Your Anthropic API key is sent only to Anthropic's servers — never to DarkPixel or any third party.
That doesn't look like a valid key. It should start with sk-ant-
⚠Tab only (unchecked): key wipes when this tab closes. Safest default. Remember: saved as plaintext in this browser's localStorage — anyone with access to this browser profile can read it. Don't tick on shared machines. Encrypt: passphrase-derived AES-GCM (Web Crypto). Storage is safe against disk snooping; you'll type the passphrase once per session.