TIL: cryptocurreny hardware wallets must have dedicated button to confirm transactions, different to navigation buttons.
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Or a touchscreen like the Trezor Model T. That's nice since it allows on-device passphrase entry and much more convenient secure recovery rather than their advanced recovery approach for the Trezor One. It would be even nicer with a much bigger touchscreen or even a keyboard.
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Lots of devices claim to be secure hardware wallets but are nothing more than an HSM without the proper security model. That applies to a lot of the cryptocurrency phones in particular. They mostly add secp256k1 support to the TEE-based keystore and call that a hardware wallet.
Even if the Pixel 3 StrongBox keystore implementation via the Titan M had secp256k1 support, it's missing a secure display. It has actual physical confirmation but reuses physical buttons used for other purposes. Not a real hardware wallet without proper transaction confirmation.
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