Table 1.

Research overview.

Category	Research content	References
Blockchain policy related	Analysis of government subsidy policies through different supply chains	[22–24]
Blockchain based food or crop traceability solution	Solve the traceability problems of existing food or crops through blockchain technology	[5, 6, 9, 15, 21, 25–29]
Solutions to storage problems in food and other industries based on blockchain multichain structure	Solve the problems of low efficiency and low throughput caused by the increase of data information that cannot be matched by the single chain structure through blockchain multichain	[18–20, 26, 27, 30–33]
Solutions to food or crop traceability or supervision based on smart contract technology	Solve the problems of traceability or low regulatory efficiency and high cost through blockchain smart contract technology	[5, 16, 34–36]