Research On Retrieval Method For Blockchain-based Digital Asset Transaction

The digital economy have attracted more and more attention in recent years,such as supply chain management,electronic government,electronic commerce.Users'retrieval demand has been shifted from information check to information security assurance,efficient retrieval and so on,where exists many challenges.As a new product of internet,blockchain technology can solve the problems of information asymmetry,information tamper and multi-party trust,and has been widely applied to various fields.Blockchain-based retrieval methods arose at the same time.Most existing methods use blockchain as a data storage tool for asset information retrieval,the description of digital asset is recorded on the blockchain in forms of transaction.However,on the one hand,methods like this are highly dependent on traversing all of the blocks,which is inefficiency.On the other hand,it is difficult to describe the diversified transactions with multi-factor association,for example,the car asset is consisting of lights and tires,the receipt asset depends on the order asset.Most existing methods lack the support for complex transactions between digital assets,the handling and retrieval of relationships between multiple asset,which has serious implications for the feasibility of retrieval method on blockchain.This paper investigates the problem of blockchain-based retrieval methods,and points out their shortages.In order to better meet the demand of efficient retrieval,this paper propose a retrieval mechanism based on blockchain.The major contributions are as follows:(1)We propose a novel digital asset transaction model that supports retrieving information.Firstly,we define the concept of asset,transaction and stakeholder in the asset lifecycle,which can recover the transfer situation of asset.Secondly,we introduce a transaction model that support the complex transaction,and can describe the relation between assets.Finally,we propose a hybrid indexing mechanism that embeds the index data into the transaction record data.The indexing mechanism can provide theoretical supporting for the efficient retrieval that tamper-resistant are guaranteed.(2)We propose a transaction retrieval mechanism.The model uses asset status tree to maintain the latest status for each asset,and reduces the amount of time of updating the asset's status.By tracing the involved transactions of the asset lifecycle,the whole transfer process of the asset is presented,achieving the purpose of traceability to a single asset transaction.The experimental results prove the effectiveness of the proposed model.(3)We propose a relation retrieval mechanism and the strategy of consistency guarantee.We retrieve related assets for a specific asset and analyze the types of relations between assets to construct the temporal relation network.To guarantee the relation consistency across platforms,we introduce a mechanism for relation constraint and validation rules,which include the operation type,asset status and stakeholder.The experimental results show that our model has a better performance in retrieving asset relationships.