A network moat tells you what a system could not reach. It tells you nothing about what the system actually decided. Containment without a signed record is a story you hope is true.
Isolating a model from the network is a containment control, not an accountability control. Air-gapping limits blast radius but proves nothing about what the model decided or why. Real containment needs a signed, hash-chained, offline-verifiable record, not just a moat.
Originally published on mickai.co.uk. This is a cross-post; the canonical version, with the full body, footnotes and references, lives on the mickai.co.uk article page.

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