Algorithm 1 The blockchain-based image encryption process.

Require: $BlockchainWebService$ Ensure: $genesisblock$  while T has not expired do   if node $N_i$ is authenticated == true then    if request $Ri$ matched == true then     if $Ri$ is identified as processed request == false then      process for the response to $C_i$      Hash(image)      Update chain     else      Response to $N_i$ that the $Ri$ is not valid     end if    else     Deny the Request    end if    Validate and Add block into chain   end if  end while