通过形成安全的共识子组以最小化整体通信消息的开销，为可扩展的拜占庭弹性协议提供分层协议解决方案和分布式多账本结构。