The image shared by OP was 2 Digits, the same concept used in
"jueteng". Swertres or 3 Digits on the other hand do have a proper lottery form.
For OP, if your place is just nearby at a lottery outlet, it's more convenient to play there instead and you are sure it's legit. You will also save some bits of your Bitcoin holdings. And since joining lotteries are not that costly, you might end up paying high transaction fees compare to the cost of your purchase slots or tickets on crypto-lottery gambling if ever.
And also, any ideas or strategy/tricks/advices to maximize profits and minimise risks by playing this kind of gamble?
No tricks. Even bankroll management won't work here.
Bet, wait for the result, that's it.
Nitrogensports offers a similar type of prediction/lottery in their blog page called
Nitro Squares where you predict the last digit of the total scores in NFL or certain events. There's free ones that you could always try out but the slots are usually filled up quickly.
Been a fan of NitroSquare during the NBA restart. Too bad that betslip is the entry regardless of the amount. I have several decent bets that time but since it's per betslip, I can only manage to pick up to 2 squares. For free ones, yes the slots are filled up quickly.