About Zcash Incoming Viewing Keys
Unlike other services, we don't require an email address from our users for purposes of communication and password reset (though we can use email for that purpose if you provide us with an address.) Instead, since we require a Zcash incoming viewing key in order to be able to route payments to you anyway, we prefer to use your control of the associated Zcash wallet for things like approving password reset requests.
To obtain a Zcash incoming viewing key for your wallet, at the moment this unfortunately means you're going to need to install and run zcashd directly, rather than use an ordinary consumer-facing wallet as none of them support this feature yet. Please see the zcashd docs page for detailed instructions.