How can one be sure, that other manufacturers don’t do the same with their devices?
Discussion
SeedSigner is open source, and you can get individual parts from different manufacturers. That is the gold standard for a trustless Bitcoin hw wallet imo.
Blockstream Jade and Coldcard also have tons of eyes on them at all times. It’s possible other hw wallets have back doors on them, of course, but we *know* Ledger does for sure, as the co-founder has admitted it.