Abstract
Nowadays, ȜBlockchain + Single Window(SW)”, as a potential solution to one-stop electronic platform, has been considered to open new opportunities to improve user experience quality of data, risk management and the operation, in SW. However, despite these opportunities hopefully enhancing the efficiency, transparency and reduce the cost in trade single window, there still exits challenges addressed including technical issue such as on-chain privacy-preserving, storage limitation and trade document provenances. In this paper, we put forward a model of data interchange based on blockchain to build trusted and coordinated architecture while guaranteeing robust blockchain for cross-border data sharing and verification in trade single window. First, a decentralized digital identity compliant W3C DID method is introduced to create self-sovereign identity layer for interoperability between all trade participants. Secondly, cipher-text policy attribute-based encryption(CP-ABE) scheme is integrated with the blockchain system to realize fine-grained access control and privacy protection for trade documents. Finally, we design an on-chain verification and off-chain data interchange protocol on inter-agency collaboration without revealing data. the theoretically analysis and computing simulation demonstrate the advantages of our proposed scheme.
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