What are the chances that one of the major hardware wallet manufacturers has a backdoor just like this?
Multi-signature schemes can protect against this, but it still concerns me.
Yep, that's why it's best to multi-sig with multiple manufacturers. A quorum would need to be compromised and collude to rob you.
backdoor just like this
This backdoor is really naive. If there's a backdoor in a major hardware hardware wallet, it's likely some kind of deterministic entropy.
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