In recent years, the number of smart devices has exploded, leading to an unprecedented increase in demand for video live and video-on-demand (VoD) services. Also, the privacy of video providers and requesters and the security of requested video data are much more threatened. In order to solve these issues, in this paper, a blockchain-enabled CMEC video transmission model (Bl-CMEC) for intelligent video caching and transcoding will be proposed to ensure the transactions’ transparency, system security, user information privacy, and integrity of the video data, enhance the ability of severs in actively caching popular video content in the CMEC system, and realize transcoding function at network edge nodes. Furthermore, we chose a scheme based on deep reinforcement learning (DRL) to intelligently access the intracluster joint caching and transcoding decisions. Then, the joint video caching and transcoding decision smart contract is specially designed to automatically manage the transaction process of the joint caching and transcoding service, which records key information of joint caching and transcoding transactions and payment information on a continuous blockchain. The simulation results demonstrate that the proposed Bl-CMEC framework not only can provide users with better QoE performance for video streaming service but also can ensure the security, integrity, and consistency for the video providers, video requesters, and video data.

中文翻译：

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集群 MEC 网络中支持区块链的智能视频缓存和转码

近年来，智能设备的数量呈爆炸式增长，导致对视频直播和视频点播（VoD）服务的需求空前增长。此外，视频提供者和请求者的隐私以及请求的视频数据的安全性受到更大威胁。为了解决这些问题，本文提出了一种基于区块链的CMEC视频传输模型（Bl-CMEC），用于智能视频缓存和转码，以确保交易的透明性、系统安全性、用户信息隐私和完整性。视频数据，增强服务器主动缓存CMEC系统中热门视频内容的能力，实现网络边缘节点的转码功能。此外，我们选择了基于深度强化学习 (DRL) 的方案来智能访问集群内联合缓存和转码决策。然后，联合缓存和转码决策智能合约专门用于自动管理联合缓存和转码服务的交易过程，将联合缓存和转码交易的关键信息和支付信息记录在一个连续的区块链上。仿真结果表明，所提出的 Bl-CMEC 框架不仅可以为用户提供更好的视频流服务 QoE 性能，而且可以确保视频提供者、视频请求者和视频数据的安全性、完整性和一致性。联合缓存转码决策智能合约专门用于自动管理联合缓存转码服务的交易过程，将联合缓存和转码交易的关键信息和支付信息记录在一个连续的区块链上。仿真结果表明，所提出的 Bl-CMEC 框架不仅可以为用户提供更好的视频流服务 QoE 性能，而且可以确保视频提供者、视频请求者和视频数据的安全性、完整性和一致性。联合缓存转码决策智能合约专门用于自动管理联合缓存转码服务的交易过程，将联合缓存和转码交易的关键信息和支付信息记录在一个连续的区块链上。仿真结果表明，所提出的 Bl-CMEC 框架不仅可以为用户提供更好的视频流服务 QoE 性能，而且可以确保视频提供者、视频请求者和视频数据的安全性、完整性和一致性。