ZkSNACKs is shutting down its coin mixing service, beginning June 1.

CoinJoin is shutting down amid mounting pressures from law enforcement, as U.S. regulators and authorities crack down on privacy tools. The shutdown comes shortly after authorities arrested the co-founders of Samurai Wallet, which offered CoinJoin’s mixing services to its users.

So-called coin mixers obfuscate the origins and destinations of crypto transactions, making it difficult for international authorities to identify dark money laundering.

ZkSNACKs' shuttering of CoinJoin follows other moves the project has taken to limit its legal liabilities stateside. Last week, ZkSNACKs blocked access to its Wasabi Wallet for U.S. citizens and residents.

Crypto firms’ sunsetting of legally ambiguous products in the U.S. …