With the advent of a hyper-connected society, expectations for blockchain technology and its potential have increased. Blockchain technology is emerging as a method to solve security vulnerabilities in the IoT and mobile devices that are already used in various industrial fields. However, the security problem is still one of the most critical issues. The conventional blockchain has a problem in which the performance decreases as the number of participants increases because all of the users participate in the verification. As a result, it is not suitable for traditional IoT and mobile environments in which resources are limited.

This work presents an approach of applying a blockchain system in a D2D (Device-to-Device) environment and proposes solutions for the problems of conventional mobile device communication and blockchain consensus algorithms. After a blockchain system in a wireless network environment is separated into an off-blockchain and an on-blockchain, the divided blockchains are processed in three steps. In the first stage of 0ff-blockchain, our proposal confirms the safety of IoT devices that transfer confidential data. In the next stage, the devices reduce the risk of eavesdropping from a third party by calculating the security capacity using the resources of the mobile devices which register for membership on a private blockchain. In the last stage, the devices join the blockchain consensus process. The reliability of the consensus and the performance of the system are improved through calculation of the real participation probability of the participants by the communication elements and by determining whether each node is a selfish participant. As a result, our work proposes a consensus algorithm suitable for D2D communication and a SBC(Selective Blockchain) system considering environmental characteristics.

随着高度互联的社会的到来，人们对区块链技术及其潜力的期望越来越高。区块链技术正在作为一种解决IoT和移动设备中已经在各个工业领域中使用的安全漏洞的方法而兴起。但是，安全问题仍然是最关键的问题之一。传统的区块链存在一个问题，即由于所有用户都参与了验证，因此性能随着参与者数量的增加而降低。因此，它不适用于资源受限的传统物联网和移动环境。

这项工作提出了一种在D2D（设备到设备）环境中应用区块链系统的方法，并提出了针对传统移动设备通信和区块链共识算法问题的解决方案。将无线网络环境中的区块链系统分为区块链外区块链和区块链上区块链之后，分割后的区块链将分三步处理。在0ff区块链的第一阶段，我们的建议确定了传输机密数据的IoT设备的安全性。在下一阶段，这些设备通过使用在私有区块链上注册成为成员的移动设备的资源来计算安全容量，从而降低了窃听第三方的风险。在最后阶段，设备加入了区块链共识流程。通过通信元件计算参与者的实际参与概率并确定每个节点是否是自私的参与者，可以提高共识的可靠性和系统的性能。因此，我们的工作提出了一种适用于D2D通信的共识算法和一种考虑环境特征的SBC（选择性区块链）系统。