The Internet of Vehicles (IoV) is a distributed network that enables vehicles to connect to each other and to various infrastructure and smart devices, in order to exchange data and provide important services. The highly dynamic environment of the IoV offers a lot of opportunities but at the same time makes the network susceptible to a large number of security attacks. In this paper, we propose a framework that comprises a private blockchain model to secure the transactions that are generated by vehicles. Our model makes use of our proposed Proof of Accumulated Trust (PoAT) mechanism that selects specific RSUs to become blockchain miners based on their accumulated trust. In addition, the proposed system introduces a smart redundancy method in which each vehicle and RSU sends a transaction to multiple destinations, in order to avoid the situation when one or more IoV nodes are compromised. We conduct extensive experiments in which we compare our system to two recent blockchain-based security frameworks for the IoV. The simulation results illustrate the superiority of our system in terms of attack detection rate, blockchain generation time, and network overhead traffic.

车联网（IoV）是一种分布式网络，使车辆能够相互连接并连接到各种基础设施和智能设备，以交换数据并提供重要服务。车联网的高度动态环境提供了很多机会，但同时也使网络容易受到大量安全攻击。在本文中，我们提出了一个包含私有区块链模型的框架，以保护车辆产生的交易。我们的模型利用了我们提出的累积信任证明 (PoAT) 机制，该机制根据他们累积的信任选择特定的 RSU 成为区块链矿工。此外，所提出的系统引入了一种智能冗余方法，其中每辆车和 RSU 将事务发送到多个目的地，以避免出现一个或多个车联网节点被攻破的情况。我们进行了广泛的实验，将我们的系统与两个最近的基于区块链的 IoV 安全框架进行了比较。仿真结果说明了我们的系统在攻击检测率、区块链生成时间和网络开销流量方面的优越性。