0x8f70ccf7?0x8f70ccf7 is the function selector for setTrading(bool). Enables or disables trading.
When a transaction's data begins with 0x8f70ccf7, it is calling setTrading. The selector is the first four bytes of the keccak-256 hash of the signature setTrading(bool), which is how wallets and explorers work out which function a payload is for.