Research On Key Technologies And Applications Of Blockchain

Last few years,bitcoin based digital currency began to appear frequently in people's vision,but the underlying technology,blockchain,is more worthy of in-depth discussion and research.In recent years,more and more researchers and practitioners have applied blockchain technology to other industries due to its characteristics of decentralization,traceability and tampering.The consensus mechanism is an important reason that the blockchain can have the characteristics of decentralization,so that all nodes periodically complete the verification and recording of transactions,and keep the consistency of the blockchain data saved by all nodes.However,at present,there are two problems in the consensus mechanism of the public chain,one is that the degree of decentralization is not high,the other is that it is easy to split temporarily.The first work of this paper is to propose a proof of minimum(PoM)mechanism based on Hash random selection,which uses the computability,unidirectionality,anti-collision and obfuscation of hash algorithm to improve the degree of decentralization of blockchain and reduce the probability of temporary branching of blockchain.Theoretical analysis and experimental results show that PoM can not only increase the degree of decentralization of the blockchain,but also reduce the probability of temporary forks in the blockchain.Although blockchain is more real and reliable than the traditional centralized database,it is at the expense of a lot of storage space and computing power,and it can only store simple data,so it is not fully applicable to all application scenarios.In many cases,only relying on blockchain technology can not complete the transformation of the industry,but also need to combine other technical means.The second work of this paper is to propose two application scenarios based on blockchain and other technical means.The first is the music digital rightsmanagement scheme that supports the pre-sale of digital albums in the blockchain environment.The scheme uses block chain technology and IPFS to realize the whole process of digital album from storage,release to purchase in the block chain environment,and uses smart contract to realize the automatic distribution of revenue for service providers,key servers and all digital album creators,and supports the pre-sale function of digital album like the traditional music digital rights management.It can not only guarantee the fairness and transparency of digital rights trading,but also provide a flexible way for creators to release digital albums,and guarantee the revenue of creators and music media platforms.The second is the cold chain logistics scheme based on the Internet of things,blockchain and IPFS.This scheme uses the Internet of things,blockchain and smart contract to design a new cold chain logistics scheme.This scheme realizes the transportation process of agricultural products from farmers to warehouses to retailers in good storage state,ensures the credibility of environmental information stored in the transportation process of agricultural products by using the Internet of things,makes the data open and transparent by using the block chain storage environmental information,facilitates the supervision work of the supervision department,and uses the intelligent contract to develop real-time reward and punishment system to encourage the logistics company to protect Barrier agricultural products are stored in a suitable environment,so as to reduce the loss and waste of agricultural products in the transportation.