web-tools — tools.cding.org

Static client-side utilities. Everything runs in your browser; nothing is sent to a server.

Live: https://tools.cding.org

Tools

• /kelly/ — Kelly Criterion calculator (probability/odds, win-loss-prob, mean-variance)
• /timestamp/ — Unix ↔ ISO 8601 ↔ RFC 2822 ↔ Locale converter with timezone selector
• /bitcoin/ — Private key → 5 mainnet address types (P2PKH, P2SH-SegWit, P2WPKH, P2TR) with full derivation steps
• /ethereum/ — Private key → EIP-55-checksummed address with full derivation steps

Bilingual: English + Simplified Chinese, auto-detected and togglable.

Local development

python3 -m http.server 8000
# open http://localhost:8000/

Service worker registration requires localhost or HTTPS — file:// URLs will not work.

Running tests

Open http://localhost:8000/tests/ in any modern browser. The page runs all golden-vector tests on load and prints PASS/FAIL for each, with totals at the bottom.

Updating vendored crypto libraries

The site vendors @noble/curves, @noble/hashes, and @scure/base under assets/vendor/. To bump versions:

./scripts/vendor.sh

This pins versions, mirrors the npm package trees, and rewrites LICENSE-vendor.md with SHA-256 hashes.

License

Application code: MIT (see LICENSE). Vendored libraries: MIT, attributions in LICENSE-vendor.md.

Deployment

This site is deployed via GitHub Pages from the master branch root.

Settings → Pages →

• Source: "Deploy from a branch"
• Branch: master / Folder: /
• Custom domain: tools.cding.org
• Enforce HTTPS: enable AFTER domain verification completes

The CNAME file at the repo root binds the site to the domain. The .nojekyll file disables Jekyll processing so paths like _* files (none here, but a safe default) work as expected.

DNS: tools.cding.org is a CNAME pointing to ccding.github.io (recommended) or pages.github.com (legacy). Either works. If "Enforce HTTPS" is unavailable after 24h, switch the CNAME to ccding.github.io and verify the domain via account Settings → Pages → "Add a verified domain" (adds a TXT record at _github-pages-challenge-ccding.cding.org).

Service worker registration requires HTTPS; the four tool pages still function over plain HTTP, but the PWA install / offline mode only activates over HTTPS or localhost.