Ethereum validators started rejecting most Tornado Cash transactions

Tornado Cash is under attack again. Most MEV bots do not handle addresses of this service.

Ethereum validators have begun rejecting most transactions related to the Tornado Cash service. As well as addresses on the U.S. Office of Foreign Assets Control (OFAC) sanctions list. So according to the MEV Watch tool from blockchain company Labrys. About 52% of blocks on the Ethereum network are validated through MEV bots that comply with U.S. sanctions. Another 6% of validators use bots that do not enforce sanctions. And about 42% of nodes on the network do not use such programs.

MEV bots are centralized software designed to extract maximum extractable value (MEV). Such software has become popular among validators because it efficiently selects those transactions that can generate the most profit.

MEV Watch shows which bots have been adhering to OFAC sanctions since Ethereum switched to Proof-of-Stake. These bots “discard” blocks with transactions associated with sub-sanctioned addresses. And this leads to an inability to put these transactions into the blockchain, no matter how high the fee would be.

According to platform data, there are currently 7 popular MEV bots. They are: Flashbots, BloXroute Max Profit, BloXroute Ethical, BloXroute Regulated, BlockNative, Manifold and Eden. Of those, only 3 do not censor transactions as required by OFAC. They are: BloXroute Max Profit, BloxRoute Ethical and Manifold.

Remember that on August 8, the U.S. Treasury Department published an update to the sanctions list (SDN). They included Tornado Cash cryptocurrency protocol and associated digital wallet addresses. The reason for blocking was that this service is used by hackers to launder illicit proceeds.

The attack on confidential Tornado Cash service continues. Our experts believe that in the near future the pressure on this service will only grow. We hope that they will be able to withstand all these blows.