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How to securely derive a second password specific to an user

I'm giving each of my users an unique Blocktrail wallet that is protected by two API keys (which the server knows) and one passphrase (unique to each wallet). I want the wallet's passphrase to be ...
2
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Let users sign in with eIDs - do I need government authorisation? (scope: all nation-states)

I've decided to launch a crypto-basic income system. Crypto UBIs are pretty popular now. For me, it seems like an open nation-state ID should exist by now (2015). However, Mike Hearn, Bitcoin ...