We all knew it would be just a matter of time. IRS now has legal authority to rip apart cryptocurrency transactions.
Head's-up, people.
https://www.justice.gov/opa/pr/court-authorizes-service-john-doe-summons-seeking-identities-us-taxpayers-who-have-used
FYI: Top 3 Untraceable Cryptocurrencies: Monero, Dash, Zcash.