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+public class Verifier%0A%7B%0A    public static final long EXAMPLE_CARD_PUBLIC_KEY = 5764801;%0A    public static final long EXAMPLE_DOOR_PUBLIC_KEY = 17807724;%0A    %0A    public Verifier (boolean debug)%0A    %7B%0A        _debug = debug;%0A    %7D%0A%0A    private boolean _debug;%0A%7D

Create Verifier.java