A Bitcoin wallet built for rare sats

Eureka Wallet, developed by Fumiha Co., Ltd., is a non-custodial Bitcoin wallet and rare-asset management platform purpose-built for the emerging Rare Sats ecosystem. Grounded in true self-custody with locally generated private keys, Eureka delivers a full lifecycle experience—from rarity detection to valuation, provenance certification, intelligent UTXO management, and market aggregation—enabling users to seamlessly move from discovery to transaction.

Eureka follows strict data-minimization and privacy-first principles: we never store private keys, seed phrases, or sensitive metadata. All signatures and cryptographic operations are executed locally on the user's device.

Our vision is to give the smallest unit of Bitcoin a visible expression of scarcity and value—connecting collectors, creators, researchers, and market liquidity within a unified platform.

Fumiha Co., Ltd. was founded by senior engineers, product managers, and security specialists from top Internet companies such as ByteDance and Alibaba. As the core R&D team behind Eureka, we uphold a product philosophy of self-custody, data minimization, and uncompromising user experience.

We build high-security, high-performance wallet infrastructure across the entire Rare Sats value chain: identification → valuation → curation → circulation.

This allows us to maintain a fully self-owned technology stack—from the indexing engine and wallet core to the front-end experience.

We enforce:

• local private-key generation and storage
• end-to-end encrypted communication
• least-privilege access controls
• verifiable, transparent signing workflows

These are supported by rigorous code audits, penetration testing, and a dedicated incident-response program.

We also monitor multi-jurisdictional regulatory developments and continuously refine our risk-control and compliance guidelines—empowering users to manage digital assets in a transparent, resilient environment.

Eureka provides a comprehensive suite of rare-asset tools:

• Automatic rarity detection
• Valuation engine and pricing models
• Eureka Certificate™ (rarity provenance)
• Intelligent UTXO splitting & merging
• Market aggregation for liquidity discovery

These capabilities serve collectors, researchers, active traders, and institutional-grade users.

We believe that each satoshi carries a unique, discoverable, and expressive form of scarcity. Fumiha Co., Ltd. is committed to long-term engineering excellence—continuing to invest in core indexing, data standards, and open APIs.

Together with ecosystem partners, we aim to build a trustworthy and thriving market for Bitcoin's rarest assets, enabling more users to:

“Discover the diamond within every sat.”