Detecting Proxy Update via EntityProxyChange event

I am trying to add a handler to detect the proxy changes. The
event.getWriteOperation() does detect the UPDATE operation but it is
more generalized than what I actually need. The doc reads: "An UPDATE
event is fired whenever a client encounters a proxy for the first
time, or encounters a proxy whose version number has changed." How do
I only detect the proxy whose version number has changed?!!!

Thanks,

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