One man's battle with the IRS over Bitcoin privacy-
[reason.com]

What kinds of information should taxpayers be expected to share with the government during an audit? Pay stubs? Receipts? Bank statements? What about bank statements for transactions that haven't occurred yet? Should the Internal Revenue Service (IRS) be able to monitor a taxpayer's finances indefinitely?

That's what the agency is effectively asking of bitcoin user William Zietzke, who was audited after amending his 2016 tax return. Citing a lack of cooperation on his part, the IRS issued summons to Zietzke and cryptocurrency exchanges Coinbase and Bitstamp for information that, by its nature, allows for the continued surveillance of his cryptocurrency finances. Zietzke is fighting these summons, insisting that they are unnecessary, are unwarranted, and violate the Fourth Amendment. The results could affect thousands of bitcoin users.