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The early concept of knowledge graph originates from the idea of the Semantic Web, which aims at using structured graphs to model the knowledge of the world and record the relationships that exist between things. Currently publishing knowledge bases as open data on the Web has gained significant attention. In China, CIPS(Chinese Information Processing Society) launched the OpenKG in 2015 to foster the development of Chinese Open Knowledge Graphs. Unlike existing open knowledge-based programs, OpenKG chain is envisioned as a blockchain-based open knowledge infrastructure. This article introduces the first attempt at the implementation of sharing knowledge graphs on OpenKG chain, a blockchain-based trust network. We have completed the test of the underlying blockchain platform, as well as the on-chain test of OpenKG's dataset and toolset sharing as well as fine-grained knowledge crowdsourcing at the triple level. We have also proposed novel definitions: K-Point and OpenKG Token, which can be considered as a measurement of knowledge value and user value. 1033 knowledge contributors have been involved in two months of testing on the blockchain, and the cumulative number of on-chain recordings triggered by real knowledge consumers has reached 550,000 with an average daily peak value of more than 10,000. For the first time, We have tested and realized on-chain sharing of knowledge at entity/triple granularity level. At present, all operations on the datasets and toolset in OpenKG.CN, as well as the triplets in OpenBase, are recorded on the chain, and corresponding value will also be generated and assigned in a trusted mode. Via this effort, OpenKG chain looks to provide a more credible and traceable knowledge-sharing platform for the knowledge graph community.

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As a typical course of which contents are full of "text", "engineering bidding" always exists challenges and difficulties in the "teaching" for the science and engineering teachers and in the "learning" for the students. This paper takes the "engineering bidding" course as an example, and puts forward the design principle of the teaching method based on the integration of problem chain and mind map. It clarifies the design method of problem chain in teaching, the application method of "Hall Three-dimensional Structure" model in the construction of knowledge system, and how to use flipped classroom, logical reasoning and 5W1H to enhance the application of problem chain and mind map before, during and after class. Through the integration, the students can construct a framework of knowledge system more effectively. It can also mobilize the initiative of students, improve the fun and efficiency of the classroom as well as stimulate the innovation of learning.