0xe9e05c42?0xe9e05c42 is the function selector for depositTransaction(address,uint256,uint64,bool,bytes). Bridges a deposit to an L2.
When a transaction's data begins with 0xe9e05c42, it is calling depositTransaction. The selector is the first four bytes of the keccak-256 hash of the signature depositTransaction(address,uint256,uint64,bool,bytes), which is how wallets and explorers work out which function a payload is for.