Differential Privacy-Based Double Auction for Data Market in Blockchain-Enhanced Internet of Things

Algorithm 2

Input: price and data quality of active buyers and sellers in slot

Output: valid price with for data trading in slot

;

Sort prices of active buyers:

Sort prices of active sellers:

ifthen

  refine active buyers

  refine active sellers

else ifthen

  refine active buyers , with

  refine active sellers , with

else ifthen

  refine active buyers , with

  refine active sellers , with

end

//Call function to decide valid price

return

  The function is as follows.

Function

Input: price and data quality of refined active buyers and sellers in slot

Output: valid price with for data trading in slot

Sort quality of refined active buyers in as ,

Sort quality of refined active sellers in as ,

ifthen

else ifthen

   with and

else ifthen

   with and

endreturn