FBI uses blockchain analysis in darknet opioid case

Federal prosecutors charged two Florida brothers with operating a darknet narcotics operation after investigators combined blockchain tracing with traditional law enforcement methods to identify the alleged vendors behind a series of fatal overdoses.

Vladislav Chernyshov, 35, and Stanislav Chernyshov, 30, both of Jacksonville, were arrested on Aug. 28 and charged with conspiring to distribute nitazenes, according to a Sept. 2 announcement by the U.S. Attorney's Office for the Eastern District of Virginia. The brothers allegedly operated under the vendor name BarbaraWhite across multiple darknet marketplaces.

Blockchain tracing combined with traditional evidence

An FBI affidavit details how investigators used blockchain analysis alongside postal records, undercover purchases, surveillance and darknet marketplace data to build their case. Authorities identified Bitcoin addresses allegedly used by BarbaraWhite to withdraw proceeds from Nemesis, Bohemia and Abacus, three darknet marketplaces that have since been shut down or disappeared.

The wallet network received approximately $220,000 from darknet markets and sent around $230,000 in cryptocurrency, according to a Sept. 8 analysis by Chainalysis that cited the affidavit. The analytics firm noted that total amounts sent can exceed direct marketplace receipts because wallets may receive funds from other sources, transfer the same funds through several addresses or contain balances acquired before the monitoring period.

Investigators allegedly linked the wallet activity to Stanislav by identifying transactions involving other wallets connected to his mobile payment account. Chainalysis said investigators used its Reactor software to reconstruct part of the transaction network, though the court record itself forms the evidentiary basis for prosecution.

The traced wallets allegedly sent money to a postage provider, another drug vendor and a China-based chemical supplier, with approximately $7,210 reaching the supplier, according to Chainalysis's account of the affidavit.

From fatal overdose to federal charges

The investigation began after a fatal overdose in Arlington, Virginia. The victim died on Aug. 28, 2023, four days after receiving a parcel connected to a BarbaraWhite purchase, according to local reporting based on the affidavit.

Prosecutors allege that BarbaraWhite sold counterfeit oxycodone pills containing several nitazenes, including protonitazene, metonitazene, N-pyrrolidino etonitazene and N-pyrrolidino isotonitazene. The pills carried markings designed to resemble pharmaceutical oxycodone. Some listings described them as "fent free," but laboratory tests allegedly found nitazenes that can match or exceed fentanyl's potency.

Chainalysis said investigators associated BarbaraWhite shipments with at least 12 overdoses across the U.S., including three fatalities. Records from three marketplaces allegedly showed sales exceeding 95,000 counterfeit pills.

Each defendant faces a maximum penalty of at least 20 years in prison if convicted. The defendants retain the presumption of innocence, and the criminal complaint remains an accusation. No trial date or plea agreement had been announced publicly at the time of reporting.