Table 5 Smart contract logic design.

Upload Biological Risk Factor BBPR-AC Access Control Information

addSubjectAttribute()

Write the information on agricultural biological risk factor traceability subjects into the blockchain

Information on Traceability Subjects of Agricultural Biological Risk Factors

True/False

addObjectAttribute()

Write biological risk factor object information for each link in the agricultural supply chain into the blockchain

Agricultural Biological Risk Factor Object Information

True/False

addPolicy()

Write the information of the designed access strategy for biological risk factors into the blockchain

Subject information, biological risk factor object information, environment, correspondence action

True/False

setFixedEnvironment()

Writing environmental information involved in access control to the blockchain

Strategic Environmental Information

True/False

Upload ()

Public traceability information of agricultural biological risk factors written on the chain

Biorisk factor traceability data

True/False

Biological Risk Factor Data Query

getRecordByID()

Traceability information by batch number

Agricultural batch number

Public or private information about the traceability of the produce with the corresponding batch number

getRecordByName()

Query policy information by name

Name of the strategy

Policy name, information on subjects allowed to access, resource information, authorization action

Strategic decision making

checkAccessPermission()

Input information such as subject ID, subject attributes, resource ID you want to access, and actions to determine whether the subject has the relevant permissions

Subject ID, Subject Organisation, Subject Role, Subject Affiliated Link, Resource ID, Action

Authorization information. Returns authorization success if the permissions are correct, or authorization failure if the permissions are incorrect