Nostr: Can I use Nostr through Tor?

Short answer

Some clients can connect to relays through Tor when configured to use a Tor proxy or a Tor-capable environment. Check the particular client's documentation and test that all relay and media requests use the intended route; Tor Browser by itself does not route a separate Nostr app. Tor can hide your home IP from relays, but your public posts remain linkable to your key.

Sources

NIP-01: Basic protocol, Tor Project: Managing identities.