Seattle man gets 5-year sentence for laundering $97M oil-and-gas scam through Bitcoin, Ethereum, and stablecoins

A federal judge sentenced Geoffrey K. Auyeung, 47, of the Seattle area to five years in prison for conspiracy to commit money laundering tied to a sprawling oil-and-gas investment scam. Prosecutors said Auyeung helped move nearly $100 million in victim funds through Bitcoin, Ethereum, and dollar‑backed stablecoins, converting bank wires into crypto and dispersing the assets to co-conspirators.

Authorities arrested Auyeung in 2024. He pleaded guilty in February. From at least 2022 to 2024, victims were told their money would be placed into legitimate oil and gas investments with escrow protections. Instead, once funds hit Auyeung’s accounts, they were pushed to bank accounts controlled by others or routed to crypto exchanges—including Gemini, Bitstamp, and Coinbase—to acquire BTC, ETH, USDT, and USDC. Prosecutors said much of the purchased crypto later landed at Binance, after which victims were cut off from communication.

The money flow was large and fast. Between June 2022 and July 2024, Auyeung’s accounts took in $97.1 million via wires and other deposits that the government believes were fraud proceeds. Prosecutors described a layering strategy: shuffling funds across multiple accounts and entities to blunt scrutiny, then quickly flipping fiat into crypto and fanning it out to deposit addresses supplied by co-conspirators. Auyeung earned at least $4 million in commissions for his role, according to the government. As part of the case, he is forfeiting more than $2.3 million seized from bank accounts at arrest, a vehicle, and $7.1 million taken from crypto wallets.

Prosecutors also said that after indictment and arrest, Auyeung quietly stayed in touch with co-conspirators for roughly 16 months and continued receiving illicit fees by directing them through his wife’s bank accounts—conduct the U.S. Attorney’s Office characterized as showing disregard for court orders.

One element here deserves focus: the use of fully KYC’d centralized exchanges to accelerate laundering. Criminal networks often still choose compliant venues—Gemini, Bitstamp, Coinbase, and even Binance—not because they are blind spots, but because they offer the fastest fiat on-ramps, deep liquidity, and stablecoin rails that clear value globally in minutes. The playbook typically leans on speed and dispersion: convert deposits rapidly, push assets to multiple fresh addresses, and rely on cross-exchange transfers to blur jurisdictional lines. Stablecoins like USDT and USDC make the timing and execution easier by eliminating price volatility risk during the layering phase.

Compliance teams increasingly flag this behavior: high-velocity fiat-to-crypto conversions, a short dwell time before withdrawals, repeat patterns across related accounts, and large outbound transfers concentrated in stablecoins. Blockchain forensics can then stitch together the “fan-out” of addresses and cross-platform hops. That’s likely why significant crypto assets were ultimately seized here; on-chain traceability and exchange subpoenas turn speed into evidence, and the final aggregation at a large venue creates a chokepoint.

The investor side of the story is older than crypto: promises of an escrowed, asset‑backed opportunity in a familiar sector—oil and gas—are designed to lower defenses. The “escrow” language adds a veneer of institutional legitimacy that some victims treat as a substitute for actual custody verification. A simple discipline—confirming the escrow agent is regulated, verifying account ownership, and demanding transaction attestations—would deter a significant share of these flows.

For exchanges, this case echoes common typologies to prioritize in monitoring: - Rapid fiat inflows followed by immediate crypto purchases and withdrawals - Structured movement across multiple personal and business accounts - Concentrated stablecoin transfers to externally supplied deposit addresses - Post-indictment account activity linked to known associates

The enforcement takeaway is not that crypto enables invisibility—it rarely does when centralized platforms and stablecoins are involved. It’s that criminals still exploit the speed and borderlessness of these rails, hoping to outpace controls. Here, the combination of KYC data, banking records, and on-chain analytics appears to have caught up with the scheme, resulting in prison time, multimillion‑dollar forfeitures, and a paper trail that is hard to outrun.