Blockchain Based Content Addressable Decentralized Content Delivery Architecture

With growing demands for content distribution in the Internet,disadvantages of traditional distribution architectures are increasingly exposed: central architecture,high bandwidth cost,data loss,redundant information and inefficient content acquisition caused by domain name addressing.To construct a more efficient content distribution architecture is of great significance to the development of the Internet.Therefore,a content addressable decentralized distribution architecture is proposed in this paper.From the problem of central architecture and high bandwidth cost,this paper determines solutions to decentralization of network.Considering that the existing Digital Right Management(DRM)mechanism cannot avoid the expansion bottleneck and single point of failure caused by centralized authentication server,A distributed DRM mechanism based on blockchain is proposed,with which a decentralized network framework of high performance and extremely low cost can be achieved.The existing blockchain technology is not suitable for content distribution application because of low transaction efficiency,high latency and high requirements for computing and storage resources of devices.Therefore,some lightweight designs are applied to proposed DRM mechanism including block-free ledge technology,the algorithm of transaction selection based on proof of work,the data compressor mechanism and simplified transaction protocol.The simulation results demonstrate that the lightweight schemes can greatly reduce the demands for storage and computing resource,improve the system throughput and reduce the latency of authentication.From the problem of central data loss and inefficient content acquisition caused by domain name addressing,this paper determines a solution to build a content addressable decentralized storage architecture.A content addressable storage architecture is proposed based on Merkle DAG data structure and distributed hash table technology.In the context of high content redundancy,it can greatly improve the storage efficiency.Considering the application of storage architecture in wireless mobile scenarios and inefficient resource location and acquisition for unstable wireless channel,a selection algorithm based on content accessibility is proposed.The simulation results demonstrate that the algorithm can improve reliability of data and also the quality of service in the storage architecture.In summary,this paper studies the key technologies of content distribution architectures and proposes a content-addressable decentralized architecture.This paper focuses on the distributed DRM mechanism based on blockchain in decentralized environment.The lightweight designs make the architecture have broader prospects in the mobile Internet.In addition,the storage scheme in wireless mobile scenarios has high practical significance to solve the drawbacks of the current distribution architecture.