Protecting Check-In Data Privacy in Blockchain Transactions with Preserving High Trajectory Pattern Utility

Algorithm 1

Check-in privacy protection algorithm based on generalization of check-in location.

Input: sensitive check-in location , privacy protection threshold k;

Output: an anonymous set of locations containing k locations.

1. LAS;

2. T= MC-LTR (,s);

3. L= GLS ();

4. S = LATP ();

5. = DLS ();

6. LAS = ;

7. if(LE<1/k)then

8. Return LAS.

9. else

10. Return .