Design and Implementation of Ledger-Based Points Transfer System for IoT Devices in LPWAN

Algorithm 2

Optimized transaction request function

;               //The number of nodes

;                   //The ledger

;     //The candidates of received node ’s update block

;                 //Selected nodes

Data:, ,

Result:, ,

function ;

Receive requested transaction from the points transfer terminal;

if is not then

 Send to other nodes;

else

 ;

 Receive from other nodes;

end

if is not then

  of in

  of in

 Calculate candidates of new balances and based on blocks in ;

  and

 fortodo

  ifthen

   Receive as calculated candidate of new balances from other nodes;

  end

 end

 if not in then

  forto and not received do

   Forward ;

  end

 end

 Calculate as a majority vote of ;

 Send approval results to the points transfer terminal;

end