seedhammer / SeedHammer is on Nostr

Second generation engraving machine for bitcoin backups.

Last Notes

2026-07-04 07:08:31 UTC

FINALLY! We've sent out the shipping notification to the last order in our queue. We know this took MUCH longer than planned, and we really appreciate your patience.
If you have not yet received an email from us with instructions to have your order shipped, please write to support@seedhammer.com.
Please note: this excludes the OG Edition, which we're still hard at work to produce and ship.

2026-06-15 06:41:05 UTC

If you placed an order before May 2025, you may still have an unclaimed machine waiting. Please check your inbox for an email from order@seedhammer.com.

2026-04-17 08:14:38 UTC

Preorder customers 📦
Shipping is underway again and orders are going out first-in, first-out.
Keep an eye on your inbox 👀
we’ll email you as soon as your order is ready to ship.

2025-12-25 22:00:06 UTC

Merry Christmas!
Preorder shipments to the EU and USA are temporarily paused due to customs return issues. Short term we’re using workarounds; long term we’re relocating production to a more shipping-friendly country.

2025-11-10 14:33:15 UTC

After more than a year of iterative design and testing, our electronics have progressed through multiple PCB revisions - evolving from the Raspberry Pi Pico 1 to a fully custom design built around the RP2350 chip, designed with KiCad and manufactured by JLCPCB.
https://blossom.primal.net/f846c89aa0e5200aa636a69be94ae020bad02106fc02e16ca0c9fbce4b4a581f.jpg

2025-09-24 21:25:31 UTC

- reply

Check DM

2025-09-23 21:56:24 UTC

We are finally shipping!
Everyone that ordered on or before December 22 should have received an email with instructions.
We are shipping from Switzerland and have postponed US shipping until the tariffs issue settle.

2025-09-09 10:40:19 UTC

- reply

We’re getting 16 units ready to ship to the warehouse.
The EU → rest-of-world process is still being finalized.
US customers have to wait while tariff systems settle.
We’ll post shipping prices on our website and start sending individual orders as soon as possible.
#nevent1q…7wj4

2025-08-17 09:00:02 UTC

We are delaying shipping.
Due to the exorbitant Switzerland/US tariff and high shipping rates, we’re investigating shipping from the EU instead.
Thank you very much for your patience.

2025-08-14 09:59:54 UTC

- reply

The word is not “hunt”.
#SatHunterz
#nevent1q…dch3

2025-08-13 20:33:00 UTC

We're big fans of codex32 at SeedHammer. Hand-computable, built in Shamir's secret splitting and fixes several shortcomings in BIP39 (Ctrl-F "trainwreck" in https://secretcodex32.com/faq/).
The SeedHammer machine may be the first hardware to support codex32. Below is the engraving of 2 codex32 Shamir shares that combine to a master secret.
We also wrote a command line utility and library for manipulating codex32 shares and derive BIP85 data. See https://go.dev/play/p/umS28lD8R0Q (press "Run" to see output) or use a terminal (you need Go installed):
Install the `biptool` command line tool:
$ go install seedhammer.com/cmd/biptool@latest
$ export PATH=$PATH:~/go/bin
Encode a secret with threshold 2. Usually a random key, but in our case a sentence:
$ echo "Codex32 is what we do"| biptool seed -seedlen 22 -id secr -threshold 2
ms12secrsgdhkgetcxvezq6tnypmksct5ypmk2grydu9qqd7chr26ruhsn
Encode share #1:
$ head -c 22 /dev/urandom | biptool seed -seedlen 22 -id secr -threshold 2 -idx a
ms12secras2eph54xt3tkzjhrnp8g8k2zpaq5rrgqzu2sfvvug3l4xxqqc
Derive share #2:
$ biptool interpolate -idx c
# Enter the secret share and share #1, finish with Ctrl-D
ms12secrsgdhkgetcxvezq6tnypmksct5ypmk2grydu9qqd7chr26ruhsn
ms12secras2eph54xt3tkzjhrnp8g8k2zpaq5rrgqzu2sfvvug3l4xxqqc
<Ctrl-D>
ms12secrca5vwy33zw9af9w5jupyvgra6c7ang0ywqugpzm6jm8hhlv035
Now you have two Shamir shares for your secret. Combine them to extract the secret:
$ biptool derive seed
# Enter share #1 and #2, finish with Ctrl-D
ms12secras2eph54xt3tkzjhrnp8g8k2zpaq5rrgqzu2sfvvug3l4xxqqc
ms12secrca5vwy33zw9af9w5jupyvgra6c7ang0ywqugpzm6jm8hhlv035
<Ctrl-D>
Codex32 is what we do
Don't have a terminal? Play along in the browser: https://go.dev/play/p/umS28lD8R0Q . Edit the program, press "Run" and see output below the code box.
#SatHunterz
https://blossom.primal.net/ff7f36f3e4d5270e5cff04c95061f06f7c21e46c72cdb4c300a6a81960d388de.mp4

2025-08-10 18:52:13 UTC

- reply

It might actually work now.

2025-08-10 09:35:15 UTC

Meet our engineer @nprofile…hs2e and come and see the Seedhammer II today at #BH2025 !
He is in the book corner with @nprofile…3hw8, @nprofile…se08 and @nprofile…hg79 ‘s books.
https://blossom.primal.net/9da7c80a6ede61bfc8e047e7b17b348f312d50421346de9a138b4d2d55d8dd3e.jpg
https://blossom.primal.net/bed4004c73af783ed62b26fabd35e70ca7c2ae43683cfacab454a5e0ccd994dc.jpg

2025-08-07 19:09:34 UTC

Here’s our first test engraving of a complete 2-of-3 multisig descriptor. Still a bit off-center, but progress is progress.
We're overhauling descriptor support in the SeedHammer II firmware:
- Seeds and descriptors can be engraved independently.
- Descriptors are engraved in clear text and are no longer split among several plates.
- Descriptors are engraved either text+QR (only singlesig), text only or QR only (your choice).
https://blossom.primal.net/33c4e67eeda24045edd90dc2195ec65ed5e49402eab57bfcfb0d5d5ff8d95075.jpg

2025-07-16 08:04:16 UTC

Any customers who are going to BTCZitadelle next Wednesday: please send us a DM to check the possibility of picking up your order there.

2024-12-29 20:20:20 UTC

Completed a major overhaul of the graphics subsystem of the microcontroller firmware.
Drawing first frame:
Before: 1800 msec (~0.6FPS)
After: 40 msec (~25 FPS)
= 45x speedup.
We expect another 2-3x speedup when switching to the faster rp2350 MCU and use both cores for drawing.
https://m.primal.net/NKnN.mp4

2024-12-21 23:15:23 UTC

Announcing SeedHammer II
Compact, light and operated by builtin touchscreen, this is the machine we wanted when starting SeedHammer.
Preorder here:
- https://geyser.fund/project/seedhammerii (lightning)
- https://seedhammer.com/shop (on-chain)
SeedHammer II is smaller than a 21cm cube and less than 4kg so you can fit it in a backpack. The large LCD and touchscreen eliminate the need for an external controller.
The control board and LCD are designed to be replaced, so you can safely share a SeedHammer II. A replacement kit is $89, comparable to the cost of a manual engraving kit.
The SeedHammer II OG limited edition is for you with the means to support the project. In return we will ship to you 1 of the 21 high-quality machines, and print your name or alias on every control board produced during the fundraiser.
https://m.primal.net/NCsc.mov
https://m.primal.net/NCsi.jpg
https://m.primal.net/NCsj.jpg