I'm not sure about the formal definition but I'd consider keyword mute/block lists to be a part of that.

I think there's some discussion on it using proposed NIP-69 by Rabble (it's shares the NIP number with polls because polls is not yet merged into the protocol) & NIP-36 for marking content as sensitive is already live in a few clients.

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Thanks for the inputs. I will research in the direction you indicated.

BTW - is your LN address empty? I can't seem to be able to zap you

Nope 😬

Trying to experience Nostr zap-free