There are several factors that may assure you that the trade history is real, and the entry and exit prices are real and not edited.
The second factor that may assure you that the trade history is real is to check if the options signals issued by a service are autotradable by the major online brokers.
One of the requirements of the autotrading agreement between a signals service and online broker is that the trade history has to match the trades executed by autotrading broker. If at least one options trade reflected in the history differs from the trade executed by autotrading broker and if the broker receives complaints that the signals system returns represented on the web site differs from the actual returns - the autotrading agreement is broken and there is no way that an online broker will auto-trade such signals.
So, if you see that online options signals service could be autotraded you may be sure that the trade history is real and even more that the signals are tradable.
Coming back to our service we may assure you that our trade history is real and there are no back tested trades:
Our signals are autotraded by all major online options brokers (click here to check the list of online brokers that would be glad to autotrade our signals), furthermore, there is no way we may misrepresent our trade history.
Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.