We are doing a social experience with #notabot / #[1]
In order to verify the other-one is human, we start by inviting the person on nostr to come in a secret group chat, the person need to download an app, so this first action is a proof of human (would be hard for a bot to do this).
We than coordinate on the chat to help everyone getting fully verified and pass on the key of the secret group chat by making everyone admin.