When I create an event or publish a post on Nostr, is my personal information, such as location or IP address, also sent to and stored by relays?
They possibly could. If you are worried about this, you could use tor to hide your ip. If you use a Nostr website, use tor browser to hide your ip.
Location data could be embedded in the notes you upload to Nostr through image metadata so I would be careful of that as well.
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I'm sure they know the IP address, but that doesn't mean they keep it. Some do, others don't.
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