Arcitrum development team Offchain Labs will launch a defense mechanism against sequencer witch attacks

On February 27, the Arcitrum development team Offchain Labs is developing a defense mechanism entitled “Add random number of relay client connections” to prevent MEV searchers from witching attacks on sequencers. This mechanism requires that the random number must be unique among different clients. The relay will broadcast messages to clients in the order of the target value of the random number from high to low, and the client with the highest target value of the random number will receive the message as soon as possible. If the target value of the random number of two connections is the same, then the client with a lower hash value will receive the broadcast first, and then propagate it to other relays.

Interpretation of this information:

The development team of Offchain Labs is introducing a defense mechanism called “Add random number of relay client connections” that aims to prevent MEV searchers from performing witching attacks on sequencers. This mechanism requires unique random numbers for different clients, and relays will broadcast messages to clients in order of the target value of the random number from high to low. The client with the highest target value of the random number will receive the message first. In case of identical target values, the client with a lower hash value will receive the broadcast first.

In the blockchain world, MEV or miner-extractable value, refers to the potential profit that a miner can extract from the blockchain through various means. However, MEV searchers can use malicious tactics to extract value from other participants in the blockchain. The defense mechanism developed by Offchain Labs aims to prevent such attacks, especially on sequencers, which are responsible for placing transactions in blocks.

The mechanism requires a random number of relay client connections, which must be unique for different clients. The relay will then broadcast messages to clients in order of the target value of the random number, ensuring that the client with the highest target value receives the message first. This approach prevents MEV searchers from performing witching attacks, and it ensures that transactions are placed in blocks in a fair manner.

In summary, the Offchain Labs development team is introducing a defense mechanism to prevent MEV searchers from performing witching attacks on sequencers. The mechanism requires unique random numbers for different clients, and messages are broadcast to clients in order of the target value of the random number from high to low. The client with the highest target value of the random number will receive the message first, and in case of identical target values, the client with a lower hash value will receive the broadcast first. The three keywords that summarize the content are defense mechanism, MEV searchers, and random number.