Interesting context:

"Snowden suggested a similar concept of Tor, where bitcoin transactions are “tumbled” and changed once it is sent, like DASH’s Darksend. Darksend mixes a pool of transactions and its addresses randomly, making the transactions completely anonymous and untraceable.

The anonymity of DASH allows users to have multiple “persona” – “a common persona, an anonymous persona, a shared persona” to send transactions that cannot be tracked by the NSA or any government agencies."

Edward Snowden on Bitcoin: “Bitcoin By Itself is Flawed”
http://cointelegraph.com/news/115133/edward-snowden-on-bitcoin-bitcoin-by-itself-is-flawed