0x1f0464d1?0x1f0464d1 is the function selector for multicall(bytes32,bytes[]). Runs several calls with a previous-block guard.
When a transaction's data begins with 0x1f0464d1, it is calling multicall. The selector is the first four bytes of the keccak-256 hash of the signature multicall(bytes32,bytes[]), which is how wallets and explorers work out which function a payload is for.