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Amulet

Offline BIP‑39 · BIP‑32 · In your browser · v1.51
Click for offline instructions

Built for long-term holders. A Bitcoin seed minted in your own room, on a machine you control, with no part you can't see. 256 bits from the browser's CSPRNG, optionally folded together with dice, cards, or keystrokes via SHA‑256. Reproducible to the byte if you ever want to check.

1Seed length
2Extra entropyOptional
Add your own randomness
Pick one source. Mixed into the seed via SHA‑256(csprng ‖ user_input) and logged in the report so you can recreate the seed offline.

CSPRNG only

No extra input. The browser's cryptographic RNG (256 bits) is the sole source — this is cryptographically sufficient on its own.

Everything happens locally. Nothing leaves your browser.