Wear the diamond within every sat

RareSats, developed by Fumiha Co., Ltd., is a display and showcase application for rare satoshis. It is purpose-built for collectors who want to wear, browse, and present the satoshis they already own — through Apple Watch faces, an Apple Watch app, a themed iPhone gallery, and creative export.

Identification is performed from public on-chain data using a public Bitcoin address or a sat number that you choose to add. All classification, gallery rendering, watch-face composition, and creative export run locally on your device.

We follow strict data-minimization principles: no advertising SDKs, no cross-app tracking, and no upload of your collection details.

Fumiha Co., Ltd. is the company that operates RareSats. We uphold a product philosophy of data minimization, on-device processing, and uncompromising user experience.

RareSats is engineered around a small set of principles:

• Public on-chain data only — a public address or sat number is all the app needs
• On-device classification, rendering, and creative export
• No advertising SDKs and no cross-app tracking
• Apple Watch faces and creative exports include only public sat metadata
• Optional anonymized diagnostics that you can disable in Settings

RareSats provides a focused suite of showcase tools:

• Curated Apple Watch faces for individual rare sats
• A native Apple Watch app to browse and switch your collection from the wrist
• Automatic rare-sat identification across 20+ satribute classifications
• A themed iPhone gallery with three curated palettes
• Creative export — wallpapers, posters, social cards rendered locally

We believe that each satoshi carries a unique, discoverable, and expressive form of scarcity. Fumiha Co., Ltd. is committed to long-term engineering excellence so collectors have a calm, trustworthy place to wear and display the rarest assets on Bitcoin.

“Wear the diamond within every sat.”