1. Verify the download
Compute the file’s SHA-256 and compare it with the value above. They must match exactly.
macOS or Linux
shasum -a 256 bip39-ai-offline-v0.1.0.htmlWindows (PowerShell)
Get-FileHash .\bip39-ai-offline-v0.1.0.html -Algorithm SHA256If they differ, delete the file and do not open it.
2. Use it offline
- Turn off Wi-Fi and unplug network cables (or use airplane mode).
- Open the file by double-clicking it, or drag it into a browser window. It opens as a
file://page. - Check the badge at the top reads Offline build v0.1.0.
- When finished, close the tab and browser before reconnecting.
Consider a private/incognito window: most browsers disable extensions there unless you have allowed them.
3. Confirm there are no network requests
- Open developer tools (F12, or ⌥ ⌘ I on macOS) and select Network.
- Reload the page and use each tool.
- The list should contain only the file itself. The file’s Content Security Policy also blocks connections, which you can read in its first lines.
Release evidence
| Item | Status |
|---|---|
| SHA-256 published | Yes on this page |
| Official test vectors | Pass 24/24 English vectors, checked on every build |
| Independent implementation cross-check | Pass 120 cases vs python-mnemonic 0.21 |
| Source tag for this release | v0.1.0 |
| Reproducible build | Not yet available |
| Signed release | Not yet available |
| Independent security audit | Not yet available |
Limitations
- It cannot protect against an infected computer, malicious browser extensions, screen recording or clipboard monitoring.
- Clearing a field resets the page, but JavaScript cannot guarantee every copy is erased from memory. Close the browser when done.
- It does not derive private keys or addresses and cannot recover wallets.