Experimental datasets.

In order to foster a modern economic system and facilitate high-quality economic development, it is crucial to establish a conducive business environment. Undoubtedly, the evaluation of the business environment for enterprises constitutes a prominent area of research. Nevertheless, ensuring the authenticity and security of the raw data sources provided by participating enterprises poses a challenge, thereby compromising the accuracy of the evaluation. To tackle this issue, an enterprise composite blockchain construction method for business environment is proposed in this paper, which stores the raw data of enterprises by the means of hybrid on-chain and off-chain. Initially, the enhanced hash function SHA256 is introduced to encrypt the raw data of enterprises. The encrypted data is subsequently stored in an off-chain Level DB database, which is based on non-volatile memory. This approach effectively alleviates the burden on communication and storage. Secondly, a composite storage strategy on-chain is adopted: the key values from the Level DB are stored in the DAG-based Conflux public blockchain, while the enterprise state data is stored in the consortium blockchain, so as to provide trusted evidence of business environment evaluation data. Finally, it is demonstrated through a large number of experimental comparisons that the enterprise composite blockchain construction method proposed in this paper exhibits better read and write performance, lower storage efficiency and storage overhead, and outperforms both the before-improved Level DB database and existing blockchain storage models.

为构建现代化经济体系、助力高质量经济发展，营造优良营商环境至关重要。毋庸置疑，企业营商环境评估是重要的研究方向。然而，参与企业提供的原始数据源的真实性与安全性难以保障，这会削弱评估结果的准确性。
为解决这一问题，本文提出一种面向营商环境的企业复合区块链构建方法，采用链上与链下混合存储的方式存储企业原始数据。
首先，引入增强型哈希函数SHA256对企业原始数据进行加密，加密后的数据存储于基于非易失性内存（non-volatile memory）的链下LevelDB数据库中，该方案可有效缓解通信与存储负载。其次，采用复合链上存储策略：将LevelDB的键值对存储于基于有向无环图（Directed Acyclic Graph，DAG）的Conflux公有区块链，而企业状态数据则存储于联盟链（consortium blockchain）中，以此为营商环境评估数据提供可信凭证。
最后，经大量对比实验验证，本文提出的企业复合区块链构建方法具备更优异的读写性能、更低的存储效率与存储开销，且性能优于改进前的LevelDB数据库及现有区块链存储模型。