Abstract: [Purpose/Significance] This paper proposes a semantic chain sharing mechanism for heterogeneous government data based on blockchain, With regard to core issues such as data silos, "dirty data", uncertain data ownership, and lack of a trusted shared environment that arise during the open government data, and the key information involved in the sharing process is stored in the blockchain, and the whole network consensus mechanism ensures that the record can be traced and cannot be tampered, thus constructing a decentralized semantic data platform. [Method/Process] The use of distributed consensus mechanisms, chain structures and asymmetric encryption algorithms in blockchain combined with programmable smart contracts, through data semantic publishing, RDF management, search queries, blockchain interactions, entity disambiguation, etc. A series of processes, together with multi-source government data nodes, is to build a distributed semantic data transformation, fusion and reuse ecosystem with process monitoring. [Results/Conclusions] This study applies the blockchain technology to the semantic research of government data resources, which not only guarantees the semantic security of government data, but also solves the problem of semantic stagnation of blockchain. It is a relatively new research idea.

Key words: blockchain, decentralization, smart contract, open government data, linked data