SEEDER Kit with Dice

SEEDER is a sovereign, offline seed generator: a small open-source device that lets you create your own Bitcoin seed without relying on anyone. This kit comes with the SEEDER in its case and a set of dice, so you can generate your entropy by hand from day one.

You bring the entropy

The SEEDER has no random number generator. You roll the dice (50 rolls for 12 words, 99 for 24) or flip a coin (128 or 256 flips), and the SEEDER does the BIP39 maths in front of you, including the checksum that gives you the last word.

Verify it, don't trust it

The Entropy (hex) screen shows the exact bytes your words come from, so you can redo the maths with any offline BIP39 tool. Dice mode uses the same scheme as the Coldcard (SHA-256 of your rolls), so you can even check it from a terminal. If the words don't match, don't use the device.

Take it to your wallet

• Export QR with your 12 or 24 words.
• Watch-only QR with the account zpub, ready to scan into Sparrow Wallet so you can check your balance without exposing the seed.

Nothing leaves the device

Your seed only lives in RAM and disappears when you unplug it. It is never written to flash, and the firmware prints nothing over the serial port.

Open-source firmware, on our web flasher

The firmware is open source on GitHub and available on our web flasher: go to flasher.bitronics.store, choose Tools → Seeder and flash or update it straight from your browser, with nothing to install.

In the kit

• SEEDER in its case, with a colour screen and two buttons
• Dice to generate your entropy

Powered over USB-C. Based on an idea by Lunaticoin.