0xc6d69a30?0xc6d69a30 is the function selector for setTaxRate(uint256). Changes a transfer tax rate.
When a transaction's data begins with 0xc6d69a30, it is calling setTaxRate. The selector is the first four bytes of the keccak-256 hash of the signature setTaxRate(uint256), which is how wallets and explorers work out which function a payload is for.