seedhammer
SeedHammer

Second generation engraving machine for bitcoin backups.

Public Key

npub1z072s0nvldeva7a6qek3kj358f0h5gm640kkllkk52h0qrjtnw8q38wfm4

NIP-05 Address

Profile Code

nprofile1qqsp8l9g8ek0kukwlwaqvmgmfg6r5hm6yda2hmt0lmt29thspe9ehrspzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhgqg5waehxw309aex2mrp0yhxgctdw4eju6t0yu3gag

Publishing to

relay.primal.net

relay.damus.io

Author Public Key

npub1z072s0nvldeva7a6qek3kj358f0h5gm640kkllkk52h0qrjtnw8q38wfm4

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Last Notes

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

2025-10-22 09:47:27 UTC

Shipping status:
- We are assembling additional machines for the upcoming shipment batch.
- We are investigating defective hammerheads supplied by the factory.
- We’re also working on CE certification to get through EU customs.

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

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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

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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

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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

2025-08-06 18:02:35 UTC

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It’s the 5-pack plate option listed on our website. When your order is ready to ship, you’ll be able to choose whether you want the plates with or without holes.

2025-08-06 17:54:40 UTC

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You will still be buy to by SH02 plates.

2025-08-06 17:42:47 UTC

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Yes.

2025-08-06 17:18:20 UTC

Delivered 5 machines in July. More going out soon.
If you've placed an order:
📦 We’re delivering in the order received (first in, first out)
⏳ No exact delivery dates yet
You’ll get an email when your order’s up - with a link to confirm shipping details and pay for delivery.
Appreciate your patience!
https://blossom.primal.net/7099799bf826e62fe3a45aecc9e40dd2e862f81f2ae2cadea176e23576680300.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.

2025-06-19 08:30:17 UTC

Join us at our booth at @npub167n…zu3r where we show off the SeedHammer II and how easy it is to engrave a seed through a NFC device such as a @nprofile…wttc wallet Q or Mk4.
All orders will receive a 5% discount in the @npub12ct…c5ky store.
https://blossom.primal.net/c58720f94a0fbddee1f1cfc220ba8c3b8e3a743cb0a8fb63f0df07dd42e62522.mov

2025-05-08 15:14:03 UTC

As promised, we're open sourcing the SeedHammer II hardware design files:
https://github.com/seedhammer/hardware
This includes the CAD STEP files as well as PCB schematics and layout in KiCad format.
Enjoy! And let us know if you find any mistakes as we move to production.
https://blossom.primal.net/5d103393414c09388ca3dee8612e84679153188c113c17c678a454c1b1eb6d94.jpg https://blossom.primal.net/2d36560e279192f132133eaaf9cf21511b64cee78c5b67e9b73cc288778f1b90.jpg https://blossom.primal.net/3e65dad55c1d9fab56cc7253d910357f50938a0c0e5cd45909e92345521918d0.png

2025-05-06 12:14:21 UTC

PSA: We're moving the official SeedHammer community group chat to Signal.
Join us here: https://signal.group/#CjQKIArvsDmiLDuUXsIFXsNFUa8mbElkGBjDSJghbuJk3Xe_EhB0bOzBoKCgOSF-HgCc8NIW

2025-03-26 18:00:46 UTC

Going live with Geyser Weekly on X Spaces tomorrow at 1PM EST. Don’t miss it 🔥
https://x.com/i/spaces/1BdGYqbPoOYGX

2025-02-28 08:58:05 UTC

We're in the process of producing a larger batch of SH02 plates (with mounting holes for the original machine).
If you want any, please DM so we include your plates in the batch.

2025-01-28 09:11:08 UTC

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Direct support is not planned. However, we will add a feature to engrave arbitrary data.

2025-01-28 09:03:50 UTC

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https://m.primal.net/OEEM.png

2025-01-28 09:02:44 UTC

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Each machine includes a Raspberry Pi rp2350 microcontroller. The same as in the Pico2.

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

2024-12-25 22:31:54 UTC

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Lovely update from our engineer, casually creating the FrankenHammer while waiting for functional electronics and firmware.
#note1dmq…afqq

2024-12-23 09:13:45 UTC

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Unless you never spend (or test) your wallet, you'll need *some* tools that require *some* trust. E.g. signing devices.

2024-12-21 23:23:03 UTC

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Thanks! Nostr announcement here:
https://njump.me/nevent1qqsq5dlje82pascfefn7gmrfntk75c3htzrs6meeh69g9553qm337lqpzemhxue69uhhyetvv9ujumn0wd68ytnzv9hxgq3qz072s0nvldeva7a6qek3kj358f0h5gm640kkllkk52h0qrjtnw8qdsws70

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