Open source. Download the complete Coinbook 3D model and inspect every part.
A small studio. Thoughtfully engineered products. Built from scratch — one prototype at a time.
The story behind ›Rau Studio designs and manufactures physical products built for permanence. Every product starts as a real problem — and becomes a precisely engineered solution. Our first product, Coinbook, is an indestructible stainless steel storage system for Bitcoin seed phrases, passwords, and critical data. Made from marine-grade 316L steel with a melting point of 1,400°C, it's designed to outlast hard drives, cloud services, and paper backups.
Digital storage fails. Hard drives crash, cloud accounts get hacked, paper burns. For information that truly matters — cryptocurrency keys, recovery codes, legal documents — you need something that survives fire, water, and time. Coinbook uses precision steel stamping to permanently engrave data into stainless steel plates. No batteries, no software, no single point of failure. Just steel and the information you choose to protect.
