Implements Notary Proofs

[Step7750]

Mega-PR that provides E2E functionality for computing tlsn proofs. There will be a few follow ups for submitting proofs and auto-computing them in certain circumstances.

Overview:

• New NOTARY_PROVE method for external communication
• New bridge layer for service worker <-> offscreen communication
• Decent chunk of auxiliary bootstrapping in order to load WASM (ie. mutated CSP, headers)
• Permits only one ongoing proof at a time -- likely a good idea regardless since CPU can briefly spike during proof gen

Firefox is not supported: It appears to not be possible to set Cross-Origin-Embedder-Policy and Cross-Origin-Opener-Policy headers on the FF background page itself (dynamic MV3 header rewrite rules were a no-go as well). Given the small % that FF makes up on the site, we can likely shift them to the app to complete associated tasks.

---

Note

Introduces TLSNotary proof generation with a new NOTARY_PROVE request, offscreen worker pipeline, and build/manifest updates (CSP, permissions, assets) to load WASM and enable multi-threading.

• Notary/TLSN:
  • Add NOTARY_PROVE request/handler (src/lib/bridge/handlers/notary_prove.ts) with max concurrency, using tlsn-js to produce presentation proofs.
  • New notary request types/utilities (src/lib/notary/types.ts, src/lib/notary/utils.ts) and offscreen client bridge (src/offscreen/client.ts).
• Offscreen Infrastructure:
  • Implement offscreen runtime (src/offscreen/offscreen.{html,ts}), request routing (src/offscreen/handlers/*), worker thread (src/offscreen/worker.ts), and lifecycle utils (src/offscreen/utils.ts).
  • Initialize TLSN worker threads and compute request/response byte sizes for proving.
• Bridge Wiring:
  • Register RequestType.NOTARY_PROVE in handlers.ts and enums; add MaxConcurrency wrapper in cached.ts.
• Build/Manifest:
  • manifest.json: add minimum_chrome_version, permission offscreen, and CSP for extension pages (allow WASM eval).
  • webpack.config.js: add offscreen entry, copy TLSN assets/snippets, provide Buffer, set COOP/COEP headers for dev; filter offscreen permission for Firefox; add local hosts in dev.
  • tsconfig.json: update module to es2022.
• Config/Utils:
  • Add notary endpoints and logging levels to environment*.ts.
  • Add wait(ms) util.
• Dependencies:
  • Add tlsn-js, comlink, and buffer (and associated WASM/snippets) to project.

^{Written by Cursor Bugbot for commit 75e45c9. This will update automatically on new commits. Configure here.}

[GODrums]

A few optional minor improvements. Overall, super impressive technology though.

[cursor]

Bug: Document Creation Promise Not Reset

The creating variable isn't reset if offscreen document creation fails. This leaves it as a rejected promise, preventing all future attempts to open the document.