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

Algorithm 1

Policy tree update contract.

Input: New policy tree PT, New policy tree’s address Dataplace_PT, Signature of PT Sign_PT

Output:

1: initialize: Set , ,

2: ifthen

3: 

4: ;

5: ifthen

6:  Input paymeent password Pw;

7:  while Pw is not true and time ≤3 do

8:   time++;

9:  end while

10:  if time≤3 then

11:   ;

12:  else return Account lock;

13:  end if

14: else return Insufficient balance;

15: end if

16: end if

17:

18:

19: return