# Karpelès Develops Tool to Scan Closed Hardware Wallets for Hidden LTE Antennas By Simon Yoon Canonical URL: https://www.tokenpost.com/news/technology/34415 Published: 2026-10-18T15:34:57.000Z Updated: 2026-10-18T15:34:57.000Z Section: Technology > The concept uses a faint radio signal and resonance measurements to flag a possible antenna. A prototype is expected in the coming weeks. Former Mt. Gox CEO Mark Karpelès is developing a low-cost device to scan closed hardware wallets for hidden LTE antennas associated with supply-chain attacks, without opening them. The concept would send a faint radio signal and measure the wallet’s resonant frequency to flag a possible antenna. The check is designed to detect the hardware while the wallet remains closed. Karpelès previously described finding a Ledger device with a module wired to the screen’s data line, LTE/eSIM hardware and an antenna. The setup may have captured recovery words displayed on the screen and sent them over cellular networks, as detailed in [an earlier examination of a tampered Ledger device](). He also published [a catalog of 14 Ledger devices classified as tampered or counterfeit](), including modified units with added circuitry. The project is still at the concept stage. Karpelès plans to publish the circuit-board design and specifications so others can build the device, with a prototype expected in the coming weeks. ## Links in this article - [an earlier examination of a tampered Ledger device](https://www.tokenpost.com/news/technology/33884) - [a catalog of 14 Ledger devices classified as tampered or counterfeit](https://www.tokenpost.com/news/technology/32156)