区块链技术利用分布式账本与密码学手段为数据隐私与交易安全提供了新的解决思路，其中的公证组跨链模型应用广泛，已成为不同领域中数据交易的解决方案之一。然而中心化的公证组模型具有固有的风险，且容易受到网络波动的影响。为此，提出了一种由公证人共同设计秘密的交易协议。首先改进PageRank算法，削弱公证人选择过程中的中心化程度，然后提出子秘密段表方案来优化阈值签名算法，在保持交易去中心化的同时增强了协议在网络环境波动中的鲁棒性。实验结果表明，在参与交易的公证人个数为50时，优化的节点选择算法对节点整体信誉值的均衡效果相较传统方案提升了47.3%，优化的阈值签名算法相较于标准阈值签名算法，在网络丢包率达70%的情况下，鲁棒性提升了约3倍，且其增加的时间开销和Gas成本可以忽略不计。本文提出的协议在几乎不增加交易成本的情况下，提升了交易的去中心化程度和鲁棒性，具有一定的可行性。
Blockchain technology leverages distributed ledgers and cryptographic techniques to offer novel solutions for data privacy and transaction security. Among various cross-chain solutions, the notary group-based model has been widely adopted for data exchange across various domains. However, the centralized architecture of traditional notary group models introduces inherent risks and remains susceptible to network fluctuations. To address the centralization issue in notary-based cross-chain technologies, this paper proposes a novel transaction protocol jointly designed by notaries. First, an improved PageRank algorithm is introduced to reduce centralization during notaries selection process. Then, a sub-secret segment table scheme is proposed to optimize the threshold signature algorithm, thereby enhancing the protocol’s robustness under network fluctuations while preserving decentralization. Experimental results show that with 50 participating notaries, the optimized node selection algorithm improves the overall balance of node reputation values by 47.3% compared to traditional approaches. Moreover, under a network packet loss rate of up to 70%, the optimized threshold signature algorithm achieves approximately three times the robustness of standard threshold signature schemes, with negligible additional time overhead and Gas costs. Overall, the proposed protocol significantly enhances decentralization and robustness of cross-chain transactions with minimal impact on transaction costs, demonstrating its practical feasibility.
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