http://www.coindesk.com/boston-fed-bullish-bitcoin/
as a technology…what about as a currency?
Yeah, great technology. Will have a few million blockchains in 5 years for all kinds of record keeping. Would Bitcoin be amongst them? Possibly? As a currency? Probably not.
Bitcoin is only the first instance of a great technology that is the block chain.
In http://www.bankofengland.co.uk/research/Documents/onebank/discussion.pdf
"The emergence of private digital currencies (such as Bitcoin) has shown that it is possible to transfer value securely without a trusted third party. While existing private digital currencies have economic flaws which make them volatile 2), the distributed ledger technology 1) that their payment systems rely on may have considerable promise. "
Nu is based on 1) and solves 2)
Refer that to William J. Luther