I know that, I said “any site”.
I also know that, but that signature leaves your device through your vpn.
Discussion
The private key cannot be derived from your signature. The signature is stored locally in a client or browser extension or another signer app.
Sorry but I’m not going to explain further. If you truly want to know how it works, search engines are your friend. Look up how nostr signing works and look into cryptographic signatures.
Thanks but I don’t need to go that deep to understand that when a VPN is on everything goes through it. I appreciate it though.