Mt. Gox ex-CEO Mark Karpelès developing device to detect spy implants in Ledger wallets

The signal here is less about the device than about who is building it and how: an open PCB design aimed at a supply-chain threat that hardware-wallet users cannot easily verify themselves. Karpelès's Mt. Gox history will draw scrutiny, but publishing build specs shifts the burden of proof to the community rather than a vendor. The practical question is whether an open, low-cost detector gains independent validation and adoption among self-custody users, and whether hardware-wallet makers respond with their own tamper-verification claims.