For real Bitcoin funds
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.
SHA‑256(csprng ‖ user_input) and logged in the report so you can recreate the seed offline.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.
computing…
Import the public keys into a watch‑only wallet (Sparrow, Electrum, BlueWallet, Nunchuk…) to monitor funds without exposing the seed. Private keys let you fully import the wallet and spend — handle with the same care as the seed.
computing…Derivation path m/purpose'/0'/0'/0/i. Computed locally from the seed and the passphrase above — no network calls.
Choose what to save. The default gives you all three files, each as a separate download. Only the encrypted .enc file can be opened later in Amulet Scryer to watch this wallet's balance.
The .txt and .pdf hold your seed in the clear, exactly like writing it on paper, and the PDF SeedQR is itself a scannable seed. Keep those files offline. The .enc file is encrypted with a password you choose.
Done copying everything to paper or steel? Scrub this browser tab.