2bec46fa5d
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- Blocklist attribution: the cited AugurProject/eth-phishing-detect repository no longer exists (GitHub returns 404), and the vendored list and the runtime refresh both come from the live upstream that BLOCKLIST_URL points at. The dead link is dropped, the project, copyright and license are kept, and a note records why no repository link is given. - Token display: balances.js shows any ERC-20 with a nonzero balance that is in the bundled top-250 list, tracked, or has 1,000+ holders, so tokens do appear without the user adding them. The Data Model section now states that rule, including that it is unconditional while the 1,000-holder setting applies only to transaction history and the send selector. The manual-only claims elsewhere are corrected to match. - Navigation: replaced the flat/no-tabs paragraph with the stack model the Screen Map documents, naming the AddWallet import tabs and the AddressDetail overflow menu.
1223 lines
62 KiB
Markdown
1223 lines
62 KiB
Markdown
# AutistMask
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AutistMask is a GPL-licensed JavaScript browser extension by
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[@sneak](https://sneak.berlin) that provides a minimal Ethereum wallet for
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Chrome and Firefox. It manages HD wallets derived from BIP-39 seed phrases and
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supports sending and receiving ETH and ERC-20 tokens, as well as web3 site
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connection and authentication via the EIP-1193 provider API.
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The most popular browser-based EVM wallet has a cute mascot, but sucks now. It
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has tracking, ads, preferred placement for swaps, tx broadcast fuckery,
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intercepts tx status links to their own site instead of going to Etherscan, etc.
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None of the common alternatives work on Firefox.
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Hence, a minimally viable ERC20 browser wallet/signer that works cross-platform.
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Everything you need, nothing you don't. We import as few libraries as possible,
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don't implement any crypto, and don't send user-specific data anywhere but a
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(user-configurable) Ethereum RPC endpoint (which defaults to a public node). The
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extension contacts three user-configurable services: the configured RPC node for
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blockchain interactions, a public CoinDesk API (no API key) for realtime price
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information, and a Blockscout block-explorer API for transaction history and
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token balances. It also fetches a community-maintained phishing domain blocklist
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periodically and performs best-effort Etherscan address label lookups during
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transaction confirmation.
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In the extension is a hardcoded list of the top ERC20 contract addresses. You
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can add any ERC20 contract by contract address if you wish, but the hardcoded
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list exists to detect symbol spoofing attacks and improve UX.
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## Getting Started
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```bash
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git clone https://git.eeqj.de/sneak/autistmask.git
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cd autistmask
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make install
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make build
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```
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Load the extension:
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- **Chrome**: Navigate to `chrome://extensions/`, enable "Developer mode", click
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"Load unpacked", and select the `dist/chrome/` directory.
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- **Firefox**: Navigate to `about:debugging#/runtime/this-firefox`, click "Load
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Temporary Add-on", and select `dist/firefox/manifest.json`.
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### Debug Builds
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`make build` always produces a release build: the build-time `DEBUG` constant is
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`false`, so wallet creation uses real entropy and the red banner is off. To
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produce a debug build instead, set `AUTISTMASK_DEBUG=1` in the environment:
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```bash
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make build-debug # or: AUTISTMASK_DEBUG=1 make build
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```
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Only the exact value `1` enables it; any other value (including unset, empty, or
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`true`) yields a release build, so a typo cannot accidentally ship the debug
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behavior. The build prints which mode it used. See the
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[DEBUG Mode Policy](#debug-mode-policy) for what the flag changes. **Never
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distribute a debug build** — every wallet it creates gets the same publicly
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known test recovery phrase.
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Both builds end by running `script/verify-build`, which reads the compiled
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`DEBUG` state back out of the emitted bundles and fails the build if it is not
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the one that was asked for. The test suite cannot check this: it loads
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`src/shared/constants.js` outside a bundle, so it only ever sees the fallback
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value. The assertion is on the artifacts because that is where the property
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lives.
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## Entrypoints
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This repository adheres to the
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[Scripts to Rule Them All](https://github.com/github/scripts-to-rule-them-all)
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standard: normalized scripts in `script/` are the entrypoints for the
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development workflow, and the Makefile targets are thin shims that call them. We
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provide:
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- `script/bootstrap` — install all dependencies (pinned node via nvm if needed,
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yarn via corepack, `yarn install --frozen-lockfile`)
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- `script/setup` — make a fresh clone ready for development: bootstrap plus the
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git pre-commit hook
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- `script/projectname` — print the project name (used for the Docker image tag)
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- `script/test` — run the test suite (jest)
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- `script/test-e2e` — run the browser end-to-end suite (docker required; see
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[End-to-End Tests](#end-to-end-tests))
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- `script/lint` — run the linter
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- `script/fmt` — format all files (writes)
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- `script/fmt-check` — check formatting (read-only)
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- `script/check` — run test, lint, and fmt-check
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- `script/verify-build` — assert the compiled `DEBUG` state of the bundles in
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`dist/`: every bundle containing `src/shared/constants.js` must have `DEBUG`
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off, or on when `AUTISTMASK_DEBUG=1`. Run automatically at the end of
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`make build` and `make build-debug`; fails loudly rather than passing if it
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cannot determine a bundle's state. Not part of `make check`, which does not
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depend on build artifacts existing.
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- `script/docker` — build the Docker image tagged via `script/projectname`
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- `script/cibuild` — CI entrypoint: plain `docker build .`
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- `script/precommit` — run by the git pre-commit hook; runs `script/check`
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- `script/install-precommit` — install the git pre-commit hook
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## End-to-End Tests
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`make test-e2e` builds `dist/chrome/` and drives the **real popup in a real
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Chrome**, loaded as an unpacked MV3 extension inside a pinned
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`mcr.microsoft.com/playwright` container (pinned by digest in `script/test-e2e`;
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docker is required and the suite fails loudly rather than skipping if it is
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unavailable). The suite lives in `tests/e2e/` and is driven by
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`playwright-core`, whose version must stay matched to the container's Playwright
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version — the browsers ship inside the image.
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It covers popup load, wallet creation through the UI, the Add Token screen and
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the transaction detail screen for an ERC-20 transfer. All outbound network is
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intercepted at the browser level and served from fixtures in
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`tests/e2e/network.js`, so the run is deterministic and fully offline;
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unrecognised outbound requests are reported as failures rather than silently
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allowed.
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That reporting has one bound worth knowing. Observation ends when the browser
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context is torn down, and nothing can watch traffic after that, so the run keeps
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collecting for a fixed grace period after the last test returns
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(`TRAILING_WATCH_MS` in `tests/e2e/run.js`, currently 1500ms) and then closes
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the context. A request whose _first_ dispatch falls after that window is never
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seen at all and cannot fail the run. In practice a request a test fires without
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awaiting reaches the route handler about 10ms later, and anything on a repeating
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timer gets observed on an earlier tick during the ~20s suite — but a one-shot
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call deliberately deferred past the window will escape.
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That interception covers the MV3 background service worker as well as the popup
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page, which it does not by default — `script/test-e2e` sets
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`PW_EXPERIMENTAL_SERVICE_WORKER_NETWORK_EVENTS=1` for it. Because that flag is
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experimental, the harness does not take it on trust. At launch it waits for the
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background worker's **own** startup request — the phishing blocklist fetch that
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`src/background/index.js` issues unconditionally — to arrive in the route
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handler, and aborts the entire suite if none does within 30 seconds
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(`tests/e2e/harness.js`). The check is passive on purpose: a synthetic probe
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fetched from inside the worker via `worker.evaluate()` was tried first and
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rejected, because evaluating in an extension service worker that early kills the
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worker outright, destroying the thing being measured. Observing traffic the
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extension already generates perturbs nothing. Losing the race fails closed — the
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suite refuses to run rather than passing quietly.
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As defence in depth, Chrome is also started with
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`--host-resolver-rules=MAP * ~NOTFOUND`, so a request that ever did slip past
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the route handler could not resolve a host at all. That only bounds the damage;
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detecting escaping traffic remains the canary's job. To see what is actually
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being intercepted, run with `E2E_TRACE_NETWORK=1` and every routed request is
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printed, tagged `[sw]` or `[page]`.
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**Any uncaught page error or `console.error` fails the run.** That is the point:
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a `ReferenceError` from a used-but-not-imported identifier is invisible to
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`make check` (`script/lint` is only `prettier --check`) but fatal in a browser,
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and this suite exists because exactly that class of bug shipped twice.
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`make test-e2e` is deliberately **not** part of `make check` or `make test`.
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`REPO_POLICIES.md` caps `make test` at 20 seconds and a browser suite does not
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fit; nothing in `tests/e2e/` is named `*.test.js`, so jest cannot pick it up
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either. It is also not wired into the Gitea workflow yet — docker-in-docker in
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CI is a separate question. Run it locally before changing anything under
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`src/popup/views/`.
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## Rationale
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Common popular EVM wallets have become bloated with swap UIs, portfolio
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dashboards, analytics, tracking, and advertisements. It is no longer a simple
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wallet. Most alternatives only support Chromium browsers, leaving Firefox users
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without a usable option.
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AutistMask exists to provide the absolute minimum viable Ethereum wallet
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experience: manage seed phrases, derive HD addresses, send and receive ETH and
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ERC-20 tokens, and connect to web3 sites. Nothing else. No swaps (that's what
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the web is for), no analytics, no tracking, no ads, no portfolio views, no NFT
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galleries. Just a wallet.
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## Design
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AutistMask is a browser extension targeting both Chrome (Manifest V3) and
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Firefox (Manifest V2/V3 as supported). The codebase is shared between both
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targets with platform-specific manifest files and a build step that produces
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separate output directories.
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### Architecture
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```
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src/
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background/ — service worker / background script
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index.js — RPC routing, approval flows, message signing
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content/ — content script injected into web pages
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index.js — relay between inpage provider and background
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inpage.js — the window.ethereum provider object (EIP-1193)
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popup/ — popup UI (the main wallet interface)
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index.html
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index.js — entry point, view routing, state restore
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styles/main.css — Tailwind source
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views/ — one JS module per screen (home, send, approval, etc.)
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shared/ — modules used by both popup and background
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balances.js — ETH + ERC-20 balance fetching via RPC + Blockscout
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constants.js — chain IDs, default RPC endpoint, ERC-20 ABI
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ens.js — ENS forward/reverse resolution
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prices.js — ETH/USD and token/USD via CoinDesk API
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scamlist.js — known fraud contract addresses
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state.js — persisted state (extension storage)
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tokenList.js — top ERC-20 tokens by market cap (hardcoded)
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transactions.js — tx history fetching + anti-poisoning filters
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uniswap.js — Uniswap Universal Router calldata decoder
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vault.js — password-based encryption via libsodium
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wallet.js — mnemonic generation, HD derivation, signing
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manifest/
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chrome.json — Manifest V3 for Chrome
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firefox.json — Manifest V2 for Firefox
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```
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### UI Design Philosophy
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The UI is inspired by _Universal Paperclips_. It's deliberately minimal,
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monochrome, fast, and includes once-popular usability affordances that seem to
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have fallen out of fashion in modern UI design. Clickable things look clickable.
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Things don't flash or spin or move around unnecessarily. This is a tool for
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getting work done, not a toy.
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This is designed for a normal audience. Basic familiarity with cryptocurrency
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terms is required, but you need not be a programmer or software engineer to use
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this wallet.
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If you _are_ basically familiar with cryptocurrency terms, you should be able to
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use all of the main features of this wallet without having to read the
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documentation; i.e. we wish for the primary functionality to remain easily
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discoverable.
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#### Visual Style
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- **Monochrome**: Black text on white background. Color is only used when and
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where it is semantically meaningful and explicitly useful, such as error
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messages, critical warnings, or address disambiguation. (Notable exception: we
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use color dots, and identicons, to help a user easily distinguish addresses.)
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- **Text-first**: Every piece of information is presented as text. Balances are
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numbers. Addresses are hex strings. Flash messages are sentences. All fiddly
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bits can be clicked to copy to the clipboard, and external links to Etherscan
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are provided everywhere they might be useful.
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- **Monospace font**: All text is rendered in the system monospace font.
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Ethereum addresses, transaction hashes, and balances are inherently
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fixed-width data. Rather than mixing proportional and monospace fonts, we use
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monospace everywhere for visual consistency and alignment.
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- **No images**: Zero image assets in the entire extension. No logos, no
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illustrations, no token icons. Token identity is conveyed by symbol text (ETH,
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USDC, etc.). We display
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[Blockie identicons](https://github.com/MyCryptoHQ/ethereum-blockies-base64)
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on critical screens and when space is available to allow users to disambiguate
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addresses visually, as a security feature.
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- **Tailwind CSS**: Utility-first CSS via Tailwind. No custom CSS classes for
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styling. Tailwind is configured with a minimal monochrome palette. This keeps
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the styling co-located with the markup and eliminates CSS file management.
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- **Vanilla JS**: No framework (React, Vue, Svelte, etc.). The popup UI is small
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enough that vanilla JS with simple view switching is sufficient. A framework
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would add bundle size, build complexity, and attack surface for no benefit at
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this scale.
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- **360x600 popup**: Standard browser extension popup dimensions. The UI is
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designed for this fixed viewport.
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#### No Layout Shift
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Asynchronous state changes (clipboard confirmation, transaction status, error
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messages, flash notifications, API results returning) must _never_ move around
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the existing UI elements. All dynamic content areas must reserve their space up
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front using `min-height` or always-present wrapper elements.
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`visibility: hidden` is preferred over `display: none` when the element's space
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must be preserved. This prevents jarring content jumps that disorient users and
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can cause dangerous mis-clicks. Anyone who has multi-tabled on ClubGG and
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smashed the big red "all-in blind preflop" button when trying to simply "call"
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on a different table knows exactly tf I am talking about.
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#### Clickable Affordance
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Every interactive element must visually indicate that it is clickable. Buttons
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use a visible border, padding, and a hover state (invert to white-on-black).
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Text that triggers an action (e.g. "Add additional wallet...") uses an
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underline. No invisible hit targets, no bare text that happens to have a click
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handler. If it does something when you click it, it must look like it does
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something when you click it.
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#### Display Consistency
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The same data must be formatted identically everywhere it appears. Token and ETH
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amounts are displayed with exactly 4 decimal places (e.g. "1.0500 ETH", "17.1900
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USDT") in balance lists, transaction lists, send confirmations, and approval
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screens. Timestamps include both an ISO datetime and a humanized relative age
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wherever shown. If a formatting rule applies in one place, it applies in every
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place. Users should never see the same value rendered differently on two
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screens.
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**Specific Exception — Truncation:** On some non-critical display locations, we
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may truncate _a small number_ of characters from the middle of an address solely
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due to display size constraints. Wherever possible, and, notably, **in all
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critical contexts (transaction confirmation view before signing, transaction
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history detail view) addresses will _NEVER_ be truncated**. Even in places we
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truncate addresses, we truncate only a maximum of 10 characters, which means
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that the portions still displayed will be more than adequate for the user to
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verify addresses even in the case of address spoofing attacks. Clicking an
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address will always copy the full, untruncated value.
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**Specific Exception — Transaction Detail view:** The transaction detail screen
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is the authoritative record of a specific transaction and shows the exact,
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untruncated amount with all meaningful decimal places (e.g. "0.00498824598498216
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ETH"). It also shows the native quantity (e.g. "4988245984982160 wei") below it.
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Both are click-copyable. Truncating to 4 decimals in summary views is acceptable
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for scannability, but the detail view must never discard precision — it is the
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one place the user can always use to verify exact details.
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#### Language & Labeling
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All user-facing text avoids unnecessary jargon wherever possible:
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- "Recovery phrase" instead of "seed phrase", "mnemonic", or "BIP-39 mnemonic"
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- "Address" instead of "account", "derived key", or "HD child"
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- "Password" instead of "encryption key" or "vault passphrase"
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- Buttons use plain verbs: "Send", "Receive", "Copy address", "Add", "Back",
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"Cancel", "Lock", "Unlock", "Allow", "Deny"
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- Helpful inline descriptions where needed (e.g. "This password locks the wallet
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on this device. It is not the same as your recovery phrase.")
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- Error messages are full sentences ("Please enter your password." not "password
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required")
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#### Full Identifiers Policy
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Addresses, transaction hashes, contract addresses, and all other cryptographic
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identifiers are displayed in full whenever possible. We truncate only in
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specific, limited, non-critical places and even then only a small amount that
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still prevents spoofing attacks. Address poisoning attacks exploit truncated
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displays by generating fraud addresses that share the same prefix and suffix as
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a legitimate address. If a user only sees `0xAbCd...1234`, an attacker can
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create an address with the same visible characters and trick the user into
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sending funds to it. Showing the complete identifier defeats this class of
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attack.
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#### Data Model
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The core hierarchy is **Wallets → Addresses**:
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- A **wallet** is one of three types:
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- An **HD wallet** (`type: "hd"`, recovery phrase): generates multiple
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addresses from a single 12/24 word recovery phrase using BIP-39/BIP-44
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derivation. The user can add more addresses with a "+" button.
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- A **key wallet** (`type: "key"`, private key): a single address imported
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directly from a private key. No "+" button since there is only one
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address.
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- An **xprv wallet** (`type: "xprv"`, extended private key): the same
|
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multi-address behavior as an HD wallet, including the "+" button and the
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address scan on import, but imported from an extended private key rather
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than a recovery phrase. It therefore has no recovery phrase to display or
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back up.
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- An **address** holds ETH and ERC-20 tokens.
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- The user can have multiple wallets, each with multiple addresses (HD) or a
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single address (key).
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Which tokens an address shows is decided by `fetchTokenBalances()` in
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`src/shared/balances.js`, from the Blockscout `token-balances` response, so
|
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tokens do appear without the user adding them. An ERC-20 is shown when its
|
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balance is nonzero and it is in the bundled top-250 token list, is tracked by
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the user, or has 1,000 or more holders; a token claiming a symbol from the
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bundled list from any other contract address is always dropped. That filter is
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unconditional — the "Hide tokens with fewer than 1,000 holders" setting governs
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the transaction history and the send-screen token selector, not this list.
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Tracked tokens with a zero balance are listed as well while "Show tracked tokens
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with zero balance" is on.
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#### Navigation
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The main view shows all addresses grouped by wallet, with ETH balances inline.
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The user taps an address to see its detail view (full address, balance, tokens,
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send/receive). Navigation is a stack: each forward action pushes the current
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|
screen, and every view has a "Back" or "Cancel" button that pops back to it (see
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the Screen Map below). There is no hamburger menu and no persistent tab bar; the
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|
Settings gear in the title bar is the only global control. Two screens carry an
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|
in-screen control beyond that: AddWallet uses three tabs to select the import
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mode, and AddressDetail keeps its one rarely-used action ("Export Private Key")
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behind a "···" menu.
|
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|
|
### Screen Map
|
|
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Navigation uses a stack model (like iOS): each forward action pushes the current
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screen onto `state.viewStack`, and "Back" pops it (`pushCurrentView()` and
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`goBack()` in `src/popup/views/helpers.js`). The root screen is either Welcome
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(no wallets) or Home (has wallets). Each screen below gives its view id in
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parentheses; the registry of view ids is the `VIEWS` array in
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`src/popup/views/helpers.js`, and the markup for a screen is the element with id
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`view-` plus that view id in `src/popup/index.html`.
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Three elements sit outside the screens and are present on all of them: the title
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bar ("AutistMask by @sneak" plus the Settings gear), the flash message line
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under it, and the red banner at the very top that appears on a debug build, when
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runtime debug mode is on, or when the active network is a testnet. They are not
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repeated in the element lists below.
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Closing and reopening the popup returns to the screen the user was last on only
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for the views listed in `RESTORABLE_VIEWS` (`src/popup/index.js`). Every other
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screen, including ExportPrivKey, falls back to Home.
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#### Welcome (`welcome`)
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|
|
- **When**: No wallets exist yet (`state.hasWallet` is false). This is the root
|
|
screen in that case.
|
|
- **Elements**:
|
|
- "Welcome! To get started, add a wallet." text
|
|
- "Add wallet" button
|
|
- **Transitions**:
|
|
- "Add wallet" → **AddWallet**
|
|
|
|
#### Home (`main`)
|
|
|
|
- **When**: At least one wallet exists. This is the root screen.
|
|
- **Elements**:
|
|
- Active address ETH balance (large) + USD value in parentheses
|
|
- "Total:" USD value across ETH and every token shown for the active address
|
|
- Active address (color dot, full address, etherscan link, tap to copy)
|
|
- Send / Receive quick-action buttons, both acting on the active address
|
|
- ETH/USD price display
|
|
- Wallet list: each wallet shows its name (tap to rename inline) and a "+"
|
|
button for HD and xprv wallets, then one block per address with "Address
|
|
N" (bold when active), the ENS name if resolved, the full address, an
|
|
`[info]` button, the address USD total, and a balance line for ETH and for
|
|
each token shown for that address
|
|
- "Recent Transactions": up to 25 transactions merged across every address
|
|
of every wallet, deduplicated by hash and filtered
|
|
- "Add additional wallet..." link at bottom
|
|
- **Transitions**:
|
|
- Tap address row → sets the active address and broadcasts
|
|
`AUTISTMASK_ACTIVE_CHANGED` (no screen change)
|
|
- Tap wallet name → inline rename field (no screen change)
|
|
- "+" on wallet → derives the next address inline (no screen change)
|
|
- `[info]` on address → **AddressDetail**
|
|
- "Send" → **Send** (refuses with a flash message on a zero balance)
|
|
- "Receive" → **Receive** (shows active address QR)
|
|
- Tap home tx row → **TransactionDetail**
|
|
- "Add additional wallet..." → **AddWallet**
|
|
- Settings gear → **Settings** (toggles; tap again to return)
|
|
|
|
#### AddWallet (`add-wallet`)
|
|
|
|
- **When**: User wants to add a new wallet (from Welcome, Home, or Settings).
|
|
This one screen covers all three import modes; there is no separate import
|
|
screen.
|
|
- **Elements**:
|
|
- "Back" button, "Add Wallet" heading
|
|
- Three tabs — "From Phrase" (`tab-mnemonic`), "From Key" (`tab-privkey`),
|
|
"From xprv" (`tab-xprv`) — each showing its own form section:
|
|
- **From Phrase**: instruction text, a die button that generates a
|
|
random recovery phrase, a recovery phrase textarea, and a backup
|
|
warning box that becomes visible once the die button has been used
|
|
- **From Key**: instruction text and a masked private key input
|
|
- **From xprv**: instruction text and a masked extended private key
|
|
input
|
|
- Password + confirm password inputs, with a hint line whose wording depends
|
|
on the selected tab
|
|
- "Import" button
|
|
- **Transitions**:
|
|
- "Import" with a valid entry and a matching password of at least 12
|
|
characters → creates the wallet, clears the navigation stack, and →
|
|
**Home**. The phrase and xprv modes then scan for further used addresses
|
|
and report the count as a flash message.
|
|
- "Import" with an invalid entry, a duplicate wallet or address, or a short
|
|
or mismatched password → flash message, no screen change
|
|
- "Back" → previous screen (Welcome, Home, or Settings)
|
|
|
|
#### AddressDetail (`address`)
|
|
|
|
- **When**: User tapped `[info]` on an address from Home.
|
|
- **Elements**:
|
|
- "Back" button
|
|
- Blockie identicon (48px, centered)
|
|
- Title: "Wallet Name — Address N"
|
|
- ENS name (if resolved, bold above the address)
|
|
- Full address (color dot, etherscan link, tap to copy)
|
|
- USD total for address
|
|
- Balance list: ETH + the ERC-20 tokens shown for this address (4 decimal
|
|
places, USD inline). Each balance row is clickable → **AddressToken**
|
|
- Send / Receive / + Token buttons and a "···" menu button
|
|
- "···" dropdown containing a single "Export Private Key" entry
|
|
- Transaction list (with ENS resolution for counterparties)
|
|
- **Transitions**:
|
|
- Tap balance row → **AddressToken** (for that token)
|
|
- "Send" → **Send** (refuses with a flash message on a zero balance)
|
|
- "Receive" → **Receive**
|
|
- "+ Token" → **AddToken**
|
|
- "···" → "Export Private Key" → **ExportPrivKey**
|
|
- Tap transaction row → **TransactionDetail**
|
|
- "Back" → previous screen (Home)
|
|
|
|
#### ExportPrivKey (`export-privkey`)
|
|
|
|
- **When**: User chose "Export Private Key" from the "···" menu on
|
|
AddressDetail. This screen discloses secret material.
|
|
- **Elements**:
|
|
- "Back" button
|
|
- Blockie identicon (48px, centered)
|
|
- "Export Private Key" heading
|
|
- "Wallet Name — Address N" and the full address (etherscan link, tap to
|
|
copy)
|
|
- Warning that anyone holding the private key can transfer all funds from
|
|
the address
|
|
- Error line
|
|
- Password input and "Reveal" button, shown until the key is revealed
|
|
- The private key on a highlighted background, tap to copy, shown only after
|
|
the password has been accepted
|
|
- **Transitions**:
|
|
- "Reveal" (correct password) → decrypts the wallet secret, derives this
|
|
address's key, hides the password input and shows the key (no screen
|
|
change)
|
|
- "Reveal" (wrong password) → "Wrong password." on the error line, nothing
|
|
revealed
|
|
- "Back" → clears the key and password from the DOM, then → previous screen
|
|
(AddressDetail)
|
|
|
|
#### AddressToken (`address-token`)
|
|
|
|
- **When**: User clicked a specific token balance on AddressDetail.
|
|
- **Elements**:
|
|
- "Back" button
|
|
- Blockie identicon (48px, centered)
|
|
- Title: "Wallet Name — Address N — TOKEN"
|
|
- Full address (color dot, etherscan link, tap to copy)
|
|
- USD total for this token
|
|
- Single token balance line (4 decimal places)
|
|
- Send / Receive buttons
|
|
- Token contract well (ERC-20 only): full contract address (tap to copy,
|
|
etherscan link) plus name, symbol, decimals, holder count and project
|
|
website where known
|
|
- Token-filtered transaction list (only this token's transfers)
|
|
- **Transitions**:
|
|
- "Send" → **Send** (token locked: the dropdown is replaced by a static
|
|
symbol and contract address)
|
|
- "Receive" → **Receive** (ERC-20 warning shown for non-ETH tokens)
|
|
- Tap transaction row → **TransactionDetail**
|
|
- "Back" → previous screen (AddressDetail)
|
|
|
|
#### Send (`send`)
|
|
|
|
- **When**: User wants to send ETH or a token, from Home, AddressDetail, or
|
|
AddressToken.
|
|
- **Elements**:
|
|
- "Back" button, "Send" heading
|
|
- From: address with color dot + etherscan link
|
|
- What to send: token dropdown (or static display with contract address when
|
|
locked from AddressToken)
|
|
- To: address or ENS name input, with an inline validation message
|
|
- Amount input with current balance display
|
|
- "Review" button, disabled until the recipient validates
|
|
- **Transitions**:
|
|
- "Review" (valid inputs, ENS resolved) → **ConfirmTx**
|
|
- "Review" with an unresolvable ENS name or an invalid amount → flash
|
|
message, no screen change
|
|
- "Back" → previous screen (Home, AddressDetail, or AddressToken)
|
|
|
|
#### ConfirmTx (`confirm-tx`)
|
|
|
|
- **When**: User reviewed send details and is ready to authorize.
|
|
- **Elements**:
|
|
- "Back" button, "Confirm Transaction" heading
|
|
- Type: "Native ETH transfer" or "ERC-20 token transfer (SYMBOL)"
|
|
- Token contract: full address + etherscan link (ERC-20 only)
|
|
- From: blockie + color dot + full address + etherscan link + wallet title
|
|
- To: blockie + color dot + full address + etherscan link + ENS name
|
|
- Amount: value + symbol (USD in parentheses)
|
|
- Your balance: value + symbol (USD in parentheses)
|
|
- Estimated network fee: "Estimating..." then the ETH amount (USD in
|
|
parentheses) or "Unable to estimate", fetched async
|
|
- Warnings: inline warnings from the local checks (scam address, self-send)
|
|
plus four reserved warning boxes made visible by the async checks —
|
|
recipient with no transaction history, recipient is a contract, burn
|
|
address, and an Etherscan phishing/scam label
|
|
- Errors (insufficient balance)
|
|
- Password: an inline field on this screen, not a modal, with its own error
|
|
line
|
|
- "Sign & Send" button (disabled if errors)
|
|
- **Transitions**:
|
|
- "Sign & Send" (correct password) → broadcast tx → **WaitTx**
|
|
- "Sign & Send" (correct password) → broadcast fails → **ErrorTx**
|
|
- "Sign & Send" (wrong password) → "Wrong password." on the password error
|
|
line, no screen change
|
|
- "Back" → **Send**
|
|
|
|
#### WaitTx (`wait-tx`)
|
|
|
|
- **When**: Transaction has been broadcast, waiting for on-chain confirmation.
|
|
- **Elements**:
|
|
- "Transaction Broadcast" heading (no back button — tx is irreversible)
|
|
- Amount + symbol
|
|
- To: color dot + full address + etherscan link
|
|
- Transaction hash: full hash (tap to copy) + etherscan link
|
|
- Count-up timer: "Waiting for confirmation... Ns"
|
|
- **Behavior**: Polls `getTransactionReceipt` every 10 seconds.
|
|
- **Transitions**:
|
|
- Receipt found → **SuccessTx**
|
|
- 60 seconds without confirmation → **ErrorTx** (timeout message)
|
|
|
|
#### SuccessTx (`success-tx`)
|
|
|
|
- **When**: Transaction confirmed on-chain.
|
|
- **Elements**:
|
|
- "Transaction Confirmed" heading
|
|
- Decoded action well (shown when the transaction carried recognized
|
|
calldata; the top-level Amount and To are hidden in that case)
|
|
- Amount + symbol
|
|
- To: color dot + full address + etherscan link
|
|
- Block number
|
|
- Transaction hash: full hash (tap to copy) + etherscan link
|
|
- "Done" button
|
|
- **Transitions**:
|
|
- "Done" in the approval popup → closes the popup window
|
|
- "Done" otherwise → resets the navigation stack, then → **AddressToken**
|
|
(if `selectedToken` set) or **AddressDetail**
|
|
|
|
#### ErrorTx (`error-tx`)
|
|
|
|
- **When**: Transaction broadcast failed, or timed out waiting for confirmation.
|
|
- **Elements**:
|
|
- "Transaction Failed" heading
|
|
- Amount + symbol
|
|
- To: color dot + full address + etherscan link
|
|
- Error message (dashed border box)
|
|
- Transaction hash section (hidden if broadcast failed before getting hash):
|
|
full hash (tap to copy) + etherscan link
|
|
- "Done" button
|
|
- **Transitions**:
|
|
- "Done" in the approval popup → closes the popup window
|
|
- "Done" otherwise → resets the navigation stack, then → **AddressToken**
|
|
(if `selectedToken` set) or **AddressDetail**
|
|
|
|
#### Receive (`receive`)
|
|
|
|
- **When**: User wants to receive funds at this address, from Home,
|
|
AddressDetail, or AddressToken.
|
|
- **Elements**:
|
|
- "Back" button, "Receive" heading
|
|
- Instruction text
|
|
- QR code encoding the address
|
|
- Full address (color dot, selectable, etherscan link)
|
|
- "Copy address" button
|
|
- ERC-20 warning (shown when navigating from AddressToken for non-ETH token)
|
|
- **Transitions**:
|
|
- "Back" → previous screen (Home, AddressDetail, or AddressToken)
|
|
|
|
#### TransactionDetail (`transaction`)
|
|
|
|
- **When**: User tapped a transaction row on Home, AddressDetail, or
|
|
AddressToken.
|
|
- **Elements** (grouped into logical blocks using light well containers; field
|
|
labels are self-explanatory so groups have no headings):
|
|
- "Transaction" heading, "Back" button
|
|
- Transaction hash: full hash (tap to copy) + etherscan link
|
|
- Type: transaction classification — one of: Native ETH Transfer, ERC-20
|
|
Token Transfer, Swap, Token Approval, Contract Call, Contract Creation
|
|
- Status: "Success" or "Failed"
|
|
- From: blockie + color dot + full address (tap to copy) + etherscan link;
|
|
ENS name if available
|
|
- To: blockie + color dot + full address (tap to copy) + etherscan link; ENS
|
|
name if available
|
|
- Time: ISO datetime + relative age in parentheses
|
|
- Block: block number (tap to copy) + etherscan block link
|
|
- Amount: value + symbol (bold)
|
|
- Native quantity: raw integer + unit (shown when available)
|
|
- Token contract: shown for ERC-20 transfers — color dot + full contract
|
|
address (tap to copy) + etherscan token link
|
|
- Decoded details (shown for contract calls): action name, decoded
|
|
parameters, token details, swap steps
|
|
- Network details (shown when on-chain data is available): nonce, gas price,
|
|
gas used, transaction fee (all tap to copy)
|
|
- Raw data (shown when calldata is present): full calldata in monospace
|
|
dashed border
|
|
- **Transitions**:
|
|
- "Back" → previous screen (Home, AddressDetail, or AddressToken)
|
|
|
|
#### AddToken (`add-token`)
|
|
|
|
- **When**: User wants to track an ERC-20 token, reached from "+ Token" on
|
|
AddressDetail.
|
|
- **Elements**:
|
|
- "Back" button, "Add Token" heading
|
|
- Instruction text (find contract address on Etherscan)
|
|
- Contract address input
|
|
- Status line ("Looking up token...", cleared or replaced on failure)
|
|
- Common token quick-pick buttons (top 25 by market cap), which fill the
|
|
contract address input
|
|
- "Add" button
|
|
- **Transitions**:
|
|
- "Add" (valid contract) → tracks the token, pops the stack, and re-renders
|
|
**AddressDetail**
|
|
- "Add" with a token already tracked, a scam-listed address, or a failed
|
|
contract lookup → flash message, no screen change
|
|
- "Back" → previous screen (AddressDetail)
|
|
|
|
#### Settings (`settings`)
|
|
|
|
- **When**: User tapped the Settings gear.
|
|
- **Elements**:
|
|
- "Back" button, "Settings" heading
|
|
- Wallets: one row per wallet with its name (tap to rename inline) and an
|
|
`[x]` delete button, plus a "+ Add wallet" button
|
|
- Tracked Tokens: one row per tracked token with an `[x]` remove button,
|
|
plus a "+ Add token" button
|
|
- Display: "Show tracked tokens with zero balance" checkbox and a Theme
|
|
selector (System / Light / Dark)
|
|
- Network: network selector (Ethereum Mainnet / Sepolia Testnet); switching
|
|
resets the RPC and Blockscout endpoints to that network's defaults
|
|
- Ethereum RPC: endpoint URL input + "Save" button (validated against
|
|
`eth_chainId` before being saved)
|
|
- Blockscout API: endpoint URL input + "Save" button (validated against
|
|
`/stats` before being saved)
|
|
- Token Spam Protection:
|
|
- "Hide tokens with fewer than 1,000 holders" checkbox
|
|
- "Hide transactions from detected fraud contracts" checkbox
|
|
- "Hide dust transactions below N gwei" checkbox + threshold input
|
|
- "UTC Timestamps" checkbox
|
|
- Allowed Sites: list with remove buttons
|
|
- Denied Sites: list with remove buttons
|
|
- About: project link, license, author, version, release date, and the
|
|
commit, which links to the commit in the repository
|
|
- Debug: hidden until revealed, then an "Enable debug mode" checkbox that
|
|
turns on the red banner and verbose logging
|
|
- **Transitions**:
|
|
- "+ Add wallet" → **AddWallet**
|
|
- "+ Add token" → **SettingsAddToken**
|
|
- `[x]` on a wallet → **DeleteWallet**
|
|
- Tap wallet name → inline rename field (no screen change)
|
|
- `[x]` on a tracked token or a site → removes it in place (no screen
|
|
change)
|
|
- Ten clicks on the version → reveals the Debug well (no screen change)
|
|
- "Back" (or Settings gear again) → previous screen (Home)
|
|
|
|
#### DeleteWallet (`delete-wallet-confirm`)
|
|
|
|
- **When**: User tapped the `[x]` next to a wallet in Settings.
|
|
- **Elements**:
|
|
- "Back" button, "Delete Wallet" heading
|
|
- Warning naming the wallet and stating that deletion is permanent and any
|
|
funds are unrecoverable without the recovery phrase
|
|
- Error line
|
|
- Password input
|
|
- "Confirm Delete" button
|
|
- **Transitions**:
|
|
- "Confirm Delete" (correct password, other wallets remain) → deletes the
|
|
wallet and its site permissions, then → **Settings** with a "Wallet
|
|
deleted." flash message
|
|
- "Confirm Delete" (correct password, last wallet) → deletes the wallet,
|
|
clears the selection and the navigation stack, then → **Welcome**
|
|
- Either way, the active address moves only if it belonged to the deleted
|
|
wallet, and `AUTISTMASK_ACTIVE_CHANGED` is broadcast when it does
|
|
(`src/shared/walletDelete.js`)
|
|
- "Confirm Delete" (wrong password) → "Wrong password." on the error line,
|
|
nothing deleted
|
|
- "Back" → previous screen (Settings)
|
|
|
|
#### SettingsAddToken (`settings-addtoken`)
|
|
|
|
- **When**: User tapped "+ Add token" in Settings. Tokens added here are tracked
|
|
across every address, unlike AddToken which is reached from one address.
|
|
- **Elements**:
|
|
- "Back" button, "Add Token" heading
|
|
- Instruction text
|
|
- "Top tokens:" quick-pick buttons (top 10 by market cap; already-tracked
|
|
tokens are disabled)
|
|
- "Or pick from top 100:" dropdown (already-tracked tokens are disabled) +
|
|
"Add selected" button
|
|
- "Or enter contract address:" input, a status line, and an "Add" button
|
|
- **Transitions**:
|
|
- Any of the three add paths, on success → adds the token and shows an
|
|
"Added SYMBOL" flash message (no screen change)
|
|
- A duplicate, a scam-listed address, or a failed contract lookup → flash
|
|
message, no screen change
|
|
- "Back" → previous screen (Settings)
|
|
|
|
#### SiteApproval (`approve-site`)
|
|
|
|
- **When**: A website requests wallet access via `eth_requestAccounts` or
|
|
`wallet_requestPermissions` and is on neither the allowed nor the denied list.
|
|
The background script prefers the toolbar popup (`action.openPopup()`) and
|
|
falls back to a separate popup window (`src/background/index.js`,
|
|
`requestApproval()`).
|
|
- **Elements**:
|
|
- "Connection Request" heading
|
|
- Phishing warning banner (shown when the hostname is on the phishing
|
|
blocklist)
|
|
- Site hostname (bold) + "wants to connect to your wallet"
|
|
- Address that will be shared (color dot + full address + etherscan link)
|
|
- "Remember my choice for this site" checkbox
|
|
- "Allow" / "Deny" buttons
|
|
- **Transitions**:
|
|
- "Allow" / "Deny" → closes popup (returns result to background script; the
|
|
choice is persisted to the allowed or denied list when "Remember" is
|
|
checked)
|
|
- Popup closed without answering → treated as a denial
|
|
|
|
#### TxApproval (`approve-tx`)
|
|
|
|
- **When**: A connected website requests a transaction via
|
|
`eth_sendTransaction`. Always opened in a separate popup window by the
|
|
background script (`windows.create()`), because the request is triggered
|
|
programmatically rather than by a user gesture.
|
|
- **Elements**:
|
|
- "Transaction Request" heading
|
|
- Phishing warning banner (shown when the hostname is on the phishing
|
|
blocklist)
|
|
- Site hostname (bold) + "wants to send a transaction"
|
|
- Decoded action (if calldata is recognized): action name, token details,
|
|
amounts, steps, deadline (see Transaction Decoding)
|
|
- From: color dot + full address + etherscan link
|
|
- Contract: color dot + full address + etherscan link (or "contract
|
|
creation"), token symbol label if known
|
|
- Value: amount in ETH (4 decimal places, USD in parentheses)
|
|
- Raw data: full calldata displayed inline (shown if present)
|
|
- Password input and an error line
|
|
- "Confirm" / "Reject" buttons
|
|
- **Transitions**:
|
|
- "Confirm" (correct password) → decrypts and signs in the popup, hands the
|
|
signed transaction to the background to broadcast, then → **WaitTx** in
|
|
the same popup window
|
|
- "Confirm" (wrong password) → error line, no screen change
|
|
- "Reject" → closes popup (returns rejection to background)
|
|
- Popup window closed without answering → the request is rejected with
|
|
EIP-1193 code 4001
|
|
|
|
#### SignApproval (`approve-sign`)
|
|
|
|
- **When**: A connected website requests a message signature via
|
|
`personal_sign`, `eth_sign`, or `eth_signTypedData_v4`. Opened the same way as
|
|
TxApproval, in a separate popup window.
|
|
- **Elements**:
|
|
- "Signature Request" heading
|
|
- Phishing warning banner (shown when the hostname is on the phishing
|
|
blocklist)
|
|
- Site hostname (bold) + "wants you to sign a message"
|
|
- Danger warning box (shown for `eth_sign`, which signs a raw hash)
|
|
- Type: "Personal message" or "Typed data (EIP-712)"
|
|
- From: color dot + full address + etherscan link
|
|
- Message: decoded UTF-8 text (personal_sign) or formatted domain/type/
|
|
message fields (EIP-712 typed data)
|
|
- Password input and an error line
|
|
- "Sign" / "Reject" buttons
|
|
- **Transitions**:
|
|
- "Sign" (correct password) → signs locally → closes popup (returns
|
|
signature)
|
|
- "Sign" (wrong password, or a signing failure) → error line, no screen
|
|
change
|
|
- "Reject" → closes popup (returns rejection to background)
|
|
- Popup window closed without answering → the request is rejected with
|
|
EIP-1193 code 4001
|
|
|
|
### External Services
|
|
|
|
AutistMask is not a fully self-contained offline tool. It necessarily
|
|
communicates with three external services to function as a wallet:
|
|
|
|
- **Ethereum JSON-RPC endpoint**: The extension needs an Ethereum node to query
|
|
balances (`eth_getBalance`), read ERC-20 token contracts (`eth_call`),
|
|
estimate gas (`eth_estimateGas`), fetch nonces (`eth_getTransactionCount`),
|
|
broadcast transactions (`eth_sendRawTransaction`), and check transaction
|
|
receipts. The default endpoint is a public RPC (configurable by the user to
|
|
any endpoint they prefer, including a local node). By default the extension
|
|
talks to `https://ethereum-rpc.publicnode.com`.
|
|
- **Data sent**: Ethereum addresses, transaction data, contract call
|
|
parameters. The RPC endpoint can see all on-chain queries and submitted
|
|
transactions.
|
|
|
|
- **CoinDesk CADLI price API**: Used to fetch ETH/USD and token/USD prices for
|
|
displaying fiat values. The price is cached for 5 minutes to avoid excessive
|
|
requests. No API key required. No user data is sent — only a list of token
|
|
symbols. Note that CoinDesk will receive your client IP.
|
|
- **Data sent**: Token symbol strings only (e.g. "ETH", "USDC"). No
|
|
addresses or user-specific data.
|
|
|
|
- **Blockscout block-explorer API**: Used to fetch transaction history (normal
|
|
transactions and ERC-20 token transfers), ERC-20 token balances, and token
|
|
holder counts (for spam filtering). The default endpoint is
|
|
`https://eth.blockscout.com/api/v2` (configurable by the user in Settings).
|
|
- **Data sent**: Ethereum addresses. Blockscout receives the user's
|
|
addresses to query their transaction history and token balances. No
|
|
private keys, passwords, or signing operations are sent.
|
|
|
|
What the extension does NOT do:
|
|
|
|
- No analytics or telemetry services
|
|
- No token list APIs (the top-250 token list is bundled at build time)
|
|
- No Infura/Alchemy dependency (any JSON-RPC endpoint works)
|
|
- No backend servers operated by the developer
|
|
|
|
In addition to the three user-configurable services above (RPC endpoint,
|
|
CoinDesk price API, and Blockscout API), AutistMask also contacts:
|
|
|
|
- **Phishing domain blocklist**: A community-maintained phishing domain
|
|
blocklist is vendored into the extension at build time. At runtime, the
|
|
extension fetches the live list once every 24 hours to detect newly added
|
|
domains. Only the delta (domains not already in the vendored list) is kept in
|
|
memory, keeping runtime memory usage small. The delta is persisted to
|
|
localStorage if it is under 256 KiB.
|
|
- **Etherscan address labels**: When confirming a transaction, the extension
|
|
performs a best-effort lookup of the recipient address on Etherscan to check
|
|
for phishing/scam labels. This is a direct page fetch with no API key; the
|
|
user's browser makes the request.
|
|
|
|
Users who want maximum privacy can point the RPC and Blockscout URLs at their
|
|
own self-hosted instances (price fetching can be disabled in a future version).
|
|
|
|
### Dependencies
|
|
|
|
AutistMask uses four runtime libraries. All cryptographic operations are
|
|
delegated to ethers and libsodium — see the Crypto Policy section below.
|
|
|
|
| Package | Version | License | Purpose |
|
|
| -------------------------- | ------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
|
| `ethers` | 6.16.0 | MIT | All Ethereum operations: BIP-39 mnemonic generation/validation, BIP-32/BIP-44 HD key derivation (`m/44'/60'/0'/0/n`), secp256k1 signing, transaction construction, ERC-20 contract interaction, JSON-RPC communication, address derivation (keccak256). |
|
|
| `libsodium-wrappers-sumo` | 0.8.2 | ISC | Password-based encryption of secrets at rest: Argon2id key derivation (`crypto_pwhash`), authenticated encryption (`crypto_secretbox` / XSalsa20-Poly1305). |
|
|
| `qrcode` | 1.5.4 | MIT | QR code generation for the Receive screen (renders address as scannable QR on canvas). |
|
|
| `ethereum-blockies-base64` | 1.0.2 | ISC | Deterministic pixelated identicon generation from Ethereum addresses (same style used by Etherscan). |
|
|
|
|
Dev dependencies (not shipped in extension):
|
|
|
|
| Package | Version | License | Purpose |
|
|
| ------------------ | ------- | ------- | ------------------------- |
|
|
| `esbuild` | 0.27.3 | MIT | JS bundler (inlines deps) |
|
|
| `tailwindcss` | 4.2.1 | MIT | CSS compilation |
|
|
| `@tailwindcss/cli` | 4.2.1 | MIT | Tailwind CLI |
|
|
| `jest` | 30.2.0 | MIT | Test runner |
|
|
| `prettier` | 3.8.1 | MIT | Code formatter |
|
|
|
|
### Crypto Policy
|
|
|
|
**No raw crypto primitives in application code.** If the strings `aes`, `sha`,
|
|
`pbkdf`, `hmac`, `encrypt`, `decrypt`, `hash`, `cipher`, `digest`, `sign`
|
|
(case-insensitive) appear in our own source code (outside of `node_modules/`),
|
|
it is almost certainly a bug. All cryptographic operations must go through
|
|
`ethers` or `libsodium-wrappers-sumo`. Both are widely audited and
|
|
battle-tested.
|
|
|
|
Exceptions require explicit authorization in a code comment referencing this
|
|
policy, but as of now there are none.
|
|
|
|
### DEBUG Mode Policy
|
|
|
|
The `DEBUG` constant in the popup JS enables a red "DEBUG / INSECURE" banner and
|
|
a hardcoded test mnemonic. **DEBUG mode must behave as close to normal mode as
|
|
possible.** No `if (DEBUG)` branches that skip functionality, bypass security
|
|
flows, or alter program behavior beyond the banner and the hardcoded mnemonic.
|
|
Adding new DEBUG-conditional branches requires explicit approval from the
|
|
project owner.
|
|
|
|
`DEBUG` is a build-time constant, not a runtime setting. `build.js` injects it
|
|
into the bundle as the `__BUILD_DEBUG__` define — `false` unless the build was
|
|
run with `AUTISTMASK_DEBUG=1` (see [Debug Builds](#debug-builds)) — and
|
|
`src/shared/constants.js` reads it. It cannot be changed after the bundle is
|
|
produced.
|
|
|
|
The debug-mode toggle in settings is a separate, runtime-only flag. It raises
|
|
the log level and turns the banner on, and that is all it may ever do: it feeds
|
|
`isDebug()` in `src/shared/log.js`, which is deliberately not what
|
|
`generateMnemonic()` consults. Mnemonic generation reads the build-time `DEBUG`
|
|
constant directly, so no runtime toggle in a release build can reach the
|
|
hardcoded test phrase.
|
|
|
|
### Key Decisions
|
|
|
|
- **No framework**: The popup UI is vanilla JS and HTML. The extension is small
|
|
enough that a framework adds unnecessary complexity and attack surface.
|
|
- **Split storage model**: Public data (xpubs, derived addresses, token lists,
|
|
balances) is stored unencrypted in extension local storage so the user can
|
|
view their wallets and balances at any time without entering a password.
|
|
Private data (recovery phrases, private keys) will be encrypted at rest using
|
|
libsodium — a password is only required when the user needs to sign a
|
|
transaction or message. The encryption scheme for private data:
|
|
- The user's password is run through Argon2id (`crypto_pwhash`) to derive a
|
|
256-bit encryption key. Argon2id is memory-hard, making GPU/ASIC brute
|
|
force attacks expensive.
|
|
- The derived key encrypts the secret material using XSalsa20-Poly1305
|
|
(`crypto_secretbox`), which provides authenticated encryption (the
|
|
ciphertext cannot be tampered with without detection).
|
|
- Stored blob: `{ salt, nonce, ciphertext }` (the auth tag is part of the
|
|
`crypto_secretbox` output).
|
|
- **The password is NOT used in address derivation.** It exists solely to
|
|
protect the recovery phrase / private key on disk. Anyone with the
|
|
recovery phrase can restore the wallet on any device without this
|
|
password. This matches standard EVM wallet behavior.
|
|
- **BIP-39 / BIP-44 via ethers.js**: Mnemonic generation, validation, and HD key
|
|
derivation (`m/44'/60'/0'/0/n`) are handled entirely by ethers.js. The BIP-39
|
|
passphrase is always empty (matching most wallet software). The user's
|
|
password is completely separate and has no effect on which addresses are
|
|
generated.
|
|
- **ethers.js for everything Ethereum**: Transaction construction, signing, gas
|
|
estimation, RPC communication, ERC-20 contract calls, and address derivation
|
|
are all handled by ethers.js. This means zero hand-rolled Ethereum logic.
|
|
- **EIP-1193 provider**: The content script injects a `window.ethereum` object
|
|
that implements the EIP-1193 provider interface, enabling web3 site
|
|
connectivity.
|
|
- **Minimal RPC**: The extension communicates with Ethereum nodes via JSON-RPC
|
|
through ethers.js's `JsonRpcProvider`. The default endpoint is configurable.
|
|
No Infura dependency — users can point it at any Ethereum JSON-RPC endpoint.
|
|
|
|
### Supported Functionality
|
|
|
|
- Create new HD wallet (generates 12-word recovery phrase)
|
|
- Import HD wallet from existing 12 or 24 word recovery phrase
|
|
- Import single-address wallet from private key
|
|
- Import multi-address wallet from an extended private key (`xprv`)
|
|
- Add multiple addresses within an HD wallet
|
|
- Manage multiple wallets simultaneously
|
|
- View ETH balance per address
|
|
- View ERC-20 token balances (bundled top-250 tokens, tokens with 1,000 or more
|
|
holders, and tokens the user adds by contract address)
|
|
- Send ETH to an address
|
|
- Send ERC-20 tokens to an address
|
|
- Receive ETH/tokens (display address, copy to clipboard, QR code)
|
|
- Connect to web3 sites (EIP-1193 `eth_requestAccounts`)
|
|
- Sign transactions requested by connected sites (`eth_sendTransaction`)
|
|
- Sign messages (`personal_sign`, `eth_sign`)
|
|
- Sign typed data (`eth_signTypedData_v4`, `eth_signTypedData`)
|
|
- Human-readable transaction decoding (ERC-20, Uniswap Universal Router)
|
|
- ETH/USD and token/USD price display
|
|
- Configurable RPC endpoint and Blockscout API
|
|
- Address poisoning protection (spam token filtering, dust filtering, fraud
|
|
contract blocklist)
|
|
|
|
### Address Poisoning and Fake Token Transfer Attacks
|
|
|
|
During development, one of our test addresses
|
|
(`0x66133E8ea0f5D1d612D2502a968757D1048c214a`) sent 0.005 ETH to
|
|
`0xC3c693Ae04BaD5f13C45885C1e85a9557798f37E`. Within seconds, a fraudulent
|
|
transaction appeared in the address's token transfer history
|
|
(`0x85215772ed26ea8b39c2b3b18779030487efbe0b5fd7e882592b2f62b837be84`) showing a
|
|
0.005 "ETH" transfer from our address to
|
|
`0xC3C0AEA127c575B9FFD03BF11C6a878e8979c37F` — a scam address whose first four
|
|
characters (`0xC3C0`) visually resemble the legitimate recipient (`0xC3c6`).
|
|
|
|
**How it works:** A scammer deploys a malicious ERC-20 contract (in this case,
|
|
`0xD05339f9Ea5ab9d9F03B9d57F671d2abD1F55c82`, a fake token calling itself
|
|
"Ethereum" with symbol "ETH" and zero holders). This contract has a function
|
|
that emits an ERC-20 `Transfer(from, to, amount)` event with arbitrary
|
|
parameters. The EVM does not enforce that the `from` address in a Transfer event
|
|
actually initiated or authorized the transfer — any contract can emit any event
|
|
with any parameters. The scammer calls their contract, which emits a Transfer
|
|
event claiming the victim sent tokens to the scam address. Every blockchain
|
|
indexer (Blockscout, Etherscan, etc.) sees a valid Transfer event log and
|
|
indexes it as a real token transfer.
|
|
|
|
**The attack has two goals:**
|
|
|
|
1. **Autocomplete poisoning**: Wallets that offer address autocomplete based on
|
|
transaction history will suggest the scam address (which looks similar to a
|
|
legitimate recent recipient) when the user starts typing. The user copies the
|
|
wrong address and sends real funds to the scammer.
|
|
|
|
2. **Transaction history confusion**: The fake transfer appears in the victim's
|
|
history as an outbound transaction, making it look like the user sent funds
|
|
to the scam address. Users who copy-paste addresses from their own
|
|
transaction history may grab the wrong one.
|
|
|
|
**What AutistMask does about it:**
|
|
|
|
- **Minimal, careful truncation**: Where space constraints require truncation
|
|
(e.g. the transaction history list), AutistMask truncates conservatively —
|
|
displaying enough characters that generating a vanity address matching the
|
|
visible portion is computationally infeasible. All confirmation screens
|
|
(transaction signing, send confirmation) display the complete untruncated
|
|
address. Users should always verify the full address on the confirmation
|
|
screen before signing or sending.
|
|
|
|
- **Known token symbol verification**: AutistMask ships a hardcoded list of the
|
|
top 250 ERC-20 tokens with their legitimate contract addresses and symbols.
|
|
Any token transfer claiming a symbol from this list (e.g. "ETH", "USDT",
|
|
"USDC") but originating from an unrecognized contract address is identified as
|
|
a spoof and filtered from display. The fake "Ethereum" token in the attack
|
|
above used symbol "ETH" from contract
|
|
`0xD05339f9Ea5ab9d9F03B9d57F671d2abD1F55c82`, which does not match the known
|
|
WETH contract — so it would be caught by this check.
|
|
|
|
- **Low-holder token filtering**: Token transfers from ERC-20 contracts with
|
|
fewer than 1,000 holders are hidden from transaction history by default.
|
|
Legitimate tokens have substantial holder counts; poisoning tokens typically
|
|
have zero. This catches new poisoning contracts that use novel symbols not in
|
|
the known token list.
|
|
|
|
- **Fraud contract blocklist**: AutistMask maintains a local list of known fraud
|
|
contract addresses. Token transfers involving these contracts are filtered
|
|
from the transaction history display. The list is populated when a fraudulent
|
|
transfer is detected and persists across sessions.
|
|
|
|
- **Send-side token filtering**: Tokens with fewer than 1,000 holders are
|
|
excluded from the token selector on the send screen. This prevents users from
|
|
accidentally interacting with a spoofed token that appeared in their balance
|
|
via a fake Transfer event.
|
|
|
|
- **Dust transaction filtering**: A second wave of the same attack used real
|
|
native ETH transfers instead of fake tokens. Transaction
|
|
`0x2708ebddfb9b5fa3f7a89d3ea398ef9fd8771b83ed861ecb7c21cd55d18edc74` sent 1
|
|
gwei (0.000000001 ETH) from `0xC3c6B3b4402bD78A9582aB6b00E747769344F37E` —
|
|
another look-alike of the legitimate recipient `0xC3c693...`. Because this is
|
|
a real ETH transfer (not a fake token), none of the token-level filters catch
|
|
it. AutistMask hides transactions below a configurable dust threshold
|
|
(default: 100,000 gwei / 0.0001 ETH). This is high enough to filter poisoning
|
|
dust while low enough to preserve any transfer a user would plausibly care
|
|
about. The threshold is user-configurable in Settings.
|
|
|
|
- **User-configurable**: All of the above filters (known symbol verification,
|
|
low-holder threshold, fraud contract blocklist, dust threshold) are settings
|
|
that default to on but can be individually disabled by the user. AutistMask is
|
|
designed as a sharp tool — users who understand the risks can configure the
|
|
wallet to show everything unfiltered, unix-style.
|
|
|
|
#### Phishing Domain Protection
|
|
|
|
AutistMask protects users from known phishing sites when they connect their
|
|
wallet or approve transactions/signatures. A community-maintained domain
|
|
blocklist is vendored into the extension at build time, providing immediate
|
|
protection without any network requests. At runtime, the extension fetches the
|
|
live list once every 24 hours and keeps only the delta (newly added domains not
|
|
in the vendored list) in memory. This architecture keeps runtime memory usage
|
|
small while ensuring fresh coverage of new phishing domains.
|
|
|
|
When a dApp on a blocklisted domain requests a wallet connection, transaction
|
|
approval, or signature, the approval popup displays a prominent red warning
|
|
banner alerting the user. The domain checker matches exact hostnames and all
|
|
parent domains (subdomain matching).
|
|
|
|
#### Transaction Decoding
|
|
|
|
When a dApp asks the user to approve a transaction, AutistMask attempts to
|
|
decode the calldata into a human-readable summary. This is purely a display
|
|
convenience to help the user understand what they are signing — it is not
|
|
endorsement, special treatment, or partnership with any protocol.
|
|
|
|
AutistMask is a generic web3 wallet. It treats all dApps, protocols, and
|
|
contracts equally. No contract gets special handling, priority, or integration
|
|
beyond what is needed to show the user a legible confirmation screen. Our
|
|
commitment is to the user, not to any service, site, or contract.
|
|
|
|
Decoded transaction summaries are best-effort. If decoding fails, the raw
|
|
calldata is displayed in full. The decoders live in self-contained modules under
|
|
`src/shared/` (e.g. `uniswap.js`) so they can be added for common contracts
|
|
without polluting wallet-specific code. Contributions of decoders for other
|
|
widely-used contracts are welcome.
|
|
|
|
Currently supported:
|
|
|
|
- **ERC-20**: `approve()` and `transfer()` calls — shows token symbol, spender
|
|
or recipient, and amount.
|
|
- **Uniswap Universal Router**: `execute()` calls — shows swap direction (e.g.
|
|
"Swap USDT → ETH"), token addresses, amounts, execution steps, and deadline.
|
|
Decodes Permit2, V2/V3/V4 swaps, wrap/unwrap, and balance checks.
|
|
|
|
### Non-Goals Forever
|
|
|
|
- Built in token swaps (use a DEX in the browser)
|
|
- Analytics, telemetry, or tracking of any kind
|
|
- Advertisements or promotions
|
|
- Obscure token list auto-discovery — nothing outside the bundled list, the
|
|
1,000-holder floor, and the tokens the user added by contract address
|
|
- We detect common/popular ERC20s in the basic case
|
|
- Fiat on/off ramps
|
|
- Extensive transaction decoding/parsing
|
|
- For common ones we will do best-effort, but you should just use a block
|
|
explorer.
|
|
|
|
### Non-Goals for 1.0
|
|
|
|
- Multi-chain support (Ethereum mainnet only)
|
|
- Hardware wallet support
|
|
|
|
## TODO
|
|
|
|
### Wallet Management
|
|
|
|
- [x] Delete wallet (with confirmation)
|
|
- [ ] Delete address from HD wallet (with confirmation)
|
|
- [ ] Show wallet's recovery phrase (requires password)
|
|
|
|
### Transactions
|
|
|
|
- [x] Gas estimation and fee display before confirming
|
|
|
|
### Testing
|
|
|
|
- [ ] Tests for mnemonic generation and address derivation
|
|
- [ ] Tests for xpub derivation and child address generation
|
|
- [ ] Test on Firefox (Manifest V2)
|
|
|
|
### Scam List
|
|
|
|
- [ ] Research and document each address in scamlist.js
|
|
- [ ] Add more known fraud addresses from Etherscan labels
|
|
|
|
### Future
|
|
|
|
- [ ] Multi-currency fiat display (EUR, GBP, etc.)
|
|
- [ ] Security audit of key management
|
|
|
|
## Policies
|
|
|
|
- We don't mention "the other wallet" by name in code or documentation. We're
|
|
our own thing.
|
|
- The README is the complete authoritative technical documentation. It's ok if
|
|
it gets big.
|
|
|
|
## License
|
|
|
|
GPL-3.0. See [LICENSE](LICENSE).
|
|
|
|
### Third-Party Data Files
|
|
|
|
This repository includes data files from third-party projects that are not
|
|
covered by the GPL-3.0 license above. These files, their copyright holders, and
|
|
their licenses are:
|
|
|
|
| File | Source | Copyright | License |
|
|
| ---------------------------------------------------------- | --------------------------------------------------------------------------------------------------------- | --------------------------------- | -------------------------------------------------------------- |
|
|
| `src/shared/phishingBlocklist.json` | `eth-phishing-detect` community-maintained phishing domain blocklist, vendored from its `src/config.json` | Copyright (c) 2018 kumavis | [DBAD (Don't Be a Dick)](https://github.com/philsturgeon/dbad) |
|
|
| `src/shared/scamlist.js` (address data from MyEtherWallet) | [ethereum-lists](https://github.com/MyEtherWallet/ethereum-lists) `addresses-darklist.json` | Copyright (c) 2020 MyEtherWallet | MIT |
|
|
| `src/shared/scamlist.js` (address data from EtherScamDB) | [EtherScamDB](https://github.com/MrLuit/EtherScamDB) `scams.yaml` | Copyright (c) 2018 Luit Hollander | MIT |
|
|
|
|
The full license texts for these third-party files are included in the
|
|
[LICENSE](LICENSE) file. The `eth-phishing-detect` row carries no repository
|
|
link because the upstream is hosted under a competitor's organization name,
|
|
which project policy keeps out of code and documentation; the vendored copy and
|
|
the runtime refresh both come from that upstream, whose URL is the
|
|
`BLOCKLIST_URL` constant in `src/shared/phishingDomains.js`.
|
|
|
|
## Author
|
|
|
|
[@sneak](https://sneak.berlin)
|