I have. Keystone has 3 types of firmware available. One for BTC + DeFi shitcoins, one for BTC + XMR + ZEC, and one for BTC only. If you want to use privacy coins and also play with the DeFi, you’re shit out of luck, unless you don’t mind spending 10+ minutes flashing a new firmware every time you want to use one or the other. The hardware itself is secure (audited by the best of the best AFAIK) and has some nice features that the competition lacks, such as the ability to store up to 3 different seeds. This would solve my problem of not having to travel with multiple Trezors IF there was a firmware that supported all crypto I’m interested in, instead of separating it by use case into its own set of firmwares. The Zcash integration with Zashi still needs some work. Zashi only supports a single transparent address, so you need to reuse it before you can shield your coins, which somewhat nukes your previous privacy. Also, you don’t really know whether you’ve correctly imported your Keystone wallet into Zashi because there is no way to confirm the generated Zashi addresses with Keystone. Overall, I’m hopeful for the future but I can’t recommend this setup to anyone yet.

Are there any videos on how Cashu’s nut-21 is supposed to work on the wallet side? I set up authentication for my mint via Ory Hydra, but I can’t test my setup because I have no idea how to auth a user. Is the wallet supposed to redirect user to the auth page automatically? Is the user supposed to do something? I wasn’t able to find any info apart from the nut-21 spec, which isn’t really helping. I’d be okay hiding the mint behind Tailscale and adding the mint users to my Tailscale network too. However, Nutshell mint has some issues with HTTP requests over Tailscale so I can’t even connect my wallet to it.