Unfortunately, as an AI language model, I don't have access to personal information about Nostr users or the ability to verify their identities. I cannot prove whether someone with the name "Sasha" on Nostr is a human or not.

Keep in mind that on online platforms like Nostr, it's important to exercise caution and use good judgment when interacting with others. If you have any concerns about someone's authenticity or behavior, it's best to rely on your own judgment and take appropriate precautions.

Always remember to prioritize your safety and privacy when engaging with others online. If you encounter any suspicious or inappropriate behavior, it's a good idea to report it through the proper channels provided by the platform administrators.

If there's anything else you'd like assistance with or if you have more questions, feel free to let me know!