Arbitrum DAO Treasury transfers $21.06M worth of ARB to anonymous multisig address

On-chain analyst @ai_9684xtpa reported on X that the Arbitrum DAO Treasury transferred 26 million ARB ($21.06 million) to a multisig address starting with 0xAc2 about four hours ago. This address had previously received 4 million ARB from the treasury and later deposited 1.75 million ARB into Coinbase Exchange a month ago.