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FastNail: Japan’s discount manicure chain hiding a 21,000-BTC mining empire

Rei Saito's avatar
Rei Saito
Aug 28, 2025
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Have you heard of FastNail? It's a Japanese salon chain that offers ultra-cheap gel manicures to teens, the kind of place teenagers go for a quick beauty fix under 60 minutes.

Sounds ordinary enough, right?

Well, this same company also claims to own a data center and is busy mining Bitcoin. Yes, this is the real strategy of Convano Inc., the Tokyo-based …

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