Why Just Holding Cryptocurrency Will Change the World   Cryptocurrency, digital assets run by blockchain distributed ledger technology, have some pretty revolutionary features and use cases. They can cheaply and permanently send wealth faster than anything else. They can cryptographically prove your identity. They can run self-executing smart contracts instead of relying on an enforcement mechanism when people don’t keep to their deals. But what if I told you that one of the most world-changing things about digital currencies is…