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

Algorithm 3

Input: candidate buyers and sellers , data amounts , and prices of candidate buyers and sellers in slot

Output: data transaction result and winning buyer

//Initialization

,,

//Decide winning buyer

buyer with highest price in

//Decide trading price of winning buyer

ifthen

  Find second-highest price from as trading price of

else

  Use price of as trading price of

end

//Decide winning sellers providing data to winning buyer

whiledo

end

//Decide trading price of winning sellers

ifthen

  Trading price of sellers in Price of first seller in

else

  Trading price of sellers in Price of last seller in

end

//Record trading information of winning buyer

ifthen

end

//Record trading information of winning sellers

for eachdo

  ifthen

  exit

  else

  end

end

return