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A federal appeals panel on Wednesday sharply questioned the Department of Justice's venue theory in the Bitcoin Fog prosecution, probing whether a small number of undercover transactions conducted in the District of Columbia were enough to anchor a global crypto-mixing case to a single federal district.
Why it matters
Roman Sterlingov was convicted in 2024 of operating Bitcoin Fog, one of the longest-running darknet mixing services on record, after a jury found he laundered more than $400 million in criminal proceeds over a decade. The case has become a stress test for how aggressively U.S. prosecutors can reach across borders to assert jurisdiction over crypto infrastructure that is global in operation but anchored to a single U.S. district on paper.
What the court scrutinized
Beyond venue, the panel also pressed the government on the reliability of its "IP overlap" analysis — the technique used to link Sterlingov to the Bitcoin Fog service via overlapping IP and cryptocurrency addresses. Defense counsel has argued the methodology is statistically untested and prone to false positives, an issue that has drawn attention from cryptography researchers and privacy advocates since trial.
The appellate questioning signals skepticism on at least two fronts: whether the geographic hook into D.C. is sufficient, and whether the technical evidence underpinning the conviction can survive scrutiny. A ruling against the government could narrow the playbook federal prosecutors have used to bring mixing and laundering cases inside D.C. as a matter of convenience rather than connection.
Frequently asked questions
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What is the Bitcoin Fog case about?
Roman Sterlingov was convicted in 2024 of operating Bitcoin Fog, a darknet cryptocurrency mixing service that prosecutors say laundered more than $400 million in criminal proceeds over roughly a decade.
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Why is the appeal testing DOJ's venue theory?
Federal prosecutors built the case in the District of Columbia, but judges on Wednesday pressed them on whether a small number of undercover D.C. transactions were enough to establish venue for a global crypto-mixing operation.
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What is the "IP overlap" analysis the court scrutinized?
It is the methodology the government used to link Sterlingov to the Bitcoin Fog service by matching overlapping IP addresses and cryptocurrency addresses. Defense counsel argues the technique is statistically untested and prone to false positives.
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Who is Roman Sterlingov?
Sterlingov is the alleged operator of Bitcoin Fog, a long-running darknet mixing service. He was convicted in 2024 and is now appealing that conviction before a federal appellate panel.
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What happens if the court rules against the DOJ?
A ruling against the government could narrow how federal prosecutors bring cross-border crypto-mixing and laundering cases, potentially forcing a retrial in Bitcoin Fog or pushing future cases to file in districts with stronger geographic ties to the underlying conduct.
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