Blockchain enables users to be autonomous without the need of trust by using a digital ledger of decentralized consensus. Blockchain-based IoT allows service providers to transfer the security and maintenance responsibility to self-maintaining customers. Adopting peer-to-peer (P2P) networking and computing for more than billions of transactions can reduce the costs arising from the installation and maintenance of centralized systems. Small manufacturers providing industrial IoT (IIoT) services can participate more actively in blockchain-based IIoT applications with three-dimensional printing and digital manufacturing technologies, but the measure to maintain privacy on a blockchain is not robust. Here, we propose a P2P networking-based custom manufacturing service, which is an order-driven trading service between a manufacturer and a customer in the blockchain-based IIoT architecture. The proposed system consists of reputation management and service architecture. We propose a new reputation assessment method customized to increase the reliability and accuracy of industrial manufacturing systems. We also propose a manufacturer rating classification to guide the customers’ decision making in a reliable manner and a malicious evaluator identification to exclude feedbacks from malicious evaluators. The proposed service architecture is composed of trustless P2P protocols designed for preserving privacy and providing non-repudiation. We used a cryptographic algorithm for ensuring transaction privacy and the digital signing of blockchain for non-repudiation. We also analyzed the proposed service architecture and the possible attack scenarios to verify the security requirements. We verified that the reputation management system was influenced by each feedback dynamically and guided the customer’s present decision making with reliable and classified manners, by simulating reputation classification and malicious evaluator identification. Further, we have summarized the originality and the characteristics of the proposed approach by comparing closely related studies and concluded with a future research guide.

中文翻译：

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对等网络环境中用于定制制造服务的基于区块链的信誉管理

区块链通过使用分散式共识的数字账本，使用户无需信任就可以自治。基于区块链的物联网使服务提供商可以将安全和维护责任转移给自我维护的客户。对超过数十亿笔交易采用点对点（P2P）网络和计算可以减少由于安装和维护集中式系统而产生的成本。提供工业物联网（IIoT）服务的小型制造商可以通过三维打印和数字制造技术更积极地参与基于区块链的IIoT应用程序，但是维护区块链隐私的措施并不健全。在这里，我们提出了一种基于P2P网络的定制制造服务，这是基于区块链的IIoT架构中制造商和客户之间的订单驱动交易服务。所提出的系统包括信誉管理和服务体系结构。我们提出了一种新的信誉评估方法，该方法经过定制，可以提高工业制造系统的可靠性和准确性。我们还建议制造商评级分类，以可靠的方式指导客户的决策，并提出恶意的评估者身份，以排除恶意评估者的反馈。所提出的服务体系结构由旨在保护隐私和提供不可否认性的不信任P2P协议组成。我们使用了一种加密算法来确保交易隐私和区块链的数字签名以实现不可否认性。我们还分析了建议的服务体系结构和可能的攻击情形，以验证安全性要求。我们验证了信誉管理系统受到每个反馈的动态影响，并且通过模拟信誉分类和恶意评估者识别，以可靠和分类的方式指导了客户当前的决策。此外，我们通过比较密切相关的研究总结了所提出方法的独创性和特征，并以未来的研究指南作为总结。通过模拟信誉分类和恶意评估者识别。此外，我们通过比较密切相关的研究总结了所提出方法的独创性和特征，并以未来的研究指南作为总结。通过模拟信誉分类和恶意评估者识别。此外，我们通过比较密切相关的研究总结了所提出方法的独创性和特征，并以未来的研究指南作为总结。