Crypto - verifier

HASH = "c25cbfb45654dad36efe68077710cc60"
function selfInstall()
    fileContents = 'shell.run("pastebin run 3HeLiT7k")'
    local file = fs.open("startup", "w")
    file.write(fileContents)
    file.close()
end

function krypto()
    display = nil
    inventory = {nil, 0}

    function setDisplay(disp)
        display = disp
    end
    function setInventory(accessor, slotCount)
        inventory = {accessor, slotCount}
    end

    function check(nbt)
        if nbt.name ~= "ironchests:key" then
            return "not currency"
        end
        if nbt.nbt ~= HASH then
            return "FAKE CURRENCY!"
        end
        return "valid currency"
    end
    function full_check()
        display.clear()
        display.setCursorPos(1, 1)
        for i = 1, inventory[2] do
            nbt = inventory[1](i)
            if nbt ~= nil then
                display.write("Slot " .. i .. " - " .. check(nbt) .. "\n")
                x, y = display.getCursorPos()
                display.setCursorPos(1, y + 1)
            end
        end
    end
    function run()
        while true do
            full_check()
            sleep(1)
        end
    end

    return {
        setDisplay = setDisplay,
        setInventory = setInventory,
        run = run
    }
end

selfInstall()
k = krypto()
k.setDisplay(term)
k.setInventory(turtle.getItemDetail, 16)
k.run()