On April 27, 2024, the cryptocurrency community witnessed the closure of OXT, a blockchain analysis platform that had long served as a free tool for Bitcoin privacy research. Acquired by the Samourai Wallet team in December 2017, OXT's servers were taken offline shortly after U.S. federal prosecutors indicted Samourai's two co-founders on charges of money laundering and operating an unlicensed money transmitting business. Laurentmt, co-founder of OXT, announced the shutdown on social platform X with a succinct epitaph: “RIP OXT.”
From Acquisition to Shutdown
In December 2017, the team behind the privacy-oriented Bitcoin wallet Samourai announced they had purchased the OXT blockchain explorer. At the time, the Samourai team stated they were “very proud” to have “successfully outmaneuvered a known adversarial chain analysis company” to secure the property as a freely available public resource, democratizing access to analysis software.
Six and a half years later, the U.S. Attorney for the Southern District of New York, Damian Williams, alleged that Samourai’s founders “knowingly facilitated the laundering of over $100 million of criminal proceeds” and indicted them on charges of money laundering and unlicensed money transmission. In the aftermath, all online platforms linked to Samourai Wallet became inaccessible to the public, including the blog where the team once celebrated the OXT acquisition. Laurentmt responded to inquiries about a possible revival by stating, “It seems that servers have been taken down.” He later shared an archived list of OXT research posts, but the platform itself is permanently offline.
The Value of OXT: A Guardian of On-Chain Privacy
Unlike mainstream blockchain explorers, OXT specialized in Bitcoin privacy analysis and maintained extensive annotations for addresses that traditional explorers had not flagged. Researchers used OXT to identify specific transactions linked to well-known hacks, breaches, and to publish literature concerning BTC privacy. The crypto community widely regards the loss of OXT not merely as a tool disappearance but as a severe blow to the cryptocurrency privacy research ecosystem.
The Regulatory vs. Privacy Battle
The fate of Samourai Wallet itself continues to stir debate. Prosecutors argue the wallet was widely used for darknet market transactions and money laundering, but privacy advocates counter that the indictment is “weak, riddled with errors” and represents an outright intrusion on financial privacy. The closure of OXT is seen as a landmark event in U.S. law enforcement’s crackdown on cryptocurrency privacy tools, highlighting the escalating tension between regulatory authorities and privacy defenders.
As of now, all Samourai-related online platforms remain inaccessible, including the 2017 blog post announcing the OXT acquisition. The story that began with a proud acquisition ended with servers seized, leaving the community with deep concerns about the future of on-chain privacy.