specter-desktop

Imported from cryptoadvance/specter-desktop (AGENTS.md). Install upstream with npx skills add cryptoadvance/specter-desktop. Copyright stays with the author.

AGENTS.md — Specter Desktop

Guidelines for AI contributors working on specter-desktop.

Project Overview

Specter Desktop is a GUI for Bitcoin Core & Electrum optimized for airgapped hardware wallets. It's a Flask web app that manages multisig wallets, coordinates hardware wallet signing via HWI, and handles PSBT-based transaction workflows.

License: MIT Stack: Python 3.9-3.10, Flask, Jinja2 templates, plain JavaScript (no frameworks), JSON file persistence, PyInstaller for desktop builds Status: Reviving. Last release v2.1.1 (2025-01-03). Release pipeline recently migrated to GitHub Actions. See "Current State" section at the bottom.

Architecture (Quick Reference)

src/cryptoadvance/specter/
├── server.py          # Flask app factory, create_and_init()
├── cli/               # CLI entry point (specter command)
├── managers/           # Core business logic
│   ├── device_manager.py    # Hardware wallet device registry
│   ├── wallet_manager.py    # Wallet CRUD + balance/tx tracking
│   ├── node_manager.py      # Bitcoin Core / Electrum connections
│   └── user_manager.py      # Auth + RBAC
├── rpc.py             # Bitcoin Core JSON-RPC client
├── persistence.py     # JSON file storage (no SQL)
├── device.py          # Device domain model + HWI glue
├── wallet/            # Wallet domain logic, descriptors, address/tx helpers
├── util/
│   └── psbt.py        # PSBT utilities (parse, analyze, finalize)
├── devices/
│   └── hwi/           # HWI-based hardware wallet drivers (Jade, KeepKey, DIY)
├── hwi_rpc.py         # HWI JSON-RPC wrapper
├── hwi_server.py      # HWI bridge subprocess (for GUI builds)
├── templates/         # Jinja2 HTML templates
├── static/            # CSS/JS/images
└── services/          # Extension system (specterext namespace packages)

Key patterns:

• Manager pattern: each domain has a *Manager class that owns the lifecycle
• JSON file persistence in ~/.specter/ (devices, wallets, nodes as JSON files)
• Extensions via specterext namespace packages with their own Flask blueprints
• HWI bridge for hardware wallet communication (Trezor, Ledger, ColdCard, etc.)
• PSBT workflow: construct → sign (hardware) → broadcast

Running from Source

# Prerequisites (Ubuntu/Debian)
sudo apt install libusb-1.0-0-dev libudev-dev libffi-dev libssl-dev build-essential

# Clone and set up
git clone https://github.com/cryptoadvance/specter-desktop.git
cd specter-desktop
pip3 install virtualenv
virtualenv --python=python3.10 .env
source .env/bin/activate
pip3 install -r requirements.txt --require-hashes
pip3 install -e .

# Run dev server
python3 -m cryptoadvance.specter server --config DevelopmentConfig --debug
# → http://127.0.0.1:25441/

Python version: 3.9 or 3.10 required. 3.11+ will break on some dependencies.

CI/CD

GitHub Actions only. Cirrus CI and GitLab CI were retired in 2026-Q2 — see docs/ci-migration-evidence.md for the cutover evidence and docs/continuous-integration.md for the active topology.

Workflows

All workflows use public GitHub-hosted runners (ubuntu-latest / ubuntu-22.04 / windows-latest / macos-14). No private runners.

Test workflow — test.yml

Three jobs on ubuntu-22.04:

1. test — pytest with --cov=cryptoadvance, 45-min timeout. Installs system deps inline; no custom image. Caches bitcoind/elementsd via actions/cache@v4 keyed on runner.os × runner.arch × hash(pyproject.toml, install_noded.sh, bitcoin_SHA256SUMS, elements_SHA256SUMS) with save-always: true.
2. cypress — ./utils/test-cypress.sh --debug run inside ghcr.io/cryptoadvance/specter-desktop/cypress-python-jammy@sha256:<digest>, 30-min timeout, --shm-size=2g.
3. extension-smoketest — byte-compatible port of the old Cirrus smoketest, 15-min timeout.

tests/install_noded.sh GPG-verifies upstream SHA256SUMS.asc and checks tarball SHA256 against the committed trust anchors on every run (cold cache AND cache hit).

Release pipeline — .github/workflows/release.yml

Triggers on tags matching v[0-9]+.[0-9]+.[0-9]+ (and -* suffixes for pre-releases). Runs entirely on GitHub-hosted runners — no private hardware required.

Python version: pinned to 3.10 via the PYTHON_VERSION env var at the top of release.yml.

Jobs (10 total):

1. release-pip — Builds the pip package and publishes to PyPI via trusted publishing (no TWINE_PASSWORD secret needed when configured on PyPI; falls back to token auth otherwise). Only publishes when github.repository == 'cryptoadvance/specter-desktop'. Version derived from tag with -pre → rc PEP 440 mapping.
2. build-specterd-linux — PyInstaller build on ubuntu-latest. Produces specterd-<version>-x86_64-linux-gnu.zip.
3. build-specterd-windows — PyInstaller build on windows-latest. Produces specterd-<version>-win64.zip. Installs colorama (Windows-only transitive dep of click that isn't in the lock file).
4. build-specterd-macos — PyInstaller build on macos-14 (Apple Silicon). Produces specterd-<version>-osx_arm64.zip. x86_64 macOS build is commented out — requires a paid runner (macos-15-large); will be enabled when the org has a paid plan.
5. build-electron-linux — Needs build-specterd-linux. Downloads specterd artifact, wraps in Electron, produces specter_desktop-<version>-x86_64-linux-gnu.tar.gz.
6. build-electron-windows — Needs build-specterd-windows. Runs in electronuserland/builder:wine container on ubuntu-latest. Produces Specter-Setup-<version>.exe.
7. build-electron-macos — Needs build-specterd-macos. Universal-ish build on macos-14. Code signing is conditional: if APPLE_CERTIFICATE_BASE64 secret is set, imports cert into a temporary keychain and signs; otherwise builds unsigned. Removes hardcoded provisioning profile from package.json on the fly.
8. create-release — Gathers all artifacts, computes combined SHA256SUMS, creates the GitHub Release, uploads binaries.
9. trigger-docker — Triggers the docker-tag.yml workflow for the release tag (builds and pushes the Docker image).

Release artifacts per version:

• cryptoadvance.specter-<version>.tar.gz (pip package, published to PyPI)
• specterd-<version>-x86_64-linux-gnu.zip (Linux daemon)
• specterd-<version>-win64.zip (Windows daemon)
• specterd-<version>-osx_arm64.zip (macOS daemon, Apple Silicon)
• specter_desktop-<version>-x86_64-linux-gnu.tar.gz (Linux Electron app)
• Specter-Setup-<version>.exe (Windows Electron app)
• macOS Electron app (produced by build-electron-macos)
• SHA256SUMS (combined checksums, created by create-release)

macOS builds are now automated (Apple Silicon free tier). x86_64 macOS requires a paid runner and is disabled.

Release-related secrets (GitHub)

Testing a release on a fork

1. Fork cryptoadvance/specter-desktop on GitHub.
2. Push a tag matching v*.*.* or v*.*.*-* on your fork → release.yml fires automatically.
3. The release-pip PyPI publish step is gated on github.repository == 'cryptoadvance/specter-desktop', so forks build the pip package but don't publish.
4. Unsigned macOS builds work out of the box; signing requires you to add your own Apple secrets.

Testing

Tests require a bitcoind binary (regtest mode). No tests run without it.

# Install bitcoind for tests
./tests/install_noded.sh --bitcoin binary  # downloads binary
# OR
./tests/install_noded.sh --bitcoin compile  # compiles from source

# For Elements/Liquid tests (optional):
./tests/install_noded.sh --elements binary

# Install test dependencies
pip3 install -e ".[test]"

# Run tests
pytest                          # all tests (needs bitcoind)
pytest -m "not slow"            # skip slow tests
pytest -m "not elm"             # skip Elements/Liquid tests
pytest -m "not elm and not slow" # skip both
pytest tests/test_specter.py    # specific file
pytest tests/test_specter.py -k Manager  # match test name
pytest --capture=no --log-cli-level=DEBUG  # verbose output
pytest --bitcoind-log-stdout    # include bitcoind logs

Cypress (frontend tests):

npm ci                          # install JS dependencies first
./utils/test-cypress.sh run     # run all
./utils/test-cypress.sh open    # interactive mode
./utils/test-cypress.sh snapshot spec_empty_specter_home.js  # create baseline
./utils/test-cypress.sh dev spec_empty_specter_home.js       # dev against snapshot

Important test quirks:

• bitcoind starts once for all tests — blockchain state accumulates
• Halving interval is 150 blocks in regtest; 100 blocks needed for spendable coins
• Transaction IDs change depending on whether you run tests alone or together
• Don't hardcode txids in assertions across test suites
• You need Python 3.10 virtualenv for tests (ignore_cleanup_errors kwarg fails on 3.9)

Code Style

• Black for Python formatting (v22.3.0). Pre-commit hook: pre-commit install
• CI runs a Black linter check (.github/workflows/zblack.yml) — currently failing
• Plain JavaScript, no frameworks. Material Icons for UI.
• Colors: orange #F5A623, blue #4A90E2
• Minimize dependencies — security-conscious project

Building Releases

Desktop builds use PyInstaller + Electron:

1. specterd (daemon binary): pyinstaller specterd.spec from pyinstaller/ dir
2. Electron app: wraps specterd, downloads it on first launch with SHA256 + GPG verification
3. pip package: python3 -m build

Release builds live in .github/workflows/release.yml (triggered by tag push). See docs/release-guide.md for the release workflow and docs/build-instructions.md for step-by-step manual builds.

Dependencies

# After changing requirements.in:
pip-compile --generate-hashes requirements.in

Hash-pinned requirements for reproducibility and security. Don't bypass --require-hashes.

Extension System

Extensions live in specterext namespace packages. Each extension:

• Has its own Flask blueprint, templates, and static files
• Registers via entry points in setup.cfg
• Can add UI pages, API endpoints, and background services
• Generate a skeleton: python3 -m cryptoadvance.specter ext gen --ext-id myext --org myorg
• CI smoke-tests extension generation in the extension-smoketest job (test.yml)
• See docs/extensions/ for the extension development guide

Key Files for Navigation

Current State (as of 2026-04)

• Last release: v2.1.1 (2025-01-03) — no release on the new GH Actions pipeline yet; first tagged run will exercise it end-to-end.
• CI migration complete: Cirrus CI and GitLab CI retired; all workflows now on GitHub Actions. See docs/ci-migration-evidence.md.
• macOS automation: now covered on Apple Silicon free tier; x86_64 macOS gated on paid runner.
• Black linter: reconfigured to pin python-3.12 + psf/black@26.3.0 action + black version 22.3.0 (worked around 3.14 incompatibility). Verify green state in CI before assuming.
• Issue/PR backlog: refreshed counts not captured here — use gh issue list / gh pr list for current state.
• Goal: Revive with biweekly tested releases, shake out the new release pipeline, triage issues.

Contributing

1. Fork → branch from master → PR
2. Run pre-commit install for Black formatting
3. Reference issues in commits: Fixes #123
4. See CONTRIBUTING.md for full guidelines