Could a Trezor sign a sheilded transaction?

Obviously proof generation needs to be done by a capable laptop / desktop but is the transaction signing that the private key is needed for any different to the transparent transactions that the Trezor can already do?

the ability to do this is under development, its all the "proof offloading" tickets in github, at least the part of it that needs to be implemented in zcashd. I believe the proof of concept client is a javascript library to interact with the server doing the proof generation, which is then later signed by the light weight client.

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