TheBitcoinManual on Nostr: No blockchain no, but does use private public key pairs, your data is stored on ...

No blockchain no, but does use private public key pairs, your data is stored on various relays, and you can run your own relay if you want

There are other clients you can try if you're into long form content, like Habla, Highligher, blogstack or yakihonne

Here's a post I did on nostr for bloggers

https://thebitcoinmanual.com/articles/nostr-blogging/