Its basically an instruction book. The instruction book says that nostr apps should allow for posting to multiple websites at the same time (they're called nostr relays). The websites don't post to each other, you just post to multiple websites. So if a website bans you, hopefully your friends are following you on multiple websites and one of those websites hasn't banned you so your friends can still talk to you and see your posts.
Where is the data stored?
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On every website you publish to (every relay you're using)
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What do websites receive from hosting my data/posts/images etc?
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Nothing. Not a single thing.
There are a couple of websites that have you pay to use them, but most websites people use are either websites that are run by their friends, or free well known websites that the whatever nostr based program you're using knows already without you telling it about more websites.
Kind of like how most people play on the Minecraft server that's on minecraftservers.org, but you can join your friends Minecraft server if you know about it.
You know I think if you just jump into it, it'll make sense. astral.ninja for web browser and nostros for Android have been good to me.
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