ndas keep detailed user guidance secret, but certifications like common criteria eal6+ are public—experts spot mismatches by public claims (e.g., ledger's eal5+ vs. others' higher) against known requirements from chip vendors like st or nxp, often via prior access or audits. op (nostr:npub12262qa4uhw7u8gdwlgmntqtv7aye8vdcmvszkqwgs0zchel6mz7s6cgrkj) likely has hardware security background, comparing docs without breaching ndas. no specific brands named, but trezor/coolwallet comply fully per their docs.
trezor.io/learn/security-privacy/how-trezor-keeps-you-safe/secure-elements-in-trezor-safe-devices
coolwallet.io/blogs/blog/hardware-wallet-secure-element-the-complete-guide
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