0x081812fc?0x081812fc is the function selector for getApproved(uint256). Reads the approved address for a token. Read-only.
When a transaction's data begins with 0x081812fc, it is calling getApproved. The selector is the first four bytes of the keccak-256 hash of the signature getApproved(uint256), which is how wallets and explorers work out which function a payload is for.