Nickserv might have a cloaking facility, depends on which package they run..
Best to use a full client rather than a webclient that way you can run commands automatically on startup like nickserv login and cloaking if available
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Just been on there, their Nickserv doesn;t have a hide facility

---------- Post added at 22:08 ---------- Previous post was at 22:06 ----------
You might find as well as they have an open policy that they also don;t allow open proxies.. Such is the way of IRC