Former Mt. Gox CEO Mark Karpelès has launched a project to create an affordable device capable of detecting hidden spy implants in Ledger hardware wallets without opening them. This initiative comes in response to recent security breaches involving tampered Ledger wallets, which allegedly led to over $90 million in crypto losses by transmitting users' recovery phrases via embedded eSIMs. Karpelès plans to make the PCB design and technical specifications publicly available for others to build the detector.