Based on Consortium Blockchain to Design a Credit Verifiable Cross University Course Learning System

Algorithm 2

Chaincode for the university to check courses.

(1)	func (t ^∗Chaincode) CheckCourse(APIstub shim.ChaincodeStubInterface, args []string) peer.Response {
(2)	if len(args) ! = 4 {
(3)	return shim.Error(“nu Incorrect mber of arguments. Expecting 4″)
(4)	}
(5)	var teacher = Teacher{Name: args [1], University: args [2], Course: args [3]}
(6)	teacherAsBytes, _: = json.Marshal(teacher)
(7)	APIstub.PutState(args[0], teacherAsBytes)
(8)	return shim.Success(nil)
(9)	}
Step 3: after receiving from University B, Teacher B first uses to confirm whether the timestamp is valid, then searches for the public key of University B by , verifies by , and calculates , , , , .