It doesn't include any proprietary software and the whole thing is an open design that other people are able to build (and have successfully done so in practice). The primary purpose is for cryptocurrency wallets but it works well for U2F, GPG, SSH and various other purposes too.
The Trezor hardware isn't what's compelling about it. It's just a standard embedded computer with secure boot and a tamper evident case. I'd like to see more implementations that are fully compatible with not just the cryptocurrency wallet aspect but also SSH, GPG, U2F, etc.
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I think they have by far the best approach to this on the Trezor Model T and I'd really like to see alternate implementations with different trade-offs like having a secure element for storing the seed and doing cryptographic operations at the expense of openness and flexibility.
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Ideally, there would be a much more tamper resistant general purpose SoC available so it wouldn't need to be a compromise. They do have basic tamper resistance already but it would be good to have lower-level support from the SoC like memory encrypted with a hardware key, etc.
End of conversation
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