We previously reported that, in July 2019, the IRS announced that it had begun sending the now infamous letters to taxpayers who, supposedly, may have failed to properly report income and pay taxes associated with cryptocurrency transactions.  About 10,000 of these Letter 6173 were sent.  On tax day (July 15 this year) the IRS was sued in connection with these letters.

The complaint alleges that Plaintiff James Harper opened an account with Coinbase in 2013.  Harper claims he disclosed and paid taxes on his digital currency holdings. The complaint describes the process by which the IRS obtained customer information from Coinbase, which was supposedly the basis for the IRS letters.  Harper is claiming the IRS violated his rights under the Fourth and Fifth Amendments of the U.S. Constitution by demanding his information from third parties without any specific suspicion of wrongdoing and doing so without notifying him or allowing for him to challenge the seizure of such property.

The complaint begins by saying as follows: “The Framers of the Constitution would hardly recognize the unbridled power that the Internal Revenue Service regularly exerts to seize innocent Americans’ private financial information. . . This case presents the opportunity to correct the course of constitutional law.”  Harper seeks money damages and declaratory and injunctive relief, including an order expunging Mr. Harper’s private financial information from IRS’s records. Earlier this month we reported that the Fifth Circuit Court of Appeals held that an individual did not have a privacy interest in the records of his Bitcoin transactions on Coinbase.

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David Zaslowsky is partner in the Litigation Department of Baker McKenzie's New York office. He helps companies solve complex commercial disputes in arbitration and litigation, especially those involving cross-border issues and Section 1782 discovery. David has a degree in computer science and, as a result, has worked on numerous technical-related disputes, including, most recently, those involving blockchain and artificial intelligence. In April 2025, Attorney Intel named David one of the top 25 blockchain lawyers in the country. He is the editor of the Firm's blockchain blog and co-editor of the firm's International Litigation & Arbitration Newsletter. David has been included for a number of years in the Chambers USA Guide and Chambers Global Guide for his expertise in international arbitration. He also sits as an arbitrator and is on the roster of arbitrators for a number of arbitral institutions. David sits on the Board and chairs the governance committee of the New York International Arbitration Center, and is a founding member of the International Arbitration Club of New York. For over 35 years, he has written and spoken often on the subjects of arbitration and international litigation.