[usrbinbash]

>a currency where taxes are already built into the transfer system

My income tax is automatically deducted from my paycheck, transfer taxes and VAT are automatically taken care of.

> With block chain you don't need permission to access the database

If we are talking about databases now instead of distributed ledgers (aka. cryptocurrencies), then yes I need a permission, because if I store business relevant data somewhere, I need a mechanism to ensure that only authorized parties can access it. This is doable in blockchain-based databases of course but it's much easier in a classic RDBMS or document-store (noSQL) system.

Again, these are solved problems, and "blockchain" provides no benefit over existing solutions, but impacts usability, efficiency, scalabitily and speed.