Pick a free source, get a QR. Anyone who scans it runs a hash-verified cell in their own browser that fetches the live value — no server, no install, no account.
The QR encodes run.html#<spec>. The runner verifies the extract cell's sha8 before executing it in a sandboxed iframe. Zero-dependency QR encoder (qr.mjs) — runs from a fork or offline. A rapp-static-api/1.0.