People care about privacy, and more are willing to pay for it. There is a massive opportunity for direct monetization through cryptocurrency users, and the things you could build when this problem is solved...
As someone who uses cryptography daily (and not for crypto currency), I would kill for that.
The problem is that it's really hard to build good abstractions. You can't get the math to do things that the math doesn't do, so the complexity comes from (1) preventing people from mathematically shooting themselves in the foot, and (2) twisting the math into something that approximates real world problems.
We all want to be able to say "here is cryptographic magic that tells you that this data is trustworthy", but trust is fundamentally a human problem. Cryptography ultimately allows humans to make and move around declarations of fact, but how you glue those facts together is messy because humans are kind of bad at saying what they mean and meaning what they say.
iPhone-level UX for private key management.
People care about privacy, and more are willing to pay for it. There is a massive opportunity for direct monetization through cryptocurrency users, and the things you could build when this problem is solved...