MB-BC: Drug Traceability System Based on Multibranched Blockchain Structure

Algorithm 2

Witness node election method.

Input: S(set of nodes), (number of leading nodes), (number of general nodes), (number of witness nodes)

Output:(set of witness nodes), (set of alternate nodes)

1: initialize: Set

2: for to do

3: for to do

4:  ;

5: end for

6: return

7: ;

8: ;

9: end for

10: return

11: ;

12: ;

13: ;

14: return R_1,R₂