Coinbook
€99,00
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Coinbook is a steel stamping system for storing critical information permanently - from Bitcoin seed phrases to passwords, recovery codes, or any data that must survive time, disaster, and digital failure. It's a mechanical archive.
Coinbook
A steel backup for seed phrases and recovery codes. Stamp your information into the plates and keep it offline.
€99,00
Currently available for delivery to Germany and the USA only.
Destinations and shipping details. Final rates at checkout.
Step by Step
From blank plates to secure backup.
01
Unbox
Open the box. Everything is packed and ready to go. The only thing you need is a hammer.
02
Prepare the stamps
Empty the box, flip it over, and insert the 35 steel stamps into the QWERTY-labeled holes on the back.
03
Assemble the jig
Place a blank plate on the jig base. Lock the top part into position - pyramids interlock for precise alignment.
04
Stamp & assemble
Stack all 5 plates on the base. Tighten the 4 screws with the included Allen key.
05
Seal it
Thread the Tyvek seal through the slots. Photograph the unique serial number. Any tampering is instantly visible.
06
Mount & hide
Stick the magnetic holder to any wall. The steel base plate snaps right on. Behind a shelf, under a desk - your call.
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See It In Action
Watch. Learn. Build.
Unboxing
Stamping & Assembly
Construction
5 plates. 4 screws. One sealed unit.
Plate Layout
How to store seed phrases.
5 plates. 7 stampable sides. 308 characters of permanent storage.
01
The stamping jig
A precision tool that locks every character into its exact position. The plate sits on a steel ground plate - the jig top snaps into place with interlocking pyramids.
02
12-word seed
Use one side of each plate. 4 words per plate - the word number and up to 8 letters per row. Side B stays blank.
03
24-word seed
Use both sides. Words 1-12 on Side A, words 13-24 on Side B. Every position is numbered - nothing to guess.
04
The jig guides every letter
The windows on the jig top show your exact position - one window for the row (which word), one for the column (which letter). You always know where you are.
05
Middle plates
Use the white numbers on the jig base. Columns 1-2 are for the word position number (01, 02, 03…), columns 1-8 are for the seed phrase word itself.
06
Top plate - your info
This info is readable without breaking the seal - so your Coinbook can be returned to you if found. Rotate the plate 90° and use the second set of numbers on the jig to stamp your name and phone number.
07
5 plates, one stack
1 black base plate (magnetic mount, not stamped) + 3 seed phrase plates + 1 top plate. Held together by 4 screws.
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What's in the Box
What's inside.
Everything to get started - just add a hammer.
Development
Every part. Prototyped by hand.
Each component went through multiple iterations - tested, improved, and refined until it was right.
Stamping Jig
Iteration 01
Iteration 02
Iteration 03
Iteration 04
Iteration 05
Iteration 06
Iteration 07
Final Design
Specifications
The details.
No batteries. No software. No single point of failure.
316L
Marine-grade stainless steel
1,400°C
Melting point
308
Characters capacity
40×40×9mm
Assembled dimensions
90g
Assembled weight
∞
Data retention
A-Z 0-9
Steel stamps included
Built from the ground up.
Thoughtfully engineered products. Built from scratch - one prototype at a time.