0x2e1a7d4d?0x2e1a7d4d is the function selector for withdraw(uint256). Unwraps a token back into native currency.
When a transaction's data begins with 0x2e1a7d4d, it is calling withdraw. The selector is the first four bytes of the keccak-256 hash of the signature withdraw(uint256), which is how wallets and explorers work out which function a payload is for.