# Browser Runtime

> Real-browser worker ownership, memory, privacy, cancellation, and recovery requirements.

- Site: TinyRustLM
- Canonical: https://TinyRustLM.mirust.com/browser-runtime/
- Version: 1.8.0
- Updated UTC: 2026-08-28T20:20:00Z

## Real browser proof

Chromium execution is the first required browser proof. Node or a standalone WebAssembly harness is not browser evidence. Exact browser build, module hash, composition identity, network summary, resource bounds, and profile lifecycle remain part of the receipt.

- Chromium first proof
- Bounded peak-memory model
- No whole-file copy assumptions
- Exact browser identity

## Privacy and isolation

Cross-origin isolation, CSP, service-worker behavior, and a network allowlist are release contracts. The site receives no prompts or model bytes. Unexpected telemetry, beacons, third parties, or credential-bearing URLs fail the privacy gate.

- COOP and COEP
- CSP and explicit allowlist
- No prompt upload
- No implicit telemetry