Check :another device with closed-source firmware? that's a no go
Keystone Wallet | Secure Open Source Crypto Solution
Keystone is the trusted open-source hardware wallet for secure crypto storage. Protect Bitcoin, Ethereum, XRP & more. Official MetaMask partner.
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Keystone - Hardware Wallet for Zcash - Least Authority
A security audit of the Keystone Hardware Wallet, which supports Zcash users managing their assets.
