Algorithms A2. Smart Contract 2: Product Purchase1

Input: entity name, entity id, entity type, entity quantity, addr, seller, buyer

1. if addr is valid && addr has adding authentication

2. dairy_farm_details=getFarm(seller)

3. x[]=getProduct_Adulteration_Info(entity id)

4. y[]=getProduct_Contamination_Info(entity id)

5. if x.quality ==1 && y.quality==1

6. Proceed with the purchase

7. Initiate the payment to the farmer

8. z=addBilling_Info(addr, dairy_farm_details, buyer, entity id, entity quantity, entity name, entity type, price)

9. if z==1

10. Payment Successful

11. updateProduct_Quantity(entity id, entity quantity, entity name, entity type)

12. end

13. else

14. Payment Unsuccessful

15. go to step 7

16. end

17. else

18. Product not fit for purchase due to lower quality standards

19. end

20. else

21. Invalid or authorised address

22. go to step 1 and enter a valid address

23. end

24. else

25. Invalid or authorised address

26. go to step 1 and enter a valid address

27. end