Code loaded at print time executes on partner pages, so it is pinned like every embed. The bundle
carries the generator's sha384 (library/packet/poster-render.integrity.js, written by
`bun run pin:poster-render`); posterSheets fetches <assets>/lib/poster-render.js as TEXT, hashes it
with WebCrypto, and on a match imports the verified text from a blob: URL — never the network URL a
second time. A mismatch refuses to run, with a message naming the URL and both hashes; the print falls
back to what it can do without the generator.
The page base is captured when posterSheets evaluates, and every URL it resolves (the generator, the
boundaries, the places) resolves against it — not the bundle's location, and not a URL a single-page
host changed after load.
check:poster-render-pinned (gates:pre), two-sided: the pin equals the sha384 of the source and of the
served copy (a stale pin names the command — proven by an unpinned edit); a TAMPERED copy is refused
and its planted side effect never runs; the genuine copy loads and draws. check:poster-browser-equiv
still passes byte-identical through the pinned path. country-posters 1,472,734 bytes (ceiling
1,500,000), my-upg-100-list 1,232,508, both carrying the pin; verify-bundles-shipped PASS; gates:pre 74/74.
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