When your company’s bread-and-butter is selling crypto devices advertised as having “industry leading” security, you better keep a close eye on your supply chain.

That’s a hard lesson learned by Ledger, a company specializing in secure blockchain wallets, after news broke that some of its devices had been infiltrated by a mysterious “hardware implant.” According to Bleeping Computer, the malicious implant was designed to monitor inputs made onto each wallet via on-board buttons, along with changes in output on the devices’ e-ink screens.

By monitoring this data, the…