SeedSigner
Air-gapped Bitcoin signing devices: SeedSigner+, Rugged Pill, OpenPill and aluminium cases, plus DIY kits. Open-source hardware that keeps your keys offline for good.
SeedSigner, backups & more — printed and assembled in Germany; we also ship to the UK, Switzerland and Norway. Pay with Bitcoin — Lightning or on-chain (7 % discount).
Air-gapped Bitcoin signing devices: SeedSigner+, Rugged Pill, OpenPill and aluminium cases, plus DIY kits. Open-source hardware that keeps your keys offline for good.
Off-grid communication over LoRa radio: nodes, cases and accessories from the 3D printer. Text messages without internet, without a SIM card, without infrastructure.
Hardware signers for Nostr: your keys stay on the device, nothing is signed without a button press. From the USB stick for daily posting to air-gapped QR variants.
Seed backups in steel instead of paper: BlockMIT, Washer Stack Box and punch guide for M8 washers. Fireproof, waterproof — built for the next decades.
The Bitcoin shopping cart chip: fits every supermarket trolley and starts conversations at the checkout. Orange-pilling in everyday life.
The piggy bank that lives on Lightning: sats arrive over the network and show up right on the display. Flash it in the browser, connect it to LNbits, start stacking.
Block height, price and more at a glance: the little Bitcoin clock for your desk. Wi-Fi, USB-powered, always on Bitcoin time.
45 minutes one-on-one via video call: SeedSigner setup, self-custody questions, backups or 3D printing. You bring the questions, we sort them out together.
Because Bitcoin cuts out the middlemen. No card networks, no payment processors, no chargeback insurance — a Bitcoin payment goes straight from your wallet to our own BTCPay node. What the middlemen don't take, you keep: 7 % off everything, shipping included.
We accept Lightning — instant, fees of a few sats — and classic on-chain payments; you pick in the checkout. The discount is applied automatically — you'll see both prices right on every product.
Never paid with Bitcoin before? This order is the perfect first time: grab a Lightning wallet (Phoenix, Breez, Blink …), load a few sats, done. Stuck? service@21drucker.farm — the guy answers.
Lightning is the fast lane: paid in seconds, fees of a few sats — perfect for shop orders. On-chain is the classic way: a normal Bitcoin transaction straight to our own node — give it a little time to confirm, depending on network fees.
You pick whichever you like right in the checkout — both run over our own BTCPay server, no middlemen, and both get the 7 % discount.
Behind this shop there is no ticket system, no chatbot, no support department — just the one guy who prints, assembles and packs your order. Write to service@21drucker.farm and the answer comes straight from the workshop, usually within 24 hours — often much faster, unless a printer is on fire.
Whatever it is — a question before you order, a problem after, a wild idea for a custom print: just write. Add your order number if you have one, it saves a round trip.
And if 24 hours pass in silence: nudge again. Emails sometimes get lost — customers never.