I blocked Tor exit nodes, then I opened Tor Browser
I deployed a hardened Tor exit node firewall on a SaaS production box, opened Tor Browser to confirm, and the site loaded. The IPv4 fortress was perfect. The IPv6 side door was wide open. This is the script, the punchline, and the rewrite that became TorShield.
toriptablesipsetipv6linuxsecurityops