Algorithm 4: Accessing patient’s prescription

Input: patientID, pharmaID, Output: Prescription of the patient pragma solidity ^0.5.12;  mapping(address => address) authorizedPharma;  if( isPharmacyAuthorized(patientID))  {   Get prescription of the patient from the database   transaction is recorded in the blockchain;  }  else   Revert the transaction;  function public isPharmacyAuthorized(address patientID) public view return (bool display)  {    if(msg.sender == authorizedPharma(patientID))     return true;    else     return false;  }